Degree: PhD
Starting date: September 2017
Email: aadevadi@uwaterloo.ca
Research title
Transformer diagnosis under high frequency transient voltages
Project Description
Wind turbine step up (WTSU) transformers are subjected to high frequency transients which lead to gassing problems and premature insulation failures. The high frequency transients are produced due to the operation of vacuum circuit breaker (VCB), electromagnetic propagation in the cables, transformer loading cycle, and convertor side harmonics. The present work deals with diagnosis of WTSU transformers by using various techniques like dissolved gas analysis, frequency response analysis, partial discharge measurements, and dielectric frequency response. The work mainly involves detailed understanding of the influence of transient over-voltages on WTSU transformers and developing possible mitigation techniques.