Method of measuring secondary cable transfer impedance caused by ground net impact current

A technology of inrush current and secondary cables, which is applied in the high voltage field, can solve the problems of high experimental cost, limited output capacity, output waveform distortion, etc., and achieve the effect of saving safety measures, reducing experimental cost, and experimental safety

Active Publication Date: 2015-11-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +2
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Problems solved by technology

Due to the large grounding grid, this method requires a very long lead wire, and at the same time, due to the large grounding resistance of the current electrode, the output capability of the key equipment in the experiment - the impulse voltage generator (or impulse current generator) is

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  • Method of measuring secondary cable transfer impedance caused by ground net impact current
  • Method of measuring secondary cable transfer impedance caused by ground net impact current
  • Method of measuring secondary cable transfer impedance caused by ground net impact current

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Example Embodiment

[0034] The method for measuring the transfer impedance of the secondary cable caused by the inrush current of the grounding grid of the present invention includes the following steps:

[0035] (1) Take the actual measurement of a substation as an example, such as figure 1 As shown, two points in the middle of a grounding grid with a side length of 100m in a substation are selected as the grounding points of the impulse voltage generator 1. One grounding point is the current inflow point, and the other grounding point is the current outflow point. Use EMCpro's impulse voltage generator 1;

[0036] (2) Connect the impulse voltage generator 1 to the grounding grid of the substation through the two grounding points selected in step (1);

[0037] (3) Find the midpoint of the connection between the two grounding points of the impulse voltage generator 1;

[0038] (4) On the line connecting the two grounding points of impulse voltage generator 1, find an 80m-long line segment with the midpoi...

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Abstract

The invention discloses a method of measuring secondary cable transfer impedance caused by ground net impact current, comprising accessing an impulse t voltage generator in a transformer station ground net, laying a secondary cable, and using standard impact voltage and current waveforms to inject current into the current ground entry point of the ground net, and to extract current at a current discharge point; employing an oscilloscope to measure the output current waveform of the impulse voltage generator; employing the oscilloscope to measure the potential difference between core wires at any end of the laid secondary cable, and the potential difference between the core wires at the end and the ground net; respectively using 2 to divide the two measured potential differences; and respectively comparing the peak values of the two obtained potential differences with the output current peak values of the impulse voltage generator. The measurement method of the invention can obtain the transfer impedance between core wires of the secondary cable, and the transfer impedance between the core wires and the ground net to be used for assessing grounding system impact characteristics, and guiding grounding engineer construction.

Description

technical field [0001] The invention relates to the field of high-voltage technology, in particular to a method for measuring the transfer impedance of a secondary cable caused by an impact current of a grounding grid, which is used to evaluate the impact of the grounding grid on a secondary cable when it is struck by lightning. Background technique [0002] In order to meet the needs of work and safety in the power system, it is often necessary to connect some parts of the power system and its electrical equipment to the earth, which is grounding. Power system grounding can be divided into three types: working grounding, lightning protection grounding and protective grounding in terms of its purpose. Among them, lightning protection grounding is to avoid the harm of lightning. Lightning protection equipment such as lightning rods, lightning conductors and arresters must be equipped with corresponding grounding devices to guide lightning current into the earth. The groundin...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 肖磊石李谦张波吴锦鹏庄池杰曾嵘何金良陈水明胡军余占清张云董玉玺
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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