Inter-turn fault discrimination method of energy extraction winding and inter-turn fault protection method and device

Abstract

The invention discloses a turn-to-turn fault distinguishing method of an energy extraction winding. Whether a turn-to-turn fault occurs in the energy extraction winding is distinguished by distinguishing a phase relation between a zero-sequence current of an initial end of a main reactor and a zero-sequence current of the energy extraction winding. The invention also provides a turn-to-turn faultprotection method of the energy extraction winding. The turn-to-turn protection method employs the turn-to-turn fault distinguishing method and comprises the steps of controlling a turn-to-turn protection component of the energy extraction winding to act when the turn-to-turn fault occurs in the energy extraction winding, otherwise shunting the turn-to-turn protection component of the energy extraction winding. The invention also provides a turn-to-turn fault protection device of the energy extraction winding. The turn-to-turn fault protection device comprises a zero-sequence current acquisition module, a phase calculation module, a fault distinguishing module and the turn-to-turn protection component of the energy extraction winding. By the turn-to-turn fault distinguishing method, the turn-to-turn fault protection method and the turn-to-turn fault protection device, the turn-to-turn fault of the energy extraction winding can be sensitively reflected, the misoperation of the turn-to-turn protection component can be prevented, the turn-to-turn fault distinguishing method, the turn-to-turn fault protection method and the turn-to-turn fault protection device are applicable to variousworking conditions, and protection sensitivity and reliability of the energy extraction winding are greatly improved.

Description

technical field [0001] The invention relates to the technical field of pumping reactors, in particular to a method for judging an inter-turn fault of an energy pumping winding, a method and a device for protecting an inter-turn fault. Background technique [0002] At present, the energy-pumping winding of the pumping reactor is mainly used for substation power supply, and its capacity is small, which is hundreds of times different from the capacity of the main reactor. The turn-to-turn protection of the conventional shunt reactor adopts the principle of zero-sequence impedance as the main protection for the turn-to-turn fault of the reactor winding. Insufficient sensitivity leads to protection components refusing to operate or malfunctioning, and in severe cases, pumping reactors cannot work normally, affecting the safe and stable operation of the entire power system. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies i...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for distinguishing inter-turn faults of pumped windings and a method and device for inter-turn fault protection, and solve the detection sensitivity of inter-turn faults of pumped energy windings in the prior art Not high, there are technical problems that the protection components refuse to operate, malfunction, and affect the safe and stable operation of the entire power system

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