Layered soil dynamic resistance characteristic testing method under different water contents

Abstract

The invention discloses a layered soil dynamic resistance characteristic testing method under different water contents. The method comprises a step of building of a testing system. The testing systemcomprises a soil box with a left copper electrode and a right copper electrode, a digital controller and a drip irrigation device and the like capable of realizing accurate control on a water contentin the box; the output end of an impulse current generator is connected to a high voltage end of a voltage divider, and the high voltage end of the voltage divider is connected with the left copper electrode; the right copper electrode is connected with the grounding end of the impulse current generator; and insulation baffles are also included to divide the soil box to more than two pieces of space from left to right. The testing method also comprises steps of soil filling, water content control, evaluation of voltage and current of a soil ample under the current water content, evaluation ofsoil dynamic resistance characteristics and the like. The surrounding soil horizontal layering working condition of a grounding system can be effectively simulated, the water content can be accuratelycontrolled, and the correlation between the water content in the layered soil and the soil dynamic resistance can be analyzed.

Description

technical field [0001] The invention belongs to the technical field of electric power system grounding, and in particular relates to a test method for dynamic resistance characteristics of layered soil under different water contents. Background technique [0002] When the transmission line tower is struck by lightning, due to the existence of the grounding resistance of the tower, a high potential will be generated on the tower body. Excessively high potential will cause the tower to counterattack the transmission line, which will cause accidents such as line tripping and reduce the stability of the power system. and reliability. The main function of the transmission line tower grounding device is to effectively discharge the lightning current into the ground when the tower top or the lightning protection line is struck by lightning, so the current flowing through the grounding device is mainly the lightning impulse current. Due to the large amplitude and high energy of the...

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Problems solved by technology

These factors make the dynamic characteristics of the soil more complicated under the action of high-frequency and large impulse currents. Among them, the soil moisture content often affects the dynamic characteristics of soil resistance to a large extent, and has a great impact on the impact transient characteristics of the entire grounding system.

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