Fault single-ended accurate positioning method and system for high-voltage GIL equipment

Abstract

The embodiment of the invention provides a fault single-end accurate positioning method and system for high-voltage GIL equipment, and relates to the technical field of electrical equipment. Accordingto the method, an ultra-wideband voltage sensor is additionally arranged at the wire outlet end of high-voltage GIL equipment; the transient voltage waveform generated by the fault point is accurately recorded; the method comprises the following steps: performing continuous wavelet transform on a transient voltage waveform to obtain a wavelet coefficient accumulation characteristic curve, extracting a voltage traveling wave characteristic moment, calculating to obtain the time length of the transient voltage propagating from a fault point to an outgoing line end, and finally obtaining the distance between the fault point and the outgoing line end in combination with the propagation speed of electromagnetic waves in GIL equipment. According to the method, only one ultra-wideband voltage sensor is needed, 10-meter-level accurate positioning of the fault point of the GIL equipment can be automatically achieved, and the method has great significance in shortening the GIL equipment insulation fault repair time, improving the GIL fault processing efficiency and guaranteeing the power supply reliability.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to a method and system for accurately locating faults at high-voltage GIL equipment. Background technique [0002] Gas-insulated transmission lines (English name: gas-insulated transmission lines, referred to as: GIL) is a high-voltage, high-current power transmission equipment that uses high-pressure gas and conductors coaxially arranged. GIL equipment has large transmission capacity, low unit loss, less environmental impact, and high operational reliability. It is widely used in power transmission occasions of large hydropower plants and nuclear power plants, as well as complex power transmission channels such as crossing rivers and mountains. [0003] During the operation of high-voltage GIL equipment, insulation breakdown faults are often caused due to internal latent insulation defects. Once the insulation breakdown of the high-voltage GIL occurs, the transmission...

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Problems solved by technology

[0004] However, because the GIL equipment is fully enclosed, it is inconvenient to quickly locate the fault location

Due to the long length of the GIL, usually more than 500 meters, and the long distance and large number of gas chambers, it takes too much time and cost to locate the faulty gas chamber using the conventional gas decomposition product detection method, and it may not be possible to detect the faulty gas chamber

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