Online detector for partial discharge of gas-insulated substation and noise reduction method

Abstract

The invention relates to a device of detecting a part of gas insulation composite electrical equipment on-line, a silent method and a detecting technique of gas insulation composite electrical equipment, which comprises the following parts and steps: external mask resonance loop sensor, enlargement filter, high speed digital collector and computer; timing partial discharging signal collection, multi-wavelet silence, partial discharging judgment and alarm; adapting joint software anti-interference silence to detect partial GIS, which is characterized by strong anti-interference ability, broad detection band, sensibility and accuracy of detection. The invention is applied in gas insulating breaker, cable and transforming insulation detection.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment insulation monitoring, in particular to the insulation monitoring technology of gas-insulated combined electric appliances. Background technique [0002] During the operation of gas-insulated combined electrical equipment (GIS) in electrical equipment, due to various defects inside GIS, various forms of partial discharge will be caused, such as corona, impurity discharge, and air gap discharge inside epoxy support insulators. Partial discharge inside GIS will develop into insulation breakdown fault for a period of time, causing power outages, affecting the safe operation of the power system and causing losses to the national economy. The partial discharge of early insulation faults in GIS has the characteristics of ultra-high frequency, and its equivalent frequency is very high, up to 1GHz. Since GIS is a good waveguide structure, the ultra-high frequency signal generated by partial ...

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Problems solved by technology

[0003] Existing external partial discharge detection devices for gas-insulated combined electrical appliances that have no impact on equipment operation and are easy to apply on site, such as the "antenna of GIS fault detection device" disclosed in Chinese patent CN00237978.3, consist of a signal receiver, an impedance converter, a shielding It is composed of cables, which is characterized in that the shape of the signal receiver is a ring, with a slot in the middle, and an impedance converter is connected between the shielded cable and the signal receiver, but its detection frequency band is narrow, the sensitivity is not high, and the anti-interference ability is relatively low. Poor, inaccurate signal detection

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