Abstract
The electrical power is the essential important energy in our daily life . The electric power industry plays a very important role in the national economy. The electrical power system is a very important energy department in the national economy ,and the substation’s design is an essential project in the electric power industry’s construction. The substation is made up of an electrical power system's set of unit equipments, which can transport, assign, interconnect, transform voltage and so on. There are big differences among different substation system’s design, which is decided by kinds of situation. Therefore, the substation’s function which are decided by substation equipment's capacity must be completed. These equipments include the transformer, the circuit breaker, the isolator, the bus bar, the electric current and the voltage transformer as well as other equipment and the instrument generally. This article introduced a factory’s 35KV substation’s design. There are detailed explanations about the main wiring's choice, the high pressure unit's choice, the load computation, short-circuit current's computation, each kind of relay protection's choice and the installation computation in the article, especially, the choice of main wring, transformer and some electric equipment such as circuit breaker, current and voltage sensor. Finally we use the CAD software to draw the high and low pressure to supply the electrical power distribution system and the substation construction chart.
Keywords :35KV substation ; the calculation of load; the choice of electric equipment; the graphics of CAD
