Abstract:Protection relay is the most important tool to make the power system work safely and improves the quality of power energy.With the expansion of the power system and the consumer raising higher requirement for quality of power energy,the protection r elay must be improved greatly and fulfill the high requirement. Electric current relay reflect circuit electric current changes but electric apparatus of movements. It used in motor or other overload of load and short out protection, direct current machine magnetic field control or lose magnetism not to protect etc.Electric current relay with can is it for pass electric current relay , owe electric current relay to divide according to use. In this paper, the method of design for currrrent relay is discussed. By the request of technologies, the electromagnetic system , airgap flux distribution and parameters of relay are researched,and combining the Pro/e proceeding the assistance designs, proceeding the limited dollar analysis with ANSYS. An effective method of design is implemented, according to the result of research..
Keywords: power system protection; current relay; electromagnetic system; spring system; thermal analysis