Improved method for measuring impulse grounding resistance of electric power system

Abstract

The invention relates to a method for measuring impulse grounding resistance of an electric power system, in particular to an improved method for measuring the impulse grounding resistance of the electric power system, which is used for researching the impulse characteristics of concentrated grounding electrodes with different structures. Transient stable-state impulse grounding resistance is defined as the resistance of a grounding body at the half-peak moment of impulse current. The improved method for measuring the impulse grounding resistance of the electric power system comprises the following steps: firstly, generating the impulse current by an impulse current generator and injecting the impulse current into the earth; acquiring voltages at both ends of the concentrated grounding electrodes with different structures and voltage electrodes and current at a current injection point by taking an impulse voltage divider and a current sensor as conversion devices by utilizing a digital storage oscilloscope; and processing acquired data through matrix laboratory (MATLAB) software to obtain the transient stable-state impulse grounding resistance of the grounding electrode under certain impulse current. The transition-state impulse grounding resistance disclosed by the invention is capable of actually reflecting the current dispersing capacity of the grounding body under the impulse current and is capable of actually describing the maximum potential rise of the grounding body under the amplitude of the impulse current.

Description

Technical field [0001] The invention relates to a method for measuring the impact grounding resistance of a power system, in particular to an improved measurement method for the impact grounding resistance of a power system, which is used for studying the impact characteristics of centralized grounding electrodes with different structures. Background technique [0002] Grounding resistance refers to the resistance when power frequency or DC current flows, usually called power frequency (or DC) grounding resistance; for lightning protection grounding, the resistance when lightning impulse current flows is called impact grounding resistance. [0003] In order to study the impact characteristics of lightning current leakage through the grounding body, people have been devoting themselves to evaluating it by obtaining the impact grounding resistance. The specific methods are as follows: [0004] A. Establish a mathematical and physical model for the specific grounding device, an...

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Problems solved by technology

[0009] Due to the large size and non-uniform structure of the actual grounding body in the power system, and the high frequency of the lightning current, the inductance effect is significant, so the impact characteristics of the grounding body using the usual sense of impact grounding resistance are different from the actual situation.

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