Abstract:In the automation of industrial production, high-voltage power supply and power distribution are the most fundamental energy guarantee for a factory. That is to say, in order to make the systems of electric grid and electric power work safely, economically and stably as much as possible, the design requirements of the substation improve continuously, which is the only way to ensure industrial production and personal safety. This design instruction is designed for 35kV substations. 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 determined 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 reached.
Key words: transformer station;Load forecasting;transformer;electric calculation;choose and checkout;relaying protection