Researching And Simulation Of Computer Relay Protection Testing Device

This paper is completed depending on the project I took part in. It stands at the point of researching and introduces the current conditions and developments of microcomputer-based protection testing instruments. Some current problems are mentioned, and some of their solutions are given. At the same time, the working principle and the system configuration are introduced in detail. The paper expatiates on the basic mathematics model and kernel arithmetic , and brings forward the design scheme among each object experiment.In this research, the present fault theory is made more simply. Furthermore, several models are brought forward including the model of system impedance invariability, the model of short current invariability and the model of short voltage invariability. It gives the established courses of each model.The arithmetic of the cumulating error via changing the initial value of timer on synthesizing signal method is put forward.The relation between the harmonic output and the basic wave output on the method of synthesizing harmonic signal is discussed particularly. And the arithmetic realization is given.