Hollow transformer parameter-based turn-to-turn zero differential protection method of energy pumping reactor

Abstract

The invention discloses a hollow transformer parameter-based turn-to-turn zero differential protection method of an energy pumping reactor in the technical field of energy pumping reactor protection,and aims to solve the technical problems of low turn-to-turn fault detection sensitivity of an energy pumping winding of the energy pumping reactor in the prior art and rejected operation and maloperation of a protection component. The hollow transformer parameter-based turn-to-turn zero differential protection method comprises the steps of acquiring a zero-sequence current of an initial end of amain reactor and a zero-sequence current of the energy pumping winding; calculating the zero-sequence differential current and a zero-sequence braking current, wherein zero-sequence differential current calculation is in a way that the zero-sequence current of the initial end of the main reactor is converted to an energy pumping winding side according to a primary current conversion coefficient ofa hollow transformer parameter model; setting an action condition and a shunting condition of a zero-sequence differential component, and judging that an internal turn-to-turn fault occurs when the action condition is met and no shunting condition is generated. By the hollow transformer parameter-based turn-to-turn zero differential protection method, the turn-to-turn fault of the main reactor winding and the energy pumping winding can be sensitively reflected, the maloperation of the zero differential protection component can be effectively prevented, the hollow transformer parameter-based turn-to-turn zero differential protection method is applicable to various working conditions, the protection sensitivity and reliability of the energy pumping winding is greatly improved, meanwhile, nodelay is generated on the zero differential protection component, and the action speed is rapid.

Description

technical field [0001] The invention belongs to the technical field of pumping reactor protection, and in particular relates to a homogeneity protection method between turns of a pumping reactor based on parameters of an air-core transformer. 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. [0003] At present, there are two methods for protection against inter-turn faults of pumping wind...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a homodyne protection method between turns of a pumped reactor based on the parameters of an air-core transformer, so as to solve the problem of low detection sensitivity of the turn-to-turn fault of the pumped winding of a pumped reactor in the prior art and the existence of protective components that refuse to operate. , Misoperation technical problems

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