Acb Intelligent Controller

The low-voltage frame circuit breaker is one of the main electric apparatus switches in the low-voltage power distribution network, It can put through and disconnect not only normal load current and overload current but also short current. It is mainly used in the not frequently operated low-voltage power distribution line or cubicle switchboard and served as power switch, and protect circuit, electric equipment, etc, When they take place overcurrent, overload, shorting out, loss of phase, leaking electricity, etc, it can cut off the circuit automatically, so it is used widely. The intellectual controller is a protector of the frame breaker, and is a key control device of the circuit breaker too. In the 1990s, with the development at full speed of electric and electronic technology, microelectric technique, computer technology and communication technology, the protector of the circuit breaker has already been lead by traditional electromagnetism release to develop into a electronic release which adopts the integrated circuit, until presenting the intellectual controller with high performance microprocessor at present. The intellectual controller of new generation adopts the module structural design, incorporate functions, such as measurement , monitoring , controlling, communication, protecting, etc. into an organic whole, widely used in the low-voltage system. According to the specification requirement and design index of the intellectual controller, we have designed a intellectual controller which is suitable for the present domestic demand.This text introduce the design principle of intellectual controller, including measurement and protection principle of algorithms and the protection function principle, and has carried on the concrete design of hardware and software modularization, aim at realizing various kinds of functions, such as measurement, monitorin, controlling, communication, protecting of the intellectual controller, etc. In this text, we optimize protection algorithm, overcome the shortcoming that is tripping slowly of congener product, have well solved the contradiction of tripping betweensensitivity and accuracy.Among this subject, this intellectual controller regards DSP chip TMS320LF2407 which Ti Company produces as the key processor on the hardware, it is mainly deal with trouble protection in circuit breaker and gathering data in real time. Hardware adopts standardized module design method, hardware circuit choose standardization, module typical circuit of structure as much as possible, in order to expand. Abundant user resources make this controller able to meet domestic most users' request, friendly user's interface makes the operation of the controller more simple and more clear . The software adopts the module design method, uses the assembler language and C language to mix programming way, have improved the execution efficiency of giving consideration to the procedure that programming efficiency can be very good greatly.Finally, using full duplex serial port of SCI of TMS320LF2407 itself, we put forward a plan of communication module design on the basis of RS- 485 bus to LonWorks field bus. It has realized the two-way communication function between the intellectual controller and PC. Achieves the purpose of remote control and remote adjust through field bus system, makes performance strengthen of the intellectual controller, accord with the demands for distribution system.