An energy-saving emergency power switching system and method

Abstract

The invention discloses an energy-saving emergency power supply switching system and method, comprising a switching unit controller, and a phase A switching unit, a B phase switching unit and a C phase switching unit respectively connected to the switching unit controller; each phase switching unit It includes: a first transfer switch assembly connected to the output end of the corresponding phase of the mains, and a second transfer switch assembly connected to the output end of the corresponding phase of the emergency power inverter; the first transfer switch assembly includes: A commercial power thyristor and a commercial power contactor; the second transfer switch assembly includes: an inverter thyristor and an inverter contactor connected in parallel. In the emergency power switch, the present invention adopts the combination of the relay / contactor that works for a long time and the silicon controlled rectifier that works for a short time, and can meet the requirement of the load for switching time ≤ 3 ms through timing control, and at the same time reduce the cost of the device , Improve reliability, reduce loss and save power.

Description

technical field [0001] The invention relates to the technical field of reliable switching of emergency power sources, in particular to an energy-saving emergency power switching system and method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] As a device that provides backup power for important loads such as fire-fighting lamps and equipment, chemical equipment, smelting equipment, elevators, etc., emergency power supply has been widely used in recent years. Compared with the earlier ordinary lamps and fire fighting equipment, new applications have created new demands. Loads such as some chemical equipment and metal halide lamps have extremely strict requirements on switching time. According to some of our research, it is necessary to achieve a switching time of ≤3ms to ensure the normal operation of subsequent equipment or avoid major...

AI Technical Summary

Problems solved by technology

[0005] (1) Relays / contactors are used to switch the cold standby mode of the inverter, and the switching time can meet the national standard of 0.25s; this method has high reliability and low cost; but it cannot meet the requirement of emergency power switching time ≤ 3ms

[0006] (2) The dedicated STS (static transfer switch) method can achieve a switching time of ≤3ms; this method has a fast switching time, but the cost is high cost and low reliability. Compared with the relay / contactor method, the loss is large ( The voltage drop of the thyristor is generally 1.5V. Taking 300A as an example, the loss of the thyristor alone is as high as 1.5*300*3=1350W, while the loss of the relay / contactor is only 50*3=150W)

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