Partial discharge detection device and detection method thereof

Abstract

The invention relates to a partial discharge detection device and a detection method thereof. The device comprises a signal generation module, a signal extraction module, a sampling module, and a noise reduction processing module; the signal generation module is used for outputting oscillatory wave signals to a to-be-detected three-phase cable so as to respectively form detection paths of each phase, and the oscillatory wave signals are used for exciting each phase cable to generate partial discharge signals; one end of the signal extraction module is connected with the signal generation module, the other end of the signal extraction module is used for being connected with a three-phase cable, and the signal extraction module is used for extracting partial discharge signals on the detection paths of all phases and generating extraction signals corresponding to the partial discharge signals; the sampling module is connected with the signal extraction module and is used for sampling each phase of extraction signal to obtain the waveform of each phase of extraction signal; and the noise reduction processing module is connected with the sampling module, and is used for carrying out noise reduction processing on the waveform of the sampled extraction signals of each phase so as to obtain the waveform of the extracted signals after noise reduction, and analyzing the partial discharge state of the three-phase cable according to the waveform of the extracted signals after noise reduction. And the purpose of accurate detection can be achieved.

Description

technical field [0001] The present application relates to the technical field of insulation state detection of power cables, in particular to a partial discharge detection device and a detection method thereof. Background technique [0002] With the development of my country's urban power distribution network, the transformation of overhead lines into the ground has become one of the important contents of urban power grid construction. Due to the good electrical and mechanical properties of cross-linked polyethylene (XLPE) cables, the main power production and operation in my country The cables are all polyethylene (XLPE) cables. Partial discharge is an important cause of cable insulation degradation. Although partial discharge will not form a penetrating discharge channel to cause insulation breakdown, it will cause a large number of space particles to accelerate and hit the insulating medium, causing XLPE polymer chemical bonds to break and reduce its insulation performance...

AI Technical Summary

Problems solved by technology

At present, the detection of oscillatory wave partial discharge still needs to be detected phase by phase. Even if the equipment capacity is sufficient, however, due to the difficulty of distinguishing partial discharge signals, it is impossible to test the three phases at the same time. In addition, even if the power cable is tested offline, it still has a large background noise. This can greatly reduce the sensitivity of PD detection

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