Power distribution automatic terminal and method for improving reliability of breaker

Abstract

The invention discloses a power distribution automatic terminal and a method for improving reliability of a breaker. The power distribution automatic terminal comprises a switching abnormality monitoring interface, software and a controllable switching operation power supply module, wherein the monitoring interface and the software are arranged in a distribution network automatic terminal. A control chip of the power supply module has the working capability of turning off a PWM switching power supply. A control pin of the control chip is controlled by the distribution network automatic terminal so as to stop or recover energizing of an operation circuit of the breaker. The protection method is characterized in that a measuring and controlling module of the power distribution automatic terminal monitors the breaker; when a breaker control coil which does not finish a control action for a long time is energized, the measuring and controlling module emits a control signal to the power supply module; the power supply module stops an operational power supply of the breaker from working after receiving the signal emitted by the measuring and controlling module. As the operation power supply is automatically cut off when the control circuit of the breaker is abnormal and external actions are not needed, the phenomenon that the breaker control coil is energized for a long time and is prone to burn and damage is avoided and maintaining loads are reduced.

Description

technical field [0001] The invention relates to a power distribution automation terminal and a method for improving the reliability of a circuit breaker, belonging to the field of power transmission and transformation. Background technique [0002] Circuit breakers are widely used in distribution networks and are the most important control and protection appliances in power systems. In actual use, the closing and opening coils of circuit breakers are prone to burn out due to long-term energization due to auxiliary contacts and mechanical problems. For example, the looseness of the opening / closing coil causes the displacement of the electromagnet core when the circuit breaker is opened, which will cause the iron core to jam, or the movable stroke of the iron core is too small. When the operating power is turned on, the iron core does not move against the tripping mechanism and The opening coil is energized for a long time and burned. For the closing coil, when the closing c...

AI Technical Summary

Problems solved by technology

When an accident occurs to electrical equipment, if the circuit breaker refuses to operate due to the disconnection of the circuit breaker opening circuit, the accident will be expanded, resulting in a large-scale power outage caused by leapfrog opening, and even serious consequences such as burning of electrical equipment and fire.

When the integrity of the closing circuit is damaged, although the damage caused is smaller than that of the breaking circuit, it also makes the line unable to transmit power normally and hinders the improvement of power supply reliability.

However, outdoor circuit breakers are often installed in relatively remote fields, and it is difficult to repair them.

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