Device for reducing step voltage of neutral point grounding electrode

Abstract

The invention relates to a device for reducing step voltage of a neutral point grounding electrode. The device is characterized in that an insulation grounding conducting wire rod is arranged between a grounding electrode buried underground and a transformer neutral point joint; the insulation grounding conducting wire rod consists of a middle electrical conductor and an insulation external layersurrounding the middle electrical conductor; the end C of the middle electrical conductor of the insulation grounding conducting wire rod is connected with the grounding electrode buried underground,and the end S of the middle electrical conductor of the insulation grounding conducting wire rod is connected with the transformer neutral point joint; and the vertically-buried underground depth of the insulation grounding conducting wire rod is more than or equal to the spanning distance of 0.8m. The device for reducing the step voltage of the neutral point grounding electrode, provided by the invention, has the advantages of being capable of being applied to the grounding systems of various lightning arresters in an extending manner, reducing the step voltage around the grounding wires when the lightning arresters work, and decreasing the harm to people or livestock, caused by the most dangerous areas of the step voltage, to the minimum.

Description

technical field [0001] The invention relates to the grounding system technology in the field of power supply, in particular to a device for reducing the step voltage of a neutral point grounding electrode. Background technique [0002] For specific areas such as mines with relatively thin soil layers, sandy soil layers, and many rocks, according to the current standard installation, a bare wire without insulation requirements should be used to connect the grounding electrode below the grounding wire. In order to meet the ground resistance R E ≤4 Requirements, usually adopt measures to increase the buried depth L and increase the geometric size of the ground electrode. It is usually required that the ground electrode be buried at a depth of about L=1.5m. The main purpose is to reduce the current density on the ground surface by reducing the ground resistance value, and finally ensure the safety of the step voltage. However, the above measures have little effect, and ...

AI Technical Summary

Problems solved by technology

When the human body touches the bare neutral point grounding wire, the current that the human body will pass is about 11 milliamps. When the electric shock time exceeds 10 seconds, the human body has entered the threshold area that is not easy to get rid of. This standard installation of the grounding electrode is suitable for There is no absolute security for personnel

[0003] In addition to the above-mentioned contact injury to the human body, this grounding device also has another potential danger to the human body around the neutral point grounding device - step voltage injury

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