Self-inspection system and self-inspection method with dual optocouplers for relay outlet circuit

Abstract

The invention discloses a dual optocoupler self-inspection system and a self-inspection method for a relay outlet circuit. Once the components in the relay outlet circuit are damaged, resulting in circuit breakdown or disconnection, it will cause the circuit breaker to exit by mistake or refuse to operate, causing serious harm to the power system. The technical scheme adopted in the present invention is: each outlet circuit of the relay includes a separate startup circuit and action circuit; the outlet circuit of the relay is driven by the joint conduction of the startup circuit and the action circuit; One feedback optocoupler, using two feedback optocouplers to monitor the state of the starting circuit and the action circuit in real time, detect the short circuit and open circuit abnormality of the outlet circuit in real time, avoid the wrong exit of the relay caused by self-test, and improve the reliability of the relay.

Description

technical field [0001] The invention belongs to the field of intelligent circuit breaker control, in particular to a self-inspection system and a self-inspection method for a relay outlet circuit with double optocouplers. Background technique [0002] In the current intelligent substation, the intelligence of the primary equipment is not yet mature, and the intelligent circuit breaker control unit is used to realize the control of the circuit breaker. The intelligent circuit breaker control unit is connected to secondary equipment such as protection and measurement and control through optical fiber on the upper side, and receives the opening and closing commands issued, and sends the control commands to the circuit breaker operating mechanism through the outlet circuit on the lower side to realize the opening and closing of the circuit breaker gate operation. Therefore, once the devices in the outlet circuit are damaged, resulting in circuit breakdown or disconnection, it w...

AI Technical Summary

Problems solved by technology

Therefore, once the components in the outlet circuit are damaged, resulting in circuit breakdown or disconnection, it will cause the circuit breaker to exit by mistake or refuse to operate, causing serious harm to the power system.

[0003] The existing export circuit design, one is the export circuit without self-test design, when the circuit is short-circuited or open-circuited, the device cannot give an alarm, and it is prone to malfunction or refusal to operate; the other is to use another pair of contacts of the relay. The disadvantage of this method is that once the contact point of the recovery is stuck or damaged, it will cause false alarms, and the open circuit detection can only be judged when the relay is activated.

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