Abstract
The main task of this graduated design is to design a set of a microcomputer preotecting system for Jiaozuo Li Feng Power plant 3# generator-transformer transformer. Jiaozuo Li Feng power plant protective devices used are more widely previous electromagnetic type protection devices becouse it has been built many years ago . This design is to substitute it on base of the original Electromagnetism type protected system,according to the graduated design ,we will further understand, study，make use of microcomputer preotection to carry out automation of electric power system.
It is very important to make use of microcomputer in the raising protection devices and circuits to make the electricity system more secure, reliable electricity. To improve the people's living standards and the development of productive forces and the promotion of health of the entire national economy, sustained and rapid development is essential. Although the aim of achieving the power system automation, improve safety factor, but is not wasted, so how can we design the economic system and the reliability of protection devices such as indicators for each designers must consider. Throughout the design process, hardware device is to achieve the desired purpose infrastructure, as it did not support, even the soft ware also be its battlefield. Therefore, the choice of hardware devices becomes critical. I used more popular PIC SCM(singel chip microcomputer) in the market at present SCM .The SCM than other types, there are many advantages, such as here is not detailed, in subsequent chapters, I will present a few more pop market, and market share higher than the most detailed SCM the Xingjiabi scene clear. SCM includs the master data collection system (S/H), multi-path switching switches (MUX), A/D转换器, Flash procedures ROM, EEPROM data memory, Ram data memory, serial interface , parallel interface. There are other components of hardware circuits, 74LS164 Move deposits register, 74LS244 data buffers, CD4051 multiplexed choice switches, pressure sensors, digital led and such as electricity conversion chip MAX232 chip communication for the PC . At the highest possible to meet the protection requirements, simplify circuit is the current design of the objective pursued. This is useful for the protection of interference.
Keywords: Harvard bus Transformer microcomputer
