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Leak current fault detecting method and device

A detection method and voltage detection technology, applied in the electric power field, can solve problems such as low leakage fault detection efficiency, and achieve the effect of solving the low detection efficiency and improving the detection efficiency.

Inactive Publication Date: 2015-04-15
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a leakage fault detection method and device to at least solve the technical problem of low detection efficiency of leakage faults in the related art

Method used

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  • Leak current fault detecting method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0026] figure 1 It is a flow chart of an optional leakage fault detection method in the embodiment of the present invention. Such as figure 1 As shown, a detection method for leakage faults, including:

[0027] S102: Obtain the current voltage value between each of the three-phase lines of the power transmission line and the ground;

[0028] S104: Detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold in the three-phase line, wherein the normal voltage value is the phase line between the phase line and the ground when no leakage fault occurs on the phase line Voltage value;

[0029] S106: If there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold among the three-phase lines, mark the detected phase line as a phase line with a leakage fault.

[0030] figure 2 It is a circuit structur...

Embodiment 2

[0038] image 3 It is a flow chart of another leakage fault detection method optional in this embodiment of the present invention.

[0039] Such as image 3 As shown, optionally, obtaining the current voltage value from the voltage detection component arranged between each of the three-phase lines and the ground includes:

[0040] S202: Send a voltage acquisition request to the voltage detection component;

[0041] S204: Receive the current voltage value returned by the voltage detection component.

[0042] For example, send a voltage acquisition request to the voltage detection component voltmeter 11 of the a-phase line, b-phase line and c-phase line, and the voltmeter 11 will return the current voltage obtained in real time. The voltages of the a-phase line and the c-phase line are 218 (V) and 212 (V) respectively, so that the difference between the voltage of the a-phase line and the normal voltage value is 2 (V), within the predetermined threshold range, The difference...

Embodiment 3

[0045] Figure 4 It is a structural block diagram of an optional leakage fault detection device in this embodiment of the present invention.

[0046] Such as Figure 4As shown, optionally, it includes: an acquisition module 1, which is connected to the three-phase lines of the power transmission line respectively, and is used to acquire the current voltage value between each of the three-phase lines of the power transmission line and the ground; the detection module 2, and The acquisition module 1 is connected, and is used to detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold value in the three-phase line according to the acquired current voltage value, wherein the normal voltage value is the phase line without leakage The voltage value between the phase line and the ground at the time of fault; the marking module 3 is connected to the detection module 2, and is used to...

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Abstract

The invention discloses a leak current fault detecting method and device. The method includes the steps of acquiring a current voltage value of each of three phase lines of a power transmission line to a ground; detecting whether or not the phase lines having a difference between the current voltage value and a normal voltage value being greater than a preset threshold exist in the three phase lines; if yes, marking the detected phase lines as phase lines having leak current fault. The current voltage value of each of the three phase lines of the low-tension distribution network power transmission line to the ground is acquired; according to the fact of whether or not the phase lines having the difference between the current voltage value and the normal voltage value being greater than the preset threshold exist in the detected phase lines, the phases having the leak current fault are judged; thus, the technical problem that the related part of leak current fault detection is low in detection efficiency is solved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a leakage fault detection method and device. Background technique [0002] During the operation of low-voltage lines, it is often encountered that the leakage switch of the line is tripped due to the failure of the user's electrical equipment. In the fault finding, in order to narrow the search range, the method of phase-by-phase picking and trial delivery is usually adopted to determine the faulty phase, and then the fault point is searched for the faulty phase. [0003] However, using the above method not only takes a long time to search and is inefficient, but also has a strong impact on the user's electrical equipment due to repeated trial delivery. [0004] At present, no effective solution has been proposed for the above technical problems. Contents of the invention [0005] Embodiments of the present invention provide a leakage fault detection method and device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 张敬财池建峰贺玉强吴建华刘旸
Owner STATE GRID CORP OF CHINA
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