A grounding grid fault diagnosis method and device based on injection current multi-field coupling

Abstract

The invention provides a grounding network fault diagnosis method based on injection current type multi-field coupling. The pulse current is injected into the grounding network based on the principleof injection current type multi-field coupling, the pulse current and the pulse magnetic field react to produce a force sound source, the force sound source produces a sound signal and the state of the grounding network is judged through the sound signal characteristic. The fault diagnosis device is arranged on the ground above the grounding network. The output end of the pulse current source is connected with the grounding down lead of the grounding network. The emitted pulse current flows in the underground grounding network and produces the pulse magnetic field. The pulse current and the pulse magnetic field produce the vibration force sound source in the grounding network metal. The sound signal excited by the force sound source is received by the sound sensor array arranged on the ground above the grounding network. The sound signal receiving circuit performs broadband low noise amplification, band-pass filtering and analog-to-digital conversion on the sound signal. The data processing and fault diagnosis unit judges the corrosion situation according to different sound waves detected under the good, corrosion and fracture condition of the grounding network so as to extract theabnormal signal and diagnose the fault of the grounding network.

Description

technical field [0001] The invention relates to a grounding grid fault diagnosis, in particular to a grounding grid fault diagnosis method and device of injection current type multi-field coupling. Background technique [0002] The grounding grid plays an important role in the safe and reliable operation of the power system. It is very important to protect the personal safety of the staff in the station and the normal operation of various electrical equipment. Its grounding performance has always been valued by the production and operation department. At present, galvanized steel is a commonly used grounding conductor material for domestic substation grounding grids. After a long period of operation, in rainy and coastal areas, it is prone to corrosion as the service life increases. According to the strength of soil corrosion, grounding The annual corrosion rate of the conductor in the soil ranges from 2.0mm to 8.0mm, and even breaks in severe cases. In addition, poor weldin...

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Problems solved by technology

[0009] Regarding the coupling technology of magnetic field and sound field, the current research is mainly concentrated in the field of biomedicine, but it has not been reported in the detection of grounding grids.

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