High-voltage shunt reactor protecting method between turns

Abstract

The invention is a turn-to-turn protecting method of high voltage parallel reactor, composed of self-adapting compensatory zero sequence power direction component, zero sequence impedance locking component, failure open component, harmonic locking component and turn-to-turn short-circuit protective starting component with phase current industrial frequency variation quantity brake and floating threshold: (1) adopting the turn-to-turn short-circuit protective starting component using phase current industrial frequency variation quantity brake and floating threshold technique; (2) when short circuit between turns occurs, for the self-adapting compensatory zero sequence power direction component, its zero sequence source is inside the reactor and zero sequence voltage is very small, in order to enhance sensitivity of short-circuit protection between turns, it compensates the zero sequence voltage; (3) the failure open component; (4) the harmonic locking component utilizes the proportional relation between industrial frequency components and other harmonics in current and voltage, and when the proportion exceeds to a certain extent, increases action delay time of short circuit between turns and reduces acting sensitivity of short-circuit protection between turns.

Description

1. Technical field [0001] The invention relates to a method for inter-turn protection of a high-voltage shunt reactor, in particular to a new method for inter-turn protection of a high-voltage shunt reactor which combines self-adaptive compensation, braking of phase current power frequency variation, and a floating threshold. 2. Background technology [0002] At present, there are zero-sequence current protection, zero-sequence current direction protection, zero-sequence power direction protection with fixed impedance compensation and zero-sequence impedance protection for inter-turn protection of high-voltage shunt reactors, but there are low sensitivity and slow action speed. Problems with high error rates: [0003] 1. Zero-sequence current protection as high-voltage shunt reactor inter-turn protection [0004] —The zero-sequence current protection is set to avoid the zero-sequence current that occurs in normal operation, and the protection band acts on tripping within a ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are zero-sequence current protection, zero-sequence current direction protection, zero-sequence power direction protection with fixed impedance compensation and zero-sequence impedance protection for inter-turn protection of high-voltage shunt reactors, but there are low sensitivity and slow action speed. Problems with high error rates:

In addition, when the impedance relay and the directional relay have LC resonance in the line, it can also cause the impedance relay to transiently override or cause the directional relay to lose its directionality.

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