Method for judging inter-turn short-circuit fault of reactor

A technology of inter-turn short-circuit faults and reactors, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables, etc., can solve problems such as difficult rapid and accurate judgments, and difficult detection of characteristic variables, and achieves simple methods and real-time monitoring of internal operations situation, the effect of avoiding fire and burning

Pending Publication Date: 2016-06-22
ZHUHAI LANRUIMENG ELECTRIC
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This is because the characteristic variables used for the setting value are not

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  • Method for judging inter-turn short-circuit fault of reactor
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] The average ampere-turn method is often used when calculating the inductance of air-core reactors in engineering. figure 1 It is a schematic diagram of a single-phase model with a turn-to-turn fault simplified by the average ampere-turns method. Among them: L2 is the faulty turn short-circuited by the metal, L1 is the upper part of the reactor faulty turn, L3 is the lower part of the reactor faulty turn, and U is the terminal voltage of the reactor.

[0031...

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Abstract

The present invention provides a method for judging the inter-turn short-circuit fault of a reactor. According to the method, the inter-turn short-circuit fault of a reactor is judged through detecting the variation of the equivalent resistance of the hollow reactor in the online manner. According to the technical scheme of the invention, the method is simple and high in sensitivity. Particularly, a protection means is additionally provided for operating reactors on the site, so that the operation is simple and feasible. The operating conditions inside reactors can be monitored in real time.

Description

technical field [0001] The invention relates to the field of microcomputer protection of power systems, in particular to a method for judging interturn short-circuit faults of reactors. Background technique [0002] Reactor is an indispensable power equipment in the power system. It is widely used in reactive power compensation devices to limit the impact current or fault current and compensate the capacitive current of the line. With the rapid development of my country's power grid construction, the application of high-voltage air-core reactors is becoming more and more common. [0003] It only takes a few seconds to a dozen seconds for the reactor to burn out from the initial fault stage. If the reactor cannot be removed in time during the fault development stage, it will seriously threaten the safe operation of the power grid and easily lead to major safety accidents. [0004] Turn-to-turn faults in air-core reactors cause changes in characteristic quantities such as ind...

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Application Information

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IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 贾跟卯骆福权闫晓斌贺腾飞
Owner ZHUHAI LANRUIMENG ELECTRIC
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