Partial discharge distributed monitoring and early warning method based on switch cabinet ground wave

Abstract

The invention discloses a partial discharge distributed monitoring and early warning method based on switch cabinet ground electric waves, and the method comprises the steps: employing multiple sensors to synchronously collect physical quantity signals of partial discharge, converting the physical quantity signals into partial discharge pulse signals, and transmitting the partial discharge pulse signals to a data collection card; pulse waveform amplitude-phase information is extracted through time domain windowing, a power frequency phase period is divided into N windows, the number Ni of pulses in the ith window is obtained, the average pulse amplitude Ii in the ith window is calculated, and continuous time domain waveforms are reconstructed through the average pulse amplitude and the center phase of the window where the average pulse amplitude is located; and drawing a partial discharge capacity oscillogram according to the time domain waveform and the pulse signal phase information, carrying out partial discharge state monitoring and fault diagnosis based on the oscillogram, and providing insulation degradation early warning. According to the method, the noise influence is effectively removed, the signal-to-noise ratio is improved, the measurement result is accurate, an effective basis is provided for power equipment operation condition evaluation and operation and maintenance, and equipment loss and power failure loss caused by faults are reduced.

Description

technical field [0001] The invention relates to the technical field of state monitoring and fault diagnosis of power equipment, in particular to a distributed monitoring and early warning method for partial discharge based on electric waves of switch cabinets, which is suitable for partial discharge monitoring of various power equipment. Background technique [0002] Partial discharge is an electrical discharge in which the insulation between conductors is only partially bridged. It is the main cause of insulation degradation of power equipment. Through the detection of partial discharge signals, the evaluation of the degree of insulation degradation and service life of power equipment can be realized. During the manufacture and operation of electrical equipment, bubbles, impurities and other substances will appear inside the insulating medium, which will lead to areas of high field strength inside or on the surface of the insulating medium. Once the field strength in these a...

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Problems solved by technology

Although the existing partial discharge tester can detect the partial discharge signal, the partial discharge tester is greatly affected by the noise during the field test, and the randomness of the partial discharge signal is relatively lacking, resulting in low accuracy of the detection results. Difference

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