Abstract
This paper aims to present the preliminary design of a pivot 220kV transformer substation. The design mainly includes four parts: drafting, comparison and choosing of main electric scheme; calculation of Short-circuit current; choosing of main electric equipment and the conductor; the gathering of the equipment and drawing of main writing diagram. The designed contents attempt to give a clear concept, a well-arranged process, contrasted pictures and texts, and complete forms.
The transformer substation is the important component of the power system. It is the vital part in the acceptance and distribution of electric energy, for it can complete the communication among different parts of the power system and enable the system’s stability. Main electric scheme is a main part of the transformer substation, and it directly influences the operation’s dependability and flexibility. Besides, the study out of main electronic scheme decides the choice of the electric equipment and the placing of the distribution devices, so it is the most important factor that decides the electric investment in a transformer substation. Taking dependability and flexibility into consideration, for 220kV and 110kV bus bar, the design adopts the line form of dual-node bus with bypass line. The design chooses the main electric equipment and choice of the conductor according to the known parameter and result of calculation, carries on the check-up of the switchgear, and finally present the gathering of equipment and the drawing of main wiring diagram.
Keywords：Transformer substation, Wire once, Short-circuit current, Choose electric equipment
