On-Line Partial discharge Detection of Turbine Generator using GHz-Band Spatial Phase Difference Method

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  • GHz帯電磁波空間位相差法を用いた火力タービン発電機の運転中における部分放電検出
  • GHzタイ デンジハ クウカン イソウサホウ オ モチイタ カリョク タービン

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Abstract

Partial Discharge (PD) within voids in solid insulating system is a symptom and/or a direct cause of a deterioration of stator windings of a turbine generator. The bandwidth of the electromagnetic waves emitted from PD is very broad and ranges to GHz. We developed a new system based on “Spatial Phase Difference Method” for detecting microwave (GHz) emitted from PD. In this paper we applied this system to two off-line turbine generators in the overhaul and an on-line turbine generator which has two built-in antennas. On-line PD detection of the turbine generator is very useful for recognizing abnormal and/or deteriorated stator winding insulation without a machine outage. It was found that the detection system was able to detect microwave emitted from PD in operating turbine generator.

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