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Transformer substation grounding network frequency response test device

A technology for frequency response testing and substation grounding grids, which is applied to frequency measurement devices and fault locations, can solve problems such as inability to judge grounding grid section changes, grounding grid damage, and cross-section reduction, and achieve strong suppression, smooth operation, and The effect of ensuring stability

Active Publication Date: 2015-03-04
广东电网有限责任公司韶关供电局
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  • Summary
  • Abstract
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  • Claims
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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

Method used

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  • Transformer substation grounding network frequency response test device
  • Transformer substation grounding network frequency response test device
  • Transformer substation grounding network frequency response test device

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 A substation grounding grid frequency response testing device shown includes a power supply module 1, a frequency generator module 2 for generating sinusoidal voltage signals of various frequencies, and a power amplification module 3 for power amplification of sinusoidal voltage signals . The voltage and current acquisition module for collecting and measuring the voltage and current of the grounding grid 4. The intelligent control module 5 for controlling the output frequency of the frequency generator module and calculating the impedance of the grounding grid. The voltage and current acquisition module, the intelligent control module, the frequency The generator module and the power amplifier module are connected in sequence;

[0028] The power supply module provides the power supply for each module of the te...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R23/02
Inventor 郑益民邹晓汉李扬胜李伟克杨军李长庚刘洋海
Owner 广东电网有限责任公司韶关供电局
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