车间低压配电系统及车间变电所设计.pdf

本设计是机械厂机加工车间的低压配电系统及车间变电所供电系统。本文首先进 行了负荷计算，根据功率因数的要求在低压母线侧进行无功补偿，进而确定对主变 器容量、台数，从经济和可靠性出发确定主接线方案。其次，通过短路电流计算出 最大运行方式和最小运行方式下的短路电流，确定导线型号及各种电气设备。最后 根据本厂对继电保护要求，确定相关的保护方案和二次回路方案。 本设计采用需用系数法进行负荷计算，无功功率补偿采用低压侧电容并联补偿 方法，这种方法能补偿低压侧以前的无功功率、经济效益比较好。根据机械加工车 间用电特点和需求，主接线方案采用了高压侧无母线、低压侧单母线分段的主接线 方案。 根据干式变压器与油浸变压器在经济和安装条件对比， 选择两台 SC9-500/10 系列干式变压器。 在仔细研究各负荷的实际数据，并严格按照国家规定，依照以上设计步骤设计本供电 系统设计方案，以到达提高生产效益的目的。 关键词：低压配电系统；负荷计算；主接线；变电所；短路计算 Abstract This design is the factory machining workshop of low voltage distribution system and workshop substation power supply system . This paper conducted a load calculation, according to the requirements of power factor in the low-pressure side of the bus reactive power compensation, and to determine the capacity of the transformer device, the number of units, starting from the economic and reliability to determine the main terminal , calculate the maximumshort circuit current operation modeand minimumoperating modeof the short circuit current to determine the wire type and variety of electrical , according to the factory on protection requirements, identify relevant programs and secondary circuit protection program. This design uses the need coefficient method for the load calculation , reactive power compensation capacitor in parallel with low-pressure side of the compensation method, this method can compensate for low-voltage side of the previous reactive power, economic efficiency is better. According to machine shop characteristics and needs of electricity, the main connection schemes using non-bus high side, low side of the single-bus section of the Main to dry-type transformers and oil immersed transformers and installation conditions in the economy compared to select two SC9-500/10 series of dry-type transformers. Only then carefully studies the factory the actual data, strictly stipulated