Abstract
Energy is the major energy in modern industrial production. With the substation well designed , power grids and electrical systems run more safely, economical, and stabilitical. This design is about 35kV substation’s main wireless design. First of all , through analyzing the original design materials, calculating the load throughout the factory and choosing the corresponding quantity and capacity of the main transformer, the concrete power supply system can be made accordingly. Then for the primary system, not only the relevant short-circuit should be calculated but also the high-voltage equipments should be selected and examined. Meanwhile, the high-voltage circuit should also be selected and examined. Finally the relay protection of power system should be given a short explanation. According to the operation of the substations in our country and the standard of various electrical apparatus such as transformer, switch, circuit and so on, the electrical apparatus can be selected concretely and quantatively with the combination of the basic knowledge of textbooks. At last the concrete system drawing of electricity supplied by substations in factories can be created.
Key words:transformer, substation, short-circuit current, protection system