110kV变电站一次部分方案设计书.docVIP

摘要 变电站是电力系统中的一个重要环节，变电站中各种设备的合理选择和安全运行直接关系到电力系统的安全和稳定。因此，变电站中各种电气设备的选择、布置和保护设置是变电站设计中的一个重要组成部分。本文针对城网改造工程下的中里变电站进行重新设计。第一章主要阐述了变电站的发展现状和前景以及中里变电站的基本情况。第二章为负荷计算和主变压器的选择。第三章阐述了电气主接线的设计，根据进出线、负荷的性质等因素综合确定电气主接线的形式。先确定每一级电压下的基本接线形式，最后确定整个变电站可靠的、经济的、灵活的电气主接线形式。第四章为短路电流计算。明确短路电流计算的目的，确定了短路电流计算点，并做出等值电路图，从而进行标幺值的换算。第五章为电气设备的选择与校验。主要内容有母线、断路器、隔离开关、补偿电容器组、电流和电压互感器以及避雷器的选择等。一般是按正常条件选择，按短路电流校验。第六章介绍了配电装置。结合中里变电站的实际情况，确定中里变电站配电装置的形式。最后简要介绍了变电站的保护装置。 关键词：负荷计算；变压器选择；电气设备；继电保护 ABSTRACT Substation is an important link of power system， its appropriate disposal and safe operation will influence the stabilization and safety of power system directly. So more attention should be paid on the choice of the electric devices during the process of designing a transformer station.Chapter 1 mainly elaborated the development of present condition of the transformer substation and basic circumstance of the transformer substation of Zhongli.Chapter 2 computes for the burden and the choice of the main transformer. Chapter 3 elaborated the design of electricity lord connecting line, according to pass in and out the line, burden of property etc,then make sure the form of the connecting line .First make sure each class electric voltage under the basic connecting line form, and then make sure the whole transformer substation’s dependable, economic，flexible connecting line form. Chapter 4 for short-circuits current computation. Explicated short-circuit current computation goal, determined the short-circuiting current computation spot, and makes the equivalent circuit diagram, thus carries on the sign value conversion. Chapter 5 for electrical equipment choice and verification. The main content has the bus, enters the going beyond a line, the circuit breaker, the isolator, as well as the electric current and the voltage transformer choice. Generally the choice is according to the normal condition and the check of the electricity equipments is under short-circuiting electric current. Chapter 6 introduces