Substation ground network defect synthesis diagnosis method and diagnosis system thereof

Abstract

The invention provides a comprehensive diagnosis method and a diagnosis system thereof for diagnosing the defects of a substation grounding grid. The diagnosis method establishes the topology model of the substation grounding grid and the software arithmetic of the grounding diagnosis system which takes a node voltage optimization model as a core; corresponding current excitation nodes and potential reference nodes are found out in the substation grounding grid and voltage measurement sensors are arranged at all nodes; after excitation signals are applied to the current excitation nodes, the sensors obtain the detection signals and transmit the detection signals to the comprehensive diagnosis system which is used for diagnosing the defects of the substation grounding grid and connected with the sensors; the software arithmetic of the comprehensive diagnosis system for diagnosing the defects of the substation grounding grid is used for calculating relevant parameters of the grounding grid branch resistance, thus determining the positions of the failure defects of the substation grounding grid; the diagnosis system consists of a power supply device, a filter device, a data collecting device and a background PC machine and has the advantages of reasonable design proposal, convenient operation, exactly detecting the defects of the main net of the grounding grid and the grounding down lead wire without excavating the ground surface, and the like.

Description

technical field [0001] The content of the invention belongs to the technical field of electric power equipment maintenance systems, and relates to a comprehensive diagnosis method and a diagnosis system for detecting fault defects of substation grounding grids. Background technique [0002] The grounding grid of the power system substation is used as the grounding of AC and DC equipment and lightning protection protection grounding of the substation. It plays a vital role in the safe operation of the system. It is an important measure to maintain the safe and reliable operation of the power system and ensure the safety of electrical equipment and operating personnel. . In the case of defects in the grounding grid, such as a grounding short circuit fault or lightning strike caused by corrosion damage in the power system, the potential of the equipment grounding point and the local potential difference on the ground surface will increase abnormally, which will directly endange...

AI Technical Summary

Problems solved by technology

Although this method is direct and reliable, it is blind, lacks pertinence, and cannot prevent accidents in advance. It takes a long time, requires a large amount of engineering, and wastes a lot of investment. The degree of corrosion of the excavated flat iron and whether it can continue to be used, etc. Lack of quantitative judgment basis, neither detection means nor corresponding detection standards

In addition, so far, a large number of old substation grounding grids have been severely corroded and damaged, and they are in urgent need of renovation. It is difficult to effectively determine the scope and sequence of substation grounding grid reconstruction by relying on the current excavation detection method

On the other hand, at present, the method of re-laying the grounding grid of the substation is mostly used, which is neither scientific nor economical, and this kind of grounding grid re-laying without guidance may, in some cases, cause the acceleration of the new ground grid. chemical corrosion

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