Circuit Breaker Based On Modbus Field Bus

Along with the development of power technology and the increasing demand of users, power industry on the electrical properties of the increasingly high demand, request with a communication function appliances to achieve distribution network remote control, telemetry, remote adjustment and remote inquiry function of "four remote". From the current international development of low voltage power distribution, low voltage power distribution system through the field bus network become a new development trend. The world’s major companies such as Ge Corp, Schneider electric company, Siemens company, ABB low voltage electrical companies have developed or used in distribution system based on Modbus. Therefore the development of intelligent circuit breaker based on Modbus field bus is the requirement of market development, has the meaning of play a decisive role to the distribution system network. With the traditional communication circuit breaker can be compared, it not only has the traditional all function of the communication circuit breaker, and further with the operation terminal, the upper control management network connection and information sharing.This paper first analyzes the application status of field bus, the Modbus field bus technology is introduced, analyzed the development trend of intelligent power distribution control system. This paper uses C51 singlechip hardware circuit controller peripheral circuit, programmed with VC++6.0 dynamic link library(.DLL file) and with the circuit breaker communication and "Kingview" software interface implementation, implementation and breaker data exchange called dynamic link library configuration software.Secondly, because the MODBUS fieldbus using the RS485 communication interface, which is a joint project with low cost, can greatly reduce the complexity of circuit connection, may avoid the scene of electromagnetic interference on the impact of control equipment. This paper gives the hardware structure of the system, the system communication interface module, PC circuit breaker on scene by configuration software to realize the control, Modbus bus PC connection with the controller.The lower computer software based on Modbus protocol software and "Kingview" software development dynamic connection, the Modbus field bus technology in the circuit breaker based on. Lay the foundation for the future development of other circuit breaker fieldbus.Finally, through the communication between PC and controller test, to verify the Modbus field bus technology in the realization of circuit breaker based on.