CIGRE Study Committee A 2 Annual report 2020

CIGRE Study Committee A 2 Annual report 2020 for CIGRE Canada November 6, 2020 Canadian Representative: Patrick Picher Presented by: Patrick Picher

Study Committee A 2 – Transformers 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, tapchanger…).

Chairman Pascal Mueller (CH) Secretary Marc Foata (DE) 14 Working Groups 24 Regular members 16 Observer members 8 Advisory Groups CA Contribution Organization of SC A 2 (new 2020) JWG A 2/D 1. 51 JWG A 2/C 4. 52 Partial discharge measurements for factory and site acceptance tests High-frequency transformer models for non-standard waveforms 2014 WG A 2. 53 Transformer FRA interpretation 2016 Tutorial WG A 2. 54 Power transformer audible sound requirements 2016 A 2. 3 Technology WG A 2. 55 Life extension of transformers and reactors 2016 A 2. 4 Utilisation WG A 2. 56 Power transformer efficiency 2016 A 2. 5 Access to electricity WG A 2. 57 Effects of DC bias on power transformers A 2. 6 2016 Green book A 2. 7 Digitalization A 2. 8 Distribution A 2. 1 Strategic A 2. 2 Liaison IEEE Liaison IEC TC 14 & TC 10 Liaison AG D 1. 01 WG A 2. 58 WG A 2. 59 Installation and pre-commissioning of transformers and shunt reactors On-site assembly, on-site rebuild, and on-site high voltage testing 2017 WG A 2. 60 Dynamic thermal behaviour of power transformers 2019 WG A 2. 61 On-load tap-changer best practices 2019 WG A 2. 62 Analysis of AC Transformer Reliability 2019 WG A 2. 63 Transformer impulse testing 2019 WG A 2. 64 Condition of cellulose insulation after factory acceptance test 2019

CIGRE 2020 e-session • PS 1: Technologies to integrate distributed renewable energy resources (11 papers) • PS 2: Advances in dielectric design and testing (8 papers) • PS 3: Improving reliability (23 papers) • 2 papers from Canada in PS 3 • Continuous improvement of transformer specifications at a large utility (Hydro-Québec) • Advancements in transformer site dryouts (Hitachi-ABB PG) • SC A 2 Tutorial from WG A 2. 53: Transformer FRA interpretation • Technical Committee award to Michel Duval (Hydro-Québec) • In D 1 session, 13 papers related to transformers • Bushing monitoring, dynamic loading and overloadablity, PD testing (UHF, etc. ), on-line diagnosis, paper aging assessment, FRSL, oil degradation, winding clamping pressure, stray gassing,

2020 Virtual CIGRE Canada conference (Oct. 20 -21) A 2 -related papers 1. T. Schneider, J. Malde, “What it takes to design, manufacture and operate transformers under arctic temperature conditions” (Siemens AT) 2. J. B. Dastous, S. Brodeur, “Overpressure Test of an Arc Resistant Power Transformer” (HQ, HAPG) 3. E. G. Hennig et al. , “Be Prepared for the Unexpected: Design to Increase Personal Safety, Reduce Fire and Explosion Risk, and Mitigate Environmental Impact” (Siemens, CA/DE/AT/US) 4. K. Callery, “Power Transformer Bushings – Inspection, Testing and Refurbishment” (Hydro One) 5. A. Naderian et al. “Advanced Power Transformer Diagnostics – Detection of Core Ground Issues– core ground issues” (Metsco) 6. E. Karimi et al, “Investigation of Wind Farm Padmount Transformer Through Transient Studies” (Hatch) 7. Y. Fillion et al. “Transformer Limited Fault TRV’s field measurements used to validate EMTP transformer models and comparison with TRV calculations based on existing standards (IEEE Std C 37. 06. 1™-2017 and IEC 62271 -100)” (Hydro-Québec) Design Diagnostics Interactions with network

Recently published reports • Interim report on Transformer audible sound requirements, Electra, June 2020 • TB 812 (2020): Advances in the interpretation of transformer Frequency Response Analysis (FRA) • TB 783 (2019): DGA monitoring systems • TB 779 (2019): Field experience with transformer solid insulation ageing markers • TB 771 (2019): Advances in DGA interpretation • TB 761 (2019): Condition assessment of power transformers • TB 755 (2019): Transformer bushing reliability

2021 Colloquium Bucharest, Romania – October 11 -13 (Call of papers, synospis March 31 st 2021) • Joint Colloquium with SC B 3 in conjunction with CMDM conference 6 th edition: Challenges for digital T&D substations and reliable equipment of the future (https: //cmdm 2021. org/sc-a 2/invitation/) • PS 1: Integration of intelligence in T&D substations • Expectation and benefit from digital substation and digital transformer • Digitalisation into T&D assets: application of Internet of Things (Io. T), Digital Twin, Light Detection and Ranging (LIDAR), Geographic Information System (GIS), Artificial Intelligence (AI), use of robots and drones, etc. • PS 2: Reliability of T&D equipment and substations of the future • Impacts of Distributed Energy Resources connection on substations: improvements of thermal performance, aging impacts, Probabilistic of Failure (Po. F), transformers dynamic loading profiles • Advanced transformer models (thermal, reliability, ageing) • Innovative maintenance methods and diagnostics • Maintenance strategies: condition-based/ risk-based and predictive maintenance approaches, replacement/ refurbishment and life extension alternatives

Canadian Representative • Patrick Picher • • Company: Hydro-Québec Title: Senior Research Scientist Email: picher. patrick@hydroquebec. com Phone: 1 -450 -652 -8256