发电厂电气主接线方案设计书.doc

螁肁蒅芆蚄蒂发电厂电气主接线设计膁薈蚈莇螂羈薀芈节莈膅薀设计者王健芄肈***膆芃螈蚃蝿芃芇薆羃班级10电42膂葿螁莈螄芄薂芀莅膆肆肁羁羀肁指导教师贾传胜朱呈祥邹宽胜***膅螆马兆兴李洪美(1123386605)··········································································································································································································································································································································································································································································19薅薃蝿附录一·······································20肂肈羆附录二·······································,其容量为2×100+2×300=800MW,占电力系统总容量800/(3500+800)×100%=%,超过了电力系统的检修备用8%~15%和事故备用容量10%的限额,说明该厂在未来电力系统中的作用和地位至关重要,但是其年利用小时数为5000h,小于电力系统电机组的平均最大负荷利用小时数(2006年我国电力系统发电机组年最大负荷利用小时数为5221h)。该厂为凝汽式电厂,在电力系统中将主要承担腰荷,从而不必着重考虑其可靠性。薈蚂膁从负荷特点及电压等级可知,,共有6回电缆馈线,与100MW发电机的机端电压相等,采用直馈线为宜。300MW发电机的机端电压为20kV,拟采用单元接线形式,不设发电机出口断路器,有利于节省投资及简化配电装置布置;110kV电压级出线回路数为5回,为保证检修出线断路器不致对该回路停电,拟采取双母线带旁路母线接线形式为宜;220kV与系统有4回路线,送出本厂最大可能的电力为800-200-25-800×8%=511MW,拟采用双母线分段接线形式。,结合对电气接线的可靠性、灵活性及经济性等基本要求,综合考虑。在满足技术,积极政策的前提下,力争使其技术先进,供电安全可靠、经济合理的主接线方案。***袅袆发电、供电可靠性是发电厂生产的首要问题,主接线的设计,首先应保证其满发,满供,不积压发电能力。同时尽可能减少传输能量过程中的损失,以保证供电的连续性,因而根据对原始资料的分析,现将主接线方案拟订如下:蚁莇薃(1):鉴于出线回路多,且发电机单机容量为100MW,远大于有关设计规程对选用单母线分段接线每段上不宜超过12MW的规定,应确定为双母线接线形式,2台100MW机组分别接在母线上,剩余功率通过主变压器送往高一级电压110kV。,有较大短路电流,为选择轻型电器,应在各条电缆馈线上装设出线电抗器。薆薅蚂(2)110kV电压级:出线回数大于4回,为保证检修出线断路器不致对该回路停电,采取双母线带旁路母线接线形式,以保证其供电的可靠性和灵活性。螂螀蒇(3)220kV电压级:出线4回,考虑现在断路器免维护减小投资,采用双母线分段接线。通过两台