文档介绍：摘要
煤矿地面变电所是煤矿供配电的重要组成部分，它直接影响整个煤矿供电的可靠运行，是联系地面与井下的中间环节，起着变换和分配电能的作用。电气主接线是地面变电所的主要环节，电气主接线的拟定直接关系着全所电气设备的选择、配电装置的布置、继电保护和自动装置的确定，是决定变电所电气部分技术经济性能的关键因素。
本设计初步设计了煤矿地面35kV变电站的设计。设计过程主要包括负荷计算、主接线设计、短路计算、电气设备选择、继电保护方案等。通过对煤矿35KV变电站做负荷统计，用需用系数法进行负荷计算，根据负荷计算的结果确定出该站主变压器的台数、容量及型号。用标幺值法对供电系统进行了短路电流计算，为电气设备的选择及校验提供了数据。根据煤矿供电系统的特点，制定了矿井变电所的主结线方式、运行方式、继电保护方案。其中35kV侧为内桥接线，6kV主接线为单母分段。两台主变压器采用分列运行方式。并根据电流整定值以及相关数据的校验，选择了断路器、隔离开关、继电器、变压器等电气设备。
关键词：变电所；地面；选型；系统设计；
Abstract
Coal mine ground substation is an important part of the coal mine power supply, it directly affect the reliable operation of the whole coal mine power supply, is contact with the ground and underground of the intermediate links, plays a transformation and distribution of electric energy effect. Ground substation main electrical wiring is the main link, the main electrical wiring to unsafe has a close relationship with the selection of electrical equipment, power distribution equipment layout, the determination of relay protection and automatic device of electric substation technical and economic performance is the key factor.
The preliminary design of the coal mine ground, 35 kv substation design. Its design process mainly include load calculation, the main wiring design, short-circuit calculation, electrical equipment selection, relay protection scheme, etc. Through to the coal mine do load statistical 35 kv transformer substations, the demand factor method for load calculation, according to the result of load calculation to determine the station of the main transformer sets, capacity and model number. With the method of power supply system for the short-circuit current calculation, provides the selection of electrical equipment and calibration data. According to the characteristics of the coal mine power supply system, make the mine substation main connection mode, operation mode, relay protection scheme. Within 35 kv side for bridge connection, 6 kv single mother block