Impact performance simulation test method and device for grounding body with large simulated size and large amplitude value

Abstract

The invention provides an impact performance simulation test method and a device for a grounding body with a large simulated size and a large amplitude value. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value comprises a simulated grounding body, four impulse current generator which are symmetrically arranged in a distributive mode, a matching charging loop, four discharging loops, a circular-ring-shaped backflow electrode, a group of wave modulation inductor and wave modulation resistor and a coaxial cylinder type current divider. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value is characterized in that the simulated grounding body which is arranged in the center of an impact field is embedded underground; the four impact current generators are symmetrically arranged on the periphery of the impact field; output ends of the impact current generators are connected to a high frame which is arranged in the center of the impact filed through four overhead aluminum pipes to perform confluence and then are connected to the simulated grounding body through the wave modulation resistance, the wave modulation inductance and the coaxial cylinder type current divider. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value has the advantages of satisfying simulation test of the large-sized grounding body under the impact current with the large amplitude value which is similar to real thunders, being convenient to operate, large in power capacity, high in amplitude value of the output impact current, multiple in wave shape, flexible and multiple in adaption and the like.

Description

technical field [0001] The present invention relates to the technical field of high-voltage testing, in particular to the impact characteristics of the grounding body (including tower grounding device, substation grounding grid, etc.) test method. Background technique [0002] Overhead transmission line towers, substations, etc. are equipped with grounding devices or grounding grids (hereinafter collectively referred to as grounding bodies) to provide leakage channels in case of faults. When subjected to lightning strikes, the impact current is released into the soil through the grounding body. On the one hand, a high potential is generated on the grounding body, which may extend to the top of the tower and cause insulation flashover to cause tripping failure. On the other hand, a potential gradient is formed in the soil. It endangers the safety of the human body and grounding equipment standing on the ground, and even threatens the safety of secondary equipment in the subs...

AI Technical Summary

Problems solved by technology

It is difficult to effectively study the distribution characteristics of the diffuse current and the inductance effect in the impact characteristics of the grounding body during the small-scale simulation

Moreover, in these tests, the energy of the impulse power supply is usually small, and the impulse current generated is also very small, which is far from the actual lightning current.

[0005] The Chinese invention patent "Large current outdoor real-type simulation test method for lightning impulse characteristics of grounding device" (application number: 201110272119.0) proposes a real-type simulation test method for grounding devices. Although the size of the grounding body can reach the actual size, its : ①The wiring is long and requires a huge space, and due to the large inductance of the wiring, it is diffic

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