Outdoor high-voltage vacuum circuit breaker capable of preventing long-term live-line closing coil

Abstract

The invention relates to an outdoor high-voltage vacuum circuit breaker capable of preventing a long-term live-line closing coil. The outdoor high-voltage vacuum circuit breaker comprises an anti-jumping relay which is connected in series in a power circuit of the closing coil in the outdoor high-voltage vacuum circuit breaker and is used for disconnecting the power circuit when the closing coil is electrified continuously over 3 seconds. By the outdoor high-voltage vacuum circuit breaker capable of preventing the long-term live-line closing coil, the power circuit of the closing coil is disconnected through the anti-jumping relay when the closing coil is electrified continuously over 3 seconds. Therefore, the closing coil can be prevented from being burned out. Meanwhile, a direct current system is protected so as to guarantee motion reliability of a relay protection device.

Description

technical field [0001] The invention relates to an outdoor high-voltage vacuum circuit breaker, in particular to an outdoor high-voltage vacuum circuit breaker capable of preventing a closing coil from being electrified for a long time. Background technique [0002] When the existing outdoor high-voltage vacuum circuit breaker is working, it often occurs that the closing coil burns out during the closing process, resulting in a decrease in the DC voltage. There are many factors that cause the closing coil to burn out. The main reason is that the operating circuit of the circuit breaker is designed for short-term operation. If the closing coil passes a large current for a long time, it will heat up and burn out the closing coil. The discharge of the current causes the voltage to drop. The specific reason is: in the process of closing operation, due to mechanical reasons, the circuit breaker cannot be closed immediately after the closing operation, and the auxiliary contact c...

AI Technical Summary

Problems solved by technology

[0002] When the existing outdoor high-voltage vacuum circuit breaker is working, it often occurs during the closing process that the closing coil burns out and causes the DC voltage to drop.

There are many factors that cause the closing coil to burn out. The main reason is that the operating circuit of the circuit breaker is designed for short-term operation. If the closing coil passes a large current for a long time, it will heat up and burn out the closing coil. voltage drop due to current discharge

The specific reason is: in the process of closing operation, due to mechanical reasons, the circuit breaker cannot be closed immediately after the closing operation, and the auxiliary contact cannot immediately cut off the closing circuit. When the operating handle is in the closing position for a long time , and the fuse cannot be blown, the closing coil will pass a large current for a long time, and the current through the closing coil of the electromagnetic operating mechanism will be very large, up to several hundred amperes, and the closing coil will pass such a large current for a long time, On the one hand, it will burn out the coil, on the other hand, it will seriously reduce the voltage of the DC system or even damage the rectifier equipment, which will seriously affect the reliability of the relay protection device.

Images