Although progress has been made over the last 20 years, there still remain unresolved problems with load tap changers (LTCs) that need to be addressed. In particular, coking of LTC components remains a major problem. There is currently no non-invasive method to determine the inception of coking, its presence and severity, and its relation to LTC make and model.
This report summarizes the research findings of a study which used a small scale LTC model to carry out accelerated LTC operations. The objective of the study was to determine if a relationship between fault gases and/or compounds exists and might act as potential indicators for the inception of coking at the contacts or other relevant components.
Load Tap Changer, Diagnostics, Markers, Coking, Non-invasive Analysis