Abstract
As the modern enterprise production scale expansion of the factory, the load capacity of electricity is accompanied by the increase, companies often need to set up factories within the overall step-down stations to meet the needs of the production scale. It bears the grid voltage step-down, draw power from the power plant directly to the production equipment is powered or forwarded to the important task of substation plant, the factory power supply system is the business hub. So the design should be fully taken into account, to seek perfection, to ensure the production of the factory work can be normal, stable and reliable manner.
Factory floor factory building the power supply design is an important part of the design. Power supply design quality, will directly affect future production and development plant. Especially for those high degree of automation of industrial production for large-scale modern factory, if there is a high-quality power supply system, then, will be conducive to the rapid development of enterprises. Stable and reliable power supply system and help the factory to increase product yields, improve product quality, reduce production costs and increase economic efficiency of enterprises. If the power supply system design quality, and will give businesses, causing incalculable damage to the country.
Keywords Substation；Load-calculation；Transformer；Relay-protection
