Distribution line adaptive reclosing method, and fault property identification method and device
A power distribution line and reclosing technology, applied in circuit devices, emergency protection circuit devices, fault locations, etc., can solve problems such as unreliable reclosing control, and achieve the effect of improving reliability.
Inactive Publication Date: 2020-05-15
XUCHANG XJ SOFTWARE TECH +2
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[0005] The purpose of the present invention is to provide a distribution line adaptive reclosing method, fault nature identification method and device, which are used to solve the problem of unreliable reclosing control when any sampling information is inaccurate due to the large amount of collected information
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[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] Embodiment of distribution line adaptive reclosing control device:
[0038] This embodiment provides a distribution line adaptive reclosing control device, such as figure 1 As shown, it includes an energy storage capacitor C, a capacitor input circuit, a voltage detection module, a current detection module, and a main control unit. The main control unit is provided with a communication port for communicating with the feeder terminal to obtain the fault type. The main control unit samples the connection voltage detection module and the current detection module, and the control connects the capacitor input circuit.
[0039] Such as figure 1As shown, the capacitor input circuit includes a first connection line, a second connection li...
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The invention relates to a distribution line adaptive reclosing method and a fault property identification method and device, and the method comprises the steps: inputting capacitors into two corresponding phase-to-phase loops where a fault happens if an asymmetric phase-to-phase short-circuit fault happens; if a symmetrical three-phase short-circuit fault occurs, putting capacitors to any two corresponding phase-to-phase loops; detecting the capacitor voltage and / or the capacitor current after the capacitor is input, and judging whether the capacitor voltage and / or the capacitor current meetsa permanent fault identification criterion or not; if so, determining that a permanent fault occurs in the line, otherwise, determining that an instantaneous fault occurs in the line; when a permanent fault occurs in the line, locking the reclosure, and when an instantaneous fault occurs in the line, opening the reclosure. According to the method, only the transient characteristics of the capacitor voltage and the capacitor current need to be judged, and when one quantity cannot be accurately obtained, the other quantity can be adopted to judge the fault type, so that the reliability of reclosing control is effectively improved.
Description
technical field [0001] The invention relates to an adaptive reclosing method for distribution lines, a fault property identification method and a device, and belongs to the technical field of relay protection. Background technique [0002] Since most of the line faults are transient faults, when a transient fault occurs on the line, reclosing can quickly restore the power supply of the system, which greatly improves the power supply reliability of the power grid. However, when a permanent fault occurs on the line, the reclosing action will bring a second impact to the system, which is not conducive to the service life of the circuit breaker and the stability of the grid itself. [0003] The Chinese patent application document with the application publication number CN107394757A discloses a method for identifying no faults before phase-to-phase faults in the distribution network. It is cumbersome, involves many parameters, and requires very complicated calculations. The cum...
Claims
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IPC IPC(8): G01R31/08H02H1/00H02H3/05H02H3/06H02H7/26
CPCG01R31/085H02H7/26H02H7/261H02H3/06H02H3/066H02H3/05H02H1/0007
Inventor 吴水兰张建雨孟乐李俊刚庞建伟郭晓宁刘洋姜睿智崔龙卫常彦彦冀娟陈晓民
Owner XUCHANG XJ SOFTWARE TECH