田庄煤矿供电系统设计.doc
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1、摘 要国民经济发展水平越来越高,人民对生活质量的要求也随之日渐提升,由此对电能产生着高度的需求性和依赖性,电力供应能否做到可靠、经济和灵活直接关系到经济能否平稳快速发展,电能的质量更是亟待进一步提升和完善。田庄煤矿35kV供电系统包括井上供电系统和井下供电系统两个部分。煤矿供电系统的设计主要包括:矿井负荷计算与无功补偿,变压器选择,主接线形式,短路电流计算、电气设备选择、继电保护方案、变电所的防雷保护接地等。本设计主供电系统由来自科苑220kV变电站,35kV经过主变压器变为6kV,其中35kV侧为全桥接线,6kV主接线为单母线分段方式,分别向地面和井下供电。论文采用了需用系数法对煤矿35kV
2、变电站进行负荷计算,并根据负荷计算的结果确定出该主变压器的台数、容量及型号。对供电系统进行短路电流计算,短路电流计算的结果为电气设备的选择及效验提供了数据,并对他们进行了动稳定和热稳定等方面的效验。为了及时切除故障设备,对变电所继电保护进行了整定计算。在线路上安装了阀型避雷器进行防雷保护,并在变电所安装了避雷针进行保护。关键词:煤矿供电系统; 供电设计; 负荷计算; 设备选择;继电保护ABSTRACT YueJin coal 35kV electricity supply system includes two parts of the underground power supply sys
3、tem and above ground power supply system. The design is based on the completion of the internship in the coal mine. YueJin Coal Mine through field visits, in conjunction with the existing level of production plant and the prospects for future development in the power supply system on the basis of th
4、e relevant provisions of the coal production industry further standardize and improve. The power system design of YueJin Coal Mine include: ground substations design, mine supply design, short circuit current calculations, ground and underground high-low voltage equipment selection, protection devic
5、es, ground and underground grounded. The design of main power supply system is from leap ofloop and the loop of the 35kV line power supply, 35kV to 6kV, after the main transformer Single Bus wiring of power supply to the surface and downhole. Through 35kV substation load statistics, use the coeffici
6、ent method for load calculation. According to the load calculation results, we can identify transformers number, transformers capacity, transformers model. Based on the short circuit current calculation, we can obtain data of electrical equipment selection and validation. According to the characteri
7、stics of power supply system in coal mine, developed mine substation main wiring mode, operation mode, relay protection scheme, which the 35kV side full-bridge wiring, 6kV main wiring for Single Bus way. Key words: substation; power supply design; load calculation; equipment selection目 录第一章 概论11.1前言
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