35kV_110kV变电站电气主接线部分设计.doc

110kV/35kV变电站电气主接线设计
摘要
本文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。设计首先查阅了有关资料,收集与研究课题大量的资料,并翻译了相关的外文资料,然后对负荷分析进行了精确的计算与分析,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与35kV两个电压等级,用拟定方法进行比较从而确定主接线的连接方式,对主接线系统的做了设计,110KV侧选择了单母线分段接线方式,35KV单母线分段带旁路母线接线方式,然后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,确定了变压器用两台,容量为31500KVA,型号为SSZ9—31500/110,对无功功率补偿做了明确的计算,然后采用标幺值法对短路计算进行了分析与处理。根据最大持续工作电流及短路计算的计算结果,对高压熔断器,隔离开关,母线和电压互感器,电流互感器进行了选型。对主变压器进行整定计算与分析,对防雷部分进行了计算和分析,确定了防雷的方法,并做出了相应的原理图。从而完成了110kV/35KV变电站电气部分的设计。
关键词:变电站;变压器;电气主接线
Abstract
In this design, on the basis of the mandate given by the system and the load line and all the parameters, load analysis of trends. Design First check the relevant information collection and research topic a lot of information and foreign-language translation of the relevant information and then load analysis of the precise calculation and analysis, load growth from the establishment of the need to clarify, and then passed on The proposed substation and the general direction of Chuxian to consider and, through the load data analysis, security, economic and reliability considerations, identified 110 kV and 35kV two voltage levels, compared with developed methods to determine the main wiring connections , The main wiring system to do the design, 110 KV side of the single-choice sub-bus connection mode, 35 KV sub-bus with bypass bus connection mode, and then through the load calculation and determine the scope of the main electricity transformer Number, capacity and Models, identified by two transformers, the capacity for 31500 KVA, the model SSZ9-31500/110, the reactive pensation to a clear, and per-unit value method used to calculate a short-circuit analysis and treatment. According to the most sustained work and short-circuit current calculation of the results, the high-voltage fuse, isolating switch, bus and voltage transformers, current transformers for the selection. The main transformer for setting calculation and analysis, part of