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This paper presents a new system for detecting electromagnetic waves emitted from a partial discharge (PD) due to a material defect in a high-voltage electric machinery and apparatus. PD is a symptom and/or a direct cause of the deterioration of the insulation used in the high-voltage stator coil. This system can detect PD by using the spatial phase information of the microwave emitted from PD which is very short duration voltage pulse. We describe the properties of this system,which is composed of two double-ridge-guidehorn-antennas, a GHz-2ch-down-converter (originally designed and produced), two A/D converters and a computer, and experimentally show that this system is able to apply to detection of the microwave emitted from PD of the stator coil in this paper. The result of this work is the development of new non-contact PD detection system for the generator which can be performed by station personnel.

denki gakkai rombunshi. b, denryoku, enerugi bumonshi/denki gakkai rombunshi. b, denryoku, enerugī bumonshi

Development of a New System for Detecting Microwave Associated with a Partial Discharge of the Stator Coil in Generator Using Spatial Phase Difference Method