The design of electrical system of the 110kV region step-down transformer substation
Abstract
The technology of the transformer substation is through the development of several dozens of years. It has formed some standards and is inclining to already and gradually mature. The design of the electrical system of the 110kV region step-down transformer substation is also carried on defers to the requests of these standards. Firstly, I made a simple summary of the present situation of our country's electric power industry, the policy of our country, the goal and the duty of my design. Then I carried on the burthen statistics and calculation of the transformer substation by analyzing the data. Make use of the result of the calculation again to select the capacity and the quantity of the main transformer set, and also the main knot line project really. Then I chose the high-pressure switch equipments after the short-circuit calculation. Considering when the system breaks down, it must have a homologous protection device, therefore I has given specify introduction of the relay protection. I also carried on the electrical arrangement and the design of the power distribution equipment. At last, considering the electricity press which comes from exterior thunder and lightning, I also design the protecting device.
Keywords: 110kV region step-down transformer substation, main transformer, relay protection