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CONSEIL INTERNATIONAL DES GRANDS RESEAUX ELECTRIQUES INTERNATIONAL COUNCIL ON LARGE ELECTRIC SYSTEMS

STUDY COMMITTEE A2 TRANSFORMERS

Update on CIGRE activitieson Power Transformers

IEEE Munich Meeting 031813

Raj Ahuja

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The Transformer Committee (SC A2)

Scope : Design, construction, manufacture and operation for all kinds of power transformers, including industrial , DC converters and phase-shift transformers and for all types of reactors and transformer components (bushing, tap-changer…)

In the past ( known as SC12 ) activities were focussed on design problems related to the rapid increase of rated voltage and power

Today, the two Strategic Directions for A2 future activities are :• Services to Customers ( Reliability, Life management,

Economics, Tutorials, ...)• Technology Issues (Safety, New technologies and New

concepts, Electrical environment, Pre-standardisation work, ...)

Chairman: Claude Rajotte (CA)Secretary: Patrick Picher (CA)

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Design, manufacturing &

testing

Specifications, procurement &

economics

Operation, reliability, safety & environment

Maintenance, diagnostics, monitoring,

& repair

Life cycle

Tran

sfor

mer

tech

nolo

gyTransform

er utilisation

SC A2 Key domains

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Present SC A2 Activities

• 24 regular members• 19 observer members• 9 WG's and 3 JWG's • 272 experts from 39 countries• 5 AG’s

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A2 USNC Member – Raj Ahuja ( SPX Transformers Inc.)

Scope : Design, construction, manufacture and operation for all kinds of power transformers, including industrial , DC converters and phase-shift transformers and for all types of reactors and transformer components (bushing, tap-changer…)

In the past ( known as SC12 ) activities were focussed on design problems related to the rapid increase of rated voltage and power

Today, the two Strategic Directions for A2 future activities are :• Services to Customers ( Reliability, Life management,

Economics, Tutorials, ...)• Technology Issues (Safety, New technologies and New

concepts, Electrical environment, Pre-standardisation work, ...)

Chairman: Claude Rajotte (CA)Secretary: Patrick Picher (CA)

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Present SC A2 Working Groups

WG A2-33: Fire Safety – Published in Dec 2012WG A2-36: Guide for Transformer ProcurementWG A2-37: Transformer Reliability SurveyWG A2-38: Transformer Thermal ModellingWG A2.40: Copper sulphide long-term mitigation and

risk assessmentWG A2.42: Guide on transformer TransportationWG A2.43: Transformer bushings reliabilityWG A2.44: Transformer Intelligent Condition

MonitoringWG A2.45: Transformer Failure Investigation and

post-mortem AnalysisJWG A2/C4.39: Electrical Transient Interaction between

transformers and the Power SystemJWG A2/D1.41: Oil conductivity under DC conditionJWG A2/D1.46: Field experience with transformer solid

insulating ageing markers

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Present SC A2 Working Groups

WG A2-33 -Fire Safety (A. Petersen/AU)Guide approved for Publishing in Nov. 2012

- Avoidance of tank rupture- Precaution to fire victim- Precautions to fire origin

WG A2-36 Guide for Transformer ProcurementGuide approved for Publishing in Nov. 2012

(T. Breckenbridge / UK)- Capability assessment of transformer

manufacturers- Evaluation of technical competence and

experience- Review and update of the existing CIGRE A2

documents on procurement

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Present SC A2 Working Groups

WG A2-37 Transformer Reliability Survey(S. Tenbohlen/DE)

• Review all existing national surveys and study different practices ; identify best practices

• Compile and present the information available in these national survey reports

• Make recommendations to improve the situation

WG A2-38 Transformer Thermal Modelling (J. Lapworth/UK)

• Describe the state of the art techniques in transformer thermal modelling to evaluate winding hottest spot as well as hot spots on other metallic parts

• Examples of application of hottest spot direct measurement and best practices

• Recommendation for improvement of standards

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JWG A2/C4.39 - Electrical Transient Interaction between transformers and the Power System(A.Rocha/BR)

- Assess and discuss the different types of electrical transient interaction

- Discuss the general increase in transformer dielectric failures in the system.

WG A2.40 - Copper sulphide long-term mitigation and risk assessment(J. Lukic/RS)

- Method, tools and diagnostic- Metal passivator stability and efficiency- Efficiency of existing on-site oil treatment

Present SC A2 Working Groups

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WG A2.42 - Guide on transformer Transportation (A. Mjelve/NO)- Typical conditions/forces during transport- Specifications and design review- Requirements on transportation issues

JWG A2/D1.41 - Oil conductivity under DC condition (A. Küchler/DE)

- Started under recommendation of WG A2/B4.28

- Review techniques and standards for measurement of conductivity of liquids

- Suggestions for new standards

Present SC A2 Working Groups

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WG A2.44 – Transformer IntelligentCondition Monitoring (C. Dupont/BR)- Conversion of data to relevant info.- Demonstration of benefits- Hardware/software/data integration

WG A2.43 Transformer bushings reliability (A. Mikulecky/HR)

• Bushing failure definition • Failure mechanisms for OIP, RBP, RIP• Bushings failure rate • Predicted life time, maintenance,

diagnostic

-20

-10

0

10

20

30

40

-0,1

-0,05

0

0,05

0,1

0,15

0,2

-10 -5 0 5 10 15 20

Rai

n cu

mul

ativ

e (m

m)

∆Tgδ (%)

Time (hours relative to 2008:05:29-0H00 local time)

Present SC A2 Working Groups

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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)

WG A2.45: Transformer Failure Investigation and post-mortem Analysis (C. Kuen/AT)- Important information to collect- Availability and significance of design data- Documentation during the dismounting - Paper sampling: how, where, precautions

Present SC A2 Working Groups

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Recent Brochures & Future activities

Shunt Reactor – Started in Jan. 2013Transformer health indexSpare transformer policyEfficient and eco-design transformersExperience with utilisation of transformers in FACTs

Recent Brochures Ref YearHVDC Tr. – Test, ageing, reliability in service 406 2010HVDC Tr. – Guidelines for design review 407 2010Experience in service with new insulating liquids 436 2010Guide on Transformer Maintenance 445 2011Guide on Transformer Safety Practices 2012

Future Activities:

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Recent/Future SC A2 Sessions & Colloquium

Paris 2012 Preferential Subjects

Colloquium 9/8 – 9/14/ 2013: Zurich, Switzerland Joint Colloquium A2/C4- Interaction between transformer and the Power

System- Experience with the use of Phase-Shifting

transformers- Network planning in the context of an ageing

transformer fleet

- Transformer for the network of the future - Transformer Eco design / Eco use- Transformer magnetic circuit

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45th CIGRE Session 8/24 -8/29/2014 in Paris

PS1 > Best practices for asset management: Health index as a tool for condition assessment and applications of transformer fleet ranking by condition and criticality. PS2 > Transformers for specialized applications: Application of phase-shifting, converter, industrial and offshore/sub seatransformers, variable shunt reactors and other specialized designs. PS3 > Field experience with the use of non-conventionalmaterials and technologies: Transformer experience with alternative insulating liquids, gas and solids, improved winding and core material and technologies. Experience with new technologies for components. High-Temperature Superconducting (HTS) transformer experience and applications.

Call For Papers:Synopsis for Technical Papers: 4/5/13Approval of Synopsis: 9/10/13Submit Final Paper : 1/10/14

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Thank you for your attention

www.cigre-a2.org