System and method for online monitoring grounding networks of power stations and substations

Abstract

The invention relates to the field of power equipment online monitoring, in particular to the online monitoring of grounding networks of power stations and substations. A system monitors the partial current of an overhead ground wire or cable sheath of a power transmission line, the current of a neutral point of a transformer, the ground potential rise of the grounding network and own impedance of a grounding body in real time in the grounding short-circuiting of a power grid, comprehensively records the operating state of the grounding network, and changes electric quantities which cannot bemonitored conventionally into constantly measured quantities. The execution of online monitoring of the grounding network can provide quantitative indicators for designing, capital construction, running maintenance and realization state management, explores new ways for increasing a shunting coefficient and reducing grounding current, turns the blind huge investment in the grounding network, improves the security, reduces equipment risks and running cost, and achieves immeasurable economic benefits. Similar technologies are not put forward at home and abroad at present.

Description

technical field [0001] The invention relates to the field of on-line monitoring of electric power equipment, in particular to an on-line grounding monitoring system and a monitoring method of a power plant and a substation. Background technique [0002] The grounding grid of power plants and substations is one of the important power equipment, which is responsible for the functions of working grounding, protective grounding, and lightning protection grounding, and plays an important role in the safe production of power systems and the personal safety of staff. Due to the concealment of the grounding grid itself, it is impossible to inspect and monitor the electrical performance in the conventional way, which has always been a blind spot in the power equipment. Excavation inspection is the most direct and convenient for the corrosion of grounding materials in the soil. The electrical performance in operation has not been able to be monitored, which is a major gap in power pr...

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Problems solved by technology

[0005] Fujian Electric Power Test Research Institute and Xiamen Yichuang Technology Development Co., Ltd. announced a "grounding grid status monitoring system" (application number 200520200385.2) in 2005, proposing a method for measuring the internal integrity of the grounding body in the grounding grid; Hunan University In 2007, Peng Minfang and others published an invention patent (application number 200710034421.6) of "on-line monitoring method and device for grounding grid in power substation", and proposed a method for monitoring the corrosion status of the grounding body in the grounding grid. After this signal is injected into the grounding body, corresponding information is generated to analyze the working conditions of the grounding grid itself, but the real-time working conditions of the grounding grid when the grounding fault occurs cannot be monitored.

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