A device and method for observing the impact discharge characteristics of soil around a ground rod

Abstract

The invention discloses an apparatus for observing soil impact discharge characteristics of ground rods and method thereof. The apparatus comprises a backflow electrode and a test ground rod. The backflow electrode adopts a coaxial metal cylinder structure. The backflow electrode is divided into three sections: the two ends are symmetrically arranged with equal pressure segments, and the middle straight wire segment is a test section; the equal pressure segments comprises an equal pressure ring, one fourth arc segment and an equal pressure wire segment which are connected in turn. The equal pressure wire segment and the test segment are separated from an insulated cylinder. At the center of the backflow electrode is arranged with the test ground rod. The soil was filled between the test rod and the backflow electrode. The equal pressure segment and the test segment are mutually connected by a ground wire and are connected to ground by the ground wire. The high voltage output terminal of the lightning impulse generator is connected to the grounding rod of the test case and the low voltage output is connected to the ground wire of the return electrode. The apparatus for observing soil impact discharge characteristics of ground rods can obtain the voltage and current relation of the soil central wire-neutral plate discharge, and is used to evaluate the discharge characteristics of the soil around the grounding conductor, and guide the construction of the grounding project.

Description

technical field [0001] The invention relates to the high-voltage technical field, in particular to a device for measuring the voltage-current relationship of soil discharge around a grounding conductor. Background technique [0002] In the power system, for the needs of work and safety, it is often necessary to connect some parts of the power system and its electrical equipment to the earth, which is grounding. [0003] 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. [0004] Because the lightning current is very large, it will generate a high potential gradient in the soil when it flows into the ground thro...

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Problems solved by technology

[0006] 1. Mainly study the discharge characteristics of soil under power frequency, lack of research on the discharge characteristics of soil under lightning transient conditions;

[0007] 2. The form of the discharge gap is mainly tip-plate, tip-tip, spherical-spherical, and the grounding electrode that actually constitutes the grounding device is usually rod-shaped (wire type, such as line pole grounding material) or flat strip (flat strip material) type, such as grounding materials for large grounding devices), lack of discharge characteristic tests for wire-plate gaps

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