Device and method for observing three-dimensional discharge morphology of soil around ground rod

Abstract

The invention discloses a device and method for observing the three-dimensional discharge appearance of soil around the ground rod, wherein the device for observing the three-dimensional discharge appearance of the soil around the ground rod includes an insulating table, a metal cylinder, a ground rod, soil, X-ray film and lightning shock generator; the metal cylinder is vertically arranged on the upper surface of the insulating table; the grounding rod passes through the insulating table vertically, the grounding rod is located in the metal cylinder and is coaxial with the metal cylinder, and the grounding rod The upper end protrudes from the upper end of the metal cylinder; the soil is filled in the metal cylinder; multiple X-ray films are spaced apart along the axial direction of the ground rod and vertically sleeved on the ground rod and buried in the soil; the lightning impulse generator The high-voltage end is used for electrical connection with the upper end of the ground rod, and the low-voltage end of the lightning impulse generator is used for electrical connection with the metal cylinder. The invention can avoid affecting the flow path of the current in the soil, realizes the real three-dimensional discharge shape capture of the soil around the ground rod, and has a simple structure.

Description

Technical field [0001] The present invention relates to the field of high-voltage electrical technology, and more particularly to a device and method for observing three-dimensional discharge formation around the ground rod. Background technique [0002] Every year, it has been frequent in lightning strikes every year, and the harm of lightning strikes is huge. Grounding is a key measures for lightning protection. Lightning protection equipment such as lightning protection needles, lightning lines and arresters must be equipped with corresponding grounding devices to import lightning current into the earth. Since the lightning current is very large, it will produce a high potential gradient in the soil when the grounding device is concentrated. When the soil is strong, the discharge will occur during the soil. The discharge of the soil will greatly affect the lightning impact characteristics of the grounding apparatus, resulting in non-linear changes in the grounding resistance o...

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Problems solved by technology

[0006] 3. Although the X-ray film can be used to capture the appearance of the soil discharge around the ground rod in the soil, but because the X-ray film and the ground rod are arranged in parallel and close to each other, the X-ray film will hinder the flow path of the current in the soil , resulting in a large difference between the discharge around the ground rod and the actual situation;

[0007] 4. Chongqing University observes soil discharge by taking pictures with a space X-ray camera. However, due to the very fast attenuation of X-rays, this method can only capture the strong discharge of the main discharge channel, and cannot observe the discharge branches before and after the formation of the main channel.

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