Control power selection method of automatic transfer switch and automatic transfer switch

Abstract

The invention discloses a control power selection method for an automatic change-over switch. The method gives full consideration to the on / off states of the normally used and standby side execution switches and the working state of a driving mechanism during the selection of a control power supply, so as to avoid the loaded switching of a control power selection switch, builds a selection logic of the control power supply through combining with the switching states of the normally used and standby side execution switches, so as to avoid the unnecessary operations, caused by the voltage fluctuation, of the control power selection switch, and prolong the service life. The invention also discloses the automatic change-over switch. Compared with the prior art, the method can effectively avoidthe loaded switching of the control power selection switch, builds the selection logic of the control power supply through combining with the switching states of the execution switches, can avoid theunnecessary operations, caused by the voltage fluctuation, of the control power selection switch, and effectively prolongs the service life.

Description

technical field [0001] The invention relates to an automatic transfer switch, in particular to a method for selecting a control power source of the automatic transfer switch. Background technique [0002] The control power supply of the automatic transfer switch (referring to the control power supply of the driving mechanism used to drive the common side executive switch and the standby side executive switch to realize the automatic power conversion in the automatic transfer switch) generally directly adopts the autonomous circuit power supply, that is, the common power supply or the standby power supply . At a certain moment, when one of the power sources cannot meet the control requirements of the drive mechanism, the automatic transfer switch control unit will select another power source that can meet the control requirements of the drive mechanism as the control power supply. If required, the control power supply remains the same as the original selection. Therefore, i...

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Problems solved by technology

For example, when the common power supply is abnormal and the backup power supply is normal, the control unit will switch the control power supply to the backup power supply, and then control the drive mechanism to realize the conversion action, switch to the backup power supply to supply power to the load, and the drive mechanism is switching to the backup power supply. During the process, since the drive mechanism is in working condition, there is a large current in the working circuit of the control power selection switch (usually a relay). Power supply, at this time, load switching will occur, which means that the contact of the control power selection switch is in the state of current to complete the switching of the control power supply, and the load switching may cause arcing of the contacts of the control power selection switch , ablation, greatly reducing the service life of the contacts, and even causing damage to the control power selection switch

[0004] (2) The action of the driving mechanism on the automatic transfer switch generally needs to meet certain voltage conditions and conversion delay conditions, but figure 1 The control power selection method shown only depends on the voltage condition, which will lead to many unnecessary moments (when the drive mechanism is not required to act), the control power selection switch will still only act according to the voltage state, for example, during the transition delay Within the time range, if the originally selected control power supply voltage fluctuates frequently, it may cause frequent actions of the control power selection switch and reduce the service life of the control power selection switch contacts.

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