Abstract
The factory power supply system is to reduce the power system of redistribution of power to each power plant or the workshop, and it is made up of step down transformer , high-voltage power distribution lines, workshop substation , low-voltage distribution lines and electrical equipment. The total step-down substation plant and its distribution system designing is based on the various workshops of the number and the nature of the load, the produce processing on the load requirements as well as load distribution, and also combining with the national power supply situation in various departments to resolve the safty, reliability, economical and technological of the problem of the distribution of power. The basic content of this article are the following: the entire plant loading statistics, selecting the number and its capacity of the plant and substation transformer, selecting the number and its capacity of the total substation transformer,the design of the draft of distribution system ,the calculation of short-circuit current,the selecting of high and low voltage power distribution equipment (cabinet), High and low pressure round choice,the device settings of relay protection , drawing the picture of total substation of the power supply system and so on。