Design and Research of 110kv Intelligent Substation in Electrical System

Substation is an indispensable part of power system, responsible for the heavy task of power transmission and redistribution, and plays a pivotal role in the safe and economic operation of power grid. This design builds a 110 KV step-down substation. First of all, select the connection mode of each voltage level and choose the best flexible connection mode in terms of technology and economy. Secondly, calculate that short-circuit current. Obtain the values of the short-circuit steady-state current and the impulse current when the short-circuit occurs in the working bus of each voltage level from the three-phase short-circuit calculation. Finally, the equipment selection is made according to the rated voltage and the maximum continuous operating current of each voltage level, and then verified.