How Smart Circuit Breakers Work

With the development of the national economy and the continuous advancement of technology, both industrial production and daily life have put forward higher and higher requirements for the power supply quality of the power system: to be able to achieve uninterrupted power supply, even if the power is cut off, the power-off time must be required. As short as possible, the outage scope is as small as possible. This requires the power supply system to have a relatively high degree of automation and intelligence. When some faults occur in the power system, the intelligent protection equipment in the system can identify the type of fault in time, quickly remove the faulty part of the system, and prevent the fault from further expanding, so that the entire system can operate normally.

The intelligent circuit breaker mechanism is located on the front of the circuit breaker. The mechanism adopts a five-link free release mechanism and is designed in the form of energy storage. During the use of the intelligent circuit breaker, the mechanism is always in the pre-energy storage position. As soon as the circuit breaker receives the closing command, the circuit breaker can be closed instantly. Below we bring you a key analysis of the working principle of smart circuit breakers.

Analysis of the working principle of the intelligent circuit breaker--working mode

The basic working mode of the intelligent circuit breaker is: when the system fails, the relay protection device sends a disconnection signal or the operator sends an operation signal, and the intelligent identification module is first started to judge the current state, that is, the working condition of the circuit breaker, and adjust the adjustment. The device sends out different quantitative control information and automatically adjusts the relevant parameters to obtain the motion characteristics suitable for the current system working state, and then makes the circuit breaker act. Its core is to automatically select the parameters of the operating mechanism and the pre-specified working conditions of the arc extinguishing chamber according to the different fault currents monitored, and disconnect at low speed when the current is small, and disconnect at high speed when the current is large, to obtain the best electrical and mechanical performance. Turn on effect.

Analysis of the working principle of intelligent circuit breaker--features

A new circuit breaker secondary system is established with microelectronics, computer technology and new sensors to realize the intelligence of the circuit breaker, so that it can adjust the on-off angle according to the voltage waveform, and accurately control the on-off process time and arc extinguishing chamber conditions. The power electronic device replaces the traditional mechanical operating mechanism, which greatly improves the action performance of the circuit breaker.

By effectively monitoring the operating status of the circuit breaker, the secondary system can dynamically evaluate the life of the circuit breaker, analyze the fault interrupting capability, realize the operation monitoring of the circuit breaker, conduct life cycle assessment and failure rate assessment, and improve the availability of the circuit breaker. The main monitoring links are:

• Counting the number of actions.

• Statistical breaking current value of fracture.

• Monitor the current waveform of the on-off coil and judge the fault.

• Monitor the pressure, temperature and density of the insulating medium in the arc extinguishing chamber.

• Monitor the on-off speed of the contacts and the state of the operating mechanism.

The widespread use of new microcontrollers (DSPs) makes it possible to realize and perfect the above-mentioned functions.

Conclusion

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