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Transcript of Presentation of CIGRE activities on Power Transformers C ... · Presentation of CIGRE activities on...
1
CONSEIL INTERNATIONAL DES GRANDS RESEAUX ELECTRIQUES
INTERNATIONAL COUNCIL ON LARGE ELECTRIC SYSTEMS
STUDY COMMITTEE A2 TRANSFORMERS
Presentation of CIGRE activities
on Power Transformers
C. Rajotte (CA)
Chairman SC A2 "Transformers"
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The Transformer Committee (SC A2)Scope
Design, construction, manufacture and operation for allkinds of power transformers, including industrial , DCconverters and phase-shift transformers and for all types ofreactors and transformer components (bushing, tap-changer…)
In the past ( known as SC12 ) activities were focussed ondesign problems related to the rapid increase of ratedvoltage and power
Today's SC A2 Key Domains
Chairman: Claude Rajotte (CA)
Secretary: Patrick Picher (CA)
Design,
manufacturing
& testing
Specifications,
procurement &
economics
Operation,
reliability, safety
& environment
Maintenance,
diagnostics,
monitoring,
& repair
Life
cycle
Tra
nsfo
rmer
tech
no
log
y
Tra
nsfo
rmer u
tilisatio
n
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Present SC A2 Activities
• 24 regular members
• 19 observer members
• 10 WG's and 5 JWG's
• More than 350 experts from more than 40 countries
• 5 AG’s
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Present SC A2 Working Groups
WG A2.42 - Guide on transformer Transportation (A. Mjelve/NO)
• Typical conditions/forces during transport
• Specifications and design review
• Requirements on transportation issues
WG A2.43 Transformer bushings
reliability (A. Mikulecky/HRvatska)
• Bushing failure definition
• Failure mechanisms for OIP, RBP, RIP
• Bushings failure rate
• Predicted life time, maintenance,
diagnostic
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Present SC A2 Working Groups
WG A2.45: Transformer Failure Investigation
and post-mortem Analysis (M.C. Lessard/CA)
• Important information to collect
• Availability and significance of design data
• Documentation during the dismounting
• Paper sampling: how, where, precautions
JWG A2/D1.46: Field experience with transformer solid insulating ageing markers (R. Mertens/BE)
• Field cases: correlation between chemical markers and DP
• Design information relevant to ageing markers models
• Consideration of operation and maintenance records
• Influence of oil sampling conditions (ex: temperature)
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Present SC A2 Working Groups
JWG D1/A2.47: New frontiers of Dissolved Gas Analysis (DGA) interpretation for power transformers and their accessories (M. Duval/CA)
• Review progress in the field of DGA
• Significance of CO, CO2 and CO2/CO for detecting paper involvement in faults
• Case studies and suggestions for typical problems and actions initiated by DGA
interpretation
WG A2.49: Condition Assessment of Power Transformers (P. Cole/AU)
• Review existing CIGRE documents and literature
• Determine key parameters and how these parameters
can be combined to determine health index
• Consideration should be given to both
deterministic and probabilistic methods.
• Provide details of health indexes/condition
assessment tools currently in use
IMPACT RISQUES
9
8 XX ÉLEVÉ
7 XX XX %
6
5 FORT
4
3 XX MOYEN
2 XX XX
1 FAIBLE
0 1 2 3 4 5 6 7 8 9 PROBABILITÉ
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Present SC A2 Working Groups
WG A2.50: Effect of the distributed energy sources and consequent
induced reverse power flow (step up) on transmission and
distribution transformers (J.C. Riboud/FR)
• Effect of step up operation on transformers that
were not designed for this purpose.
• Effect on flux density, temperature rise, noise
and other performances
• Possible tap changer control problems
• consequences for core flux and voltage regulation
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Present SC A2 Working Groups
JWG A2/D1.51: Improvement to Partial Discharge Measurements for
Factory and Site Acceptance Tests of Power Transformers (S. Coenen/DE)
• Discussion and Comparison of given methods in
international standards
• Discussion and Evaluation of alternative methods
• Recommendations for improved PD Factory/Site
Acceptance Tests
JWG A2/C4.52: High-frequency transformer models for non-
standard waveforms (B. Gustavsen/NO)
• Provide guidelines and recommendations for the generation
of transformer models for simulation of high-frequency
transient overvoltages that can occur in actual service.
• Define minimum requirements that models supplied by
manufacturers to customers must comply with for including
the transformer model in network studies.
• Provide benchmark examples of models applied in simulation
of transformer-network transient interactions using white-box
and black-box models.
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WG A2.53: Objective interpretation methodology for the mechanical
condition assessment of transformer windings using Frequency Response
Analysis (P. Picher/CA)
Present SC A2 Working Groups
JWG A2.54: Power transformer audible noise requirements (C. Ploetner /DE)
• Review of the state-of-the-art of quantitative
interpretation methodologies.
• Use of high frequency transformer modelling, real
case studies or a combination of both.
• Discuss the applications for such methodologies
and make recommendations for best practices
and possible standardisation.
• Description of basic sound development mechanisms -
distinguish between no-load and load condition and
cooling system.
• Development of sound level ranges for all three
components per transformer class. 1Ɵ/3Ɵ/50Hz / 60Hz
• Summary information on sound mitigation (mounting,
panels, enclosures, walls around units)
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WG A2.55: Life Extension of oil filled Transformers and Shunt
Reactors (P. Mueller/CH)
Present SC A2 Working Groups
JWG A2.56: Power transformer efficiency (Zarko Janic/DE)
• Define means to extend service life of a
unit which is aged but in good enough
condition while ensuring the required level
of reliability at a targeted cost;
• Mitigation solutions to keep a failing unit
in service until a planned replacement.
• Economic and environmental impact of regulations on efficiency
• Transformer losses and strategies for their optimization
• Loss level specifications and loss evaluation used in tenders by utilities
• Experience with energy efficiency improvement, regulation and technology.
• Impact of higher efficiency on transportability of transformers
• Cost/benefit analysis for further efficiency improvement
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WG A2.57: Effects of DC Bias on power transformers (D. Susa/NO)
Present SC A2 Working Groups
• State of the art (phenomena, sources, application to transformer, case
studies, scenarios)
• Effect on power transformers (harmonic generation, VAr
consumption, noise, losses, temperatures/overheating, failure modes)
• Calculations, modelling, model verification
• Requirements for transformer specification and design review
• Methods to prove the withstand capability
• Design and technology susceptibility
Recent CIGRE SC A2 BROCHURES
Scope Ref Year
Transformer Thermal Modelling 659 2016
Technology & Util. of Oil Insul. HV Sh. Reactors 655 2016
Oil conductivity under DC condition 646 2016
Transformer Reliability Survey 642 2015
Guide on Transf. Intelligent Condition Monitoring 630 2015
Copper Sulphide Long Term Mitig.&Risk asses. 625 2015
Transient Interac. Transformers&Power System 577 2014
Guide for Specifications 528 2013
Guide for Design Review 529 2013
Guide for Factory Capability Assessment 530 2013
Guide for Fire Safety 537 2013
Guide on Transformer Maintenance 445 2011
HVDC Tr. – Test, ageing, reliability in service 406 2010
HVDC Tr. – Guidelines for design review 407 2010
Experience in service with new insulating liquids 436 2010
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Recent and Future SC A2 Sessions & Colloquium
2014 Paris Session
- Best practices for transformer asset management
- Transformers for specialized applications
- Field experience with the use of non-conventional materials and technologies
2015 Shanghai Colloquium
- EHV/UHV and EVHDC/UHVDC Transformers and its components
- Equipment technologies for substations of the future and Smart Grid - in
collaboration with SC A3 and SC B3
- Making the Best use of the Existing transformer fleet
2016 Paris Session
- Advances in transformer diagnostic and monitoring
- EHV / UHV and EHV DC / UHV DC Transformers and their components
- Transformer windings
2017 Cracow Colloquium
Subjects to be determined
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Thank you for your attention
www.cigre-a2.org