摘要:供应红草地区的输电线路已接近满载运行，并已无路径供新增负荷，而且用电负荷也增长较快，预计在2015年该地区电负荷将达到40MW。广东电网公司汕尾供电局根据分层分区的供电原则，并按《汕尾市 “十一五” 电网规划》，拟定在红草镇建设一座110kV变电站，来满足该地区用电需求，同时也改善了汕尾城区的110kV主网结构及10kV配电网结构，提高供电的质量和可靠性。

本文主要内容是汕尾110kV红草变电站一次部分的初步设计，包括主接线选择、主变的选择、短路电流计算、直流系统设计、高压电器设备选型、母线系统设计、配电装置设计、防雷接地保护设计及部分图纸绘制与修改。

其中，课题研究的负荷、主变容量及台数都已给定，主要完成的设计任务是确定红草站接入系统方案、选择电气主接线方式、选择主变压器、计算短路电流，并根据短路电流结果选择高压电器设备；直流系统、母线系统、配电装置、防雷和接地保护均采用南方电网2009年版的《南方电网变电站标准设计细化方案，第三卷 110kV变电站标准设计细化方案，第十篇 CSG-110B-3B24AWD方案》；另外，结合红草站实际来修改典型设计图纸。

110kV红草变电站最终规模为三台50MVA的双绕组变压器；110kV共4回架空出线，采用单母线断路器分段接线，10kV共36回电缆出线，采用单母线双分段四段母线接线。

关键词：变电站，110kV，初步设计，一次部分，主接线，主变压器

Abstract:Supply of red grass area close to full load running transmission lines, and is no longer the path for new load, and electricity load also increased rapidly in the region in 2015 is expected to power load will reach 40MW. Shanwei Power Supply Bureau of Guangdong Power Grid Corporation's electricity supply according to the principle of hierarchical partition, click the The Eleventh Five Power System Planning of Shanwei, prepared to build a town in the red grass 110kV substation, to meet electricity demand in the region, but also improve the Shanwei City 10kV 110kV main network structure and distribution network structure and improving the quality and reliability of power supply. This article content is one of Shanwei 110kV substation red grass part of the preliminary design, including the main connection options, choice of main transformer, short circuit current calculation, dc system design, high voltage electrical equipment selection, bus system, power distribution equipment design, lightning protection Ground protection design and some drawings and modifications. Among them, the research load, the number of main transformer capacity and Taiwan have been given, mainly to complete the design task is to determine how the Station Access System, select the main electrical wiring, select the main transformer, calculating short-circuit current, and under short-circuit current Select high-voltage electrical equipment results. DC systems, busbar systems, power distribution equipment, lightning protection and grounding protection are used China Southern Power Grid Company in 2009 edition of Substation in refining the program, The Volume III thinning 110kV Substation in the program, The 10th Chapter CSG-110B-3B24AWD program. In addition, the combination of real red grass station to modify the typical design drawings. The Substation 110kV three final size of the two-winding transformer 50MVA; 110kV overhead of 4 Back to qualify a single bus section circuit breaker wiring, 10kV cable outlet 36 back to a single bus Double Segment Siduan Busbar.

Keyword: Substation, 110kV, preliminary design, a part of the main cable, main transformer