Flexible DC grid insulation fault detection device and system
A flexible DC and detection device technology, applied in the field of power systems, can solve the problems of low reliability of DC power grids
Active Publication Date: 2021-05-11
SHENZHEN POWER SUPPLY BUREAU
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[0004] Based on this, it is necessary to provide a flexible DC grid-to-ground insulation fault detection device and system for the traditional method of disconnecting each branch one by one to find the grounding branch and the low reliability of the DC grid operation.
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[0057] In order to make the purpose, technical solution and advantages of the present application clearer, a DC power distribution system of the present application and its ground insulation fault detection method will be further described in detail through the following embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.
[0058] See figure 1 In one embodiment of the present application, a device 10 for detecting an insulation fault to ground of a flexible direct current grid is provided, and the flexible direct current grid includes a busbar and a plurality of branches electrically connected to the busbar. The detection device 10 includes a parameter detection element 100 and a relay protection element 200 .
[0059] The parameter detection element 100 is electrically connected to the positive pole of the bus b...
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The present application provides a flexible DC power grid insulation fault detection device and system. The detection device includes a parameter detection element and a relay protection element electrically connected to the parameter detection element. The parameter detection element is used to detect the bus positive voltage, the bus negative voltage, the branch positive current and the branch negative current. According to the positive voltage of the bus, the negative voltage of the bus, the positive current of the branch and the negative current of the branch, the relay protection element obtains the magnitude of the DC component of the common mode voltage of the bus, and obtains the magnitude of the third harmonic common mode current vector of each branch , and then determine whether any of the multiple branch circuits has an insulation fault to ground. This device uses parameter detection elements to detect DC voltage bias, and uses relay protection elements to detect the third harmonic common mode current of each branch to diagnose the ground fault branch, thus avoiding the need to disconnect each branch one by one to find the fault branch The resulting short-term power outage of other branches improves the reliability of the DC power grid.
Description
technical field [0001] The present application relates to the field of electric power systems, in particular to a device and system for detecting a ground insulation fault of a flexible direct current grid. Background technique [0002] In the flexible DC power distribution system, if the AC side is grounded with high resistance, the DC side does not need other grounding measures. At this time, if a small ground fault occurs on the DC side, it will cause a DC voltage bias on the DC side, but the short-circuit current is small. The flexible DC power distribution system may bring huge safety hazards due to insulation damage, causing electrical safety accidents such as electric shock and fire. Therefore, insulation monitoring methods are often used to prevent them. [0003] In order to improve the reliability and accuracy of the insulation detection of the DC power distribution system, the traditional method usually uses disconnecting each branch one by one to find the groundin...
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IPC IPC(8): G01R31/08G01R19/165
CPCG01R19/16538G01R31/086Y04S10/52
Inventor 王静赵宇明李艳刘国伟秦文康徐习东
Owner SHENZHEN POWER SUPPLY BUREAU