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3. Development and application of new condition assessment methods for power transformers

Author

Aschwanden, T., Hassig, M., Fuhr, J., Lorin, P., Der Houhanessian, V., Zaengl, W., Schenk, A., Zweiacker, P., and Piras, A.

Subjects
polarisation currents, adaptive threshold, depolarisation currents, transfer function measurement, partial discharge measurement, online monitoring, power transformer insulation, partial discharge detection, offline diagnosis, power transformers, monitoring, insulation testing, ageing, model-based software approach, transfer functions, faulty conditions definition, power transformer testing, condition assessment methods
Abstract

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

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