Aiming at the optimization of relay protection setting in photovoltaic grid-connected substations,this paper analyzes the structure and parameters of power supply system including distributed photovoltaic,and puts forward a calculation method of short-circuit current considering the influence of photovoltaic grid-connected substation.On this basis,the current setting and action time setting principles of transformer protection and line protection are discussed in detail,and specific setting suggestions are given.Through reasonable protection setting optimization,the protection performance of photovoltaic grid-connected substation can be effectively improved,and the safety and reliability of the system can be improved.
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