煤矿地面变电所设计讲解.doc

摘 要 本次设计为110KV变电站的初步设计书。首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了110kV，35kV，10kV以及站用电的主接线.对电气设备的选型作了详细的说明和计算，短路电流的计算有严格的计算书。又通过负荷计算及供电范围确定了主变压器台数，容量及型号。最后，根据最大持续工作电流及短路计算的计算结果，做出线路保护，变压器保护，母线保护，防雷保护，从而完成了整个变电站设计。 关键词:变电站；负荷计算；主接线；电气设备选型；继电保护 ABSTRACT The design of 110 KV substations is for preliminary design. First, according to the task given system and line book and all the parameters, make the analysis of load development trend. From the load increasing illustrates the necessity of the establishment of construction, and then through the generalization of substation and outlet to consider, and through the analysis of the data of load, safety, economy and reliability into consideration, determine the 110 KV and consumers 10 kV power station, as well as 35kV main connection. Analyses the argumentation of 110 KV substations auto-switch manner of various advantages of electrical equipment selection and calculation, the detailed description of short-circuit current calculation have strict calculations. And through the load calculation and scope of supply determined, the main transformer capacity and models. Finally, according to the maximum continuous working current and short circuit calculation results of calculation, make line protection, transformer protection, bus bar protection, lightning protection, substation to finish the whole design. Keywords: Transformer substation；Consideration of load；Main Connection ；the choice of Electrical Equipment ；Relay 1.1课题来源 1 1.2设计依据 1 1.3设计范围 1 1.4设计分工 1 1.5设计的基本要求 2 1．6基础资料 2 1.6.1原始背景资料 2 1.6.2变电站负荷情况分析 4 2 电气主接线方案的确定 5 2.1选择原则 5 2.1.1　主接线设计的基本要求 6 2.1.2主接线的设计依据 8 2.2主接线的方案与分析 8 2.2.1 110KV侧主接线设计 9 2.2.2 35KV侧主接线设计 11 2.2.3 10KV侧主接线设计 12 2.2.4 所用电设计 13 3 主变压器台数和容量的选择 14 3.1变压器的选择原则 14 3.2主变压器型式的选择 14 3.3主变中性点接地设计 15 3.3.1　110kV侧中性点接地方式 15 3.3.2　35kV、10kV侧中性点接地方式 15 3.4主变全绝缘、半绝缘、绕组材料等问题的解决 16 3.5变压器台数的选择 16 3.6变电站负荷计算 17 3.7变压器容量的选择 18 3