Device and system for determining grounding fault of cable
A ground fault and cable technology, applied in the field of electric power engineering, can solve problems such as increasing production costs and affecting normal production, and achieves the effect of saving production costs and facilitating rapid repair operations.
Pending Publication Date: 2022-03-01
PETROCHINA CO LTD
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Problems solved by technology
However, because the off-line detection method requires power outage, it not only affects the normal production, but also increases the production cost
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[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0065] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those skilled in the art.
[0066] In order to make the technical solutions and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.
[0067] In the power distribution system, most ...
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The invention discloses a device and a system for determining a grounding fault of a cable, and belongs to the technical field of electric power engineering. The device comprises a signal detection assembly, a signal control assembly and a fault prompt assembly, a cable located above the ground penetrates through the primary side of a zero-sequence current transformer in the signal detection assembly, and when the cable has a ground fault, the secondary side of the zero-sequence current transformer can generate zero-sequence current; when current passes through the zero sequence current transformer, a triode in a closed loop composed of the bridge rectifier, the signal control assembly, the adjustable resistor, the fixed resistor, the triode and the relay is in saturation conduction and amplifies the current in the circuit, and when equivalent current passes through a relay coil, the relay is closed, and the current in the circuit is amplified. And a first switch and a second switch of the fault prompting assembly are closed, so that an operator on duty can be prompted to carry out first-aid repair work in time when a grounding fault occurs. The device can determine the grounding fault of the cable during the operation of the cable, and saves the production cost.
Description
technical field [0001] The present application relates to the technical field of electric power engineering, in particular to a device and system for determining a ground fault of a cable. Background technique [0002] In the power distribution system, most distribution lines use cables to realize power transmission. Although the cable has the advantages of safety and reliability, due to the manufacturing process, maintenance process, insulation aging, external force damage and other reasons of the cable itself, different types of failures will occur during operation. At present, since cables are usually buried deep underground, ground faults are prone to occur, affecting the normal operation of equipment in the power distribution system. [0003] At present, the power distribution line usually includes multiple cables, for example, 3 to 4 cables. When a ground fault is found in the distribution line in the substation, an offline detection method is usually used to detect a...
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IPC IPC(8): G01R31/52G01R31/58
CPCG01R31/52G01R31/58
Inventor 王普军陈献明张起钧张德新侯万滨袁美玲钟德海徐继富沙泉
Owner PETROCHINA CO LTD