Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

download Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

of 56

Transcript of Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    1/56

    Prepared for: Prepared by:10Mwp SPV Lanco Solar Power Pvt LtdChadiyana Plot No 229, Udhyog Vihar Phase

    Gurgaon -122002Date :28-07-2011

    Technical Specifications for Electrical

    System Installation

    ( Including supply of contractors scope)

    10MWp SPV at Village Chadiyana,

    Gujarat.

    Document No : LSEPL-003-PV-EL-807-X-2050 -REV 0

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    2/56

    Prepared for: Prepared by:10Mwp SPV Lanco Solar Power Pvt LtdChadiyana Plot No 229, Udhyog Vihar Phase

    Gurgaon -122002Date :28-07-2011

    Technical Specifications for Electrical

    System Installation

    ( Including supply of contractors scope)

    10MWp SPV at Village Chadiyana,

    Gujarat.

    _________________________________

    Prepared By [Rahul Shelke]

    _________________________________

    Reviewed By [Rajneesh Shrotriya]

    _________________________________

    Approved By [N S Prasad]

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    3/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.docAugust 2011

    i

    Contents

    1.0 Introduction ................................................................................................................... 1-1

    2.0 SCOPE OF WORK ......................................................................................................... 2-22.1 LSEPL SCOPE OF WORK ................................................................................................. 2-22.2 SCOPE OF WORK UNDER PACKAGE-20 ....................................................................... 2-2

    3.0 Proposed Plant Overview ............................................................................................. 3-43.1 MODULE STRING / ARRAY CONFIGURATION .............................................................. 3-53.2 GENERAL SPECIFICATION FOR ELECRICAL EQUIPMENTS IN SOLAR FARM ........ 3-8

    3.2.1 HV, MV and control cables ................................................................................... 3-83.2.2 Lighting System .................................................................................................... 3-93.2.3 Earthing system .................................................................................................. 3-10

    3.3 TEST PROCEDURES. ...................................................................................................... 3-133.3.1 POWER TRANSFORMER ................................................................................. 3-133.3.2 HIGH VOLTAGE SWITCHGEAR ...................................................................... 3-143.3.3 MEDIUM VOLTAGE SWITCHGEAR ................................................................. 3-153.3.4 H.T. CABLE ........................................................................................................ 3-173.3.5 L.T. CABLE ......................................................................................................... 3-173.3.6 WIRING ............................................................................................................... 3-173.3.7 INSULATING LIQUID DIELECTRIC TEST ....................................................... 3-183.3.8 EARTHING ......................................................................................................... 3-18

    4.0 CONTRACTORS SCOPE OF WORK......................................................................... 4-204.1 CHANGE IN SCOPE OF WORK ...................................................................................... 4-204.2 SET OF DOCUMENTS / INFORMATION TO BE PROVIDED BY CONTRACTOR. ..... 4-204.3 ENGINEER-IN-CHARGES INSTRUCTION .................................................................... 4-214.4 RIGHT OF THE OWNER. ................................................................................................. 4-22

    4.4.1 Discrepancy in Contract. .................................................................................... 4-224.4.2 Right to direct work ............................................................................................. 4-224.4.3 Right to Order Modifications of Methods and Equipment. ................................ 4-224.4.4 Right to Inspect the Work ................................................................................... 4-22

    4.5 CONTRACTORS FUNCTIONS. ...................................................................................... 4-234.6 DUTIES OF THE ONWER/ VIS-A-VIS THE CONTRACTOR. ........................................ 4-24

    4.6.1 SUPPLY OF TOOLS, TACKLES AND MATERIALS. ....................................... 4-25 4.6.2 PROTECTION OF PLANT. ................................................................................ 4-254.6.3 UNLOADING, TRANSPORTATION AND INSPECTION ................................. 4-264.6.4 QUALITY, INSPECTION AND REJECTION OF MATERIAL ........................... 4-274.6.5 STORAGE OF EQUIPMENT ............................................................................. 4-27

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    4/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.docAugust 2011

    ii

    4.6.6 APPROVALS ...................................................................................................... 4-284.6.7 REVIEW AND COORDINATION OF ERECTION WORK. ............................... 4-28

    4.7 MISCELLANEOUS RESPONSIBILITIES ......................................................................... 4-294.7.1 Civil foundation ................................................................................................... 4-294.7.2 Modifications of work .......................................................................................... 4-29

    5.0 Bill of material ............................................................................................................. 5-315.1 Package 20 Integrated Electrical ...................................................................................... 5-335.2 BOQ Container ( Package 20) .......................................................................................... 5-44

    6.0 Drawings Enclosed: .................................................................................................... 6-506.1 Single Line Diagram .......................................................................................................... 6-506.2 Switchyard and control Room Layout ............................................................................... 6-506.3 Switchyard Earthing Layout. .............................................................................................. 6-506.4 Plot Plan ............................................................................................................................. 6-506.5 Other drawings will be released from site during construction. ........................................ 6-50

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    5/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.docAugust 2011

    iii

    List of Tables

    Table 1 characteristics of the string combiner box .................................................................................... 3-6Table 2 Recommended IEC/IEEE standard ............................................................................................. 3-8Table 3 List of approved make of material .............................................................................................. 4-29Table 4- Package 20 Integrated Electrical .............................................................................................. 5-33Table 5 BOQ Container (package 20) .................................................................................................. 5-44

    List of Figures

    Figure 1 Typical Layout of 1MWp Plot module for PV Plant .................................................................... 3-7

    http://e/RAHUL/Technical%20Specifications%20for%20PRS/NEW%20FORMAT%20TECH%20SPEC/15MW%20Chadiyana/Electrical%20Tender%20Document-%2010MW%20CHADIYANA%20package%2020%20and%209.doc%23_Toc299728527http://e/RAHUL/Technical%20Specifications%20for%20PRS/NEW%20FORMAT%20TECH%20SPEC/15MW%20Chadiyana/Electrical%20Tender%20Document-%2010MW%20CHADIYANA%20package%2020%20and%209.doc%23_Toc299728527http://e/RAHUL/Technical%20Specifications%20for%20PRS/NEW%20FORMAT%20TECH%20SPEC/15MW%20Chadiyana/Electrical%20Tender%20Document-%2010MW%20CHADIYANA%20package%2020%20and%209.doc%23_Toc299728527
  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    6/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    1-1

    1.0 Introduction

    LSEPL (Lanco Solar Energy Pvt. Ltd) Gurgaon, invites tender as per the following document, intended tospecify the requirement of Installation and invites offers from reputed Agencies for the following Supplies

    and Services.

    PACKAGE-20:

    Installation ,Testing and commissioning of 6 nos 1000kW Inverters, DCDB, SCADA, internal cabling etc,

    inside a 20 feet container, including all the cabling from Module to Module, Module to Junction Boxes,

    Junction Boxes to Combiner Boxes and from Combiner Boxes to Inverter. The Combiner Box is part of

    Inverter. Earthing of Module structures and Inverters, Laying and termination of DATA & Communication

    cable. The Connection from Inverter to 0.300/11 kV, 1250 KVA Transformers including interconnection of

    11 KV RMU are also included. Installation testing and commissioning of 250kW Traker Inverters (14nos of

    20kW each),with cabling from module to box, box to inverters etc.

    All equipment and cables, structure shall be LSEPLs supplied items.

    Bidders may offer Package- 20.The Bid evaluation will be done on Package wise basis.

    The detailed scope of work is given under separate BOQ.

    Time Period for Completion of Packages shall be as per the terms and conditions of contract each, from the

    date of order confirmation / Purchase Order/Service Order.

    Owener reserves the right to award one or all the package to any bidder.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    7/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    2-2

    2.0 SCOPE OF WORK

    2.1 LSEPL SCOPE OF WORK1. Land Procurement and leveling/grading

    2. Fencing of Site

    3. Site entry gate

    4. Civil works for Package-20

    5. Construction Power

    6. Allocate Space for site office of Contractors

    7. Electricity for Contractors site office will be chargeable as per Discom rates, if available at Site. In

    case of non availability of electricity, Contractor shall have to arrange DG sets.

    8. Construction Water

    Procurement and free issue items to Contractors:

    1. PV Modules

    2. PV Support Structures

    3. PV Clamps, Junction Boxes

    4. Inverters and their shelters with foundations

    5. Cables

    6. Power transformers circuit breaker , C&R Panel,MV Switchgear,RMUs.

    7. Please refer BOQ for Package 20 for detail scope of Free Issue material and scope of contractor

    2.2 SCOPE OF WORK UNDER PACKAGE-20

    1. Complete Erection of Inverters DCDB, SCADA, String boxes, RMUs in side shelter, 300 VAC/11

    KV 1250 KVA outdoor transformers.

    2. Entire DC Cabling module to module connections.

    3. Connection/Cabling from Combiner Box to Inverter DC Terminals

    4. Connection/Cabling from Inverter AC Terminals to 0.300/11kV Transformers LT side

    5. Earthing of PV field including inverter

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    8/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    2-3

    6. Installation of Lightning protection of PV field

    7. Complete site testing, and commissioning of PV Field and Inverters DCDB, SCADA, String boxes,

    RMU 300 VAC/11 KV 1250 KVA transformers.

    8. Installation and testing of 250 kW tracker system. ( 14 nos 20 kW Inveters with cabeling)

    9. Handing over the scrap and balance of material at the LSEPLs storage area

    Bill of Quantities (BoQ) is attached as separate Attachment

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    9/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-4

    3.0 Proposed Plant Overview

    The proposed PV project is of fixed, south facing orientation, tilted from the horizontal to maximize the totalannual incident solar irradiation. The PV modules selected are of Polycrystalline type and are electrically

    connected with cables sized to minimize DC ohmic losses. The DC electrical output from the PV modules is

    fed via cables to string combiner boxes, and through DCDB lead to inverters. The inverters convert the DC

    electrical output to AC at 300V.

    The cable routes from inverter lead to the MV transformers stepping up voltage to 11kV. Individual Inverter

    shelters will make Ring Main system of 11 KV as per SLD. This voltage shall further be stepped up for

    power evacuation at 66kV leading to main substation owned and operated by Gujarat Energy Transmission

    Corporation Ltd. (GETCO). The metering point for the evacuated power shall be within the plant location at

    66kV.

    The PV module support structures will be locally fabricated in mild steel with appropriate hot dippedgalvanizing. They will be spaced and positioned in order to minimize the effect of inter row shading.

    The proposed plant has been configured with an installed PV capacity of 10 MW peak (MWp).

    The site is described in the following sections and issues regarding its suitability for sitting a PV power plant

    are discussed.

    63 kVA construction Power will be made available at one single point for the whole plant. Further distribution

    and cabling, providing suitable switchgear is in the scope of respective Contractor.

    Type- Shall Be informed later to succsessful bidder

    Max. output, Pmax, at STC (W)

    Maximum power voltage, Vmpp (Volts)

    Maximum power current, Impp (A)

    Open-circuit voltage, Voc (V)

    Short-circuit current, Isc (A)

    Length (mm)

    Width (mm)

    Thickness (mm)Weight (kg)

    Total Nos of modules to be installed

    Installation of steel structure for module

    fixing

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    10/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-5

    3.1 MODULE STRING / ARRAY CONFIGURATION

    The plant is designed such that each inverter is connected to Parallel strings boxes and series parallel string

    connections at String monitoring boxes. This arrangement ensures the current and voltage levels match the

    specification of the inverters. The configuration is summarized in the SLD.

    The DC electricity generated by the modules is converted to AC in the inverters. The design uses 1000 KW

    transformers less inverters, as selected by LSEPL. These are three phase inverters, which are clustered in

    groups of two for a single plot module of 1.0 MWp.

    All the DC and AC cables are designed for outdoor application with a continuous ambient temperature of

    50C. They are sized for a power loss below 2.5 % and a voltage drop less than 3%.

    DC CABLING (CABLE WILL BE FREE ISSUED TO THE CONTRACTOR OF PACKAGE- 20)

    All the modules shall be equipped with attached junction boxes with 4mm2 connecting leads. Modules will

    be interconnected to form a string of 24 modules using these leads, Subsequent to string combiner box(SCB), 2 Cores of 95 mm2 multi-stranded copper cable will lead to DCDB of inverters.

    The three phase AC output from each of the inverters of a plot will be connected to the LV winding of

    1250kVA transformer using three runs 6Rx1Cx 240mm2 copper cables for stepping up the voltage to 11kV

    located centrally in the plot.

    Power will be fed from the high voltage side of each transformer through one run of 3 core, 240 mm2, 11 kV

    XLPE insulated cable to the MV Switchgear panel forming double bus. Power will further be stepped up to

    66kV at the power plant premises.

    The string combiner box will be weather proof and for outdoor application with the IP65 protection level.

    These shall have high resolution monitoring of PV generator with measuring individual string current andconnectivity interface of RS 485 ports/CANBUS.All the string combiner boxes shall be equipped with string

    fuse protection, over voltage protection devices and DC switch.

    Table below summarizes some important characteristics of the string combiner box.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    11/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-6

    Table 1 characteristics of the string combiner box

    String Combiner Box Technical Details

    Maximum DC Voltage Shall Be informed later to succsessful bidder

    Maximum DC Current

    Number of measuring channels

    Protection Level

    Operating temperature range

    Relative humidity

    No of terminations

    The low voltage station will comprise of 0.300/11kV, 1250kVA, 50Hz ONAN type step-up transformers

    suitable for continuous operation. The transformers have been selected to operate at maximum efficiency

    and to be rated for a maximum temperature rise of 50C with a daily average ambient temperature of 45C.

    The transformer cores shall be constructed from CRGO electrical grade steel sheet laminations. Winding

    conductor material should be electrolytic grade copper, free from any scales with no possibility of

    shrinkages. The core and copper losses shall be minimal.

    There will be dedicated earthing stations for transformer, MV switch boards and high voltage panels.

    Maintenance free earthing stations have been considered for the designs. All the modules shall be

    appropriately earthed in accordance to the NEC.

    The entire PV plant and the electrical room will be protected from lightning. The protection system will be

    based on early streamer emission lightning conductor air terminals. The air terminals shall provide anumbrella protection against direct lightning strike covering a radial distance of 60m. The air terminal will be

    capable of handling multiple strikes of lightning current and should be maintenance free after installation.

    The lightning arrestor will be installed distributed across the site with a mast height of 5m.

    These air terminals will be connected to respective earthing stations, and an earthing grid will be formed

    connecting all the earthing stations through the required galvanized iron tapes.

    Power shall be evacuated at 66kV level at the GETCO transmission substation owned and operated by

    GETCO. The point of interconnection at 66kV level will be at plant location, further electrical infrastructure

    will be provided by GETCO.

    Typical Layout of 1.0 MWp Solar PV Plant is as below showing general arrangement of modules andInvertors.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    12/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-7

    Figure 1 Typical Layout of 1MWp Plot module for PV Plant

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    13/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-8

    3.2 GENERAL SPECIFICATION FOR ELECRICAL EQUIPMENTS IN SOLAR FARM

    The Equipment In General, shall confirm to the following Indian / IEC Standards

    Table 2 Recommended IEC/IEEE standard

    Sr. No. Equipment Standards

    1 PV solar Module IEC61215 / IEEE1262

    2 Transformer IS 2026 / 335

    3 HT switchgear IEC 298 /IS 3427

    4 Circuit Breaker IEC 56/ IS 13118

    5 HT Cables IS 7098

    6 LT Switchgear IS 4237/ IS 4047

    7 LT Cables IS 1554

    8 LT Busduct IS 8623

    9 Current Transformer IS 2705

    10 Potential Transformer IS 3156

    11 DC Battery IS 1651/ IS 1652

    12 Illumination system IS 3646

    13 Earthing IS 3043

    14 Lightning Protection IS2309

    15 UPS IEC 146

    16 Control / Relay Panels IS 4237/IS 8623/ IS 323/ IS

    3842/ IS 4483

    17 Motor IS 325/IS 4029

    18 Installation , Testing and Comissioning Relevant IS/IEEE

    The equipments shall conform to these specifications and Indian Standards. Equipment shall be suitable for

    installation and satisfactory operation in the specified service conditions. All equipments shall be of brand

    new condition and with proven track record.

    3.2.1 HV, MV and control cables

    All HV, MV and control cables shall conform to the specifications. The cabling work shall conform to the

    erection specification for cabling. Cable layout drawings, cable schedule, interconnecting diagram, etc. shall

    be prepared by the contractor and shall be reviewed by LSEPL/Employer.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    14/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-9

    Cables shall be laid in RCC trenches with RCC covers in switchyard in prefabricated G.I cable trays in

    multi/single tier arrangement. All high voltage cables shall be XLPE insulated, armored and PVC overall

    sheathed, aluminum conductor cables. 1.1 KV grade cables shall be PVC insulated, PVC sheathed,

    armored cable with aluminum conductor. The control cables shall be PVC, 1.1 KV grade, insulated, PVC

    sheathed armored cable with copper conductor. The power and control cables shall have the following

    minimum cross sectional areas:

    a. Medium voltage power cables 4mm2 aluminum

    b. M.V. control cables 2.5mm2 copper

    c. Lighting / convenience receptacles 2.5mm2 copper

    All multi-core control cables shall have 10% spare cores subject to minimum of 1 core.

    The cables shall be sized based on the max. Continuous load current, the voltage drop, system voltage and

    short circuit with-stand criteria. Besides the derating due to ambient air temp., ground temperature grouping

    and proximity of cables with each other, thermal resistivity of soil, etc. shall have to be taken into account.

    All supporting steel structures shall be painted before laying of cables.

    3.2.2 Lighting System

    Supply, erection, testing and commissioning of all equipments/materials required for the lighting of

    switchyard/control room, borewell including preparation of lighting layout drawings/panel schedule etc. is in

    the contractors scope. The work shall conform to the enclosed erection specification for lighting.

    Fluorescent lighting shall be limited to the Sub-station building while HPSV lights shall be used for

    switchyard. Post top lantern type fitting shall be used for gate lighting. The following minimum illumination

    levels shall be maintained for various areas:

    Switchyard 50 lux.

    Battery room 150 lux.

    Control & Relay Panel room 150-300 lux.

    Maintenance factor of 0.7 shall be considered for outdoor and indoor areas respectively. Coefficient of

    utilization shall be calculated as per fixture type and areas. Separate lighting Masts/Poles shall be used if

    required. Lighting system shall include normal and critical lighting. Normal lighting shall operate on 240V AC

    and critical lighting on 110V DC supply. Critical lighting shall be located at strategic locations including the

    Exit points, Control and Switchgear rooms, etc. and shall be switched on automatically in the event of total

    AC supply failure. All outdoor lighting shall be controlled by means of synchronous timer with manual

    overriding.

    The lighting system shall comprise of lighting distribution board, lighting panels, fixtures, switches, junction

    boxes, 3 pin 15A convenience socket outlets, etc. The lighting distribution system shall be 415V, 50Hz, 3

    phase and neutral from lighting distribution board. Lighting fittings shall be fed across any one of phases

    and neutral i.e. 240 volts to balance the load on three phases as much as possible. Each branch circuit shall

    carry a load not more than of max. 10 light points. For power sockets, max. two nos. shall be wired in a

    circuit. Wiring between lighting panel and lighting fixtures shall be with 3 core PVC insulated 2.5mm2

    copper

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    15/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-10

    conductor, armored cable for switchyard and with PVC insulated 2.5 mm2

    copper wire within canceled

    conduit in building.

    Lighting panels shall be provided with miniature circuit breakers for control and protection of circuits and

    ELCB for incomer. A minimum of 20% of miniature circuit breakers of each board shall be left as spares.

    MCBs shall not be loaded more than 80 percent of rated capacity. Cables feeding distribution board shall be

    sized taking into consideration future load on spare feeders. The contractor shall furnish design calculations,

    lighting layout drawing indicating the locations of lighting fixtures, cables runs, conduit, mounting height and

    mounting details for Employers review.

    3.2.3 Earthing system Earthing system shall conform to following particular standards: IEEE-80 Guide

    for safety in AC substation grounding.

    Size and material specifications

    3.2.3.1 Earth Electrode

    The earth electrodes shall be made from 40 mm dia. 3 meter long G.I. Pits accordance with IS : 3043.

    3.2.3.2 Earthing Conductor

    Cross-section of earthing conductor shall be designed to prevent fusing of conductor and deterioration of

    joint under most adverse conditions of fault. The same shall be determined by consideration of potential

    difference and temperature rise and to meet the regulations of Electricity Regulations. Aluminum/ G.I.

    earthing conductors shall be used.

    3.2.3.3 Earthing System

    The entire installation shall be done in accordance with standards mentioned herein. The contractor shall

    carry out any changes desired by the electrical inspecting authority or the Employer, in order to make the

    installation conform to electricity rules at no extra cost. Contractor shall prepare as build drawings showing

    locations of earth electrodes, earth conductors and earth connections to various equipments. Excavationand refilling of earth, if necessary for laying the underground earth bus shall be the responsibility of

    contractor. Contractor shall measure the earth resistivity of soil. In the evaluation of earth resistivity four or

    five test locations shall be chosen to cover the whole site. This no. shall be increased if the test results

    obtained shows a significant difference. The tests shall be conducted during the dry season. The earthing

    system shall be designed to have a low impedance to ground and a current carrying capacity consistent with

    the fault current. Earthing system shall also effectively control the touch and step potentials and limit the

    minimum potential gradients to within safe limits at all points of the whole switchyard.

    The main earth loop shall be laid at the depth of min. 600 mm below grade level. Wherever cable trenches

    are available, the earth lead shall be laid in the trenches and shall be firmly cleated to the walls, when run in

    concrete lined trenches. The earthing strip shall be protected against mechanical damage. Joints and

    tapings in the main earth loop shall be made in such a way that reliable and good electrical connection is

    permanently ensured. All joints below ground shall be brazed / bolted and shall be suitably protected. All

    joints above ground shall be by means of connectors / lugs, and shall be suitable to resist corrosion.

    Test disconnect facilities shall be provided for the earth pits to check their earth resistance periodically.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    16/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-11

    The switchyard earthing shall be made up of a lattice grid. Cross-section of earthing conductor shall be

    designed to prevent fusing of conductor and deterioration of joint under most adverse conditions of fault.

    Duration of earth fault current should be taken as 3 seconds. Earthing mat of a finer mesh shall be provided

    just below the operating handles or mechanisms, junction boxes and other accessible areas buried 600mm

    below the grade level.

    The method of earthing switchyard fence has to be considered from the view point of touch and step

    potentials in the area outside the fence. The earth may be extended (if required) beyond the fence, so as to

    ensure that the area in the vicinity of the substation fence is safe if somebody happens to touch the fence

    under fault conditions.

    All electrical equipments are to be double earthed by connecting two earth strips conductor from the frame

    of the equipment to the main earth grid. There shall be provision for earthing the following:

    The neutral point of each transformer shall be earthed by not less than two separate and distinct

    connections with earth having its own electrodes, which in turn shall be interconnected with station

    earthing mat.

    Equipment frame work and other non-current carrying parts.

    All extraneous metallic frame work not associated with equipment.

    Each lightning arrestor in turn should have independent earth which should in turn be connected to the

    station earthing grid.

    All switchgear and their earth buses.

    Non-current carrying metallic parts of electrical equipment such as Switchgear, switch rack, panels

    boards, motor control centers, lighting panels, instrument panels, push button stations, etc.

    All fences / enclosures housing electrical equipment.

    All steel structures, rails, etc. including bonding between sections.

    Shield wire / lighting mast.

    Structural steel

    The electrodes and grid conductor shall have a clean surface not covered by paint, enamel, grease or other

    materials of poor conductivity. All hardware like bolts, nuts, washers, etc. used for earthing installation shall

    be hot dip galvanized or zinc passivated. Spring washers shall be used for all earth connections of

    equipment having moving parts or vibrations.

    Lighting fixtures shall earth through the extra core provided in the lighting cable for this purpose.

    The switchyard shall be shielded against direct lightning strokes by provision of lightning masts. The

    lightning masts may be placed so as to provide coverage to the entire switchyard equipment.

    The earthing work shall conform to the erection specification for earthing.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    17/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-12

    3.2.3.4 Testing

    Earthing systems / connections shall be tested as below:

    I) Resistance of individual electrodes shall be measured after disconnecting it from the grid.

    ii) Earthing resistance of the grid shall be measured after connecting all the electrodes to the grid.

    iii) The resistance to earth shall be measured at the following:

    a) At each electrical system earth or system neutral earth.

    b) At each earth provided for structure lightning protection.

    c) At one point on each earthing system used to earth electrical equipment enclosures.

    d) At one point on each earthing system used to earth wiring system enclosures such as metal conduits

    and cable sheath or armor.

    e) At one point on each fence enclosing electrical equipment.

    Measurement shall be made before connection is made between the ground and the object to be grounded.

    3.2.3.5 GENERAL REQUIREMENTS

    The electrical contractor shall furnish necessary meters, instruments, temporary wiring and labor to

    perform all required tests, adjustments and wiring of all equipment installed and / or connected under

    this contract including electrical equipment furnished by others, to determine proper polarity, phasing,

    freedom from grounds shorts and operation of equipments, meters, relays, etc. All testing instruments

    shall be calibrated and certified for accuracy by competent authority.

    Inspection and testing shall be carried out to ensure that all equipment and materials has beeninstalled as required and / or recommended by the equipment manufacturers and as per the latest

    relevant Indian Standard Specifications, Codes, Indian Electricity Rules, requirements of Fire

    Insurance, Chief Electrical Inspector and any other authorities having jurisdiction. The installation

    must pass all inspection and will be subject to the approval of the Engineer-in-charge.

    Before the electrical facilities are placed in operation, the contractor shall make suitable tests to

    establish to the satisfaction of the Engineer-in-charge that all equipment, devices and wiring have

    been correctly installed, are in satisfactory condition and will operate as intended and as

    recommended by the equipment manufacturers.

    All tests shall be performed by or under the direct supervision of the men qualified for carrying out

    inspection and testing.

    The Engineer-in-charge reserves the right to witness all tests, and he shall be notified two weeks

    before the tests are to take place. Engineer-in-charge reserves the right to approve the test results

    before circuits or equipment will be energized for the first time.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    18/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-13

    If motors, record low insulation resistance then they must be dried to obtain the required insulation

    resistance values. Approval of the drying methods shall be obtained from Engineer-in-charge before

    applying heat.

    All results of the tests shall be recorded on prescribed test data sheets. All tests described herein

    shall be recorded on forms provided or agreed upon by Engineer-in-charge. Test reports shall

    include, for each test, the date of performance and name of the person in charge of the test.

    Before starting the tests, a visual inspection of the material / equipment is to be made to determine

    that all components are installed as per drawings and in a neat and workman-like manner and that, in

    general, the equipment is ready for testing.

    In case of fault, the contractor shall isolate the fault and shall take necessary steps to eliminate the

    fault to the satisfaction of Engineer-in-charge. All defects through faulty workmanship of contractor or

    equipment and material supplied by him shall be corrected or replaced at his own expense.

    Before commencement of any test, all equipment shall be thoroughly cleaned by blower and checked

    for proper and rigid connection of termination, fixing of foundation bolts, etc.

    On award of contract, contractor shall submit all formats for tests to be conducted on each

    equipment/system for those to be recorded in accordance with these specifications, for approval to

    the Engineer-in-charge / Consultant.

    3.3 TEST PROCEDURES.

    3.3.1 POWER TRANSFORMER

    General

    Check all units for proper rating and size. Inspect earth connections, terminations on E.H.V, H.V. & L.V.

    sides. Checks for oil leaks at all fittings and connections. Check for thermometer, breather and other safety

    devices. Check oil level and color of silica-gel.

    Tests

    1. Winding insulation resistance shall be measured from primary and secondary windings to earth and

    from primary to secondary winding. The winding which is not under test, shall be earthed during the test.

    2. The insulation resistance should be measured by at least 1000 Volts megger. Every time the voltage

    should be applied for 1 minute. While taking the insulation resistance measurements, the value of

    insulation resistance shall not be less than 400 Mega ohms at 30 Degree C and 200 Mega ohms at 40

    Degree C for HV winding and 50 Mega ohms at 30 Degree C and 25 Mega ohms at 40 Degree C for LV

    winding. If the values obtained are less than the above figures, drying out process shall be necessary.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    19/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-14

    3. Measure the dielectric strength of transformer oil in accordance with IS: 335. The oil should withstand

    at least 40KV for 1 minute when tested.

    4. Test operation of buchholtz relay in accordance with Manufacturers instructions.

    3.3.2 HIGH VOLTAGE SWITCHGEAR

    Before switchgear is energized, the insulation resistance of each bus shall be measured

    from phase to phase and from phase to earth. Measurements shall be repeated with circuit

    breakers in operating position and contacts open. Each test shall be held until constant

    reading is obtained. Minimum time shall be ten seconds. Minimum megger reading shall be

    10 megohms.

    Before switchgear is energized, the insulation resistance of all D.C. control circuits shall be

    measured from phase to earth. Minimum acceptable value shall be 1 Megohm.

    Each adjustable protective relay shall be set, calibrated and tested by using a cycle counter,load box, ammeter, and voltmeter as required or by using a suitable relay test set having

    good wave form. Settings, calibration points, and test points shall be in accordance with

    values given by the approved relay settings for the job.

    Test all current transformer secondary circuits by applying current (thro secondary injection

    test) to transformer secondary windings and verifying that relay(s) and/or meter(s) operate

    properly.

    Test all potential transformer secondary circuits by applying voltage to potential transformer

    secondary winding and verifying that relay(s) and/or meter(s) operate properly.

    Test all the circuit breakers for proper interlocking operation. The sequence of interlocking

    shall be as indicated on single line diagram.

    Test the operation of tie breakers / bus couplers.

    The following tests shall be performed on all circuit breakers before they are operated :-

    Contact alignment shall be checked and adjusted where necessary in accordance with

    manufacturers instructions.

    Each circuit breaker shall be drawn out of its cubicle and shall be closed manually, and then

    its insulation resistance shall be measured from phase to phase and from phase to earth.

    All adjustable direct acting trip devices shall be set using values given in the approved relay

    settings for the job.

    Before switchgear is energized, the following tests shall be performed on each circuit

    breaker in its test position :-

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    20/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-15

    Close and trip circuit breaker from its control switch, push button, or operating handle.

    Test operation of circuit breaker latch and check switch, where provided.

    Test proper operation of lockout device in the closing circuit, where provided, by simulating

    conditions which would cause a lockout to occur.

    Trip breaker by manual operation or by applying current or voltage to each of its associated

    protective relays.

    All automatic control operations and interlocks shall be tested for correct operation.

    After completion of tests, all test results shall be recorded in standard format approved by

    Engineer-in-charge, witnessing site engineer and contractors representative.

    All test reports shall indicate the details of the instruments used for test with date and time of

    test.

    After commissioning of the equipment, all measuring and indicating instruments to be

    checked properly for operation. Any improper operation of these indicating lamps /

    instruments shall be corrected by checking fuse / connections, polarity, etc. If still these are

    found to be not in working condition, the same should be reported to the Engineer-in-charge

    for suitable action for replacement by the supplier.

    3.3.3 MEDIUM VOLTAGE SWITCHGEAR

    MAIN L.T. SWITCH BOARD / POWER CONTROL CENTRE

    Before switchgear is energized, the insulation resistance of each bus shall be measured

    from phase to phase and from phase to earth. Measurements shall be repeated with

    circuit breakers in operating position and contacts open. Each test shall be held until

    constant reading is obtained. Minimum time shall be ten seconds. Minimum megger

    reading shall be 10 megohms.

    Before switchgear is energized, the insulation resistance of all D.C. control circuits shall

    be measured from phase to earth. Minimum acceptable value shall be 1 Megohm.

    Each adjustable protective relay shall be set, calibrated and tested by using a cycle

    counter, load box, ammeter and voltmeter as required or by using a suitable relay testset having good wave form. Settings, calibration points and test points shall be in

    accordance with values given for the approved relay settings for the job.

    Test all current transformer secondary circuit by applying current (thro secondary

    injection test) to transformer secondary windings and verifying that relay(s) and/or

    meter(s) operate properly.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    21/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-16

    Test all the relevant circuit breakers for proper interlocking operation. The sequence of

    interlocking is as indicated on single line diagram.

    Test the operation of tie breakers / bus couplers.

    The following tests shall be performed on all circuit breakers before they are operated :-

    Contact alignment shall be checked and adjusted where necessary in accordance with

    manufacturers instructions.

    Each circuit breaker shall be drawn out of its cubicle and shall be closed manually, and

    then its insulation resistance shall be measured from phase to phase and from phase to

    earth.

    All adjustable direct acting trip devices shall be set using values given in the approved

    relay settings for the job.

    Before switchgear is energized, the following tests shall be performed on each circuitbreaker in its test position :-

    Close and trip circuit breaker from its control switch, push button or operating handle.

    Test operation of circuit breaker latch and check switch, where provided.

    Test proper operation of lockout device in the closing circuit, where provided, by

    simulating conditions which would cause a lockout to occur.

    Trip breaker by manual operation or by applying current or voltage to each of its

    associated protective relays.

    All automatic control operations and interlocks shall be tested for correct operation.

    After completion of tests, all test results shall be recorded in standard format approved

    by Engineer-in-charge, witnessing site engineer and contractors representative.

    All test reports shall indicate the details of the instruments used for test with date and

    time of test.

    After commissioning of the equipments, all measuring and indicating instruments to be

    checked properly for operation. Any improper operation of these indicating lamps /

    instruments shall be corrected by checking fuse / connections, polarity, etc. If still theseare found to be not in working condition, the same should be reported to the Engineer-in-

    charge for suitable action for replacement by the supplier.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    22/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-17

    3.3.4 H.T. CABLE

    A D.C. high voltage test shall be made, after installation, on HT XLPE cables.

    Test data shall be noted for record purposes. Measure values of leakage current versus

    time.

    The d.c. high voltage tests shall be performed in accordance with following :-

    Cables shall be installed in final position, with all through splices complete. Terminations

    shall be kept unfinished so that motors, switchgear, transformers, etc. are not subjected

    to the test voltage. However, insulation shall be penciled and otherwise prepared for

    completion of the termination of the cable, including making up & grounding of stress

    cone for shielded cable.

    Where potheads are employed, all internal work in making up the pothead shall be

    completed including filling. Pothead insulators shall be clean and dry.

    The test voltage, duration of test, and test procedure shall be in accordance with IS :

    1255.

    3.3.5 L.T. CABLE

    A megger test shall be made for continuity and proper end-to-end connection and

    correct termination after installation, on all feeder cables including motor feeder cables.

    Record test data between phase to phase and phase to earth.

    The test voltage, duration of test and test procedure shall be in accordance with IS :

    4288.

    3.3.6 WIRING

    Before energizing, the insulation resistance of every circuit shall be measured from

    phase to phase, from phase to neutral and phase to earth.

    The insulation resistance of the circuits noted below, shall be measured as follows :-

    Motor feeders : with motors disconnected, measure insulation resistance from load side

    of circuit

    Breakers or contactors.

    Motor control circuits: With push buttons and over current devices connected, measure

    insulation resistance from phase to earth.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    23/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-18

    Lighting feeders: Measure insulation resistance with circuit breakers or switch-fuse units

    on panel boards connected but with lighting branch circuit breakers or switches open.

    Lighting branch circuits: Measure insulation resistance after all lamp holders,

    receptacles, fixtures, etc. are connected but before lamping.

    Where splices or terminations are required in circuits rated above 600 Volts, measure

    insulation resistance of each length of cable before splicing and/or terminating. Repeat

    measurements, after splices and/or terminations are complete.

    Measure the insulation resistance of buried cable circuits before cable trenches are

    backfilled. Repeat measurements after backfilling.

    Test light intensity of each room by light intensity meter at working height and record the

    same.

    All receptacles shall be tested for correct phase sequence and by test lamp for operation

    of switch and continuity of earthing.

    3.3.7 INSULATING LIQUID DIELECTRIC TEST

    For test of the dielectric strength of insulating liquid or oil in transformer or reactor, test sample of liquid shall

    be drawn from equipment after filling. In some cases, a test also shall be made with samples drawn from the

    liquid container before the equipment is filled. Tests shall be carried as per IS : 335.

    3.3.8 EARTHING

    Specifications

    Earthing shall be carried out as per IS Code of Practice: 3043 and as shown in the relevant drawings.

    General Inspection

    Check that earthing system is installed as per drawings.

    Check that all connections are tight and connections are protected from mechanical

    injury.

    Testing

    The resistance to ground shall be measured at the following locations :

    The resistance of the system/neutral earthing should be maintained preferably at less

    than 1 Ohm.

    At each earthing point provided for lightning protection, the earth resistance shall

    preferably not exceed 1 Ohm.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    24/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    3-19

    At any one point of each system used to provide earthing to electrical equipment

    enclosures, resistance shall not preferably exceed 1 Ohm.

    Measurements shall be done before connection is made between the earth and the

    object to be earthed.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    25/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-20

    4.0 CONTRACTORS SCOPE OF WORK

    All supervisory, skilled and unskilled labor, materials other than free supply items and testing andcommissioning of the installation are part of the scope of this tender.

    Contractor shall include in the price, cost of supply, installation and testing and commissioning of the entire

    system, including materials and labor, within his scope. He will not ask for any extra cost from the client at

    later date in respect of such items implicitly covered in the scope of work.

    The provision of all testing instruments / kits for testing and commissioning of the system shall be arranged

    by the contractor as a part of his scope of work.

    Drawings pertaining to the installation shall also be got approved by the contractor from the Licensing

    Authorities / Electrical Inspector as part of the scope of work.

    4.1 CHANGE IN SCOPE OF WORK

    Owner shall be free to alter, add to or delete any part of the job without any compensation to the contractor,

    in case the contractor fails to provide sufficient labor / materials under his scope for the execution and

    completion of the work on schedule as per owners assessment.

    4.2 SET OF DOCUMENTS / INFORMATION TO BE PROVIDED BY CONTRACTOR.

    Xerox copy of valid electrical contractors license for the area / State of the Project.

    List of qualified engineers with designation and work experience, deployed at site for

    execution and supervision.

    Field quality assurance plan with time schedule for each activity of electrical installation

    work.

    Samples / technical details of equipment / materials to be supplied by the contractor.

    List of construction / working drawings to be submitted for approval of local Statutory

    Authority.

    The contractor shall prepare a comprehensive erection schedule and submit the same to the Purchaser for

    approval. The erection schedule, so finalized, shall update every month, submit it to the Engineer-in-charge

    and shall inform him the progress on all activities falling on the schedule for the next reporting date.

    The contractor shall depute his team comprising qualified and experienced engineers together with

    adequate skilled, semi-skilled and unskilled workmen to the site for carrying out the erection work. The

    contractor would ensure presence of adequate staff required to keep the required pace at all times as per

    the schedule of completion. Contractor shall make available qualified engineers for placing the equipment in

    operation and carrying out the necessary tests till the completion of all works, commissioning/start up, trial

    runs and handing over of the plant. The conduct required for the contractors men is specified below.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    26/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-21

    It is important that the contractor shall employ men known to be reliable and competent for the work in

    general and it shall be the requirement of the contract that the men used on special works shall be

    competent, well trained and trusted employees.

    The contractor shall depute at least one competent representative (whose name shall have previously been

    communicated in writing to the Purchaser) to supervise the erection of the equipment and carrying out the

    work under the contract. This representative shall have full technical capabilities and complete

    administrative and financial powers to expeditiously and effectively execute the work under the contract. The

    contractors representative shall be present at the site at all times when work is in progress and any written

    orders or instructions which the Purchaser may give to the said representative of the contractor shall be

    deemed to have been given to the contractor. The Purchaser shall normally communicate directly with the

    said representative at site.

    Contractor shall furnish to the Purchaser a fortnightly labor force report showing by classifications the

    number of employment records which shall include any reasonable information as may be required by the

    Purchaser. The contractor should also display necessary information as may be required by Statutory

    Regulations.

    None of the contractors supervisors, engineers or laborers may be withdrawn from the work without notice

    being given to the Purchaser, and further no such withdrawals shall be made, if in the opinion of the

    Purchaser It will jeopardize the required pace of progress and/or the successful completion of the work

    The Purchaser shall be at liberty to object to any representative or skilled, semi-skilled or unskilled worker

    employed by the contractor in the execution, or otherwise, who shall misconduct himself or be incompetent,

    or negligent or unsuitable and the contractor shall remove the person so objected to upon receipt of notice

    in writing from the Purchaser requiring him to do so and shall provide in his place a proper and competent

    representative at his own expense within reasonable time.

    Only the contractor, the sub-contractor and their representatives and representatives of the Statutory Public

    Authorities shall have access to the site. No other person should be allowed to the site. No other personshould be allowed to enter the site without the written permission of the Engineer-in-Charge.

    4.3 ENGINEER-IN-CHARGES INSTRUCTION

    The Purchaser may in their absolute discretion from time to time, issue drawings and/or written instructions,

    directions and clarifications, which are collectively referred to as Engineer-in-Charges Instructions in regard

    to:-

    Any additional drawings and clarifications to exhibit or illustrate details.

    Variations or modifications of the design, quality or quantity of work or the additions to or omissions from or

    substitution of any work.

    Any discrepancy in the drawings or between the schedule of quantities and/or specifications.

    Removal from the site of any material brought there by the contractor and the substitution of any other

    material thereof.

    Removal and/or re-execution of any work erected by the contractor.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    27/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-22

    Dismissal from the work of any work erected there-upon.

    Opening up for inspection of any work covered up and amending and making good of any defects.

    4.4 RIGHT OF THE OWNER.

    4.4.1 Discrepancy in Contract.

    The various parts of the contract are intended to be complementary to each other, but should any

    discrepancy apper or any misunderstanding arise as to the interpretation of anything contained therein, the

    explanation of the Purchaser shall be final and binding upon the contractor.

    4.4.2 Right to direct work

    The Purchaser shall have the right to direct the manner in which all works under this contract shall be

    conducted, in so far as is necessary to secure the safe and proper progress and the specified quality of the

    works. All works shall be done and all materials shall be furnished to the satisfaction and approval of the

    /Purchaser.

    Whenever in the opinion of the Purchaser, the contractor has made marked departures from the scheduleof completion or when untoward circumstances force such a departure from the said schedule, the

    Purchaser, in order to ensure compliance with the schedule shall direct the order, pace and method of

    conducting the work, which shall be adhered to by the contractor.

    If in the judgment of the Purchaser, it becomes necessary at any time to accelerate the overall pace of the

    planned erection work, the contractor, when directed by Purchaser, shall cease work at any particular point

    and transfer his men to such other point or points and execute such works as directed by the Purchaser.

    4.4.3 Right to Order Modifications of Methods and Equipment.

    If at any time, the contractors methods, materials or equipment appear to the Purchaser to be unsafe,

    inefficient or inadequate for securing safety of workmen or the public or the quality of work or the rate ofprogress required, he may direct the contractor to ensure safety and increase their efficiency and adequacy,

    and the contractor shall promptly comply with such directives. If at any time, the contractors worki ng force

    and equipment are, in the opinion of the Purchaser, inadequate for securing the necessary progress, as

    stipulated, the contractor shall, if so directed, increase the working force and equipment to such an extent as

    to give reasonable assurance of compliance with the schedule of completion. The absence of such

    demands from the Purchaser shall not relieve the contractor of his obligations to secure the quality and safe

    conducting of the work and the rate of progress required by the contract. The contractor alone shall be and

    remain liable and responsible for the safety, efficiency and adequacy of his methods, materials, working

    force and equipment, irrespective of whether or not he makes any changes as a result of any order or

    orders received from the Purchaser.

    4.4.4 Right to Inspect the Work

    The Purchasers/s representative shall be given full assistance in the form of necessary tools, instruments,

    equipment and qualified operators to facilitate inspection.

    The Purchaser reserves the right to call for certificate of origin and test certificates for all the materials used

    in the erection work.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    28/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-23

    In the event the Purchasers/s inspection reveals poor quality of work/materials, the Purchaser shall be at

    liberty to specify additional inspection procedures, if required, to ascertain the contractors compliance with

    the specifications of erection work.

    Even though inspection is carried out by the Purchaser or their representatives, such inspection shall not,

    however, relieve the contractor of his responsibilities as per the contract, nor prejudice any claim, right or

    privilege which the Purchaser may have, in respect of deficient work resulting from defective or

    unsatisfactory materials or bad workmanship.

    4.5 CONTRACTORS FUNCTIONS.

    The contractor shall provide everything necessary for proper execution of the works, according to the

    drawings, schedule of quantities and specifications taken together whether the same may or may not be

    particularly shown or described therein, provided that the same can reasonably be inferred therefrom, and if

    the contractor finds any discrepancy therein, he shall immediately verbally and in writing refer the same to

    the Purchaser whose decision shall be final and binding on the contractor.

    It is not expected that the work under the contract will be subcontracted. However, in case the contractor

    desires to subcontract a part of the work, in the interest of the project, he shall request in writing to thePurchaser for approval for the same giving full and complete details regarding the proposed subcontractor,

    his experience, etc. Approval from the Purchaser for subcontracting part of the work shall not relieve the

    contractor from any of his obligations and responsibilities under this contract.

    The contractor shall proceed with the work to be performed under this contract in the best workmanlike

    manner by engaging qualified and efficient workers and finish the work in strict conformance with the

    drawings and specifications and any changes/modifications there-of made by the Purchaser .

    If any work is to done at a place other than the site of the works, the contractor shall obtain written

    permission of the Purchaser for doing so.

    The quantities of the various items listed in the Schedule of Quantities are tentative and may vary on either

    plus orminus side during execution. The final quantities of these materials would be based on the Final

    Drawings prepared by the contractor. Cost of supply and installation for the any addition or deletion in the

    quantities will be calculated based on the unit prices as per the order. Further, the contractor shall take back

    any excess materials which he has supplied and not required for the installation.

    The contractor when requested in writing by the Purchaser shall perform extra work and furnish extra

    material not covered by the specifications but forming an inseparable part of the work contracted for, and

    shall be paid extra for all such works at the rates and terms mutually agreed upon. Items not covered by the

    schedule of quantities but similar in nature to the items already covered shall be paid for at rates being

    worked out on the basis of rates for similar items. However, extra items, if any, for which rates cannot be

    derived from the main contract, shall be paid for on the basis of vouchers of cost of materials and labordeployed by the contractor.

    The work shall be carried out as the Purchasers authorized representative may approve from time to time,

    keeping in view the overall schedule of completion of the project. The Purchaser will provide all reasonable

    assistance for carrying out the jobs .Night work will be permitted only with the prior approval of the Engineer-

    in-Charge. Engineer -in-charge may also direct the contractor to operate extra shifts over and above normal

    day shift to ensure completion of the contract as per schedule. Adequate lighting, wherever required, should

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    29/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-24

    be provided by the contractor at no extra cost. The contractor should employ qualified electricians and

    wiremen to maintain these facilities. In case of contractors failure to p rovide these facilities and personnel,

    the Engineer-in-charge has the right to arrange such facilities and personnel and charge the cost thereof to

    the contractor.

    For the materials and equipments being supplied by the contractor, it shall be the responsibility of the

    contractor to have such items covered under insurance. The contractor shall, have to arrange for insurance

    of all his staff (temporary or permanent) and also all the items, brought by him to the site, for executing and

    handing over of the complete job.

    The Purchaser/Engineer-in-charge shall not be responsible for any accident or mishappening, and the

    contractor has to settle the issue. However, on humanitarian ground, the Purchaser/Engineer-in-charge may

    assist in getting medical facilities, if the contractor asks/fails to arrange for it. The expenditure incurred for

    such will be chargeable to the contractor.

    The contractor and his men should honor and observe local rules and administrative orders and should

    cooperate with the Purchaser / Engineer-in-charge in this regard.

    Whenever proper execution of the work under the contract depends on the jobs carried out by some other

    contactors, in such cases, the contractor should inspect all such erection and installation jobs and report to

    the Engineer-in-charge regarding any defects or discrepancies. His failure to do so shall constitute as

    acceptance of the other contractors installation/jobs as fit and proper for reception of his work except those

    defects which may develop due to any discrepancy between the executed work and the drawings.

    It is, however, made clear that appropriate penalty shall be levied in the event of the other dependent works

    getting delayed due to any delay on the part of the contractor in executing the jobs as per agreed schedules.

    The contractor shall extend all necessary help/cooperation to other contractors working at the site in the

    interest of the work.

    Contractor shall carry out final adjustments of foundations, leveling and dressing of foundation surfaces,

    bedding and grouting of anchor bolts, bed plates, etc. required for setting of equipment in proper position.

    The contractor shall be responsible for the reference lines and proper alignment of the equipment. However,

    all minor civil works which form an inseparable part of the installation and erection job like digging trenches

    for laying of cables, conduits and underground pipes, making cutouts in the walls, floors and ceiling for

    pipelines, adjustment leveling, dressing and grouting of foundation bolts and grouting of supports are to be

    carried out by the contractor at no extra cost. The contractor should arrange for laying the supports, cutouts,

    grouting of bolts, etc. when the civil works are in progress, so as to avoid refilling/repair works.

    The damages occurring to civil and other works are to be made good by the contractor at his own expenses.

    4.6 DUTIES OF THE ONWER/ VIS-A-VIS THE CONTRACTOR.

    The equipment and items as listed under the clause of free issue Materials shall be supplied by the

    Purchaser for installation/erection, testing and commissioning by the contractor. Contractor has to make his

    own arrangements for necessary construction water and power.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    30/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-25

    4.6.1 SUPPLY OF TOOLS, TACKLES AND MATERIALS.

    The contractor shall at his own expense provide all necessary erection tools and tackles such as welding

    transformer, generation sets for SS welding, gas welding and cutting sets, chain pulley blocks, cranes,

    portable electric grinders, drilling machines and blowers, electrical testing equipment (megger, multimeter,

    tong tester), crimping tools, pipe bending machines, SS pipe expanders, tap and die sets, ladders and

    scaffolding materials, tripods and rigging materials for installation and unloading/lifting of heavy equipment,etc. A list of such items shall be forwarded to the Engineer-in-charge.

    The contractor shall also provide necessary materials such as anchors, grinding wheels, hacksaw blades,

    taps and dies, drills, hammers, chisels and files, wire brushes, and Consumables (oxygen, acetylene, argon.

    lubricating oils, grease) and cleaning material of every kind not listed above but required for carrying out the

    erection work.

    The above mentioned tools and tackles will remain the property of the contractor but he shall have to obtain

    written permission from the Engineer-in-charge prior to removing such items from the site.

    4.6.2 PROTECTION OF PLANT.

    Except in cases where the Purchasers/s specific permission is applied for and received in writing, no use of

    the Purchasers plant facilities such as cranes, passenger elevators, toilets , showers, workshop tools and

    machines, etc., shall be made by the contractor or his employees.

    The Purchaser shall not be responsible or held liable for any damage to person or property consequent

    upon the use, misuse or failure of any erection tools and equipment used by the contractor or any of his

    subcontractors, even though such tools and equipment may be furnished, rented or loaned to the

    contractor or any of his sub-contractors. The acceptance and/or use of any tools and equipment by the

    contractor shall be construed to mean that the contractor agrees for all responsibilities and all claims for any

    damages resulting from the said use, misuse or failure of such tools and equipment.

    The contractor and his sub-contractors shall be responsible, during the work, for protection of the workwhich has been completed by other contractors. Necessary care must taken to see that no damage to the

    same is caused by his men during the course of execution of their work. All other works completed or in

    progress as well as machinery and equipment that are liable to be damaged by the contractors work shall

    be protected by the contractor, and such protection shall remain and be maintained until its removal is

    directed by the Purchaser. The contractor shall effectively protect all the works from action of weather and

    from damages or defacement and shall cover finalized parts properly, wherever required, for their complete

    protection.

    The work shall be carried out by the contractor without damage to any work and property adjacent to the

    area of his work, to whomsoever it may belong and without interference with the operation of existing

    machines or equipment.

    Adequate lighting at and near all the storage, handling, fabrication, pre-assembly and erection sites for

    properly carrying out the work and for safety and security shall be provided by the contractor at his cost. The

    contractor should adequately light the work area during the night time also. The contractor should also

    engage adequate electricians/wiremen, helpers, etc. to carry out and maintain these lighting facilities. If the

    contractor fails, the Purchaser may provide lighting facilities to the contractor. In any case, the contractor

    shall be liable for all damages and consequential losses arising out of any neglect in this regard.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    31/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-26

    4.6.3 UNLOADING, TRANSPORTATION AND INSPECTION

    The contractor shall be required to unload all materials/equipment from the carriers, received at site after his

    team arrives at site. The contractor shall plan in advance, based on the information received from the

    Purchaser, his requirement of various tools, tackles, jacks, cranes, sleepers, etc., required to unload the

    materials/equipment promptly and efficiently. It is very important that the contractor must take adequate and

    all measures necessary to avoid any damage whatsoever to the equipment at the time of unloading, anydemurrage charges incurred due to the delay in unloading the materials/equipment and releasing the

    carriers shall be charged to the contractors account.

    For providing the manpower for unloading of materials/equipment as explained above, the contractor shall

    not be paid extra amount. Unloading of all the equipment as explained above shall be carried out by the

    contractor alone as per the intimation received from the Engineer-in-charge and the contractor would not

    refuse to unload any equipment during the period when his term is stationed at the site.

    Free-issue material shall also be unloaded and handled by the Electrical Contractor. Contractor shall safely

    transport/ shift the materials/ equipment unloaded by him to the storage area/work site as the case may be.

    All the materials/ equipment received by the Purchaser prior to arrival of the contractor at site shall behanded over to the contractor.

    The materials/equipment shall be carefully unpacked by opening the wooden cases/other modes of

    packaging as the case may be.

    Detailed inventory of various items would be prepared clearly listing out the shortages/breakages/damages

    after checking the contents with respect to the Suppliers packing list; the Purchasers/s Purchase Order

    and approved equipment drawings. The contractor shall also check every equipment for any

    shortage/shortcoming at the time of installation or commissioning.

    All these information/observation of the contractor shall be furnished in the form of INSPECTION REPORT

    to the Purchaser with specific mention/suggestions, which in the opinion of the contractor should be given

    due consideration, and immediate necessary actions would be taken by the Purchaser to arrange for repair

    or replacement well in time and avoid delays due to non-availability of equipment and parts at the time of

    their actual need for erection.

    The protection, safety and security of the materials so taken over from the Purchaser shall be the

    responsibility of the contractor, until they are handed over to the Owner after erection, commissioning and

    testing as per the terms of the contract.

    All the materials/equipments, covered in the scope of erection contract, received at site after erection team

    arrives at site, shall be inspected by the Contractor in the manner as described above within a week from

    the date of receipt, and he shall furnish shortages/damages reports to the Purchaser to enable placement of

    insurance claims. In case Owner/ incurs loss due to the delay in insurance claims, which are attributable to

    the contractor because of their delays in furnishing inspection report, the same shall be charged to the

    contractor.

    The contractor shall keep a check on deliveries of the equipment covered in the scope of the erection work

    and shall advise the Engineer-in-charge well in advance regarding possible holdup in his work due to the

    likely delay in delivery of such equipment /components to enable him to take remedial actions.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    32/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-27

    4.6.4 QUALITY, INSPECTION AND REJECTION OF MATERIAL

    All materials should be used new and should conform to the desired specification/ relevant standards.

    Whenever the country of origin of material used is other than India, if should be specifically brought to the

    notice of the Owner. All relevant technical details and test certificates as well as the literature, in duplicate,

    should be furnished to the Engineer-in-charge. Also, names and addresses of sources should be furnished

    to the Purchaser.

    The Engineer-in-charge shall have free access to the contractors shop at all working hours for the purpose

    of inspection and shall be assisted by the contractor in all respects.

    The contractor shall also arrange to carry out the tests at site as per directions of Engineer-in-charge or as

    per the standard practices wherever felt necessary to ensure quality material. The Engineer-in-charge shall

    reject materials which are found with defects in workmanship, design and not meeting the standards or

    otherwise unsuitable for the purpose intended. Any material rejected shall under all circumstances lie at the

    risk of the contractor from the moment of such rejection till their removal. If such materials are not removed

    by the contractor within reasonable period as may be decided by the Purchaser, these may be disposed off

    at the Contractors risk and account and retains in such portion of proceeds as may be necessary to cover

    any expenses incurred in connection with such disposal. The Purchaser shall also be entitled to recoverhandling and storage charges for the rejected materials which are not removed. This will include cost of

    disposal when necessary.

    If after delivery, acceptance and installation and within the guarantee period, the operation or use of material

    or equipment supplied and installed by the contractor or the material or equipment supplied by the

    Purchaser but installed and commissioned by the contractor, prove to be unsatisfactory to the Purchaser, he

    shall have the right to continue to operate/use such materials or equipments until rectification of defects,

    errors or omissions by repairs or by practical replacement made without interfering with the operation of the

    plant. This may even require replacement of defective materials/components/ equipment by new ones

    whenever found essential.

    4.6.5 STORAGE OF EQUIPMENT

    The Contractor is responsible for the proper storage and maintenance of all materials/equipment under his

    custody. He shall take all necessary steps for frequent inspection of the equipment/materials stored as well

    as the erected equipment until the same are taken over by the Purchaser. Following procedure shall apply

    for the same:-

    The Contractors Inspector shall check the stored and the installed equipment/materials to observe signs of

    corrosion, damage to protective coating to parts, open ends in pipes, vessels and equipment, insulation

    resistance of electrical equipment, etc. He shall arrange a coat of protective painting whenever required. A

    record of all observations made on equipment and defects noticed shall be promptly communicated to the

    Purchaser and his advice shall be taken regarding the repairs/rectifications. The Contractor shall thereupon

    carry out such repairs/rectifications. The Purchaser reserves the right to get this done by other competent

    agencies at the Contractors responsibility and risk and the entire cost for the same shall be recovered from

    the Contractors bills.

    The Contractors Inspector shall also inspect and provide lubrication to the assembled equipment. The

    shafts of such equipment shall be periodically rotated to prevent rusting as well as to check free movement

    of the same.

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    33/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-28

    The Inspector shall check for any signs of moisture or rusting in all equipment.

    If commissioning of equipment is delayed during such period after installation of the equipment, the

    contractor shall carry out all protective measures suggested by the Purchaser.

    Adequate security measures shall be taken by the Contractor to prevent theft or loss of materials handed

    over to him by the Purchaser. The Contractor shall carry out periodical inventory checks of the materialsreceived, stored and installed by him and any loss noticed shall be immediately reported to the Purchaser. A

    proper record of these inventories shall be maintained by the Contractor. The Contractor should not sell,

    assign, mortgage, hypothecate or remove equipment or materials which have been installed or which may

    be necessary for completion of the work, without the written consent of the Engineer-in-charge.

    Suitable grease recommended for protection of surface against rusting (refined from petroleum oil with

    lanclin at minimum 70 deg. and water in traces) shall be applied over all equipment as required once in

    every six month by the Contractor at no extra cost.

    All the necessary items/goods required for protection as described above shall be arranged by the

    Contractor and no extra cost is payable in this regard by the Purchaser.

    4.6.6 APPROVALS

    The contractor shall obtain the necessary approvals of the Factory Inspector, Electrical Inspector, Weights &

    Measures Inspector, Explosive Inspector and any other State and local Authorities as may be required.

    All the necessary details, drawings, submission of application and proforma will be furnished by the

    contractor to the Owner/ for verification and signature.

    The necessary application duly filled-in together with the prescribed fees shall be submitted to the

    appropriate Authorities by the Contractor on behalf of the Purchaser. However, all actual statutory

    prescribed fees paid by the Contractor shall be reimbursed by the Purchaser upon production of the

    receipts/vouchers.

    Wherever necessary or required, the Contractor shall furnish the necessary certificates of tests and/or

    inspection, etc. from the appropriate Authorities as per IBR, IER and other prevailing Statutory Regulations

    at no extra cost.

    All remarks and suggestions necessary as suggested by the Authorities mentioned above shall be carried

    out by the Contractor to the entire satisfaction of the required Authorities and no extra cost shall be payable

    in this regard to the Contractor. However, if there are major modifications needed in the design of

    buildings/equipment/services not stipulated in the Contract, the Contractor would be paid to carry out the

    same, as mutually agreed upon.

    4.6.7 REVIEW AND COORDINATION OF ERECTION WORK.

    The Contractor shall depute senior and competent personnel to attend the site coordination meetings that

    would generally be held at the site every month/fortnight. The Contractor shall take necessary action to

    implement the decisions arrived at such meetings and shall also update the erection schedule. In case of

    lag in the progress, the Contractor shall act suitably to make up for the lag. If the contractor does not

    commence/complete the entire job/ section of job within 2(two) weeks from the programmed schedule of

  • 7/30/2019 Electrical Tender Document- 10MW CHADIYANA Package 20 and 9

    34/56

    LSEPL/003 Electrical Department

    E:\RAHUL\Technical Specifications for PRS\NEW FORMAT TECH SPEC\15MW Chadiyana\Electrical Tender Document- 10MW CHADIYANA package 20 and 9.doc

    28 August 2011 SAVE

    4-29

    commencement/completion, the Purchaser shall be free to deploy their own staff/agencies to

    commence/complete the job entirely at the risk, responsibility and cost of the Contractor.

    The Contractor shall be required to provide unskilled, semi-skilled and skilled laborers to carry out certain

    jobs at the site as per the requirement of the Purchaser which do not from a part of the erection contract. In

    such cases, the Contractor will be paid extra based on the

    4.7 MISCELLANEOUS RESPONSIBILITIES

    4.7.1 Civil foundation

    All civil foundations required and other civil work required if any, will be provided by the Purchaser.

    However, during construction, if any foundation is damaged, the Contractor shall repair the same with no

    extra charge. minor grouting after structure installation is also in the scope of contractor with Gp2 grade

    cement.

    4.7.2 Modifications of work

    The Contractor shall