Transformer substation grounding network frequency response test device

Abstract

The invention discloses a transformer substation grounding network frequency response test device, which comprises a power supply module, a frequency generator module, a power amplification module, a voltage and current collecting module and an intelligent control module, wherein the voltage and current collecting module, the intelligent control module, the frequency generator module and the power amplification module are sequentially connected, the power supply module provides the power supply for each module of the test device, the intelligent control module controls the frequency generator module to output sine wave voltage signals at different frequencies in different times, the corresponding sine wave voltage signals are amplified and loaded onto a grounding network to be tested by the power amplification module, and then, the voltage and the current of the grounding network to be tested are collected through the voltage and current collection module, so the impedance of the grounding network to be tested under the signal loading at the different frequencies is calculated by the intelligent control module. The device can be used for conveniently testing the electric completeness of the grounding network.

Description

technical field [0001] The invention relates to the technical field of state monitoring of power system substation equipment, in particular to a frequency response testing device for substation grounding grids. Background technique [0002] The substation grounding grid plays an important role in making the fault current and lightning current enter the ground safely. With the increase of the service life of the grounding grid, the cross-section of the grounding grid material will become smaller due to corrosion and other reasons, and some parts such as grounding down-conductors may also appear local thinning or even disconnection. [0003] As time goes by, when the grounding grid buried in the soil corrodes to a certain extent, it will pose a great threat to the safe operation of the power substation, and the grounding grid should be inspected regularly. DL / T475 stipulates that the electrical integrity of the grounding grid should be tested. It is stipulated that the value ...

AI Technical Summary

Problems solved by technology

The electrical integrity test based on DC resistance cannot judge the change of the cross-section of the grounding grid, but can only judge whether there are poor connections, breakpoints, etc.

[0004] At present, for the cross section caused by the corrosion of the grounding grid, the traditional detection method generally needs to excavate the grounding grid to judge the corrosion status, which is not only inefficient, but also slow in progress and high in cost, and it is easy to cause damage to the grounding grid itself

At present, there is no online monitoring equipment based on the impedance frequency response of the grounding grid

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