2×300MW发电厂电气的一次设计【荐】.pdf

2×300MW 发电厂电气的一次设计 摘 要；本次设计为 2×300MW 发电厂电气的一次设计，内容包括：电气主接线方案的拟定、比较 和选择；三相短路电流的计算；主要电气设备和导体的选择；设备汇总和绘制主接线图。根据对发 电厂的装机容量，进、出线数目等进行分析，主接线采用双母线接线型式，这样充分保证在任一母 线故障和检修时不影响电厂的运行；厂用电接线方面，采用高压6kV，低压380/220V 的单母线分段 接线型式，备用电源取自系统，以保证一类、二类负荷的不间断供电。短路电流计算按最严重的三 相短路考虑，采用运算曲线法只对220 kV 母线上三相短路的情况进行了计算，根据已知参数和计算 结果分析，进行主要电气设备和导体的选择，包括母线、主变压器、高压断路器、隔离开关等，并 对开关设备进行了校验，最后进行了主接线图的绘制。 关键词：双母线；厂用电；短路电流；电气设备 2×300MW An Electrical Power Plant Design Abstract: This design is for the 2 × 300MW generating unit, including the development, comparison and selection of plan of main electrical connection, selection of main electrical equipments and conductor, equipment list and main wiring map. According to installed capacity, number of advance wire and outgoing line of the power plant, double bus connection has been selected as main connection, in order to avoid cutting down of power production when either of the two buses meets breakdown or overhauling situations. On works load, high voltage power of 6 kV and low voltage of 380/220 V single bus connection are selected. Backup power is contained by the system itself so that power supplies on both first-class and second-class loads are continuous. Short circuit calculation is concerned in the worst situation of three phase short circuit, and only calculated three phase short circuit on 220 kV bus by method of operational curve. According to known parameters and result of calculation, main electrical equipments, includes main connection wires, main transformers, high-voltage circuit-breakers and disconnecting switches, and conductor were selected. In the same time, check of switchgears was also obtained. In the end, sum of equipments and drawing of main circuit wiring diagram were also finished