Device and method for observing three-dimensional discharge morphology of soil around grounding body

Abstract

The invention discloses a device and a method for observing the three-dimensional discharge morphology of soil around a grounding body. The device for observing the three-dimensional discharge morphology of the soil around the grounding body comprises an insulating table, a metal cylinder, a grounding rod, the soil, X-ray films, and a lightning impulse generator. The metal cylinder is vertically arranged on the upper surface of the insulating table; the grounding rod vertically penetrates through the insulating table, the grounding rod is located in the metal cylinder and is coaxial with the metal cylinder, and the upper end of the grounding rod extends out of the upper end of the metal cylinder; the metal cylinder is filled with soil; the plurality of X-ray films are spaced along the axial direction of the grounding rod, are vertically sleeved on the grounding rod and are buried in soil; and the high-voltage end of the lightning impulse generator is used for being electrically connected with the upper end of the grounding rod, and the low-voltage end of the lightning impulse generator is used for being electrically connected with the metal cylinder. According to the invention, theinfluence on the flowing path of the current in the soil can be avoided, the real three-dimensional discharge morphology capture of the soil around the grounding rod is realized, and the structure issimple.

Description

technical field [0001] The invention relates to the technical field of high-voltage electricity, in particular to a device and a method for observing the three-dimensional discharge morphology of soil around a grounding body. Background technique [0002] my country suffers from frequent lightning strikes every year, and the damage caused by lightning strikes is huge. Grounding is a key measure for lightning protection. Lightning protection equipment such as lightning rods, lightning protection wires and lightning arresters must be equipped with corresponding grounding devices to conduct lightning current into the ground. Due to the large lightning current, when the grounding device is concentrated and scattered into the ground, a high potential gradient will be generated in the soil. When the withstand field strength of the soil is exceeded, the discharge phenomenon will occur in the soil. The discharge of the soil will greatly affect the lightning impulse characteristics...

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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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