Method and device for judging zero-sequence direction of longitudinal connection of high-voltage line
A high-voltage line, zero-sequence direction technology, applied in the fault location, detecting faults by conductor type, etc., to solve the problem of zero-sequence direction protection malfunction
Active Publication Date: 2018-06-01
STATE GRID CORP OF CHINA +2
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[0006] The embodiment of the present invention provides a method for judging the zero-sequence direction of the longitudinal connection of high-voltage lines, which can solve the problems in the prior art by comparing the relative angle difference between the zero-sequence current on both sides of the high-voltage line and the voltage of the same phase in the three-phase voltage. Technical problems existing in judging the phase comparison results of the zero-sequence voltage and zero-sequence current on one side of the high-voltage line
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[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0062] The existing longitudinal zero-sequence directional protection for high-voltage and ultra-high-voltage lines of the power system is used to protect the single-phase high-resistance ground fault of the line. The zero-sequence directional element adopts the phase comparison result of the zero-sequence voltage and the zero-sequence current on one side of the high-voltage line. However, this method is susceptible to insufficient zero-sequence ...
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The invention discloses a high voltage line longitudinal zero sequence direction discrimination method and a device. The high voltage line longitudinal zero sequence direction discrimination method comprises steps of determining a first relative angle difference between zero sequence current on one side of the high voltage line and a phase voltage and determining a second relative angle difference between the zero sequence current on other side of the high voltage line and same phase voltage, wherein if the difference value of a first relative angle difference and a second relative angle difference is in a preset angle difference range, the direction of the longitudinal zero sequence direction is a positive direction, otherwise the longitudinal zero sequence direction is the negative direction. When one phase voltage has PT disconnection, the other phase voltage can be utilized to perform determination in order to avoid the locking zero sequence direction protection problem when the three-phase PT is disconnected. In high resistance fault, the invention avoids the problem that the zero sequence voltage is small and the sensitivity is not enough, which causes the incorrect operation of the zero sequence direction member and solves the problem of the false operation of the zero sequence direction protection caused by the non-faulted line affected by the faulted zero sequence mutual inductance which is related to the weak current and strong magnetic.
Description
Technical field [0001] The invention relates to the technical field of power system relay protection, and in particular to a method and device for judging the longitudinal zero sequence direction of a high-voltage line. Background technique [0002] At present, the longitudinal zero-sequence directional protection of high-voltage lines is mainly used to protect single-phase high-resistance ground faults. The zero-sequence directional element uses the phase comparison result of the zero-sequence voltage and the zero-sequence current on the side of the high-voltage line to determine the direction of the zero-sequence current. When leading the zero sequence voltage direction by 90°, the longitudinal zero sequence direction is considered to be the positive direction, and the longitudinal zero sequence protection can operate. The use of zero sequence directional components for longitudinal zero sequence directional protection has the characteristics of high sensitivity, but there are ...
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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 倪传坤李宝伟靳东晖樊占峰李顺昕聂文海刘丽朱正甲张嵩
Owner STATE GRID CORP OF CHINA