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Control device for residual current of low-voltage power grid

A residual current and control device technology, which is applied to circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as inability to detect line insulation, and shorten troubleshooting time , Improve the reliability of power supply and increase the effect of benefit

Inactive Publication Date: 2008-03-19
HENAN KAIQI POWER IND
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, thereby providing a low-voltage power grid residual current control device with scientific design, low cost, high power supply reliability, and personal safety. Undetectable defects in line insulation for tripping and running

Method used

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  • Control device for residual current of low-voltage power grid
  • Control device for residual current of low-voltage power grid
  • Control device for residual current of low-voltage power grid

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Embodiment Construction

[0035] In order to make the technical solution of the present invention clearer, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] As shown in Figure 1, a low-voltage power grid residual current control device includes a residual current controller 1, a zero-line grounding detector 2, an overvoltage detector 3, an on-line monitor 4 for phase line and neutral line insulation, and a zero-sequence current detection A controller 5, a time controller 6, a neutral point grounding wire DN, a lightning arrester F, an actuator 7 controlled by the time controller 6, and a load switch Q controlled by the actuator 7;

[0037]Wherein, the zero-line grounding detector 2, the overvoltage detector 3, and the zero-sequence current detection controller 5 are connected to the time controller 6 and provide external line information for it, and the residual current controller 1 includes a residual ...

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Abstract

The invention provides a control device for residual current in a low voltage power grid, and comprises a residual current controller, a zero line grounding detector, an overvoltage detector, a zero-sequence current detection controller, a time controller, an actuating member controlled by the time controller, and a load switch controlled by the actuating member, wherein the zero line grounding detector, the overvoltage detector and the zero-sequence current detection controller are connected with the time controller, which comprises a time relay; and the residual current controller comprises a potentiometer, a residual current relay, a closed contactor of the time replay in the time controller and a normally open contactor and a normally closed contactor of the residual current relay. The device has the advantages of scientific designing, low cost, high power supply reliability, and assurance of personal safety, and overcomes the shortcomings of the existing residual current protector, including frequently tripping and non-detectable line insulation during operation at the same time.

Description

technical field [0001] The invention relates to a line leakage current protection device used in the low-voltage side of 6 and 10kV distribution transformers, in particular to a low-voltage power grid residual current control device. Background technique [0002] At present, according to the technical regulations of the power system, various types of residual current protection devices are generally installed on the low-voltage side of 6 and 10kV distribution transformers, but in actual operation, the protection effect of such protection devices is not ideal. The main reason is that when the human body touches the phase line on the line to ground, the voltage the human body bears is a relatively low potential, and the current passing through the human body depends on the human body's own conditions (such as height, age, fat and thin, etc.) and the environment of the electric shock site (such as: soil resistivity, air humidity, water or air, etc.), whether personal safety can...

Claims

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Application Information

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IPC IPC(8): H02H3/14H02H3/20H02H3/32H02H9/02
Inventor 李志学陈家斌高健陈蕾
Owner HENAN KAIQI POWER IND
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