The Design Of Simulation Experiment Device For Electric Power Line Three Paragraph Protection

Relay protection simulation experiment is an important equipment of relay protection teachingpractice. Development and application of microcomputer relay protection technology to relay protectionteaching experiment into the lines. Traditional relay type of relay protection and microcomputer relayprotection device in engineering, can reflect different forms of relay protection, in order to adapt to theteaching, the main content is a typical electric power line a three-stage over-current protection, power lineprotection simulation experiment device is designed. The main result of meaningful embodied in:Power line relay protection simulation experiment equipment is put forward the overall framework,the framework includes a three-stage over-current protection based on relay, based on programmablecontroller PLC, a three-stage over-current protection and based on the microcontroller STC89C52simulation functions such as a three-stage over-current protection.Power line is given a three-stage over-current protection device of hardware and software design,complete embodies the relay protection of different methods of implementation. Based on three-stageover-current protection relay unit can be used to relay protection to protect the verification, embody thecharacteristics of traditional relay protection; A three-stage over-current protection based on PLC can beused to verify the computer protection. Based on single chip microcomputer protection outside has a higherprotection functions and also experiment with zero sequence current direction protection functions, can beused to verify reliability of relay protection of microcomputer type, ease of use and function expansion.Paper also gives a power line protection simulation experiment device of three stages of teachingexperiment, and experimental verification, the results show that the simulation test device reliable operation,can better reflect intuitive nature of the protection of traditional relay type at the same time, and can reflectthe advanced nature of modern relay protection of microcomputer type and teaching unit design isreasonable, easy to use and has high practical value.