Method and device for detecting branch circuit single phase earth faults
A technology for single-phase ground faults and branch lines, applied in the direction of measuring devices, fault locations, emergency protection circuit devices, etc., can solve the problems that inspectors cannot quickly eliminate faults, and cannot quickly detect single-phase ground faults of branch lines
Active Publication Date: 2015-04-01
STATE GRID CORP OF CHINA +3
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Problems solved by technology
[0005] In view of this, the present invention provides a branch line single-phase ground fault detection method and device to overcome the inability of detection personnel to quickly detect the location of the specific single-phase ground fault in the branch line in the prior art. Troubleshooting issues
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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] For reference and clarity, descriptions, abbreviations or abbreviations of technical terms used in the following text are summarized as follows:
[0051] ZCT: Zero Current Transition, zero current transition.
[0052] Please refer to the attached figure 2 , which is a schematic flowchart of a branch line single-phase ground fault detection method provided by an embodiment of the present invention, the method comprising:
[0053] Step S201: Obtain the...
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The invention provides a method and a device for detecting branch circuit single phase earth faults. The method includes: obtaining a first electric current in a branch circuit; judging whether the first electric current is not less than a preset electric current so as to obtain a first judging result; judging whether the first electric current satisfies a preset condition so as to obtain a second judging result; determining that single phase earth faults occur on the load side of the branch circuit when the first judging result states clearly that the first electric current is not less than the preset electric current and the second judging result states clearly that the first electric current dissatisfies the preset condition; and determining that the single phase earth faults occur on the power source side of the branch circuit when the first judging result states clearly that the first electric current is less than the preset electric current and the second judging result states clearly that the first electric current dissatisfies the preset condition. Specific fault positions of the branch circuit can be obtained by using the method and the device, and accordingly detection personnel can quickly remove the faults conveniently.
Description
technical field [0001] The invention relates to the field of automatic control, in particular to a method and device for detecting single-phase grounding faults of branch lines. Background technique [0002] With the rapid development of the power grid, people have higher and higher requirements for the reliability of the safe power supply of the power distribution system. The connection mode of the power grid in the power distribution system in the Arc coil grounding method or neutral point grounding method with small current. [0003] When single-phase grounding occurs in the power distribution system, the distributed capacitive current of the line reflected by the single-phase grounding fault current is often very small, the symmetry of the line voltage of the power distribution system is not damaged, and the power grid is still allowed to continue to operate for a period of time. It is 1h~2h. In order to prevent the expansion of power distribution system accidents, the ...
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IPC IPC(8): G01R31/02G01R31/08H02H7/26
Inventor 马帮文谢佳家陈雷姜志勇宁鑫珅
Owner STATE GRID CORP OF CHINA