Development and application of new condition assessment methods for power transformers

Recent advances in the application of nontraditional methods and procedures for offline diagnosis and online monitoring of new and service-aged power transformers are discussed. Advanced offline methods are based on the main operational stresses (electrical, mechanical, thermal) and on typical failure modes: measurement of polarisation and depolarisation currents, electrical detection of partial discharges and measurement of the transfer function. A pilot installation of an online monitoring system on a strategically important transformer is described. The measured data of the built-in sensors (e.g. load, temperatures, gas and moisture in oil, overvoltages) are analyzed using a model-based software approach with an adaptive threshold to define faulty conditions

Published in:
International Conference on Large High Voltage Electric Systems. CIGRE'98. Session Papers, vol.2, 10 pp. vol.2 -
power transformers;condition assessment methods;offline diagnosis;online monitoring;depolarisation currents;polarisation currents;partial discharge detection;transfer function measurement;model-based software approach;adaptive threshold;faulty conditions definition;

 Record created 2007-04-04, last modified 2018-03-17

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