Reclosing circuit for controlling and protecting on-off controller

Abstract

The invention discloses a reclosing circuit for controlling and protecting an on-off controller. The reclosing circuit comprises a single chip microcomputer, a bipolar transistor, a diode, a relay and a pull-in coil used for controlling and protecting the on-off controller, the single chip microcomputer is connected with a base electrode of the bipolar transistor, an emitting electrode of the bipolar transistor is grounded, a nodal joint formed by connecting a collector electrode of the bipolar transistor and one end of the diode is connected with one end of the relay, a nodal joint formed by connecting the other end of the diode and the other end of the relay is connected with an internal power supply, one end of the pull-in coil is connected with a null line of an alternating current power supply through a contact point of the relay, and the other end of the pull-in coil is connected with a live wire of the alternating current power supply. According to the reclosing circuit for controlling and protecting the on-off controller, the single chip microcomputer controls on and off of the relay through the bipolar transistor, the power on and off controlling over the pull-in coil by the alternating current power supply is completed, and switching on and off of the on-off controller can be controlled and protected.

Description

technical field [0001] The invention relates to the field of control and protection switch controllers, in particular to a reclosing circuit for control and protection switch controllers. Background technique [0002] The control and protection switch controller has the function of remote automatic control and local manpower control to control and operate, has coordinated and coordinated time-current protection characteristics, and has the function of automatic cooperation between control and protection, and continuous operation after short circuit. It can realize the control and protection of motor load and power distribution load. However, traditional control and protection switch controllers only have basic control functions such as overload long-time delay, short-circuit short-time delay, short-circuit instantaneous, undercurrent, three-phase unbalance, overvoltage and undervoltage protection, etc. These protection and control functions have certain Limitation, when the...

AI Technical Summary

Problems solved by technology

However, traditional control and protection switch controllers only have basic control functions such as overload long-time delay, short-circuit short-time delay, short-circuit instantaneous, undercurrent, three-phase unbalance, overvoltage and undervoltage protection, etc. These protection and control functions have certain Limitation, when there is a leakage or voltage fault to disconnect the circuit, even after the fault is eliminated, personnel are required to close the switch on site, and it cannot be restored to use in time

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