xxx110kV中型变电所电气部分的设计.doc

xxx110kV中型变电所电气部分的设计 中 文 摘 要 本次所设计的变电所是一个处于地区网络枢纽点上的重要降压变电所，它主要担任将功率从110KV变换到 35KV侧线路。且本所位于市郊区、稻田、丘陵，所址工程情况良好。 在本文中，将变电站一次部分成若干部分来设计，即：变压器、主接线形式、短路计算、电气设备、总平面布置和配电装置等。其中由于变电站中核心设备是变压器，所以变压器的选择定型是重点论述的。在本文中是通过台数、容量、型式等方面达到的，定型号为SFSZ10-125000/110。 主接线对电力系统及变压器运行的可靠性、灵活性和经济性密切相关，因此设计出符合技术要求且投资成本相对低的方案是十分必要的。本文中是通过先设计三个方案再比较选择其中最佳。 在第三章中是进行短路计算。由于电气设备的选择与校验都需要用到短路电流值，所以在进行电气设备选择之前必须进行短路电流的分析与计算。 紧接着在4对电气设备的选择做了介绍。而其中所用变压器则根据负荷及10kV母线上的设备来定型。 后面还对电气总平面布置和防雷保护与接地设计做了介绍与设计。 关键词：110kV，变电站，一次部分  Abstract This substation designed in this issue which is located at a node of powersystem is an important step-down substation. It main task is to transfor power from 110 kV side to 35kV side.It is located at suburb, paddyfield and hill.These places are vantage ground to build the substation. In this article electric part of one hinge substation is decoupled into several parts, transformer, the form of primary line, electrical equipment, the arrangement of the substation, electricity distribution equipment.As the transform is the core part of the substation, so that choice the type of transformer should be given more consideration.This work is base on the standard of quantity, capacity and type.In these considerations, This design choice SFZSZ10-125000/110. The reliability, agility and economy capability is close to the design of primary line.So it is necessary to design a substation which is in the limited of the standard and the cost is relative low.Three substation is compared in the article ,and the best one is given out from the three. Short circuit account is given out at chapter three.Both electrical equipment` choice and check need short circuit value, so that short circuit should be analyzed and accounted before electrical equipment`choice. Electrical equipment`choice is introduced in the next chapter.Transformer is choiced by the load and the equipment of the bus. In the last of paper we also introduced and designed the protectio