Electric power grounding grid defect comprehensive diagnosis system and method for transformer substation

Abstract

The invention provides an electric power grounding grid defect comprehensive diagnosis system and method for a transformer substation. The system comprisesa main control module, the main control module is electrically connected with a filtering module, a data collection module and a terminal PC. The filtering module is configured to output input AC commercial power to a ground network circuit in arectification filtering mode. The data collection module is electrically connected with the filtering module and is configured to collect detection signal data measured by avoltage measurement sensor, and the main control module is configured to receive transmission data of the data collection module, control work of the filtering module and transmit the processed data to theterminal PC. According to the invention, the defect condition of each branch of the grounding grid can be obtained, the operation state of the transformer substation grounding grid with long operation time can be determined, and whether the grounding grid needs to be transformed and the mode adopted by the grounding grid transformation are determined.

Description

technical field [0001] The disclosure belongs to the technical field of electric equipment, and relates to a system and a method for comprehensively diagnosing defects in electric power ground networks for substations. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The grounding grid of a substation is generally buried underground, which is a concealed project. Although the grounding grid buried underground is not easy to be damaged by external forces, it is not easy to check and repair, and it is difficult to understand the current situation of the grounding grid, and the information and status of many substation grounding grids are also Inconsistency, some old substations do not even have ground network maps, which lead to lack of data or low data accuracy, which will directly affect the transformation process during substation transfo...

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Problems solved by technology

[0004] This defect diagnosis method is blind, lacks pertinence, and cannot prevent accidents in advance. It also takes a long time, requires a large amount of engineering, and wastes a lot of investment. It lacks quantitative judgment on the corrosion degree of ground network equipment and whether it can continue to be used. basis, there is no detection method and detection basis

[0005] 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

[0006] On the other hand, the current grounding grid renovation project generally adopts the method of direct re-laying. Although this method can radically solve the problem of grounding grid faults, it is neither scientific nor economical. In some cases, it may also cause accelerated electrochemical corrosion of the new ground grid

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