CIGRE UK Technical Webinar – 20th October 2021

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  • 4th October 2021
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Frequency Response Analysis (FRA) for Transformer Winding Deformation and Movement: From Measurement to Diagnosis

An Online Technical Webinar

Wednesday 20th October 2021 | 12.30 to 13:30


Frequency Response Analysis (FRA) is commonly used in detecting winding movement in power transformers. In the last 20 years, numerous literatures have been published on FRA. International collaborations under CIGRE, IEC and IEEE have produced two technical brochures, a guide and a standard focusing on FRA measurement and interpretation techniques. However, interpretation of frequency response remains a challenge as it highly relies on the repeatability of the measurements and objective interpretation seems to be distant as this requires verification on massive frequency response database, all measured in the same and consistent way. In this session, we will explore FRA measurements aspects further together with two experienced engineers in this field. This session aims to highlight the importance of good measurement practice to ensure repeatability and therefore unravel the key to effective FRA interpretation and diagnosis.

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Speaker Profile

Dr Dahlina Sofian graduated from the University of Manchester with a PhD in Electrical Power Engineering specialising in “Transformer FRA Interpretation for Detection of Winding Movement”. She had over 10 years’ experience with GE Power Transformers where she was heavily involved in product standardisation, design optimisation and diagnostic tests for large power transformers product line. She was also part of the working group for IEC 60076-18 Measurement of frequency response. She joined GE Grid Integration (HVDC) in 2018 and was involved in HVDC solution standardisation and the development of next generation submodules for modular multilevel converters. Dahlina has recently joined Scottish Power Renewables as Senior Electrical Equipment Engineer, with continued interest in power transformers design optimisation and diagnostics.

Rafal Zaleski graduated from the Silesian University of Technology in 2002 with a Master of Science degree. Following education, he started gaining his first practical experience in Poland with Energo-Complex company. There, he was responsible for transformer condition assessment through electrical testing and analysis on on-line condition tests results. He joined Doble Engineering Company in 2009 as Senior Test Engineer where he initially continued with transformer condition assessment quickly expanding his skills across other substation apparatus. Nowadays he holds Principal Engineer position within Doble and he is responsible for consultancy services related to purchase of new-built transformers, eg. factory progress inspections, FAT witnessing etc. He has been an active expert member for two CIGRE working groups on FRA measurement and interpretations and has amble experiences in field tests using FRA technique. 


This Webinar series is kindly sponsored by Burns & McDonnell