New insulation diagnostic and monitoring techniques for in-service HV apparatus

9 December 2002

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. 448-451
https://doi.org/10.1109/icpadm.1991.172093

Abstract

Insulation condition monitoring of high-voltage instrument transformers and transformer bushings is of significant importance in maintaining a safe and reliable electricity supply system. To achieve this, there is an increasing trend to perform in-situ insulation quality measurements on this equipment. The authors describe new insulation diagnostic and monitoring techniques, developed with the Queensland Electricity Commission, for use in an in-service HV plant. The techniques enable the dielectric dissipation factor (DDF) and partial discharge (PD) level of HV insulation to be measured while an instrument transformer or bushing is in-service. Application of the DDF measurement technique to provide a continuous insulation monitor is also covered. The continuous online system is designed to ultimately allow monitoring of all bushings and current transformers within an entire situation.

Keywords

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