Three-phase AC Voltage Stabilizer for Rail Transit

Abstract

The invention relates to a three-phase alternating current voltage stabilizer device for rail transit, which comprises a self-coupling compensation type three-phase main circuit unit, a compensation control unit, a trigger unit and a protection driving unit; the compensation control unit consists of three compensation control circuits which comprise an analog-to-digital conversion coding circuit,a decoding gating circuit, a delay protection circuit, a trigger gating control circuit and an error detection judging circuit respectively and are used for sampling the voltage of a three-phase alternating current power supply and outputting a corresponding three-phase trigger control signal, a three-phase non-trigger area control signal and a three-phase trigger gating control value judgment signal; and the protection driving unit judges whether the signal is effective or not according to the input three-phase trigger gating control value to protect the three-phase thyristor switch group inthe main circuit. While the voltage stabilizer achieves interlocking control, the thyristor switch group is protected through whether a logic error occurs in the control circuit or not, so that the protection force aiming at the abnormal working process of the voltage stabilizer is effectively strengthened, and the work is more stable and reliable.

Description

Technical field [0001] The invention relates to the technical field of power supplies, in particular to a rail transit three-phase AC voltage stabilizing device. Background technique [0002] The existing compensating single-phase and three-phase AC voltage stabilizers have the advantages of wide voltage stabilization range, almost no waveform distortion, high overall efficiency, and strong load adaptability. The principle is to automatically control the switching of different winding coils of the primary winding on the compensation transformer according to the level of the input voltage, using the ratio of the primary side working winding and the secondary winding, or by adjusting the voltage applied to the primary winding , Provide two-way multi-gear voltage compensation, so as to achieve the purpose of voltage regulation and stabilization. [0003] The AC power supply for the subway control center, railway signal indicator and other rail transit occasions or equipment must be r...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the existing AC voltage stabilizing device for rail transit, the present invention provides a three-phase AC voltage stabilizing device for rail transit, which includes an auto-compensated three-phase main circuit unit, a compensation control unit, a trigger unit, a protection Drive unit

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