Under the background of building a unified and strong smart grid, how to meet the requirements of smart grid informatization, digitization, automation and interaction as one of the core components of power transmission and distribution equipment, vacuum circuit breakers, has become a common cause of research institutions and manufacturers. Hot topics of concern.

From the perspective of users' future needs, in addition to the general functions of vacuum circuit breakers, intelligent vacuum circuit breakers should also have sensing functions, thinking and judgment functions and executive functions. That is to say, it should not only have the function of sensitively and accurately obtaining a large amount of surrounding information, but also the function of analyzing, processing, issuing and monitoring the obtained information, and also having the functions of effective feedback and necessary operations on the results of analysis and processing. Function.

In response to the above requirements, intelligent vacuum circuit breakers face three technical problems that need to be broken through.

The first technical problem is to implement the perception function. This is the basis of intelligence. The realization of this function must rely on modern sensor technology to obtain information such as voltage, current, insulation (partial discharge), distance, speed, temperature, etc. These signals can accurately, reliably and sensitively reflect the change of information. In addition to its own high quality and high reliability, the sensor should also have the characteristics of adapting to the working environment of the circuit breaker, small size and easy installation.

The second technical problem is to realize the function of thinking and judgment. This is the core of intelligence, and the realization of this function must rely on modern electronic technology, computer technology and communication technology. The input of the intelligent controller includes the information obtained from the sensing function, the information from the feedback of the executive function, and the control information from the system; after synthesizing these information, the intelligent controller can automatically identify the working state of the circuit breaker and adjust it automatically. The operation information of the circuit breaker, the automatic recording of key information, the automatic diagnosis of the components and operation of the circuit breaker and other intelligent thinking judgments; the output of the intelligent controller provides operation instructions for the execution function on the one hand, and provides the circuit breaker work for the system on the other hand. status information. In addition to the intelligent thinking and judgment function, the intelligent controller must also have the functions of high reliability, long life and strong anti-electromagnetic interference.

The third technical problem is to implement the executive function. The executive function must operate reliably according to the operation instructions issued by the controller to complete the closing and opening of the circuit breaker; at the same time, the executive function must have the functions of high reliability, long life and small size. The permanent magnet operating mechanism that has been developed and applied at present can basically meet the requirements of the intelligent circuit breaker for the executive function.