Common Faults and Cause Analysis of Intelligent Circuit Breakers

The traditional circuit breaker response mainly relies on some physical actions in the mechanical system, which will lead to too many components in the system, resulting in the problem of too large volume. In addition, the circuit breaker relies on the movement of physical machinery to achieve operation. Each link is very complicated, and the time and cost required are relatively high.

Due to technical factors, the accuracy cannot reach a high level, which makes integration difficult and leads to poor overall results. . The advent of electronic and photoelectric transformers has accelerated the process of circuit breaker intelligence, and the traditional technology of control and protection relying on electromagnetic technology has gradually faded out of the market, and substation automation technology has developed from a secondary system to a system.

With the continuous development of technology, technical researchers combine computer technology with circuit-breaking instruments in the fields of detection and protection functions, so that the technology continues to develop and realize the integrated development of automation technology and power supply technology.

Common faults of circuit breakers

By observing the data of the research and investigation of circuit breaker failures by the International Research Council, it can be seen that the failures of circuit breakers in industrial production and electrical applications are as high as 78%. Refusal to operate, about 20% or so are misoperations, accounting for less than 10% of overload faults. The following are the symptoms and causes of their failures based on the analysis of the survey data.

Refuse to close

The iron core is not activated. The possible reasons are: when the circuit has voltage, the coil is burned or broken or the iron core is stuck; when the circuit has no voltage, the fuse is blown, or the contact of the auxiliary switch is poor, or the contact of the secondary circuit is poor; Lever is not activated. The possible reasons are: the movement process is blocked, the closing lock is buckled into the drawbar too deeply, the voltage of the coil terminal is low, the iron core striker causes deformation; the operating mechanism is not released.

The possible reasons are: the main body or the operating mechanism is stuck, the lever is twisted and deformed, and the drawbar is not out of the "dead zone".

Refuse to open

The iron core is not activated. The possible reasons are: when the coil terminal is under voltage, the iron core is stuck, the coil is burnt or part of the wire is broken. When the coil terminal is not under voltage, the fuse is blown or the secondary circuit is in poor contact; the mechanism connecting plate system does not act.

The possible reasons are: the main body or some institutions are seriously stuck.

Wrong closing

The important influencing factor of the power system in the circuit breaker is the malfunction of the circuit breaker, which leads to automatic closing, then opening, and automatic closing after energy storage. The abnormal performance and possibility analysis are as follows: The coil is closed after the energy storage. The possible reasons are: the deformation of the return spring causes the four-link to reset, the force of the closing four-link is too small, the support connection of the lock bracket is loose, the motor power supply is not connected in time, and the switch can be automatically opened without the opening signal.

The possible reasons are: the action voltage of the opening coil is too low, the relay contacts are always closed, the secondary circuit is grounded, and it is closed again after opening. The possible reasons are: the opening buckle and the operating mechanism are not reset, the surface of the lock hook is seriously deformed, causing the lock to be unstable, and the operating mechanism is too large after reset.

Conclusion

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