Device and method for zero-crossing split-phase switching control after first cycle wave of double power supply voltage difference

Abstract

The invention relates to a device and a method for zero-crossing split-phase switching control after a first cycle wave of double power supply voltage difference. The device for zero-crossing split-phase switching after the first cycle wave of the double power supply voltage difference comprises a controller and a permanent magnet switch, wherein the controller controls a bus-tie circuit breaker to be connected to a first bus and a second bus, one end of the permanent magnet switch is connected with the first bus, the other end of the permanent magnet switch is connected with the second bus, and a control end of the permanent magnet switch is connected with the controller. When a working power supply is powered off because of a fault, the permanent magnet switch is adopted to control emission of a closing instruction at first zero crossing of double bus split-phase voltage difference, and a standby power supply is inputted just at a zero-crossing moment after the first cycle wave of the voltage difference. The device and the method provided by the invention not only previous complicated calculation for a quick switching criterion and a first synchronization criterion, but also enable whether an action criterion condition is satisfied or not to be not influenced by load characteristics, thereby absolutely ensuring zero-crossing phase-split quick switching after the first cycle wave of the voltage difference, and improving the switching speed of a double power supply system. In addition, an arcing phenomenon brought about in on-off of a traditional mechanical switch does not occur, generation of loop current is suppressed, and the service life of the switch is prolonged.

Description

technical field [0001] The invention relates to a power supply switching device and method, in particular to a zero-crossing phase-separation switching control device and method after the first cycle of the voltage difference between dual power supplies. Background technique [0002] Continuous and reliable power supply is the basic condition for the safe operation of electrical equipment. Therefore, occasions that require high power supply reliability are generally equipped with two power supplies, and the successful and fast switching between the two power supplies is the key to continuous and uninterrupted power supply. Due to external or internal reasons such as lightning strikes, short circuits, low-frequency oscillations, and load circuit failures, large and medium-sized industrial enterprises such as petrochemical, metallurgical, and power plants often experience abnormal power outages, large voltage fluctuations, or short-term power outages (commonly known as "shock p...

AI Technical Summary

Problems solved by technology

When the traditional mechanical switch is turned on or off, contact vibration and arcing will occur, resulting in contact corrosion, electromagnetic interference and power loss. This not only limits its application range, but also makes its electrical life shorter than its mechanical life.

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