STUDY COMMITTEE B1 INSULATED CABLES 2017 -...

Action Plan SC B1 2017-2020 Last version 1/59 AG: 2018-05-01

CONSEIL INTERNATIONAL DES GRANDS RÉSEAUX ÉLECTRIQUES INTERNATIONAL COUNCIL ON LARGE ELECTRIC SYSTEMS

STUDY COMMITTEE B1

INSULATED CABLES

2017 - 2020 ACTION PLAN

MAY 2018


Table of Contents

1 FRAMEWORK .............................................................................................................................. 5

2 TECHNICAL PLAN ....................................................................................................................... 5

2.1 SC ADVISORY GROUPS .............................................................................................................. 5 2.2 SC WORKING GROUPS ............................................................................................................... 6 2.3 SC TASK FORCES .................................................................................................................... 15 2.4 INTERACTIONS WITH OTHER CIGRE COMMITTEES ..................................................................... 15 2.5 INTERACTIONS WITH OTHER ORGANIZATIONS ............................................................................. 16 2.6 SYMPOSIA AND COLLOQUIA ...................................................................................................... 16

3 ADMINISTRATIVE PLAN ........................................................................................................... 16

3.1 SC B1 MEETINGS .................................................................................................................... 17 3.2 RECORDS OF SC B1 MEETINGS ................................................................................................ 17 3.3 NEW SC B1 WGS AND TFS ...................................................................................................... 17 3.4 PROGRESS OF SC B1 WGS AND TFS ....................................................................................... 17 3.5 SC B1 PUBLICATIONS .............................................................................................................. 17 3.6 TUTORIALS............................................................................................................................... 18 3.7 SC B1 WEB SITE ..................................................................................................................... 18

APPENDIX I: ADVISORY GROUP, WORKING GROUP AND TASK FORCE FORMS (APRIL 2018) 20


............................................................................................................................................................... 20

WG N° B1.38 ......................................................................................................................................... 27


TECHNICAL ISSUES # (2):9 ................................................................................................................ 27

THE WG APPLIES TO DISTRIBUTION NETWORKS (4): YES .......................................................... 27

WG* N° B1.44 ....................................................................................................................................... 28

TECHNICAL ISSUES # (2): 9 ............................................................................................................... 28

THE WG APPLIES TO DISTRIBUTION NETWORKS: YES ............................................................... 28

TITLE OF THE GROUP: GUIDELINES FOR SAFE WORK ON CABLE SYSTEMS UNDER INDUCED

VOLTAGES OR CURRENTS ................................................................................................................ 28

3.8 TERMS OF REFERENCE: ........................................................................................................... 40


1 FRAMEWORK

The purpose of the three years Action Plan is to outline the main technical and administrative activities that SC B1 expects to carry out in the specified time frame of 2017 through 2020.

It takes into consideration the TC Action Plan as well as the SC B1 2016-2026 Strategic Plan, with which it is in line, as well as specific proposals put forward by Members during Study Committee meetings.

2 TECHNICAL PLAN

This part of the Action Plan summarizes the technical activities, which are currently in progress (N.B. new technical activities consistent with the SC B1 Strategic Plan may be initiated during the validity period of this Action Plan). The terms of reference of SC B1 AGs, WGs (all duly approved by TC Chairman) and

TFs can be found in Appendix I. A one page chart showing all the CIGRE WGs, JWGs, TFs and JTFs in which SC B1 is currently involved is also provided.

2.1 SC Advisory Groups SC B1 had four installed Advisory Groups (AGs), to deal with strategically important work. They were disbanded in 2016 following a Technical Committee decision which considers that AGs are disbanded at the end of the term of office of the outgoing Chairman. Three Advisory Groups were re-installed by the incoming Chairman who modified, in collaboration with their conveners, the terms of reference of the SAG, CAG and TAG.

- The SC B1 Strategic Advisory Group SAG under the Convenership of the Chairman is an AG with the task to analyse items of fundamental importance and to support the Chairman with preparing strategic decisions. The SAG typically meets once a year.

- The SC B1 Customer Advisory Group CAG is an AG with the task to ensure that the needs of the Target Groups are addressed within the work of SC B1. It will co-ordinate all activities in this field and work in close contact with the SC Chairman and the Strategic Advisory Group B1-SAG. The CAG will present its results and recommendations prior to any external action to the B1-SAG, for approval. The Convener of the CAG is also a member of the SAG.

- The SC B1 Tutorial Advisory Group TAG is an AG with the Scope to implement SC B1’s high ambitions for education, continuous training, tutorials and publications. The B1-TAG will be the working body within SC B1 to co-ordinate all activities in this field. It will work in close contact with the SC Chairman, the Strategic Advisory Group B1-SAG and the Customer Advisory Group B1-CAG. It will involve all SC B1 Members and Conveners as contacts. The Convener of the TAG is also a member of the SAG.


2.2 SC Working Groups

SC B1 disbanded two WGs in 2017 after their work was published:

• WG B1.39: Onshore generation cable connections

• WG B1.47: Implementation of Long AC HV & EHV Cable Systems

SC B1 will also disband four WGs in 2018 after the finalization of their tutorials:

• WG B1.36: Life cycle assessment and environmental impact of underground cable systems

• WG B1.41: Long Term Performance of Soil and Backfill Systems

• WG B1.51: Fire issues for insulated cable installed in air

• WG B1.55: Recommendations for additional testing for submarine cables from 6 kV (Um = 7.2 kV) up to 60 kV (Um = 72.5 kV)

At the end of April 2018, SC B1 has now 4 WGs finalizing their work and 15 WGs

and 1 JWG in progress: WG finalizing their work:

• WG B1.28: On site Partial Discharges Assessment WG B1.28 was set up in 2008 with Nigel Hampton (US) as Convener and is due to present its final report in 2011. Due to availability problems, it was decided in accordance with Nigel Hampton to change the Convener to Mark Fenger (CA). The last comments from the SC has been received. The final document is under review by the Strategic Advisory Group and will be sent very soon to the Central Office. The final report will be delivered in 2018.

• WG B1.45: Thermal monitoring of cable circuits and grid operators’ use of dynamic rating systems

Nowadays, due to a more variable situation and increasing loads in the power grids, a dynamic rating system and other measurement values aid the asset manager in making optimal decisions in planning investments in the High Voltage grid. Based on measurement a grid operator can on the one hand decide if a hotspot in network should be taken away to increase the capacity or if the hotspot should be managed with the dynamic rating system and on the other hand will know the load and overload possibilities in real time and for the coming hours. WG B1.45 was set up in 2013 to study this specific topic with Blandine Hennuy (BE) as Convener. The final draft of the TB has been circulated among SC members. The WG is finalizing the document. The publication on eCigre is therefore expected for 2018.

• WG B1.46: Conductor Connectors: Mechanical and Electrical Tests Current IEC 61238-1 standard applies to connectors for medium voltage cables. There is no IEC standard for connectors for HV cables. The procedures from IEC 61238-1 along with manufacturer and user specifications have been used to type test HV cable connectors. The thermal, mechanical and resistance stability tests specified in current standard are applicable to HV


but some requirements are specific to high voltage applications. These include dimensional and functional requirements of connectors within HV cable accessories, typically larger cable sizes, versatility of the conductor constructions as well as different circuit load patterns, short circuit levels and mechanical stresses due to tensile and thrust loads. The IEC WG16 of the TC20 commenced work on revision of current IEC61238-1 standard. During this work, some members of WG16, expressed interest that the scope of this standard is extended to high voltage cable application. The TF in charge of the revision believes this work needs to be done by a dedicated group of high voltage experts. At the Study Committee B1 meeting held in Paris on August 28 and 29 2012 it was agreed that a task force be established to consider if further guidance was needed on the testing of connectors for HV cable accessories. It was also decided during the meeting that the topics should be expended to cover mechanical loads, (not only thermal), to include all connectors (mechanical and other types) and to include termination and joints connectors. WG B1.46 was set up in 2013 to study this specific topic with Milan Uzelac (US) as Convener. The report has been circulated among SC members. Comments have been received. The final TB is expected for the end of 2018.

• WG B1.52: Fault location on land and submarine links (AC and DC)

The increasing number of land and submarine cable assets globally has created a focus on cable fault location capabilities. All faults in cable systems are different and cable fault location depends to a great extent on applying the appropriate technique or combination of techniques. The methods for locating power cable faults require competent engineers and service providers. Guidance is therefore required for engineers on the correct application of the various techniques available.

WG B1.52 was set up in 2014 to study this specific topic with Robert Donaghy (IE) as Convener and the final report is expected for May 2018.

JWG and WGs in progress

• WG B1.38: After laying tests on AC and DC cable systems with new techniques.

Extruded insulation is rapidly becoming the insulation of choice in both new and replacement transmission class cable circuits. While the cable and accessories are tested in the factory, the workmanship to install the accessories can only be tested after the installation has been completed and before the cable system is put into service. As DC testing, commonly used for FF cables, is not efficient for XLPE cables for AC transmission systems, attention has to be focussed on AC testing methods. The testing of DC cable systems will also be addressed to define which technology is the most appropriate. In the past, test equipment capable of testing long lengths of cables were not available so that a soak test at operating voltage for 24 hours was carried out by connecting the cable to the power system. In the last ten years different power sources have been developed that have the power rating to test long cable lengths. These include AC resonant power supplies, damped AC (DAC) and, more recently, very low frequency (VLF). In addition, there have been significant improvements in diagnostic tools such as off-line PD and


dissipation factor measurement to assess the condition of a cable system. However, as there are presently only withstand test levels given in IEC 60840 and 62067 for AC resonant test voltages, there is a need to establish test voltage levels for other voltage sources and also establish suitable diagnostic tests. WG B1.38 was set up in 2011 to study this specific topic with Mark Fenger (CA) as Convener and the final report has to be made available for final review in 2018.

• WG B1.44: Guidelines for safe work on cable systems under induced voltages or currents

During several phases of a cable system life (installation/maintenance/testing/ upgrading/removal), it can be necessary to work under induced voltages or induced currents:

- During the pulling or the laying of a cable in the vicinity of an energized system:

- underground cable or overhead line - During the jointing operations in the installation process - When checking or maintaining link boxes - During the repair of the cable after fault - When removing the cable for disposal at the end of its life.

WG B1.44 was directly set up in 2012 to study this specific topic with Caroline Bradley (GB) as Convener. Unfortunately due to a change in job and personal circumstances the convener could no longer continue in her role as convener and she has been replaced in 2016 by Unnur Stella Gudmundsdottir (DK). The work was on hold from mid-2015 until April 2016 due to a change of convenorship and the unavailability of members. The progress is relatively good. The report to be circulated among SC members is expected for August 2018.

• WG B1.48: Trenchless technologies for Underground Cables In October 2001 Technical Brochure 194 was published, describing “Construction, laying and installation techniques for extruded and self-contained fluid filled cable systems”. The Technical Brochure included a brief description of innovative techniques including horizontal drilling, pipe jacking and micro-tunneling. TB 194 describes the techniques, their limitations and the changes in cable design necessary to make use of each technique (for example, the changes needed in order to match the ampacity of a shallow, direct buried installation). Although much of the information on trenchless cable installation in TB 194 is still valid, it is relatively brief and few practical examples are given. There is increasing pressure to underground transmission circuits and it is becoming more common for a length of underground cable to be introduced into an overhead line circuit. There is also increasing pressure to reduce the cost of undergrounding and reduce the disruption (e.g. to traffic flow) caused when underground circuits are installed. A number of significant technical changes to underground cable circuits have been seen since TB 194 was written; for example, extruded cable has almost completely superseded fluid filled cable for new installations, delivery lengths for land cable have increased and there is a trend towards larger conductor sizes.


There has been a large increase in the use of cable in sensitive habitats (e.g. shore landings for AC cable from offshore wind farms and DC cable interconnectors). In some cases the landing sites of submarine cables have been contaminated by prior use. Trenchless technologies do not disturb such sensitive areas and have been used in these applications. In addition to changes in cable technology and attitudes to undergrounding, there have been technical advances in the methods used for trenchless installation since TB 194 was written. WG B1.48 was set up in 2013 to study this specific topic with Eugene Bergin (IE) as Convener and the report to be circulated among SC members is expected for August 2018.

• JWG B1/B3.49: Standard design of a common, dry type plug-in interface for GIS and power cables up to 145 kV

Taking into account the market trend in some countries towards a commoditization of the High Voltage cables lower or equal to 145kV, the working group B1-B3.33 had concluded that there is room in these voltage levels for a standard design in parallel with the present designs. During the first meeting of the JWG, the WG made a detailed reading of the TOR and some modifications were suggested. These amendments are fully in line with the spirit of the TOR that already was signed. They are included in the TOR which can be found in Appendix I. JWG B1/B3.49 was set up in 2013 to study this specific topic with Pierre Mirebeau (FR) as Convener and the final report is expected for 2019.

• WG B1.50: SVL and bonding systems (design, testing, operation and monitoring)

The basic information needed to design a bonding system is included in several documents such as Electra 128-1990, TB 283-2005, and TB 347-2008. Some of these documents need to be updated. In addition it is noted that cable bonding components and related national regulations have changed in recent years. The WG plans to address related issues with sheath voltage limiters (SVLs) and bonding systems. WG B1.50 was set up in 2014 to study this specific topic with Tiebin Zhao (US) as Convener and the final report is expected for 2018.

• WG B1.54: Behavior of cable systems under large disturbances (earthquake, storm, flood, fire, landslide, climate change)

This topic is extremely important since in the recent past several large disturbances occurred in various countries. Everybody remembers for example the earthquakes in Nepal this year and Christchurch, New Zealand in 2010. More than 500 cable faults requiring repair were counted in Christchurch. In the closing session of the Auckland Symposium, in September 2013, the General Report outlined the need of further work in this area regarding cable design and/or installation design for seismic areas. The Scope of Work will document the resultant damage, required repairs, recommend improved accessory and cable designs and suggest alternate


installation methods for LV, MV, HV and EHV cable systems due to the occurrence of major disturbances. Major disturbances include the following events:

- Floods, fire and global warming, - Major earthquakes, liquefaction and resultant landslide or tsunami, - Hurricanes, cyclones, tornadoes, typhoons, - Ice storms, windstorms and mud and/or landslides.

WG B1.54 was set up in 2015 to study this specific topic with Harry Orton (CA) as Convener and the final report is expected for the end of 2018.

• WG B1.56: Cable rating verification

WG B1.35 drafted a guide for rating calculations of insulated cables. One of the issues considered in that guide was the use of calculation tools. It was recommended by the WG that the user should verify the calculations of the tool before using it. Despite some tools being used frequently, and by multiple companies, it is generally unclear exactly how a calculation is performed by the calculation tool. Given the many different installation situations and cable designs which exist, and for which a strict IEC based calculation is not even possible (refer to the many examples in the technical brochure of WG B1.35), the user should verify how the situation is treated by the calculation tool. The assumptions made and the formulae used must be applicable, but these are not gathered in any standard. For dynamic or transient ratings, verification becomes even more important as the dynamic behaviour significantly complicates the models and their output. As it is rather difficult to verify calculations of calculation tools, especially when these tools provide transient or dynamic ratings, or real life situations which are not precisely covered by IEC, it is currently proposed to help the cable community by setting up a uniform calculation verification protocol, which can be used to ensure a correctly working software within a certain (limited) domain. WG B1.56 was set up in 2015 to study this specific topic with Frank de Wild (NL) as Convener and the final report is expected for August 2018.

• WG B1.57: Update of service experience of HV underground and submarine cable systems

In recent years, significant quantities of land and submarine cables and accessories have been installed and the associated technology and laying techniques have matured and evolved. With the increasing demands on electrical power transmission and distribution systems, including the need to connect new (renewable) sources of generation, significant quantities of land and submarine cable are currently being installed. In 2009, CIGRE WG B1.10 published a Technical Brochure (TB 379) which collated survey data relating to the installed quantities of underground and submarine cable systems rated at 60 kV and above together with the service experience/performance of existing underground and submarine cable systems. The survey covered a 5 year period ending December 2005 for land cables and a 15 year period ending December 2005 for submarine cables. Our stakeholders have expressed the need to have these data updated. The WG Convener should consider setting up separate Task Forces to consider independently the statistics for land, submarine cable and DC


systems. This would enable results for each type of cable to be reported as soon as data are available rather than wait for all work to be completed. WG B1.57 was set up in 2015 to study this specific topic with Soren Mikkelsen (DK) as Convener and the final report is expected for 2019.

• WG B1.58: Asset Management in MV Cables Networks

MV power cable network are one of the most important parts of distribution power systems. The oldest parts of cable networks consist of belted paper insulation lead covered (PILC) cables and Polyethylene (PE) insulated cables. Since the 1970’s, cross linked polyethylene (XLPE) insulated cables have supplanted the older designs. MV cable networks are increasingly complex systems of interconnected cables that are regularly modified. As a result, cable circuits often consist of a range of cable, joint and termination designs. Consequently, the active aging processes exhibited by individual cable sections and accessories may be at different stages. To effectively manage the cable network, a detailed knowledge of the technical condition of individual circuit elements (cable segments, joints, terminations) is necessary. In addition to the understanding of the current network condition, effective methods to quality-assess both installation and repair works to cable circuits is required as this has been identified as a significant threat to the health of modern distribution networks. Many novel diagnostic methods have been proposed for MV cable systems over the last few decades. They are being used increasingly in MV cable network. Modern systems allow network operators to record and analyze measurements in the field. The new diagnostic methods can be a source of information about the condition of all cable network elements and provide better information about condition of cable circuits after installation. This information is very important to the development of asset management this part of network. Two of the primary measurement techniques are partial discharge (PD) and tan delta. Both of these techniques generate information about the technical condition of insulation. PD analysis facilitates the ability to measure parameters from individual sections of both cables and accessories. A number of individual distribution companies have gained sufficient practical knowledge to effectively use these diagnostic results to inform maintenance and operational decisions. WG B1.58 was set up in 2016 to study this specific topic with Sławomir Noske (PL) as Convener. Due to many changes in his company and due to the adaptation of the policy on employee participation in technical organizations, the convener, he reported to SC B1 his resignation as convener of the WG B1.58. A new convener, Detlef Wald (CH), has been appointed in October 2017.

• WG B1.60: Maintenance of HV Cable Systems During the 71st CIGRE SC B1 meeting held in Kristiansand (Norway) in 2015 it was decided to set up a TF on the topic: “To update TB 279 Maintenance for HV cables and Accessories, with the request to advise if it is feasible or not to set up a WG on the subject. The TF concludes that there is a clear need for a WG to update TB 279, actively dealing with the following items :


o To collect feedback from utilities on the present situation and future needs by circulating a questionnaire to utilities

o To make the present TB 279 more complete by including AC submarine cables and DC cables

o To describe modern methods for condition based maintenance and to pay attention to new developments

o To focus on practical cases of maintenance o To consider the position of Fluid Filled (FF) cables and their

increasing need for maintenance o To include aspects of maintenance cost

WG B1.60 was set up in 2016 to study this specific topic with Bart Mampaey (BE) as Convener and is due to present its final report in 2019.

• WG B1.61: Installation of HV Cable Systems The SC B1 has recommended to update the Technical Brochure 194 “Construction, Laying and Installation Techniques for Extruded and Self-contained Fluid Filled Cable Systems” from 2001. The existing TB 194 has the following Chapters: 1) Introduction 2) Description of the Cable System 3) Construction Techniques 4) Cable Installation Design and Laying Techniques 5) External Aspects 6) Design of a Link 7) Glossary 8) Bibliography The revisions to TB194 should also take the following recent CIGRE SC B1 work, if applicable, into account:

o TB 640 Guide for Rating of High Voltage Cables – in this TB the main installation configurations have been described

o The work of WG B1.48 on Trenchless Technology, will be completed soon

o The work of WG B1.41 on Long Term Performance of Soil and Backfill for Cable Systems is also close to completion

o The work of WG B1-34 on Mechanical Forces in Large Cross Section Cable Systems has identified some areas where TB 194 should be updated

o The work of TF B1-53 on Installation Related Cable Damages suggested that including information regarding the following topics:

• How to co-ordinate cable design, engineering and installation given project interfaces between different companies

• Add best practices and practical examples to the installation guidelines

• Add examples of cable damage related to installation errors.

Some new cable constructions are being introduced in some countries and these should be considered. WG B1.61 was set up in 2016 to study this specific topic with Eugene Bergin (IE) as Convener.


The progress has been slow. The reason for this delay is because they are awaiting the output from the following work:

• WG B1.48 on Trenchless Technology • WG B1.41 on Long Term Performance of Soil and Backfill for Cable

Systems Therefore the WG expects to start in 2018.

• WG B1.62: Recommendations for testing DC extruded cable systems for power transmission at a rated voltage up to and including 800 kV

The big demand for transmission of high electrical power in long distances has fostered the fast and successful development, in recent years, of extruded insulation technologies HVDC Transmission Systems at increasing current and voltage levels; in fact, both traditional and newer technologies are evolving. Extruded 320 kV DC cable systems have been developed, qualified and installed in numerous cases and the way to increase voltage levels and conductor sizes looks to be still evolving. The majority of the HVDC extruded systems qualified and installed, today are based on XLPE technology. However other extruded technologies, using either uncross linked or partially cross-linked materials, have been introduced and in some case installed. For these reasons, the new Technical guidelines should take into consideration all the different technologies. Furthermore, important technological milestones in the field of extruded dielectrics have been achieved when the feasibility has been demonstrated, according to CIGRE TB 496 scope of test, for extruded cable systems operating at voltages much higher than 500 kV though Current TB 496, even if rather recent (April 2012), is only covering rated voltages up to 500 kV. In the field of laminated insulation cable systems, recent progresses achieved indicate the availability of higher than 500 kV PPL and Mass Impregnated paper insulated HVDC cable systems. These systems are generally tested according to the Technical Report published in Electra 189 (April 2000) and a following Addendum (Electra 218, Feb 2005), covering rated voltages up to 800 kV. In this scenario, it is relevant that CIGRE undertakes works leading to, at least, clear guidelines to specify appropriately extruded cable systems dedicated to voltage higher than 500 kV. It was decided by SC B1 to include in the scope of work of WG B1.62 solid insulated cable systems for the voltage class up to, and including, 800 kV. As the new guidelines for extruded cable systems could change some test methods (e.g.: impulse superimposed onto HVDC) SC B1 decided to launch in parallel a WG for laminated cable systems to introduce the same methods, if appropriate, and revise ELECTRA 189 if needed. In this way same tests specified in different guidelines will have same test methods. The resulting recommendations should help manufacturers, installers and users to design, test and operate the whole cable system. WG B1.62 was set up in 2017 to study this specific topic with Stefano Franchi Bononi (IT) as Convener.

• WG B1.63: Additional recommendations for mechanical testing of submarine cables for dynamic applications

There is a need to develop an international standard for HV dynamic cables systems used to connect floating wind farms and tidal and wave converters to


the grid. The existing standards for the design of Oil and Gas umbilical cable systems under mechanical fatigue (ISO 13628-5 and DNV-RP-F401) provide a good basis for specifying MV and HV dynamic cables but they do address all topics adequately. Electrical and thermo-mechanical aspects, and the specificities of floating wind turbines must be considered in addition to mechanical aspects. Recently, two CIGRE TBs have included dynamic cables in their scope of work: a chapter of CIGRE TB610 deals with generalities of dynamic cable design, and chapters of CIGRE TB623 deal with fatigue analysis and recommendations for dynamic cable type-testing, although many parameters remain to be discussed and defined. The role of this new CIGRE WG is to develop common and clear guidelines for mechanical test of the whole system (equipment and installation) upon project characteristics (external constraints, life duration expected, safety factor, etc.). WG B1.63 was set up in 2017 to study this specific topic with Emmanuelle Laure (FR) as Convener.

• WG B1.64: Evaluation of losses in armoured three core power cables Several publications have highlighted that IEC 60287 may overestimate the losses of three core armoured power cables. The current IEC 60287 standard is based on semi empirical work on smaller conductor cross sections with common sheath and therefore does not fully address the current design trend of the cables. The increasing number of offshore installations with larger conductors and higher voltages makes it important to calculate losses more accurately in order to provide cost optimized solutions. Overestimation of armour losses may lead to larger conductor sizes and over dimensioning of the cables which leads to increased cost of manufacturing and installation (overall project cost). A standardized method of loss measurement is important due to the increase in numbers of measurements as verifications of non-IEC rating. New analytical formulae based on physical models are required. Computational tools and advancements in computer science enable new evaluation methods to be utilized and these can be used in support of rating calculations and loss measurements. WG B1.64 was set up in 2017 to study this specific topic with Ronny Stolan (NO) as Convener.

• WG B1.66: Recommendations for testing DC lapped cable systems for power transmission at a rated voltage up to and including 800 kV

The demand for transmission of large amounts of electrical power over long distances has increased the use of DC cables. DC cables with insulation system with lapped paper or polypropylene laminated paper have been used for several decades and these cable systems have proven to have excellent reliability. DC cables with extruded insulation materials were introduced to the market 15-20 years ago and have taken over most of the market for cable systems up to 300-400 kV. The technology for extruded DC cable systems is under constant development and the voltage level for extruded systems is expected to increase in the coming years. However, DC cables with lapped insulation are currently used for the highest voltage levels and will probably


still be used for some of the largest transmission links in the coming years, especially long submarine transmission links. HVDC cable systems with lapped insulation are, in most cases, qualified and tested according to the guidelines from Cigre published in Electra No. 189 in year 2000 – “Recommendations for tests of power transmission DC cables for a rated voltage up to 800 kV”. This recommendation was later supported by the addendum published in Electra 218 in 2005. The existing test recommendations do not consider the new development in converter technology as they were prepared before voltage source converters became generally available to the market. Voltage source converters are now in operation with lapped cable systems at levels above 500kV and there is a need to review the test recommendations in light of the new developments. The recommendations in Electra No. 189 and 218 should also be combined into an updated technical brochure to make the content easily available to target groups. It is therefore proposed to establish a working group to review the existing test recommendation, including the addendum, for lapped HVDC cables up to 800 kV. The work will be performed in parallel to WG B1.62, which will prepare an extension of the test recommendations for solid insulated cable systems up to 800 kV, in order to harmonize test requirements if applicable. The updated technical brochure will assist target groups with guidelines to qualify and test lapped DC cable systems. WG B1.66 was set up in 2017 to study this specific topic with Gunnar Evenset (NO) as Convener.

2.3 SC Task Forces

SC B1 currently has five TFs whose task is to define the terms of reference of potential new WGs. Their reports are due for the next meeting of SC B1 in October 2017 for decision for future work.

• TF B1.65: Installation of offshore Cable Systems with Soren Krüger Olsen (DK) as Convener

• TF B1.67: Loading pattern on cables connected to windfarms with Volker Werle (DE) as Convener

• TF B1.68: Update of TB 358 with Jacco Smit (NL) as Convener

• TF B1.69: Revision of TB 189 with Thinus Du Plessis (ZA) as Convener

• TF B1.70: Fiber optic elements embedded in power cables with Roman Svoma (GB) as Convener.

2.4 Interactions with other CIGRE Committees

• Relations with interfacing Study Committees SC B1 strives to have good cooperative spirit with the neighbouring SCs, and to set up JWGs whenever dealing with technical issues interfacing with cables, or other technical topics with mutual interest. The committees with the more traditional interfaces are B2, B3 and D1, but B4, C3, C4, C6 are also important partners. SAG members have to liaise and to disseminate the information and collect the needs of the other SCs or organization.


SC B2 C. Jensen SC C6 T. Du Plessis

SC B3 E. Bergin SC D1 W. Boone

SC B4 S. Swingler AORC K. Barber/H. Tanaka

SC C3 E. Bergin ICC W. Zenger

SC C4 T. Du Plessis IEC P. Mirebeau

Jicable P. Argaut

• Relations with AORC and other Regional Forum SC B1 strives to actively take part in AORC meetings. These are seen as alternatives for Asian and Pacific B1 members not being able to attend the meetings more far away. SC B1 have the same policy when other similar regional meetings are arranged.

2.5 Interactions with other Organizations

After due considerations, SC B1 is open to interact with any other organisation in the field of insulated cable when this is beneficial to both parties. In the future, this will be evaluated before any decision is drawn on similar interactions.

• Interactions between CIGRE SC B1 and IEEE/PES Insulated Conductors

Committee ICC A permanent JTF SC B1/ICC is operational with Walter Zenger (US) as Convener. Moreover, a much appreciated Joint Discussion Group was launched by ICC and SC B1 regularly contributes. B1 will strive to maintain the good relation with ICC, to get a vital and natural link to the North American cable society.

• Interactions between CIGRE SC B1 and IEC TC20 The relations between the two Committees are mainly informal, but are also very intensive. The Chairmen (or as appointed) are invited to the other’s annual meetings. Specific cooperation (on coming test standards) is desirable. In this prospect, a member of SAG (Pierre Mirebeau) is acting as liaison officer. In some cases, IEC TC 20 is asking for some work to help them in the elaboration of new or revised standards.

• Relations between CIGRE SC B1 and CIRED SC B1 will analyse its field of activity with regard to issues which might be of common interest with CIRED and will communicate with CIRED about mutual information, coordination and possible cooperation whenever deemed appropriate. The TOR of WG approved by the TC Chairman mention if the work is relevant for MV or LV cable systems.

2.6 Symposia and Colloquia SC B1 plans to participate in joint Symposia and Colloquia wherever appropriate. Participations are already scheduled in 2018 and 2019.

3 ADMINISTRATIVE PLAN

This part of the Action Plan summarizes the main administrative actions envisaged by SC B1. Said actions are essentially aimed at securing a wider participation in the SC, increasing its operational efficiency and enhancing the visibility of its activities.


3.1 SC B1 Meetings

In uneven years, all Members are asked to prepare brief presentations of the main events, which had occurred during the past two years in their respective countries in the field of insulated power cable systems. In addition, Members shall identify the main target groups in their countries and consider means how to approach them for mapping their needs and degree of satisfaction with our work. SC Members shall function as interfaces to their local target groups.

3.2 Records of SC B1 Meetings The Decision List of SC Meetings is a very positive action oriented tool. It is issued immediately after the Meetings (within one week).

The Official Minutes of SC Meetings remain however important for record purposes. Their publication takes place no later than two months after the Meetings.

3.3 New SC B1 WGs and TFs The "starting transient" of new WGs and TFs will continuously be emphasized. Most technical activities of WG or TF shall start no later than three to four months after said WG or TF have been set up. Members, who indicated during SC B1 meetings that experts from their respective countries will participate in a new WG or TF, have been advised that the associated nomination must be finalized and communicated directly to the relevant Convener, with copies to the Chairman and Secretary, within a maximum of three months. This aspect will be followed up closely in the future, too. National members are asked to be attentive to the appointment of WG experts (competence, active participation, organization of meetings). No marketing will be tolerated. It is planned to ask that all members of WGs sign a paper in which they undertake not to make attempts for commercialisation.

3.4 Progress of SC B1 WGs and TFs Conveners are asked halfway between SC B1 Annual Meetings to provide a short formal update on the progress of their respective WGs and TFs (one page report to be sent to the Chairman and the Secretary by the end of February of each year). It was recently noticed that some WGs did not honour the deadline which was given in the ToRs. SC B1 will concentrate its efforts on producing their reports within the specified deadlines.

3.5 SC B1 Publications Efforts to eliminate delay with publications as experienced in previous years were successful. Conveners have been reminded that the final reports of their respective WGs should be "publication ready" when they are submitted to the Chairman and to SC Members, respectively, for final approval. Good progress was achieved by small editorial teams, which, based on comments of SC members, prepared the final versions of the respective documents for publication in ELECTRA or as Technical Brochures: Four publications were made in 2017:

• WG B1.34: Mechanical forces in large cross section cable systems (executive summary in Electra 290 and Technical Brochure 669).


• WG B1.47: Implementation of Long AC HV & EHV Cable Systems (executive summary in Electra 291 and Technical Brochure 680).

• WG B1.36: Life Cycle Assessment and Environmental Impact of Underground Cable Systems (executive summary in Electra 292 and Technical Brochure 689).

• WG B1.41: Long Term Performance of Soil and Backfill Systems (executive summary in Electra 296 and Technical Brochure 714)

And already two publications in 2018:

• WG B1.51: Fire issues for insulated cable installed in air (executive summary in Electra 297 and Technical Brochure 720).

• WG B1.55: Recommendations for additional testing for submarine cables from 6 kV (Um = 7.2 kV) up to 60 kV (Um = 72.5 kV) (executive summary in Electra 298 and Technical Brochure 722).

Seven publications will due to be presented in 2018 / 2019: 2018

• WG B1.28: On site Partial Discharges Assessment of HV and EHV cable systems

• WG B1.45: Thermal monitoring of cable circuits and grid operators’ use of dynamic rating systems

• WG B1.46: Conductor Connectors: Mechanical and Electrical Test

• WG B1.52: Fault location on land and submarine links (AC and DC)

2019

• WG B1.44: Guidelines for safe work on cable systems under induced voltages or currents

• WG B1.48: Trenchless technologies for Underground Cables

• WG B1.56: Cable rating verification In connection with the central office, SC B1 will carefully follow the publication process. This is of the highest importance for the earliest dissemination of information.

3.6 Tutorials Each WG closing should also prepare a tutorial. This has worked very well, and SC B1 now keeps quite an extensive library of prepared tutorials, available for all SC members to use when- and wherever appropriate.

3.7 SC B1 Web site

SC B1 created a Web site www.cigre-b1.org hosted by the Central Office in August 2000 and the Secretary was initially nominated as Web Master. A new design of SC B1 web site had been on line since June 15, 2005 and was regularly updated. This web site has become a very important tool in recent years. It is more and more visited and regularly updated. At mid 2012, the web-site has been upgraded to a new one. All the content of the current SCB1 web site was moved successfully to the new one. Some new tools prepared by the CAG have been uploaded at mid-2013. In 2016 a new webmaster has been appointed (Gabriel de Robien from France). In 2016 also a new Cigre Knowledge Management System (KMS) has been introduced with especially collaborative tools (private area of SC websites).


Web site will remain for the public while working files and private area will be managed with the new Cigre KMS. Existing web site : http://b1.cigre.org New collaborative tool : http://cigregroups.org.

http://b1.cigre.org/

http://cigregroups.org/


APPENDIX I: Advisory Group, Working Group and Task Force Forms (April 2018)

Strategic Advisory Group : M. Marellli (IT) WG B1.28 On site Partial Discharges Assessment

Mark Fenger (CA) / 2008-2011

WG B1.44 Guidelines for safe work on cable systems

under induced voltages or currents Stella Gudmundsdottir (DK) / 2012-2015

WG B1.50 SVL and bonding systems (design, testing,

operation and monitoring) Tiebin Zhao (US) / 2014-2017

Chairman : Marco Marelli (IT) Secretary : Alain Gille (BE)

CIGRE SC B1

JWG B1/B3.49 Standard design of a common, dry type

plug-in interface for GIS and power cables up to 145 kV

Pierre Mirebeau (FR) / 2013-2016

WG B1.45 Thermal monitoring of cable circuits and grid

operators’ use of dynamic rating systems Blandine Hennuy (BE) / 2013-2016

Tutorial and Publication Advisory Group:

G. Clasen (NL)

WG B1.46 Conductor connectors: mechanical and

electrical test Milan Uzelac (US) / 2013-2016

WG B1.48 Trenchless technologies

Eugene Bergin (IE) / 2013-2016

WG B1.52 Fault location on land and submarine links

(AC and DC) Robert Donaghy (IE) / 2014-2017

WG B1.62 Updating of TBs for EHVDC and UHVDC

Cables Systems Stefano Franchi Bononi (IT) / 2017- 2020

WG B1.56 Cable ratings verification

Frank de Wild (NL) / 2015-2017

Customer Advisory Group : E. Bergin (IE)

WG B1.38 After laying tests on AC and DC cable

systems with new techniques Mark Fenger / 2012-2015

WG B1.54 Behavior of cable systems under large

disturbances (earthquake, storm, flood, fire, landslide, climate change)

Harry Orton (CA) / 2014-2015

WG B1.57 Update of service experience of HV

underground and submarine cable systems Soren Mikkelsen (DK) / 2015-2018

WG B1.60 Maintenance of HV cable systems Bart Mampaey (BE) / 2016-2019

WG B1.61 Installation of HV cable systems Eugene Bergin (IE) / 2016-2019

WG B1.63 Additional recommendations for mechanical

testing of submarine cables for dynamic applications

Emmanuelle Laure (FR) / 2017-2020

WG B1.64 Evaluation of losses in armoured three core

power cables Ronny Stolan (NO) / 2017-2020

WG B1.66

Recommendations for testing DC lapped cable systems for power transmission at a rated voltage up to and including 800 kV

Gunnar Evenset (NO) / 2017-2020

TF B1.67 Loading pattern on cables connected to

windfarms Volker Werle (DE) / 2017-2018

TF B1.65 Installation of offshore Cable Systems Soren Krüger Olsen (DK) / 2016-2018

TF B1.68 Update of TB 358

Jacco Smit (NL) / 2017-2018

TF B1.69 Revision of TB 189

Thinus Du Plessis (ZA) / 2017-2018

WG B1.58 Asset Management in MV cable network

Detlef Wald (CH) / 2016-2019

JTF SC B1/ICC Interactions CIGRE SC B1 & IEEE/PES

Walter Zenger (US) / Permanent

TF B1.70 Fiber optic elements embedded in power

cables Roman Svoma (GB) / 2017-2018


Study Committee No: B1

ADVISORY BODY FORM

AG: B1.SAG Name of Convenor: Marco Marelli (Italy)

E-mail address: [email protected]

Title of the Group: B1-Strategic Advisory Group

Scope, deliverables and time schedule of the Group

Background:

Advisory Groups are foreseen within Study Committee B1 Strategic Plan to support the activity of the SC by making recommendations in various fields. The Strategic Advisory Group (SAG) is set to steer the actions of the Study Committee and it works with input and the full support of CAG and TAG

Scope:

A Strategic Advisory Group (SAG) is set up, which terms of reference are primarily to

• Assist the Chairperson in the definition of the strategic directions that should be followed by SC B1, in compliance with the Technical Directions adopted by the CIGRE Technical Council.

• Launch or propose launching, whenever appropriate, new TFs or WGs

• Consider, if needed, the establishment of other specialized Advisory Groups and decide about the use of their outcomes

The SAG is composed of a limited number of members: the SC Chairperson, who will convene, the SC Secretary, and a few other SC Members or experts, all chosen by the Chairman. The Conveners of the other SC B1 Advisory Groups are permanent members of the SAG. The SAG will meet at least once a year, but will communicate as required.

Time Schedule: Permanent during the term of SC B1 chairperson

Approval by SC B1 Chairman:

Date: 23/07/2017



ADVISORY BODY FORM

AG: B1.CAG

Name of Convenor: Eugene Bergin (Ireland)

E-mail address: [email protected] or [email protected]

Title of the Group: B1- Customer Advisory Group


Background:

Advisory Groups are foreseen within Study Committee B1 Strategic Plan to support the activity of the SC by making recommendations in various fields. The Customer Advisory Group (CAG) is set to listen and collect information from stakeholders

Scope:

A permanent Customer Advisory Group is installed in SC B1 with the Scope to materialise CIGRE TC’s suggestion, that “Study Committees have to ensure that the needs of their Target Groups are fulfilled.” The B1.CAG will be the working body within SC B1 to co-ordinate all activities in this field. It will work in close contact with the SC Chairperson and the Strategic Advisory Group B1.SAG. All SC B1 members will act as contacts and interfaces to their national or local customers. The Terms of Reference of the B1.CAG are as follows:

• To find out what areas of cables in the High Voltage Transmission industry, which includes utilities, manufacturers, installation contractors, consultants, researchers and academia, wish to have studied by Cigre SC B1. This will be done e.g. by issuing a Questionnaire at the SCB1 Open Session at Paris Conference every two years. Every attempt will be made to get the attendees to fill out and return the Questionnaire in order that we can check what they want to be studied.

• In completing the above. B1.CAG will also aim to try and look some distance into the future with respect to the developing needs.

• To collate the published SC B1 information (Technical Brochures, Electra articles, Tutorials, and Session Papers), IEC Specifications on High Voltage Cables and CIGRE Papers delivered at Jicable. This collation will be done under different category headings so that those who are interested in any area to do with High Voltage cables can easily find the relevant information. The category heading will include testing, accessories, installation, environmental, HVDC, XLPE cables, laminated cables, submarine cables, etc. So, with this collation it is possible to find all Cigre and IEC documents, which are relevant to a heading and this will be a very useful library of information on that subject.

Deliverables and Membership:

B1.CAG will report regularly to the SC, at least twice a year, or additionally, whenever appropriate.

mailto:[email protected]



B1.CAG will present the results of the responses to the Paris Questionnaire to the Strategic Advisory Group (SAG). The SAG will consider if the work suggested in these responses has

• already been dealt with by SC B1 in previous Working Groups

• should lead to an amendment of the work of existing Working Groups

• should be considered for the launching of new Working Groups

Members are selected by the Convener and should possibly represent the variety of affiliation and geographical distribution of B1 stakeholders.

The Convener of B1.CAG is a permanent member of the B1.SAG.



Date: 23/07/2017



ADVISORY BODY FORM

AG: B1.TAG Name of Convenor: Geir Clasen (Norway)


Title of the Group: B1 Tutorial Advisory Group


Background:

Advisory Groups are foreseen within Study Committee B1 Strategic Plan to support the activity of the SC by making recommendations in various fields. The Tutorial Advisory Group (CAG) is set to communicate with stakeholders through tutorials and other tools

Scope:

A permanent Tutorial Advisory Group is installed in SC B1 with the Scope to implement CIGRE TC’s suggestion that “Study Committees have to deal with education, continuous training, tutorials and publications”. The B1-TAG will be the working body within SC B1 to co-ordinate all activities in this field. It will work in close contact with the SC Chairperson, the Strategic Advisory Group B1.SAG and the Customer Advisory Group B1.CAG. It will involve all SC B1 Members and Conveners as contacts. The Terms of Reference of the B1.TAG are as follows:

• Organizing people to present tutorials. - List of qualified persons to give tutorials. - Assist in facilitating tutorials. - Work to establish a financial compensation system for presenters.

• Identification of the means to disseminate the SC B1 knowledge - prepare the structure of appropriate presentations (Paris Session, Tutorials,

Symposia, events organised by other learned societies, etc.) in accordance with the CAG

• Checking of Tutorials before submission to SC Chairman for approval - reading of Tutorials - opinion to the Convener - proposal of editorial comments, rewording of sentences

• Collection of SC presentations - establish an education and training procedure - preparation of a standard presentation, - each SC working body will prepare a full presentation (up to 80 slides), - the TAG will prepare a synthetic presentation (up to 4 slides)

• Coordination of activities with Electrical Power Engineering Education (EPEE) and with other SCs.

• Participation in the validation of the documents before publication

• Develop new presentation methods for communicating the work from SC B1 WG’s



Deliverables and Membership:

B1-TAG will present their findings and their productions regularly to the SC, at least twice a year or additionally whenever appropriate. External actions will only be taken after approval by the SC Chairperson and the B1.SAG, respectively.

Members are selected by the Convener and should possibly represent the variety of affiliation and geographical distribution of B1 stakeholders.

The Convener of B1.TAG is a permanent member of the B1.SAG.



Date: 23/07/2017


Study Committee B1

WORKING BODY FORM

Group No : WG B1.28 Name of Convener : Nigel Hampton (US)

TITLE of the Working Group :

On-site Partial Discharge Assessment of HV and EHV cable systems

Background:

Cable Systems undergo various steps in testing, specifically tests after installation. To provide additional information after installation, on-site pd measurements may be undertaken. Such measurements under field conditions may be complicated to perform, and complex to analyse, but can provide valuable data on the quality of the cable installation. There is a significant interest from the owners of using these techniques both for verifying the sound installation, but also for the purpose of diagnostic testing during the life of the cable system. The work of this WG, that has the strong support of IEC TC 20, will fill the need of widely accepted guidelines.

Terms of Reference:

The work should be limited to HV and EHV extruded AC cables, but addressing both commissioning and diagnostic testing,

The WG shall:

• - collect experience with PD testing, with respect to methods/equipment and results

• - evaluate the added value of the PD testing at site for commissioning and diagnostic testing

• - evaluate the applied technology, taking into account what previous CIGRE and ICC WG’s have done so far

• - recommend the protocol, to validate the on-site measurement results (calibration, sensitivity assessment)

• - recommend guidelines for PD test procedures at site (voltage level, measuring time, measuring conditions

• - identify widely acceptable requirements for commissioning and diagnostic testing

Deliverables:

• An Executive Summary article for Electra

• A full report to be published as a Technical Brochure

• A Tutorial

Created: 2008 The full report shall be made available for final review at the B1 annual meeting in 2011.

WG members from: AU, BE, BR, CA, HR, DK, FR, DE, IT, JP, KR, NL, PO, ES, SE, CH, UK, US.

Other stakeholding SC’s: D1

Approval by TC Chairman : Klaus Fröhlich Date : 03/11/2008


Study Committee No : B1

WORKING BODY FORM

WG N° B1.38 Name of Convenor : Mark FENGER (Canada)


Technical Issues # (2):9 Strategic Directions # (3):1

The WG applies to distribution networks (4): Yes

Title of the Group: After laying tests on AC and DC cable systems with new technologies

Scope, deliverables and proposed time schedule of the Group :

Background : Extruded (XLPE) insulation is rapidly becoming the insulation of choice in both new

and replacement transmission class cable circuits. While the cable and accessories are tested in the factory, the workmanship to install the accessories can only be tested after the installation has been completed and before the cable system is put into service. As DC testing, commonly used for FF cables, is not efficient for XLPE cables for AC transmission systems, attention has to be focussed on AC testing methods. The testing of DC cable systems will also be addressed to define which technology is the most appropriate. In the past, test equipment capable of testing long lengths of cables were not available so that a soak test at operating voltage for 24 hours was carried out by connecting the cable to the power system. In the last ten years different power sources have been developed that have the power rating to test long cable lengths. These include AC resonant power supplies, damped AC (DAC) and, more recently, very low frequency (VLF). In addition, there have been significant improvements in diagnostic tools such as off-line PD and dissipation factor measurement to assess the condition of a cable system. However, as there are presently only withstand test levels given in IEC 60840 and 62067 for AC resonant test voltages, there is a need to establish test voltage levels for other voltage sources and also establish suitable diagnostic tests.

Scope :

The WG will examine the present status, including limitations, of available voltage sources capable of testing HV and EHV, AC and DC, land and submarine transmission cable systems. The WG will also investigate the practical implications, risks and test burden related to the different test methods. The WG will examine the technical considerations involved to establish test parameters for AC and DC cable systems such as voltage levels, test durations (number of shots for damped AC) and frequency ranges for the different voltage sources and recommend what work needs to be done to establish these parameters if the technical background is not available. If the technical data are available, test parameters will be discussed and recommended for use. The merits of different diagnostic tests will also be addressed. The final report will be passed to IEC for further consideration regarding standardization. Great care will be taken to the work of D1.48 "Properties of insulating materials under VLF voltages"

Deliverables : The WG will prepare a TB that will include:

(a) Results of a survey of present test practices in different countries for both AC and DC, land and submarine transmission cable systems

(b) Results of a survey of test equipment presently available or under development (c) A review of technical considerations to establish acceptance test conditions for both AC and

DC transmission systems (d) Recommended test conditions based on technical considerations

The WG will also prepare a paper for Jicable 2015 and a Tutorial

Time Schedule : start : July 2012 Final report : 2015

Comments from Chairmen of SCs concerned : SC D1

Approval by Technical Committee Chairman :

Date :



WORKING BODY FORM

WG* N° B1.44 Name of Convenor : Caroline Bradley (UK)


Technical Issues # (2): 9 Strategic Directions # (3): 1

The WG applies to distribution networks: Yes

Title of the Group: Guidelines for safe work on cable systems under induced voltages or currents


Background :

During several phases of a cable system life (installation / maintenance / testing / upgrading

/ removal), it can be necessary to work under induced voltages or induced currents:

▪ During the pulling or the laying of a cable in the vicinity of an energized system:

▪ underground cable or overhead line

▪ During the jointing operations in the installation process

▪ When checking or maintaining link boxes

▪ During the repair of the cable after fault

▪ When removing the cable for disposal at the end of its life.

As hazardous conditions could occur, it is important to provide Target Groups (utilities,

manufacturers,…) with guidelines for safe work on cable systems.

NB: After several years of active work, IEEE/PES/ICC is now close to publish such guide, limited

to installations in ducts and manholes.

Scope :

All topics related to work under induced voltages or currents on land or submarine cables

shall be addressed in a comprehensive guide which will include the appropriate terminology.

The WG should address :

1. Extruded or lapped cable systems

2. HV but also MV and even LV AC when they are part of the connection scheme,

3. Permanent or fault conditions (Cable system stresses under grid fault)

4. Methods to calculate induced voltages and/or currents in various possible configurations

(including EMF or Magnetic effect from cables installed in the vicinity)

5. Protecting equipments (gloves, earthing systems....)

6. Jointing, Terminating and work on Link Boxes.

Deliverables : Technical Brochure proposing safe working procedures with summary in

Electra and a tutorial. A set of dedicated Tutorials.

The result of the work will be sent to IEC TC 20 for possible further consideration.

Time Schedule : start : April 2013 Final report : 2015

Comments from Chairmen of SCs concerned :


Approval by Technical Committee Chairman : Mark Waldron

Date : 03/04/2013



WORKING BODY FORM

WG* N° B1.45 Name of Convenor : Blandine HENNUY (Belgium)




Title of the Group: Thermal monitoring of cable circuits and grid operators’ use of

dynamic rating systems.


Background :

Nowadays, due to a more variable situation and increasing loads in the power grids, a dynamic rating system and other measurement values aid the asset manager in making optimal decisions in planning investments in the High Voltage grid. Based on measurement a grid operator can on the one hand decide if a hotspot in network should be taken away to increase the capacity or if the hotspot should be managed with the dynamic rating system and on the other hand will know the load and overload possibilities in real time and for the coming hours.

Scope

1) To review the literature (experience, history) on the subject 2) To establish the appropriate terminology and characterization parameters 3) To collect the present experience with thermal measurements on cable systems by

means of a questionnaire 4) To define the needs of the grid operator 5) To determine which data should be collected in order to assess the transmission

capacity of the link 6) To collect information about the technology 7) To examine the points of attention during installation 8) To describe the necessary maintenance operations and the time intervals between

those operations 9) The WG will take into account system complexity, effectiveness, ease of operation,

maintenance, history, experience of workers, practicality of retrofitting (if required) to existing circuits and cost.

10) The following assets will be managed: EHV, HV and MV cable systems, Underground and submarine cable systems and HVDC cable systems

11) The following points are considered as out of the scope: Integration with a temperature monitoring system of overhead lines, Systems that do not involve temperature measurements, Type, sample and routine tests of the systems and Thermal model of the cable system

Deliverables : Report to be published in Electra, Technical Brochure and tutorial

Time Schedule : start : 2014 Final report : 2016


Approval by Technical Committee Chairman : Mark Waldron

Date : 24/04/2014



WORKING BODY FORM

WG* N° B1.46 Name of Convenor : Milan Uzelac (United States)




Title of the Group: Conductor Connectors: Mechanical and Electrical Tests


Background :

Current IEC 61238-1 standard applies to connectors for medium voltage cables. There is no IEC standard for connectors for HV cables. The procedures from IEC 61238-1 along with manufacturer and user specifications have been used to type test HV cable connectors. The thermal, mechanical and resistance stability tests specified in current standard are applicable to HV but some requirements are specific to high voltage applications. These include dimensional and functional requirements of connectors within HV cable accessories, typically larger cable sizes, versatility of the conductor constructions as well as different circuit load patterns, short circuit levels and mechanical stresses due to tensile and thrust loads. The IEC WG16 of the TC20 commenced work on revision of current IEC61238-1 standard. During this work, some members of WG16, expressed interest that the scope of this standard is extended to high voltage cable application. The TF in charge of the revision believes this work needs to be done by a dedicated group of high voltage experts. At the Study Committee B1 meeting held in Paris on August 28 and 29 2012 it was agreed that a task force be established to consider if further guidance was needed on the testing of connectors for HV cable accessories. It was also decided during the meeting that the topics should be expended to cover mechanical loads, (not only thermal), to include all connectors (mechanical and other types) and to include termination and joints connectors.

Scope :

1 To review

• The range and types of connectors currently available.

• Existing international standards and the extent to which they cover the testing of

connectors.

• Any work been done by CIGRE, CIRED, JICABLE…

• Extent of service experience so far for different connector types.

• Customer needs.

2 To analyse

• Operation on high loaded systems where conductors are approaching or temporarily

exceeding maximum conductor operating temperature.

• Thermo-mechanical performance of connectors under cycling loads.

• Performance of connectors in short circuit conditions, taking into account thermal

and dynamic forces and actual network ratings.

• Performance of connectors installed in cable joints and terminations

3 To propose thermal and mechanical test regimes for connectors for HV and EHV cables


with special attention be given to connectors for large size cables.

• Type, routine and sample tests including mechanical, cycling and resistance stability

tests.

• Consider practicality of the short circuit test for large-size conductors and test loop

arrangement.

• WG should be free to consider mechanical tests (e.g. tensile, thrust forces…) in

order to evaluate mechanical strength of connection and physical properties of

connector itself.

• WG should be free to consider separate or integral test sequences combining

mechanical, cycling, short-circuit and resistance stability (assessment) acting on the

same samples.

• Extent of connector type test experience so far (for different connector types).

• Evaluate necessity of performing type tests on connectors that already successfully

passed qualification tests per IEC 60840.

• WG should consider range of type test approval

4 The WG should consider the tests that reflect mutual impact between connectors, cable

conductors and accessories.

5 The conductor connectors for HV and EHV applications are to be considered. The WG

will make recommendation to include or not connectors for MV applications.

Deliverables : Report to be published in Electra or Technical Brochure with summary in Electra. Tutorial

Time Schedule : start : January 2014 Final report : 2017


Approval by Technical Committee Chairman : M. Waldron

Date : 24/04/2014



WORKING BODY FORM

WG* N° B1.48 Name of Convenor : Eugene Bergin (IRELAND)




Title of the Group: Trenchless technologies for Underground Cables


Background :

In October 2001 Technical Brochure 194 was published, describing “Construction, laying and installation techniques for extruded and self-contained fluid filled cable systems”. The Technical Brochure included a brief description of innovative techniques including horizontal drilling, pipe jacking and micro-tunnelling. TB 194 describes the techniques, their limitations and the changes in cable design necessary to make use of each technique (for example, the changes needed in order to match the ampacity of a shallow, direct buried installation). Although much of the information on trenchless cable installation in TB 194 is still valid, it is relatively brief and few practical examples are given. There is increasing pressure to underground transmission circuits and it is becoming more common for a length of underground cable to be introduced into an overhead line circuit. There is also increasing pressure to reduce the cost of undergrounding and reduce the disruption (e.g. to traffic flow) caused when underground circuits are installed. A number of significant technical changes to underground cable circuits have been seen since TB 194 was written; for example, extruded cable has almost completely superseded fluid filled cable for new installations, delivery lengths for land cable have increased and there is a trend towards larger conductor sizes. There has been a large increase in the use of cable in sensitive habitats (e.g. shore landings for AC cable from offshore wind farms and DC cable interconnectors). In some cases the landing sites of submarine cables have been contaminated by prior use. Trenchless technologies do not disturb such sensitive areas and have been used in these applications. In addition to changes in cable technology and attitudes to undergrounding, there have been technical advances in the methods used for trenchless installation since TB 194 was written.

Scope :

1. To review the range of trenchless technologies currently available for cable installation ( HDD, pipe jacking and micro tunnels, …) 2. To review the technical constraints (thermal, mechanical, civil, geotechnical and environmental) relating to the trenchless installation of HV cable systems.


3. To provide examples of where trenchless techniques have been used in the installation of HV cable systems, highlighting the benefits and adverse experiences in each case. 4. The full cable tunnels should be excluded because they have their specific issues like fire, smoke, access, sharing with other services, etc. to be addessed and this topic has already been dealt in the TB 403 “Cable Systems in Multi-purpose or Shared Structures” by WG B1.08.

Deliverables : Technical Brochure with summary in Electra, tutorial



Approval by Technical Committee Chairman : M. Waldron

Date : 30/06/2014



WORKING BODY FORM

JWG* N° B1-B3.49 Name of Convenor : Pierre Mirebeau (France)SC B1


Technical Issues #: 10 Strategic Directions #: 1

The WG applies to distribution networks (4): No

Title of the Group: Standard design of a common, dry type plug-in interface for GIS

and power cables up to 145 kV


Background: Taking into account the market trend in some countries towards a commoditisation of the High Voltage cables lower or equal to 145kV, the working group B1-B3.33 had concluded that there is room in these voltage levels for a standard design in parallel with the present designs.

Scope :

The goal of the JWG is to recommend a functional design of an insulator with a common interface.

1. Current is ≤ 1000A (to be coherent with the chosen cross sections), short circuit ≤ 40kA 1 sec (evaluate the impact of going to 3 sec). Cross sections are ≤ 1000mm² Cu or 1600mm² Al (the cross section prevails)

2. Technology has to be defined (inner or outer cone), with a detailed evaluation of technical advantages/disadvantages of the two technologies.

3. The number of insulator sizes has to be defined; the short circuit current can be altered for the smallest sizes. Dimensions of insulator components have to be defined (current connection, electric design and properties, mechanical design and properties). The type and dimension of the main current connection have to be defined

4. Consideration to be given to the consequence of a termination failure, the upgrading of the cable link for higher current loads and installation constraints, with a special focus on the basement dimensions (current lower or higher than "1000A").

5. The design has to meet the requirements of IEC 62271-209 (full compatibility - dry type) and IEC 60840 and there is a need to define the initial and cross qualification processes

6. The stress cone design and material, the lubricant and the design of the compression device should be left to the discretion of the accessory manufacturer within the limits of the standardised insulator properties.

Cigre TB 303 and the work of WG B1.44 (work under induced voltage) and WG B1.46 (HV connectors) should be taken into account.

Deliverables : Report to be published in Electra or technical brochure with summary in Electra, tutorial


Comments from Chairmen of SCs concerned : B3 (+Nomination of experts)


Date : 30/06/2014


CIGRE Study Committee B1

WORKING BODY FORM

WG* N° B1.50 Name of Convener : Tiebin ZHAO (United States)



The WG applies to distribution networks (4): Yes / No

Title of the Group: Sheath Voltage Limiters and Bonding Systems (Design, Testing,

Operation and Monitoring)


Background :

The basic information needed to design a bonding system is included in several documents such as Electra 128-1990, TB 283-2005, and TB 347-2008. Some of these documents need to be updated. In addition it is noted that cable bonding components and related national regulations have changed in recent years. The WG plans to address related issues with sheath voltage limiters (SVLs) and bonding systems.

Scope :

1. Basic information

• Provide an overview of the functions of the bonding systems.

• Review existing documents and other engineering information related to bonding systems.

• Review service experience depending on bonding schematics, standing voltage and withstand levels.

2. Bonding system design

• Consider different bonding designs: single point, multiple point (solid), cross-bonding, and point out different challenges regarding screen protection of cable systems, including joints, terminations and link boxes.

• Provide basic knowledge (voltages, current rating, and energy absorption) for selection and implementation of bonding leads, link boxes and SVLs depending on cable system parameters and bonding designs.

• Provide recommendations for screen insulation coordination.

• Provide guidance on cable system models for overvoltage calculation using computer software. May work with liaison members nominated by SC C4 if such interests arise from C4 side on modeling aspects of this task.

3. Testing of bonding system

• Provide guidance on testing of bonding system components.

• Provide guidance on testing of bonding systems after installation. 4. Maintenance

• Provide recommendations on maintenance of bonding systems including SVLs.

• Provide testing criteria while considering interference with implemented monitoring systems.

• Consider monitoring of bonding systems


Deliverables : Technical brochure (that will supersede the existing documents) with summary in Electra, tutorial and recommendations to IEC




Date : 06/02/2015

(1) Joint Working Group (JWG) - (2) See attached table 1 – (3) See attached table 2 (4) Delete as appropriate



WORKING BODY FORM

WG* N° B1.52 Name of Convenor : Robert DONAGHY (Ireland)



The WG applies to distribution networks (4): Yes / No

Title of the Group: Fault Location on Land and Submarine Links (AC & DC)


Background :

The increasing number of land and submarine cable assets globally has created a focus on cable fault location capabilities. All faults in cable systems are different and cable fault location depends to a great extent on applying the appropriate technique or combination of techniques. The methods for locating power cable faults require competent engineers and service providers. Guidance is therefore required for engineers on the correct application of the various techniques available.

Scope :

1. To cover fault location on the following installed cable types: MV/HV/EHV; AC/DC; land and submarine cable systems; single core, 3-core and pipe type cables. 2. To focus on main insulation & sheath faults 3. To provide overview of existing fault location techniques and underlying principles 4. For land and submarine cable systems, to provide guidance and strategies for effective fault location for a variety of installation types including but not limited to:

• Direct buried cable systems

• Ducted land cable systems

• Cables between GIS bays

• Cables installed in horizontal directional drills and tunnels

• Cables at large burial depths

• Cable systems with different bonding types

• Very long cables

• … 5. To examine the different methods of pre-location and pinpointing from an accuracy and suitability viewpoint 6. To prepare a flowchart to assist in selecting appropriate methods according to fault type and cable type 7. To examine design factors (cable design and installation method) affecting fault location capability 8. To examine safety considerations 9. To examine marine vessel and support requirements for finding submarine cable faults 10. To collect case studies of fault location experiences 11. To examine training requirements for fault location personnel 12. To examine assess applicability of on-line methods to support fault location 13. To review new and innovative fault location techniques & future developments


14. The WG should not cover:

• Leak location in fluid filled cables

• Gas leak location on gas compression cables

• Diagnostic testing

• Defects in cathodic protection systems

Deliverables : Technical brochure with summary in Electra and tutorial




Date : 06/02/2015




WORKING BODY FORM

WG N° B1.54 Name of Convener: Harry Orton (Canada)


Technical Issue : 9 Strategic Direction : 1


Title of the Group: Behaviour of cable systems under large disturbances (earthquake,

storm, flood, fire, landslide, climate change)


Background:

This topic is extremely important since in the recent past, several large disturbances occurred in various countries. Everybody remembers for example the earthquakes in Nepal this year and Christchurch, New Zealand in 2010. More than 500 cable faults requiring repair were counted in Christchurch. In the closing session of the Auckland Symposium, in September 2013, the General Report outlined the need of further work in this area regarding cable design and/or installation design for seismic areas.

Scope: The Scope of Work will document the resultant damage, required repairs, recommend improved accessory and cable designs and suggest alternate installation methods for LV, MV, HV and EHV cable systems due to the occurrence of major disturbances. Major disturbances include the following events:

• Floods, fire and global warming,

• Major earthquakes, liquefaction and resultant landslide or tsunami,

• Hurricanes, cyclones, tornadoes, typhoons,

• Ice storms, windstorms and mud and/or landslides.

3.8 Terms of Reference:

The Terms of Reference should include, but is not limited to the following:

1) Assess extent of damage to the cable system categorised by event and voltage class,

2) Document the repairs carried out, 3) List spares required for deployment, 4) Recommend measures to mitigate damage severity, 5) Recommend cable and accessory design changes, 6) Recommend installation improvements, for example, alternative cable duct designs,

to use or not to use direct buried cables and to include cable snaking or not, 7) Suggest test protocols specific for each major disturbance, for example seismic

situations, reference industry and academic investigations, 8) Whenever possible visit utilities and sites to gain first-hand knowledge of events,

[email protected]


9) Evaluate existing international and domestic standards for their relevance to cable systems due to large disturbances, for example IEEE Standard 693-2005 on Recommended Practices for Seismic Design of Substations

10) Make contact with storm centres around the world to assess availability and advantages of early warning systems.

Deliverables: Technical brochure with summary in Electra and Tutorial

Time Schedule: November 2015 Final report: August 2018



Date : 11/11/2015



WORKING BODY FORM

WG* N° B1.56 Name of Convener : Frank de Wild (NETHERLANDS)




Title of the Group: Cable rating verification


Background :

WG B1.35 drafted a guide for rating calculations of insulated cables. One of the issues considered in that guide was the use of calculation tools. It was recommended by the WG that the user should verify the calculations of the tool before using it. Despite some tools being used frequently, and by multiple companies, it is generally unclear exactly how a calculation is performed by the calculation tool. Given the many different installation situations and cable designs which exist, and for which a strict IEC based calculation is not even possible (refer to the many examples in the technical brochure of WG B1.35), the user should verify how the situation is treated by the calculation tool. The assumptions made and the formulae used must be applicable, but these are not gathered in any standard. For dynamic or transient ratings, verification becomes even more important as the dynamic behavior significantly complicates the models and their output. As it is rather difficult to verify calculations of calculation tools, especially when these tools provide transient or dynamic ratings, or real life situations which are not precisely covered by IEC, it is currently proposed to help the cable community by setting up a uniform calculation verification protocol, which can be used to ensure a correctly working software within a certain (limited) domain

Scope :

To define and detail a uniform calculation verification protocol giving the possibility to the user to ensure a correctly working software within a certain (limited) domain. Steps to be taken are:

• Define the scope of the verification protocol (domain of applicability) in detail

• Define a limited series of: o duty aspects (steady state current, dynamic current, harmonics,..) o cable systems (MV, HV, submarine cable, DC cable,….) o installation types (direct, pipe, tunnel, air,…)

• Make calculations for defined situations

• Report calculation results in full detail

• Establish verification protocol (how to verify a software with these calculations, and how to interpret differences)

• Update B1.35 report and the tutorial It is noted that in this work, no verification of tools itself will take place.

Deliverables : The WG will add the verification protocol to the existing WG B1.35 report and re-publish the complete Technical Brochure. Also the tutorial will be updated.


Time Schedule : start : November 2015 Final report : October 2017



Date : 12/01/2016




WORKING BODY FORM

WG* N° B1.57 Name of Convenor : Søren Damsgaard Mikkelsen (Denmark)



The WG applies to distribution networks (4): No

Title of the Group: Update of service experience of HV underground and submarine

cable systems


Background :

In recent years, significant quantities of land and submarine cables and accessories have been installed and the associated technology and laying techniques have matured and evolved. With the increasing demands on electrical power transmission and distribution systems, including the need to connect new (renewable) sources of generation, significant quantities of land and submarine cable are currently being installed. In 2009, CIGRE WG B1.10 published a Technical Brochure (TB 379) which collated survey data relating to the installed quantities of underground and submarine cable systems rated at 60 kV and above together with the service experience/performance of existing underground and submarine cable systems. The surveys covered a 5 year period ending December 2005 for land cables and a 15 year period ending December 2005 for submarine cables. Our stakeholders have expressed the need to have these data updated. The WG Convener should consider setting up separate Task Forces to consider independently the statistics for land, submarine cable and DC systems. This would enable results for each type of cable to reported as soon as data are available rather than wait for all work to be completed.

Scope :

To update the service experience to the end of 2015, using a format comparable to earlier publications (where possible). Published information is to include:

• Land and submarine cables

• Type of current (AC, DC)

• Technology (the main designs of cables in use)

• Mode of installation (Land Cables: direct burial, tunnels, troughs, duct banks and Submarine Cables: protected or unprotected)

• Internal and external faults

• Number of faults per year. The voltage range will as limited to systems operating at 60 kV and above

Deliverables : Technical brochure with summary in Electra. A tutorial should be prepared and options for wider dissemination considered.


Time Schedule : start : November 2015 Final report : August 2018



Date : 12/01/2016




WORKING BODY FORM

WG N° B1.58 Name of Convenor : Slawomir Noske (PL)

E-mail address : [email protected]

Technical Issues # (2): 1 & 2 Strategic Directions # 2 : 1 & 2


Title of the Group: Condition Assessment and Diagnostic Methods to support Asset

Management of MV Cable Networks


Background :

MV power cable network are one of the most important parts of distribution power systems.

The oldest parts of cable networks consist of belted paper insulation lead covered (PILC)

cables and Polyethylene (PE) insulated cables. Since the 1970’s, cross linked polyethylene

(XLPE) insulated cables have supplanted the older designs. MV cable networks are

increasingly complex systems of interconnected cables that are regularly modified. As a

result, cable circuits often consist of a range of cable, joint and termination designs.

Consequently, the active aging processes exhibited by individual cable sections and

accessories may be at different stages.

Therefore, to effectively manage the cable network, a detailed knowledge of the technical

condition of individual circuit elements (cable segments, joints, terminations) is necessary.

In addition to the understanding of the current network condition, effective methods to

quality assess both installation and repair works to cable circuits is required as this has

been identified as a significant threat to the health of modern distribution networks. Many

novel diagnostic methods have been proposed for MV cable systems over the last few

decades. They are being used increasingly in MV cable network. Modern systems allow

network operators to record and analyze measurements in the field.

The new diagnostic methods can be a source of information about the condition of all cable

network elements and provide better information about condition of cable circuits after

installation. These information are very important to the development of asset management

this part of network.

Two of the primary measurement techniques include partial discharge (PD) and tan delta.

Both of these techniques generate information about the technical condition of insulation.

PD analysis facilitates the ability to measure parameters from individual sections of both

cables and accessories.

A number of individual distribution companies have gained sufficient practical knowledge to

effectively use these diagnostic results to inform maintenance and operational decisions.

The outputs of the Working Group should be: indicate the directions of MV cable asset

management development; indicate development of diagnostics technic, challenges and to

begin the standardization of diagnostic techniques across a broader range of stakeholders.


Scope :

The scope shall cover the following topics: 1. Asset management standards (include ISO 55000) and best-practice methods in MV

cable network

2. Diagnostic methods used in MV cable network and their economic impact

3. Cable diagnostics standards and requirements in electrical tests after both installation

and

repair work

4. Diagnostics in assessing technical condition of cable circuits.

5. Management of data received from diagnostic tests

6. Summary of the experience in development of asset management and diagnosis

methods, analysis of development trends.

Deliverables : Technical brochure with summary report in Electra, tutorial




Date : 06/02/2017



WORKING BODY FORM

WG N° B1.60 Name of Convenor: Bart Mampaey (BELGIUM)


Strategic Directions #2: 1, 2 and 3 Technical Issues #3: 8, 9 and 10

The WG applies to distribution networks4: Yes

Potential Benefit of WG work #6: 5

Title of the Group: Maintenance of HV Cable Systems

Scope, deliverables and proposed time schedule of the Group:

Background:

During the 71th CIGRE SC B1 meeting held in Kristiansand (Norway) on August 31 September 2-4, 2015 it was decided to set up a TF on the topic: “To update TB 279 Maintenance for HV cables and Accessories, with the request to advice if it is feasible or not to set up a WG on the subject. The TF concludes that there is a clear need for a WG to update TB 279, actively dealing with the following items :

• To collect feedback from utilities on the present situation and future needs by circulating a questionnaire to utilities

• To make the present TB 279 more complete by including AC submarine cables and DC cables

• To describe modern methods for condition based maintenance and to pay attention to new developments

• To focus on practical cases of maintenance

• To consider the position of Fluid Filled (FF) cables and their increasing need for maintenance

• To include aspects of maintenance cost

Scope:

1. To review:

• Existing maintenance practice of utilities, by circulating a questionnaire;

• Customer needs at present and for the future;

• The position of FF cable systems 2. To analyse:

• Modern methods

• New developments

• Cost /benefit maintenance cases 3. To propose:

• Maintenance for HV AC and HV DC cables, for extruded and lapped insulation and for both land and submarine applications, and this for cable systems with voltages above 36kV (Um).

• New methods/developments for condition based maintenance

• Increased attention to practical maintenance cases

• Introduction of costs related maintenance actions


The WG will consider HV AC and DC cables, with extruded and with lapped insulation, for land and for submarine applications including their accessories

Deliverables:

Technical Brochure and Executive summary in Electra

Electra report

Tutorial5

Time Schedule: start: January 2017 Final Report: December 2019


Date : 17/03/2017



WORKING BODY FORM

WG N° B1.61 Name of Convenor: Eugen Bergin (IRELAND)


Strategic Directions #2: 1 and 2 Technical Issues #3: 9

The WG applies to distribution networks4: No


Title of the Group: Installation of HV Cable Systems


Background:

The SC B1 has recommended to update the Technical Brochure 194 “Construction, Laying and Installation Techniques for Extruded and Self-contained Fluid Filled Cable Systems” from 2001. The existing TB 194 has the following Chapters:

1) Introduction 2) Description of the Cable System 3) Construction Techniques 4) Cable Installation Design and Laying Techniques 5) External Aspects 6) Design of a Link 7) Glossary 8) Bibliography

The revisions to TB194 should also take the following recent CIGRE SC B1 work, if applicable, into account:

• TB 640 Guide for Rating of High Voltage Cables – in this TB the main installation configurations have been described

• The work of WG B1.48 on Trenchless Technology, will be completed soon

• The work of WG B1.41 on Long Term Performance of Soil and Backfill for Cable Systems is also close to completion

• The work of WG B1-34 on Mechanical Forces in Large Cross Section Cable Systems has identified some areas where TB 194 should be updated

• The work of TF B1-53 on Installation Related Cable Damages suggested that including information regarding the following topics:

• How to co-ordinate cable design, engineering and installation given project interfaces between different companies

• Add best practices and practical examples to the installation guidelines • Add examples of cable damage related to installation errors.

Some new cable constructions are being introduced in some countries and these should be considered.

Scope:

1. To review existing and innovative methods for HV cable installation. The review should include cable installed in trenches, ducts and tunnels.

2. To compare the relative merits of the installation methods and to give recommendations for their application.


3. The method of working will be : a. Remind existing practices for cable installation and identify the factors

responsible for the choice of a particular practice. b. Review possible innovations, improvements and alternatives in the light of

increasing economic and environmental pressures. c. Give recommendations for the application of new installation technologies to

high voltage cable systems. 4. To review the calculations and parameters necessary to perform design calculations

for cable installation (including for example, on the one hand, pulling tension during installation, and on the other hand requirements for installations in tunnels, ducts, manholes and towers).

5. To compare theoretical productions with the results of engineering trials. 6. To recommend simplified methods for the calculation of design parameters for cable

laying. The scope of this WG covers extruded and self-contained fluid filled cable systems; submarine cables are not included in the scope of this WG

Deliverables:


Electra report

Tutorial5

Time Schedule: start: June 2017 Final Report: August 2020

Approval by Technical Committee Chairman:

Date: 17/03/2017



WORKING BODY FORM

WG N° B1.62 Name of Convenor: Stefano Franchi Bononi (ITALY)


Strategic Directions #2: 1, 2 Technical Issues #3: 3, 10


Potential Benefit of WG work #6: 2, 3, 5

Title of the Group: Recommendations for Testing DC Extruded Cable Systems for Power Transmission at a Rated Voltage up to and including 800 kV


Background:

The big demand for transmission of high electrical power in long distances has fostered the fast and successful development, in recent years, of extruded insulation technologies HVDC Transmission Systems at increasing current and voltage levels; in fact, both traditional and newer technologies are evolving. Extruded 320 kV DC cable systems have been developed, qualified and installed in numerous cases and the way to increase voltage levels and conductor sizes looks to be still evolving. The majority of the HVDC extruded systems qualified and installed, today are based on XLPE technology. However other extruded technologies, using either uncross linked or partially cross-linked materials, have been introduced and in some case installed. For these reasons, the new Technical guidelines should take into consideration all the different technologies. Furthermore, important technological milestones in the field of extruded dielectrics have been achieved when the feasibility has been demonstrated, according to CIGRE TB 496 scope of test, for extruded cable systems operating at voltages much higher than 500 kV though Current TB 496, even if rather recent (April 2012), is only covering rated voltages up to 500 kV. In the field of laminated insulation cable systems, recent progresses achieved indicate the availability of higher than 500 kV PPL and Mass Impregnated paper insulated HVDC cable systems. These systems are generally tested according to the Technical Report published in Electra 189 (April 2000) and a following Addendum (Electra 218, Feb 2005), covering rated voltages up to 800 kV. In this scenario, it is relevant that CIGRE undertakes works leading to, at least, clear guidelines to specify appropriately extruded cable systems dedicated to voltage higher than 500 kV. It was decided by SC B1 to include in the scope of work of WG B1.62 solid insulated cable systems for the voltage class up to, and including, 800 kV. As the new guidelines for extruded cable systems could change some test methods (e.g.: impulse superimposed onto HVDC) SC B1 decided to launch in parallel a WG for laminated cable systems to introduce the same methods, if appropriate, and revise ELECTRA 189 if needed. In this way same tests specified in different guidelines will have same test



methods. The resulting recommendations should help manufacturers, installers and users to design, test and operate the whole cable system.

Scope:

Solid insulated cable systems for the voltage class up to, and including, 800 kV.

WG will cover:

1. Review of Test loop heating (see TB 496 1.5.5)

2. Definition of Rated and Max Voltage

3. Review of Superimposed impulses test (TB 496: chapters 3.5 and 4.4.3)

4. Definition of Transient phenomena for HVDC cables in case of fault (Temporary

Over Voltage)

5. Definition of voltage levels for Type, Prequalification (PQ) and Commissioning Tests,

avoiding unnecessarily high test voltage

6. Review of PQ test sequence (TB 496 chapter 3.4)

7. Review of Routine Tests (TB 496 Chapter 5)

8. Review of Sample Tests (TB 496 Chapter 6)

9. Assessment whether TB 303 is enough to define what means “significant change” in a

cable system, in order to know when a PQ/Type Test has to be performed.

10. Definition of an extension of qualification test shorter than PQ for peculiar application

The WG may benefit from collaboration with JWG B4/C1.65 and JWG B4/B1/C4.73.

Deliverables:


Electra report

Tutorial5

Time Schedule: start: January 2018 Final Report: January 2021


Date:



WORKING BODY FORM

WG N° B1.63 Name of Convenor: Emmanuelle LAURE (FRANCE)


Strategic Directions #2: 1 Technical Issues #3: 9

The WG applies to distribution networks4: Yes / No


Title of the Group: Recommendations for mechanical testing of submarine cables for

dynamic applications


Background:

There is a need to develop an international standard for HV dynamic cables systems used to connect floating wind farms and tidal and wave converters to the grid. The existing standards for the design of Oil and Gas umbilical cable systems under mechanical fatigue (ISO 13628-5 and DNV-RP-F401) provide a good basis for specifying MV and HV dynamic cables but they do address all topics adequately. Electrical and thermo-mechanical aspects, and the specificities of floating wind turbines must be considered in addition to mechanical aspects. Recently, two CIGRE TBs have included dynamic cables in their scope of work: a chapter of CIGRE TB610 deals with generalities of dynamic cable design, and chapters of CIGRE TB623 deal with fatigue analysis and recommendations for dynamic cable type-testing, although many parameters remain to be discussed and defined. The role of this new CIGRE WG is to develop common and clear guidelines for mechanical test of the whole system (equipment and installation) upon project characteristics (external constraints, life duration expected, safety factor, etc.).

Scope:

Dynamic cable systems includes the cable and its ancillary equipment such as hang-offs, bend stiffeners, bend-restrictors, transition joints, etc. The purpose of this WG is to develop a stand-alone document providing detailed guidelines for the design and the functional parameters, for the testing of the whole dynamic cable system, for supply and installation requirements, and covering at least floating platform and floating wind turbine cases. The opportunity to define a base case for dynamic loads and the related basis design will also be assessed by the WG. For the range of insulated cables referred to in TB623*, this WG will:

1. Review cable design particularities for dynamic behaviour and document the state-of-the-art of cable design for each voltage range

2. Examine relevant standards and recommendations and provide references to standards applicable to dynamic cables


3. Describe system installation design (lazy wave, etc.) and ancillary equipment needed 4. Assess all the parameters leading to mechanical fatigue of dynamic cable systems 5. Assess the functional requirements of dynamic cable systems 6. Write recommendations for dynamic analysis taking ISO 13628-5 as a starting point

and making use of the tools available within the scientific community. These recommendations will:

a. Include detailed input data required, b. Provide clear guidelines for safety factors to be used, c. Include guidelines to choose the right weather data, and take into account

wave statistics, d. Develop guidelines to choose representative load cases for extreme load

effects and fatigue, e. Include marine growth aspects and abrasion issues at the touch-down area.

7. Write test protocols and recommendations to be performed on the cable building

upon feedback from cable suppliers and from CIGRE TB623 and DNV-RP-F401 recommendations. These protocols and recommendation will:

a. Make the link between the fatigue analysis and the tests parameters to be chosen,

b. Define a full scale fatigue test and the maximum frequency of such a test c. Review the feasibility of including thermo-mechanical constraints during

testing, d. Review the feasibility of including electrical constraints during testing, e. Study the technical need to make the fatigue test a preconditioning test to

electrical type-tests, f. Define specific tests relating to the cable design (e.g. the addition of a

specific test for wet design cables). 8. Write recommendations for design verification via software simulations and their

complementarity with testing program. 9. Write recommendations for specification of sensors for cable monitoring

* Cable systems intended to be used in AC and DC power transmission systems with rated voltages above 30

(36) kV AC or 60 kV DC. It is the opinion of the WG that the TB can also be used for voltages down to 6 (10) kV

AC or 10 kV DC.

Deliverables:


Electra report

Tutorial5

Time Schedule: start: November 2017 Final Report: August 2020

Approval by Technical Council Chairman:

Date: 17/01/2018



WORKING BODY FORM



WORKING BODY FORM

WG N° B1.66 Name of Convenor: Gunnar Evenset (Norway)


Strategic Directions #2: 2 Technical Issues #3: 3,10


Potential Benefit of WG work #6: 2,3,5

Title of the Group: Recommendations for testing DC Lapped Cable Systems for power transmission at rated voltages up to and including 800kV


Background:

The demand for transmission of large amounts of electrical power over long distances has increased the use of DC cables. DC cables with insulation system with lapped paper or polypropylene laminated paper have been used for several decades and these cable systems have proven to have excellent reliability. DC cables with extruded insulation materials were introduced to the market 15-20 years ago and have taken over most of the market for cable systems up to 300-400 kV. The technology for extruded DC cable systems is under constant development and the voltage level for extruded systems is expected to increase in the coming years. However, DC cables with lapped insulation are currently used for the highest voltage levels and will probably still be used for some of the largest transmission links in the coming years, especially long submarine transmission links. HVDC cable systems with lapped insulation are, in most cases, qualified and tested according to the guidelines from Cigre published in Electra No. 189 in year 2000 – “Recommendations for tests of power transmission DC cables for a rated voltage up to 800 kV”. This recommendation was later supported by the addendum published in Electra 218 in 2005. The existing test recommendations do not consider the new development in converter technology as they were prepared before voltage source converters became generally available to the market. Voltage source converters are now in operation with lapped cable systems at levels above 500kV and there is a need to review the test recommendations in light of the new developments. The recommendations in Electra No. 189 and 218 should also be combined into an updated technical brochure to make the content easily available to target groups. It is therefore proposed to establish a working group to review the existing test recommendation, including the addendum, for lapped HVDC cables up to 800 kV. The work will be performed in parallel to WG B1.62, which will prepare an extension of the test recommendations for solid insulated cable systems up to 800 kV, in order to harmonize test requirements if applicable. The updated technical brochure will assist target groups with guidelines to qualify and test lapped DC cable systems.


Scope:

Test recommendations for lapped cable systems for the voltage class up to and including

800 kV.

The WG will cover:

11. Review of definitions

12. Review of references

13. Review of existing test requirements in Electra No 189/218.

14. Consideration of the introduction of test requirements for operation of lapped DC

cables with voltage source converters

15. Combining the test requirements from Electra No. 189/218 and any new

requirements from the work into a technical brochure

The WG may benefit from collaboration with WG B1.62, JWG B4/C1.65 and JWG

B4/B1/C4.73.

Deliverables:


Electra report

Tutorial5

Time Schedule: start: March 2018 Final Report: January 2021


Date: 01/03/2018


Table 1: Technical Issues of the TC project “Network of the Future” (cf.

Electra 256 June 2011)

1 Active Distribution Networks resulting in bidirectional flows

2 The application of advanced metering and resulting massive need for exchange of information.

3 The growth in the application of HVDC and power electronics at all voltage levels and its impact on power quality, system control, and system security, and standardisation.

4 The need for the development and massive installation of energy storage systems, and the impact this can have on the power system development and operation.

5 New concepts for system operation and control to take account of active customer interactions and different generation types.

6 New concepts for protection to respond to the developing grid and different characteristics of generation.

7 New concepts in planning to take into account increasing environmental constraints, and new technology solutions for active and reactive power flow control.

8 New tools for system technical performance assessment, because of new Customer, Generator and Network characteristics.

9 Increase of right of way capacity and use of overhead, underground and subsea infrastructure, and its consequence on the technical performance and reliability of the network.

10 An increasing need for keeping Stakeholders aware of the technical and commercial consequences and keeping them engaged during the development of the network of the future.

Table 2: Strategic directions of the TC (ref. Electra 249 April 2010)

1 The electrical power system of the future

2 Making the best use of the existing system

3 Focus on the environment and sustainability

4 Preparation of material readable for non-technical audience

Table 3: Potential benefit of work

1 Commercial, business or economic benefit for industry or the community can be identified as a direct result of this work

2 Existing or future high interest in the work from a wide range of stakeholders

3 Work is likely to contribute to new or revised industry standards or with other long term interest for the Electric Power Industry

4 State-of-the-art or innovative solutions or new technical direction

5 Guide or survey related to existing techniques. Or an update on past work or previous Technical Brochures

6 Work likely to have a safety or environmental benefit

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