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An instantaneous ground fault detection method and device for a nuclear power plant

A ground fault and detection method technology, applied in the field of nuclear power plants, can solve the problem that flash insulation faults cannot be effectively located and inspected, and achieves the effect of fast and effective elimination and improved accuracy

Active Publication Date: 2019-11-05
LINGDONG NUCLEAR POWER +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting instantaneous ground faults in nuclear power plants, so as to solve the problem that the prior art cannot effectively locate and inspect short-duration flash insulation faults

Method used

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  • An instantaneous ground fault detection method and device for a nuclear power plant
  • An instantaneous ground fault detection method and device for a nuclear power plant
  • An instantaneous ground fault detection method and device for a nuclear power plant

Examples

Experimental program
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Effect test

Embodiment 1

[0041] figure 1 The implementation flow of the instantaneous ground fault detection method of the nuclear power plant provided by the first embodiment of the present invention is shown, and the details are as follows:

[0042] In step S101 , the first current and the second current corresponding to the positive and negative conductors are simultaneously acquired at multiple predetermined positions of the positive and negative conductors in the branches of the power distribution system.

[0043] Specifically, the power distribution system may be a DC power distribution system or an AC power distribution system. When the power distribution system is an AC power distribution system, parameter information such as the magnitude and frequency of the AC current of the AC power distribution system can be obtained, and subsequent current comparisons, including waveform comparisons, can be performed based on the parameter information. Certainly, for the current comparison in the DC pow...

Embodiment 2

[0056] figure 2 The implementation flow of the instantaneous ground fault detection method of the nuclear power plant provided by the second embodiment of the present invention is shown, and the details are as follows:

[0057] In step S201, the first current and the second current corresponding to the positive and negative wires are obtained at the same time at the positive and negative wires at multiple predetermined positions in the branches of the power distribution system.

[0058] In step S202, it is monitored in real time whether the first current and the second current are the same.

[0059] In step S203, when the first current and the second current are different, a voltage waveform image at the positive and negative wires at the predetermined position is acquired.

[0060] In the actual current measurement process, the noise signal introduced due to environmental interference will cause the current to fluctuate step by step. If a sudden change in current caused by...

Embodiment 3

[0069] image 3 The implementation flow of the instantaneous ground fault detection method of the nuclear power plant provided by the third embodiment of the present invention is shown, and the details are as follows:

[0070] In step S301, the first current and the second current corresponding to the positive and negative wires are obtained at the same time at the positive and negative wires at multiple predetermined positions in the branches of the power distribution system.

[0071] In step S302, it is monitored in real time whether the first current and the second current are the same.

[0072] In step S303, when the first current and the second current are different, store the current waveform diagrams corresponding to the first current and the second current, and the positions and positions corresponding to the first current and the second current / or time.

[0073] Specifically, when it is detected that the first current is different from the second current, the curr...

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Abstract

A nuclear power plant earth fault detecting method and device includes acquiring first current and second current corresponding to a positive lead and a negative lead at the same time in the positive lead and the negative lead at multiple predetermined positions in a branch of a power distribution system; monitoring and judging whether the first current is identical to the second current or not in real time; when the first current and the second current are not identical, acquiring the location of the positive lead and the negative lead where the first current and the second current are not identical and sending the failure information of the location. When the first current and the second current are not identical, near-load end failure can be determined at the location corresponding to the first current and the second current in the leads. Failure locations can be determined quickly according to the predetermined locations and failure location checking accuracy can be improved distinctively, and quick and effective failure elimination is facilitated.

Description

technical field [0001] The invention belongs to the field of nuclear power plants. Background technique [0002] Inside the nuclear power plant, a DC power distribution system is required to meet the power supply requirements of some internal nuclear power plant related equipment. Due to the high reliability requirements for nuclear power plant-related equipment, it is necessary to ensure the stability and reliability of the DC power distribution system, such as ensuring the insulation of the DC power distribution system. When an insulation fault occurs in the DC system, it is required to find the ground fault point in a short time. Eliminate insulation faults. [0003] In order to find the insulation fault point of the DC power distribution system, at present, when the ground insulation fault occurs, a low-frequency AC signal is injected into the DC power distribution system, and then the load of each downstream branch is tested for the existence of the low-frequency AC si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王正斌刘海琪王宝刚何银江
Owner LINGDONG NUCLEAR POWER