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A turn-to-turn fault protection method of a high-voltage shunt reactor

An inter-turn fault and reactor technology, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc., can solve the problem of low sensitivity, and achieve the effect of improving reliability and protection sensitivity.

Active Publication Date: 2018-12-18
XUJI GRP +2
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Problems solved by technology

[0004] The invention provides a high-voltage shunt reactor turn-to-turn fault protection method to solve the problem of low sensitivity of the existing shunt reactor turn-to-turn fault protection method

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  • A turn-to-turn fault protection method of a high-voltage shunt reactor
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  • A turn-to-turn fault protection method of a high-voltage shunt reactor

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Embodiment Construction

[0018] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The turn-to-turn fault protection method of the high-voltage shunt reactor of the present invention is mainly applied in the relay protection device of the smart grid, and the protection method is integrated in the relay protection device as an independent functional module. Wiring diagram as figure 1 As shown, the protection method is specifically as follows: After the protection is started, the protection action is judged. When the protection action judgment condition is satisfied, it is judged whether the current at the head end of the reactor is greater than the high fixed value threshold value. If it is greater than, the inter-turn fault protection operates instantaneously , otherwise, the turn-to-turn fault protection delay action. This protection method first recognizes the fault through protection action identificatio...

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Abstract

The invention relates to a turn-to-turn fault protection method of a high voltage shunt reactor. The method comprises the following steps: judging the start of protection; judging the operation of protection after the start of protection; judging whether the current at the head end of reactor is greater than the threshold value of a high fixed value when the judging condition of protection operation is satisfied; if the current is greater than the threshold value, performing instantaneous operation of turn-to-turn fault protection; otherwise, delaying operation of turn-to-turn fault protection. The invention identifies the serious fault and the weak fault in the region by the magnitude of the head-end current, ensures the quick operation of the turn-to-turn protection when the serious fault occurs in the region, improves the protection sensitivity of the reactor when the turn-to-turn short circuit and the single-phase ground fault occur, and further improves the reliability of the protection device.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to an inter-turn fault protection method for a high-voltage shunt reactor used in a smart grid. Background technique [0002] Most high-voltage shunt reactors adopt a split-phase structure, and the main fault form of the reactor is inter-turn short circuit or single-phase grounding. However, when the number of short-circuited turns is small, the three-phase current imbalance caused by the inter-turn short-circuit of one phase may be very small, and it is difficult to be detected by the protection device; since the differential protection does not respond to the inter-turn short-circuit fault in principle, it is required The turn-to-turn protection can sensitively reflect the turn-to-turn short circuit and single-phase ground fault of the reactor. [0003] There are many existing inter-turn fault protection methods for shunt reactors. For e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00H02H1/00
CPCH02H1/0007H02H7/00
Inventor 邓茂军倪传坤樊占峰李宝伟马和科李旭陈继瑞吕利娟席颖颖
Owner XUJI GRP
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