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 is closely related to reality in order to design the suitable substation by studying a lot of materials. The design not only adopts some stable-form and general protections but also adopts PC protection. The synthetically automation system of electric power supervision, which can make workers on duty control the situation of substation timely, operate the equipments directly, know the breakdown and deal with it without delay, so that the system of power supply is scientific and standard in management. What’s more, it can exchange data with other automatic systems and give full play to whole advantage in order to manage information in all systems as a whole. And 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 explanation.
Key words: relaying protection,35kv transformer station, Load forecasting PC protection, electric calculation