Apparatus for observing soil impact discharge characteristics of ground rods and method thereof

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 technical field of high voltage, in particular to a device for measuring the relationship between voltage and current of soil discharge around a grounding conductor. Background technique [0002] In the power system, for the sake of work and safety, it is often necessary to connect some parts of the power system and its electrical equipment to the ground, which is grounding. [0003] Power system grounding can be divided into three types: working grounding, lightning protection grounding and protective grounding. Among them, lightning protection grounding is to avoid the harm of lightning, and lightning protection equipment such as lightning rods, lightning protection lines and lightning arresters must be equipped with corresponding grounding devices to guide lightning current into the earth. [0004] Due to the large lightning current, a high potential gradient will be generated in the soil when it flows into the ground t...

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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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