This paper first book according to the mission to system and routes and all load parameter, this paper analyses load development trend. Consult the relevant information design first, collection and research a lot of material, and translate the related foreign material, then analyzed to load, precise calculation and analysis of load growth from the necessity of clarified, then through wipeout of substation of generalization and built to qualify to consider, and through the direction of load data analysis, safety, economy and reliability into consideration, determine the 35kV voltage level 110 kv and worked two approach compared with cable connections to determine the Lord in ways that do the Lord wiring system design, 110 kv side chose to expand inside bridge connection mode, the consumers 10KV single busbar subsection wiring way, then through the load calculation and power supply range identified the main transformer sets, capacity and model, with three, determine the transformer capacity as the 50000KVA, SZ10-50000 / type, then the standard 110 to short-circuit calculation method of what value is analyzed and processing. According to the maximum continuous working current and short circuit calculation results of calculation of isolating switch, bus, voltage transformer, current transformer and the selection. On the main transformer in setting calculation and analysis of the lightning part, determine the calculation and analysis, the method, and lightning made corresponding principle diagram. Thus finished 110 kv substations electrical parts of the consumers 10KV/design. 满意不?