Insulation structure partial discharge signal detection device

Abstract

The invention relates to a device for detecting the partial discharge signal of an insulating structure, which is characterized by comprising a booster transformer. A full-bridge rectifying circuit is connected with the secondary side of the booster transformer; the output end of the full-bridge rectifying circuit is connected with an H-bridge inverting circuit and an IGBT (insulated gate bipolar transistor) control circuit in a bridging way; the test voltage obtained through the output side of the H-bridge inverting circuit is applied to two ends of a test sample; two input ends of a signal collecting and processing plate are connected with the output end of the H-bridge inverting circuit and the output end of the IGBT control circuit; and the output end of the signal collecting and processing plate is connected with a computer. The circuits of the device have simple structures and can effectively capture and separate the weak signal so that the weak signal can not be submerged in the peak voltage, and reliable data support is provided for the study of the partial discharge of the insulating structure.

Description

technical field [0001] The invention relates to a partial discharge signal detection device of an electric insulation structure, especially aimed at the discharge phenomenon generated under high-voltage and high-frequency pulses. Background technique [0002] PWM frequency converters have been widely used in motor drive systems. With the continuous promotion of frequency conversion speed regulation motors, a large number of frequency conversion motor insulation failures have occurred prematurely. Research results at home and abroad show that the partial discharge of the insulation structure under the high-frequency square wave pulse of the frequency converter is the main reason for the premature failure of the insulation. Therefore, effectively extracting the partial discharge signal under the condition of high-frequency continuous pulse will help to analyze the damage mechanism of the insulation structure, evaluate the aging life of the insulation structure, and provide a t...

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Problems solved by technology

[0005] The high-frequency power supply used in the test uses the IGBT high-power switching device inverter circuit to realize the bipolar pulse square wave. The peak-to-peak output voltage of the inverter circuit is about 6000V, and the partial discharge voltage to be detected is only at the mV level. The measured signal will be partially submerged under the peak voltage and cannot be identified, which is not conducive to the subsequent important research work such as discharge signal processing and analysis.

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