High voltage cable-overhead line hybrid line fault phase ranging method

A hybrid line and high-voltage cable technology, applied in the fault location and other directions, can solve the problems of not considering the influence of the zero-mode component coupling of the line, the synchronization of the pulse transmitter device is difficult to achieve, and the fault section cannot be correctly judged, so as to shorten the fault period. Checking time, speeding up power recovery, and small search range

A hybrid line and high-voltage cable technology, applied in the fault location and other directions, can solve the problems of not considering the influence of the zero-mode component coupling of the line, the synchronization of the pulse transmitter device is difficult to achieve, and the fault section cannot be correctly judged, so as to shorten the fault period. Checking time, speeding up power recovery, and small search range

CN101907677AInactive Publication Date: 2010-12-08NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • High voltage cable-overhead line hybrid line fault phase ranging method
  • High voltage cable-overhead line hybrid line fault phase ranging method
  • High voltage cable-overhead line hybrid line fault phase ranging method

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Embodiment 1

[0046] Such as figure 1 The type B hybrid line shown is taken as an example for analysis and simulation, specifically as a simple double-ended system. When a fault occurs at any point on the line, the faulty network is decomposed into positive, negative, and zero-sequence networks by using the symmetrical component method ; For three-phase symmetry faults or three-phase asymmetry faults, there is a positive-sequence network. Therefore, in the present invention, positive-sequence voltage and positive-sequence current are used for hybrid line fault distance measurement.

[0047] Assuming that a fault occurs on a Type B hybrid line, the location of the fault point has three forms: overhead line section I, intermediate cable line, and overhead line section II.

[0048] 1. The location function and its phase characteristics at any point on the hybrid line when the I section of the overhead line is faulty

[0049] figure 2 It is the positive-sequence network diagram of the hybrid...

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Abstract

The invention discloses a method for realizing high voltage cable-overhead line hybrid line fault ranging by using the phase characteristic of a positioning function, which belongs to the technical field of relay protection of power systems. The method comprises: firstly, acquiring positive sequence electrical data at two ends of a failed hybrid line system and equaling the entire hybrid line to a line of the same length; secondly, deducing the positioning function by using the positive electrical data at the two ends of the hybrid line system, and determining a minimum fault partition having a fault point according to the size of the phase of the positioning function; and finally, accurately finding the fault range of the hybrid line in the fault partition by using the size of the phase angle of the positioning function. The method can accurately find the position of a fault, reduce troubleshooting time and accelerate power supply restoration and has a great significance for the safe and economic operation of the power system.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for realizing fault distance measurement of a high-voltage cable-overhead line hybrid line by using the phase characteristic of a positioning function. Background technique [0002] With the rapid development of large and medium-sized cities in my country and the requirements of urban planning, power cables have been widely used due to their advantages of small footprint, personal safety, high power supply reliability, and small maintenance workload. On the basis of overhead lines, cable-overhead hybrid lines are developed and applied more and more widely, such as Shanghai Xiaoyangshan cable-overhead hybrid line, railway self-closing through cable-overhead line and electrified railway cable-overhead hybrid line. After the high-voltage cable-overhead line hybrid line fails, it can accurately measure the distance, which can shorten the trouble...

Claims

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Application Information

Patent Timeline
08 Dec 2010
Publication
CN101907677A
IPC
G01R31/08
Inventors
马静; 王增平