Device and method for simultaneous detection of DC feeder-to-ground insulation reduction and AC break-in
A technology of ground insulation and AC intrusion, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of inconvenient intensive, networked and intelligent management, huge wire consumption, and increased line nodes and other issues, to achieve the effect of improving intelligent monitoring capabilities, reducing related lines, and improving the level of intelligent monitoring
Active Publication Date: 2019-07-05
CHENGDU GUONENG LONGYUAN TECH
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Problems solved by technology
The analog signal line is point-to-point output, the line control is single and independent, the line nodes increase, the line structure is complicated, the wire consumption is huge, and it is not convenient for intensive, networked and intelligent management
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[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] In the following description, references to "one embodiment," "an embodiment," "an example," "example," etc. indicate that such described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitations, but not every embodiment or example necessarily includes the specific feature, structure, characteristic, property, element or limitation. Additionally, repeated use of the phrase "according to one embodiment of the present application" does not necessarily refer to the same embodiment, although it may.
[0024] For simplicity, some technical features known to those skilled in the art are omitted from the following description.
[0025] According to an embodiment of the prese...
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The present invention provides a device and method of simultaneously detecting DC feeder line ground insulation reduction and AC channeling. The device comprises an AC / DC control circuit, a multifunctional sensor and a monitoring module, the monitoring module comprises a leakage current measurement circuit and an AC measurement circuit, and the multifunctional sensor is composed of a first winding W1, a second winding W2 and a third winding W3. The second winding W2 and the third winding W3 are connected with the leakage current measurement circuit, and the first winding W1 is connected with the AC measurement circuit. A signal acquisition circuit adopted by the present invention can acquire the signals accurately and inerrably, and can send out a signal to a central processor of a main control computer timely and effectively in 1-10 seconds once a fault phenomenon, such as the short circuit, the open circuit, the electric leakage, the AC channeling, etc., occurs in a DC feeder line system, so that the system can respond rapidly to cut off a faulted circuit, thereby protecting the safe operation of a whole DC system.
Description
technical field [0001] The invention specifically relates to a device and a method for simultaneously detecting insulation reduction of a DC feeder to ground and AC intrusion. Background technique [0002] In the operation of the existing power system in our country, the phenomenon of alternating current entering the direct current system occurs continuously, which has seriously affected the normal operation of the power system. Statistics from relevant domestic data confirm that due to the AC mixing into the DC system, or the AC component index exceeding the standard, many major accidents such as relay protection device failures and malfunctions have been caused, and large economic losses have been caused. Therefore, timely detection of AC / DC hybrid line accidents and accurate judgment of the location of mixed-in branches and mixed-in busbars have become major problems that my country's power system urgently needs to solve. It is imminent to invent and develop this kind of...
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IPC IPC(8): G01R19/25G01R27/08G01R31/12
CPCG01R19/25G01R27/08G01R31/1272
Inventor 黄飞王华林
Owner CHENGDU GUONENG LONGYUAN TECH