Grounding simulation testing device and method

Abstract

The invention discloses a grounding simulation testing device and a grounding simulation testing method. The grounding simulation testing device consists of a transparent container, a transparent liquid medium and an equivalently-contracted grounding device model. The method comprises the following steps of: simulating the variation of earth resistivity by adjusting the resistivity of the liquid medium in the transparent container; simulating non-uniform distribution of soil resistivity by arranging a horizontal or vertical insulated spacer layer in the transparent container; simulating grounding devices of different types by changing the shape of the grounding device model; simulating different grounding device types or the dispersion processes and dispersion mechanisms of different soil structures flowing through working frequency, direct-current and lightning impulse current by arranging working frequency, direct-current and impact testing power supplies; embedding a sampling sensor; measuring needed testing parameters; and recording a testing process through a video camera. The grounding simulation testing device and the method have the advantages of simple and compact structure, easiness in operating and high equivalence.

Description

technical field [0001] The invention mainly relates to the field of lightning protection and grounding, in particular to a grounding simulation test device and method. Background technique [0002] The grounding device is one of the most important links in lightning protection technology. When a grounding short-circuit fault occurs, when the power frequency grounding short-circuit current and lightning impulse current enter the ground through the grounding device, the current distribution on the grounding electrode is uneven, and With the different state parameters such as the shape, burial depth and shielding coefficient of the grounding device, the distribution of the grounding current is different, and the local current density at the grounding electrode reaches the maximum value, resulting in the concentration of the local electric field and the increase in the ground potential, resulting in dangerous Touch voltage and step voltage, at this time, if someone moves nearby,...

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Problems solved by technology

Although this method is easier to implement than the real small impact current method on site, the sand tank is covered with iron sheets, and the soil is simulated with fine sand, which uses non-transparent materials, which is not convenient for observing the spark discharge phenomenon of the soil; The method of heating fine sand and adding water or salt water to simulate the change of soil resistivity is not easy to operate and the accuracy is difficult to grasp; the device provided by this method is fixed in one place and cannot be moved, and it is inconvenient to connect with a large test power supply; this method cannot Reflect the uneven distribution of soil resistivity along different directions

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