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Distance measurement method for line phase-to-phase fault distance protection

A phase-to-phase fault and distance protection technology, applied in the direction of fault location, etc., can solve the problem of low calculation accuracy of fault distance

Active Publication Date: 2011-07-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

[0004] Aiming at the disadvantages of low fault distance calculation accuracy when the distance protection described in the above background technology is affected by the load current and transition resistance when a fault occurs between phases, the present invention proposes a distance measurement method for line fault distance protection

Method used

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  • Distance measurement method for line phase-to-phase fault distance protection
  • Distance measurement method for line phase-to-phase fault distance protection
  • Distance measurement method for line phase-to-phase fault distance protection

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Embodiment Construction

[0028] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0029] figure 1 It is a schematic diagram of a line-phase fault distance protection device applying the method of the present invention, and the specific embodiments are as follows:

[0030] like figure 2 As shown, the schematic diagram of the ultra-high voltage double-terminal power transmission system applying the method of the present invention is a 500 kV ultra-high voltage double-terminal power supply system.

[0031] Among them: the bus bars on both sides are m and n respectively, the section I of the transmission line is 200 kilometers long, and the section II of the transmission line is 100 kilometers long. The protection is installed at the m end of section I of the transmission line. The phase angle diff...

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Abstract

The invention discloses a distance measurement method for line phase-to-phase fault distance protection, belonging to the technical field of the relay protection of a power system. The distance measurement method comprises the following steps: calculating distance from a relay location to a phase-to-phase fault point by calculating the vector difference between the fault phase-to-phase voltage measured on the relay location and the fault phase-to-phase voltage of a phase-to-phase fault point. The method disclosed by the invention is not affected by load current and transition resistance and has the advantages of high measurement precision and practical value.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a distance measuring method for fault distance protection between line phases. Background technique [0002] As a relay protection that acts on tripping, it must meet four requirements technically: reliability, selectivity, quick action and sensitivity. Reliability is the most fundamental requirement for relay protection performance. Reliability includes safety and reliability. Safety requires that the relay protection brakes reliably when it does not need to operate, that is, no malfunction occurs; reliability requires that the relay protection should operate within the specified protection range. When the action is reliable, that is, no rejection action occurs. The above four basic requirements are the basis for evaluating and researching relay protection. Whether it is refusal to operate or malfunction, it will cause serious harm to ...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 马静曾惠敏林富洪王彤王增平康晓娟黄海吴善班李生坤岳军郑志煜陈灵蔡建煌林力辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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