Grounding resistance short-distance measurement method and system with compensation correction function

Abstract

The invention relates to a grounding resistance short-distance measurement method and system with a compensation correction function and belongs to the technical field of resistance measurement. The system comprises an alternating-current signal source I, an ampere meter I, a voltmeter I, an alternating-current signal source II, an ampere meter II, a voltmeter II, a current electrode, an auxiliarycurrent electrode and a double-pole double-throw switch; the alternating-current signal source I is connected in series with the ampere meter I, and then the alternating-current signal source I and the ampere meter I are connected in parallel with the voltmeter I, so that a circuit I is formed; the alternating-current signal source II is connected in series with the ampere meter II, and then thealternating-current signal source II and the ampere meter II are connected in parallel with the voltmeter II, so that a circuit II is formed; the circuit I and the circuit II are connected through thedouble-pole double-throw switch; the ampere meter I and the voltmeter I are connected with the current electrode; and the ampere meter II and the voltmeter II are connected with the auxiliary currentelectrode. When the grounding resistance of a grounding grid is measured, the problems of long paying-off distance, high safety risk and large working difficulty of a conventional long-distance method are effectively overcome. The ground potential curve superposition curves of two grounding bodies into which reverse current is injected is corrected, so that measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of resistance measurement, and relates to a method and system for short-distance measurement of grounding resistance with compensation and correction. Background technique [0002] For the measurement of the grounding resistance of the grounding grid, the existing methods can be mainly divided into two types: the long-distance method and the short-distance method. [0003] The measurement circuit for measuring the grounding resistance of the grounding grid by the long-distance method is as follows: figure 1 shown. [0004] In order to ensure measurement accuracy, the distance between the current electrode and the edge of the grounding system under test is required to be at least 4-5 times the diagonal size of the grounding grid. The long-distance method has high measurement accuracy, but for large-scale grounding grids, there are disadvantages such as too long setting-out distance and heavy workload. will...

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Problems solved by technology

However, the numerical calculation has high requirements on the model, and it cannot fully simulate the actual situation of the grounding grid, so the accuracy cannot be guaranteed

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