Small-resistance grounding system line detection device

Abstract

The invention discloses a line detection device for a small-resistance grounding system. The device comprises a shell, a central processing unit, an analog quantity acquisition and conversion circuit,an access port and an output control circuit; an output control circuit is installed at the center of the bottom of the shell, and the central processing unit is arranged on the inner wall of the shell above the output control circuit; the output end of the central processing unit is electrically connected with the input end of an output control circuit; and an analog quantity acquisition and conversion circuit is installed on the inner wall of the shell on the side, away from the output control circuit, of the central processing unit, the output end of the analog quantity acquisition and conversion circuit is electrically connected with the input end of the central processing unit, and air vents are formed in the inner wall of the shell on the two sides of the central processing unit. According to the invention, the phenomenon that the wire is wound when the detection device is used is avoided, the service life of the detection device is prolonged, and the phenomenon that external dust and other substances invade into the shell from the air vent when the detection device is used is reduced.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a line detection device for a small resistance grounding system. Background technique [0002] The neutral point is grounded by a small resistance, which can effectively reduce the overvoltage of the non-faulty phase when the single-phase grounding fault occurs, eliminate the arc overvoltage and some resonant overvoltage, and can use the zero-sequence current protection to quickly select the fault line. The single-phase grounding fault develops into an interphase fault, and the duration of the single-phase grounding fault is controlled within a few seconds, which can significantly reduce the probability of electric shock for personnel and improve personal safety. The method has been popularized and applied, in order to reduce the occurrence of its failure, it is necessary to use the corresponding detection device. [0003] At present, there are various detection devices on...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a small resistance grounding system line detection device to solve the problem that the detection device in the above background technology is inconvenient to carry out interval dredging processing on the line, inconvenient to efficiently dissipate heat from the components inside the housing, and inconvenient to carry out The problem of dust control

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