In the modern in power system, electric equipment, and numerous different components, easy operation complex various forms of electrical fault, so we must take measures to protect the relay to make the system more stable thesis is to 110 kv power to relay protection, research and design. This paper firstly based on the characteristics of power generators and transformers parameter setting calculation, through the calculation results identify CT/PT models. At the same time, this may appear on the various forms of short-circuit current exhaustive calculation. According to thisThe design parameters of short-circuit current, adopted a phase spacing protection and the zero sequence current protection relay protection measures of two. But because of relay protection device may be due to the defects in the misoperation, therefore also adopts the design of automatic reclosing technology, through the automatic reclosing device can reduce the misoperation, make the whole power system can be more stable words: relay protection, Phase spacing protection, The zero sequence relay protection, Automatic reclosingPlease answer all questions added: the detailed point, if the results, appropriate translation will reward points to additional!