Substation and transmission line fault protection method and device and detection method and device
A transmission line, fault protection technology, applied in emergency protection circuit devices, fault locations, measurement devices, etc., can solve the problem of long remote fault removal time
Active Publication Date: 2019-12-03
XUCHANG XJ SOFTWARE TECH +5
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Problems solved by technology
[0003] The purpose of the present invention is to provide a transmission line fault protection method to solve the problem that the remote fault removal time is too long when the line loses the main protection
The invention also provides a transmission line fault protection device, which is used to solve the problem that the remote fault removal time is too long after the line loses the main protection
The present invention also provides a substation to solve the problem that the remote fault removal time is too long when the line in the substation loses the main protection
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[0039] Example of substation:
[0040] Such as figure 1 As shown, the present embodiment provides an electric power system, including three substations, respectively the first substation 1, the second substation 4 and the third substation 5, wherein the first substation 1 is provided with a first bus 2, the first The bus 2 is connected with the first line L1, the second line L2 and the third line L3, the second substation 4 is provided with the second bus 6, the third substation 5 is provided with the third bus 7, the first substation 1 and the The second substation 4 is connected through the first line L1 and the second line L2, the first substation 1 and the third substation 5 are connected through the third line L3, and the second substation 4 and the third substation 5 are connected through the fourth line L4. A station area protection device 3 is arranged in the first substation 1 . Of course, the number of substations in the power system is not limited to 3, and the nu...
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The invention relates to a substation and a transmission line fault protection method and device and detection method and device. The installation proximal end is protected on the opposite side of theline according to the remote fault of the fault line and the opposite side quickly operates at the distance of I section. Then the measured impedance of each sampling period of each line is calculated and then the fault line is judged according to different changes of the measured impedance of the fault line and the non-fault line after the quick operation of the opposite side at the distance section I, and finally the fault is removed. Therefore, the fault protection method can shorten the fault removal time and solve the problem that the remote fault removal time is too long when the line loses the main protection. Moreover, the fault protection method can reliably and accurately identify the fault line and remove the fault according to the measured impedance so as to improve the reliability of fault detection and fault removal.
Description
technical field [0001] The invention relates to a substation and a transmission line fault protection method, device, detection method and device. Background technique [0002] High-voltage transmission lines are generally equipped with longitudinal optical fiber differential protection as the main protection, and three-stage distance protection as the backup protection. The distance section I is set according to the 80% range of the line, and the distance section II requires sensitivity to the end of the line, and cooperates with the distance protection of the lower line through a delay of 0.5s-1s. In actual operation, due to the problem of the longitudinal fiber channel, the double differential protection of the line (that is, the differential protection at both ends of the line) exits. At this time, if the line fails, then the protection and The protection action of distance II section on the far fault side removes the fault. However, based on the action principle of di...
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IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085G01R31/088H02H7/26
Inventor 董新涛倪传坤李宝伟李旭李文正邓茂军游建军姜自强裘愉涛盛海华方愉冬潘武略吴佳毅王东兴胡沙沙都磊郝慧贞唐艳梅赵剑松陈继瑞牛强王松
Owner XUCHANG XJ SOFTWARE TECH