Automatic change-over switch control method

Abstract

The invention, which belongs to a low-voltage electrical technology field, discloses an automatic change-over switch control method. In the method of the invention, auxiliary contacts of common and stand-by power supply execution switches are used to monitor actual off / on states of the common and stand-by power supply execution switches. During a conversion process and under a fault-free condition, the common power supply execution switch and the stand-by power supply execution switch should be in a double off state. If the common or the stand-by power supply execution switch are not disconnected, the common or the stand-by power supply execution switch has faults. At this time, a controller is used to make a driving device stop working so as to prevent a short circuit between the common power supply and the stand-by power supply. By using the control method of the invention, a short circuit problem of the two power supplies caused by the faults can be effectively avoided, wherein the faults comprise that: the automatic change-over switch appears a broken handle; the contact is adhesive and the like.

Description

technical field [0001] The invention relates to a control method for an automatic transfer switch, which belongs to the low-voltage electrical technology. Background technique [0002] The automatic transfer switch is mainly used in important power supply places. When there is a problem with one power supply and cannot continue to supply power to the load equipment, it is switched to another power supply to ensure the normal operation of the load equipment. In the switching process of the automatic transfer switch, in order to prevent the short circuit of the two power sources caused by the misoperation of the executive switch, at present, some automatic transfer switches only have a mechanical interlock device. When the mechanical interlock device fails, the automatic transfer switch cannot disconnect the executive switch through the handle of the executive switch. If one power supply is switched to the other at this time, the two power supplies will be short-circuited, res...

AI Technical Summary

Problems solved by technology

In the switching process of the automatic transfer switch, in order to prevent the short circuit of the two power sources caused by the misoperation of the executive switch, at present, some automatic transfer switches only have a mechanical interlock device. When the mechanical interlock device fails, the automatic transfer switch cannot disconnect the executive switch through the handle of the executive switch. If one power supply is switched to the other at this time, the two power supplies will be short-circuited, resulting in a major accident

In view of this, the existing automatic transfer switch adds an electrical interlock on the basis of the mechanical interlock, but this electrical interlock is problematic, and it can only ensure that the automatic transfer switch does not close the two power sources at the same time during normal operation. , when there is a problem with the automatic transfer switch itself, such as when the handle of the executive switch is broken or the contact of the executive switch is stuck, the automatic transfer switch cannot disconnect the executive switch through the handle of the executive switch. If there is no power supply, the two power supplies will still be short-circuited, resulting in major accidents and economic losses.

Also, the same problem occurs when the contacts of the actuating switch stick

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