Partial discharge detection apparatus and detection method of electrical rotating machine

Abstract

A partial discharge detection apparatus of an electrical rotating machine includes a metal frame connected to a stator frame of the electrical rotating machine, a power line connected to one of a stator winding corresponding to one phase of three phases in the metal frame and a neutral point lead line connected to a neutral point of three-phase stator windings and arranged in the metal frame to propagate a partial discharge signal generated by degradation of the stator winding, a sensor including a rod antenna which is installed around the power line or neutral point lead line in the metal frame to electrostatically and magnetically induce the partial discharge signal propagated to the power line or neutral point lead line, and a detector which receives, via a signal lead line, a signal generated in the sensor and detects partial discharge by signal processing.

Description

Partial discharge detection device and detection method of rotating electric machine technical field The invention relates to a partial discharge detection device and a detection method of a rotating electrical machine. Background technique When a high-voltage rotating electrical machine operates continuously for a long time, the electrical insulation performance inside the electrical machine is continuously degraded due to electrical, thermal, mechanical and environmental stresses. This will eventually lead to dielectric breakdown and failure of the motor. From a reliability and operational management perspective, high voltage rotating electrical machines need to monitor and diagnose internal insulation degradation. In particular, the stator windings of rotating electric machines are subjected to high electrical, thermal and mechanical stresses, therefore, it is very important to monitor and diagnose the insulation degradation of the stator windings. In order to detec...

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Problems solved by technology

However, since high electrical stress is applied to the direct detection sensor, the sensor itself needs to have high insulation performance

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