Main and backup power shifting device for secondary transformer

Abstract

The invention discloses a main and backup power shifting device for a secondary transformer. The device comprises a resistor R1, a comparator A1, a comparator A2, a diode D2, a variable resistor R6, an NE555 time base integrated circuit, a rectification filtering circuit, a time-delay circuit and a power source. One end of the resistor R1 is connected with the inverted input end of the comparator A1, the non-inverting input end of the comparator A1 is grounded, the resistor R2 is connected between the inverted input end of the comparator A1 and the output end, and the comparator A1 is connected with an inverted amplifier. The rectification filtering circuit comprises the diode D1 and an electrolytic capacitor C1; the time-delay circuit comprises a resistor R5 and an electrolytic capacitor C2. A first pin of the NE555 time base integrated circuit is grounded, and a second pin of the NE555 time base integrated circuit is connected with a sixth pin, the joint of a negative electrode of the diode D2 and the NE555 time base integrated circuit is located on a circuit between the second pin and the sixth pin of the NE555 time base integrated circuit. The main and backup power shifting device is used for obtaining main power output signals when applied, and trigger signals are generated when a main power source outputs outage signals to control use of a backup power source.

Description

technical field [0001] The invention relates to an electrified railway traction substation, in particular to a main backup power switching device for a secondary transformer. Background technique [0002] Electrified railway traction substations undertake the important task of providing uninterrupted power supply for electric locomotives, and are in a very important position in the safe transportation and production of railways. Therefore, traction substations are required to have dual power sources and dual main transformers for fixed backup. Today, the switching of the main and standby power sources is done manually. The operation process is cumbersome, time-consuming and labor-intensive, and often affects the normal use of the traction substation due to untimely operation. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provides a main backup power switching device for a secondary transformer...

AI Technical Summary

Problems solved by technology

Today, the switching of the main and standby power sources is done manually. The operation process is cumbersome, time-consuming and laborious, and often affects the normal use of the traction substation due to untimely operation.

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