Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid

Abstract

The invention provides an intelligent diagnosis method for the corrosion failure point of a transformer substation grounding grid. The method comprises the following steps of: firstly, inputting a transformer substation grounding grid model into a computer, on the premise that the structure of the transformer substation grounding grid is analyzed, decomposing the transformer substation grounding grid and selecting an optimum point by a topology decomposition method, acquiring an electric potential signal and transmitting to an alternating current / direct current signal acquiring system by a preset sensor due to an injected sine alternating current single, transmitting the signal to the computer to be computed and displayed on a liquid crystal display by a microcontroller, computing the probable position in which the corrosion failure point is arranged by the computer according to the electric potential distribution, building a mini type grounding subgrid model, injecting a direct current large current signal into the mini type grounding subgrid, acquiring by a controller to acquire the node voltage and the current valve of the grounding grid at the time, and transmitting the acquired data to the computer to build mathematical model computation to finally obtain the specific position of the corrosion failure point.

Description

technical field [0001] The method relates to a distribution substation signal acquisition analysis and transmission technology, more specifically, the invention relates to an intelligent diagnosis method for corrosion fault points of a substation grounding grid. technical background [0002] With the development of modern large power grids in the direction of ultra-high voltage, large capacity and long distance, the requirements for the safety, stability and economic operation of the power system are getting higher and higher. In order to ensure the safe and stable operation of the power grid and improve the reliability of power supply, there must be a Good substation grounding device. [0003] The reason is that the grounding grid is a hidden facility buried deep underground in the power system. The main technical problems exposed on site are corrosion of the grounding grid, small cross-section of the grounding down-conductor, and poor connection between grounding bodies. T...

AI Technical Summary

Problems solved by technology

It can not only avoid the problem of inaccurate positioning only through the potential distribution, but also avoid the problem that the PC cannot be calculated or the calculation result is inaccurate because the grounding grid is too large. The method is simple, the diagnosis efficiency is high, and the engineering practicability is strong.

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