Controllable silicon gate trigger pulse control method of phase-controlled arc suppression coil and trigger board

Abstract

The invention relates to a silicon controlled rectifier gate trigger pulse control method of a phase-controlled arc suppression coil and a trigger board. The positive electrode of the arc suppression coil is connected with the negative electrode of a first silicon controlled rectifier, and the negative electrode of the arc suppression coil is connected with the positive electrode of the first silicon controlled rectifier; the second silicon controlled rectifier is reversely connected with the first silicon controlled rectifier in parallel; the zero-crossing moment of the zero-sequence voltage of the neutral point is detected, and the moment T1 when the current zero-sequence voltage is changed from positive to negative and the moment T2 when the zero-sequence voltage is changed from negative to positive are detected; when the received trigger command is trigger and the trigger time is T, a trigger pulse of a first silicon controlled rectifier is sent at the T1 + T moment of each period, and a trigger pulse of a second silicon controlled rectifier is sent at the T2 + T moment of each period; and when the trigger command is a non-trigger command or a non-trigger command, the trigger pulse is not output. According to the method, accurate compensation of the phase-controlled arc suppression coil to the system can be realized.

Description

technical field [0001] The invention relates to the technical field, in particular to a thyristor gate trigger pulse control method of a phase-controlled arc suppression coil and a trigger board. Background technique [0002] The complete set of phase-controlled automatic tracking and compensation arc-suppression coils is a newly developed arc-suppression product in recent years, including grounding transformers (which can carry loads and provide artificial neutral points for the system), phase-controlled arc-suppression coils (connected to the between neutral point and ground), small resistance (put between the system neutral point and ground after the arc suppression coil compensation exceeds the set time), vacuum contactor or vacuum switch (switching small resistance), trigger board ( Control the behavior of arc suppressing coil and small resistor), zero-sequence current transformer (monitor the current of small resistor and arc suppressing coil), voltage transformer (mon...

AI Technical Summary

Problems solved by technology

How the trigger board can accurately and reliably output the SCR gate trigger pulse is related to the accuracy of the current output by the phase-controlled arc suppression coil. Once there is a mistake, it is easy to generate resonance overvoltage, resulting in damage to the voltage transformer

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