Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges

A low-voltage power distribution system, grounding fault technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of unintended effects of the integrity and sensitivity of the implementation scheme, lack of system integrity, etc., to achieve small size, Simple installation and simple implementation

Active Publication Date: 2014-03-26
CHINA NUCLEAR POWER ENG CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] At present, in the design of ground fault protection for industrial and civil low-voltage power distribution, although grounding and the installation of residual current device (RCD) are considered, it lacks the integrity of the system, and the implementation scheme has no expected effect in terms of integrity and sensitivity.

Method used

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  • Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges
  • Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges

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Embodiment

[0019] In the embodiment of the present invention, such as figure 1 As shown, the ground fault design of the full power supply range of the low-voltage power distribution system of the present invention includes:

[0020] Set up a current transformer on the connecting line between the neutral point of the transformer and the grounding system, and configure a high-sensitivity grounding fault relay.

[0021] Such as figure 2 As shown, the ground fault protection of the low-voltage power distribution system of the nuclear power plant only sets the current transformer 001TI on the connection line between the neutral point of the transformer and the grounding system, and 001TI uses a conventional current transformer without special technical requirements, for example: 5A, the current transformer 001TI signal acts on the high-sensitivity ground fault relay 001XI, and its residual current protection detects the phasor sum of the three-phase current plus the neutral line current, th...

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Abstract

The invention belongs to the nuclear plant design technology, and particularly relates to a ground fault protection method of a nuclear plant low-voltage power distribution system in all power supply ranges. According to the method, a ground protective relay is arranged on the connecting line of a neutral point of a medium-and-low-voltage distribution transformer and a ground system. The ground protective relay is a two-stage electric leakage relay, a first-stage electric leakage warning function is achieved so as to prevent ground arc fires in all the power supply ranges, and a second-stage ground fault tripping function is achieved so as to carry out ground fault protection on the whole low-voltage power distribution system. Residual current protective devices in cascading matching are arranged in the power distribution system, a main feeder circuit is provided with an arc-fire protector, a rear end circuit is provided with a body electric shock protector, and multiple layers are standby. By means of the method, the problems of ground arc fires and indirect contact electric shock are solved in the nuclear plant low-voltage power distribution system in all the power supply ranges, and safety of the low-voltage power distribution system is effectively guaranteed.

Description

technical field [0001] The invention belongs to the design technology of nuclear power plants, and in particular relates to a grounding fault protection method in the full power supply range of a low-voltage power distribution system of a nuclear power plant. Background technique [0002] The ground fault protection design of low-voltage power distribution system is a very complicated system engineering, and its design goal is to solve two aspects of prevention: [0003] First, prevent personal electric shock; when an electrical device has a ground fault due to insulation damage, the exposed conductive part of the originally uncharged electrical equipment will be charged with a fault voltage to the ground, thereby causing the person to suffer an electric shock. The indirect contact electric shock accident caused by the ground fault is The most common frequent electric shock accident. [0004] Second, prevent electrical fires; as far as electrical disasters are concerned, ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 陈怀宇范君龙王劲朱丰林
Owner CHINA NUCLEAR POWER ENG CO LTD
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