Title :
Partial discharges within power transformers and the use of ultrasonic techniques in their location
Author_Institution :
GEC Alsthom Transformers Ltd, Stafford, UK
Abstract :
A power frequency partial discharge (PD) within the insulation structure of a power transformer (e.g. within a cavity or an inclusion) is generally regarded as being the instantaneous breakdown of a small capacitance which forms a part of the insulation capacitance as a whole. This discharge creates a short current pulse which is repeated every time the small capacitance is recharged to a level sufficient to create local breakdown. Associated with the partial discharge is an ultrasonic pulse. The author describes a technique using ultrasonic transducers to locate the pulse and hence the source of the partial discharge
Keywords :
charge measurement; partial discharges; power transformers; ultrasonic measurement; partial discharges location; power frequency partial discharge; power transformers; ultrasonic pulse; ultrasonic techniques; ultrasonic transducers;
Conference_Titel :
Assessment of Degradation Within Transformer Insulation Systems, IEE Colloquium on
Conference_Location :
London