大型水轮发电机微机型主保护设计方法再商榷  

Reconsideration of the design method of microcomputer-based main protection for large hydro-generator

作　　者：王维俭[1] 桂林[1] 王祥珩[1] 孙宇光[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《继电器》2002年第9期1-6,共6页Relay

摘　　要：大型水轮发电机内部短路微机型主保护的设计方法一般仍沿用模拟式保护的做法 ,即装设 1或 2套纵差保护和 1或 2套横差保护 ,前者以机端两相短路校验其灵敏度 ,后者因不清楚定子绕组内部短路的计算方法 ,只能放弃灵敏度校验。这种设计方法不可能真正做到定子绕组各种短路具有双重主保护的要求。对于容量相同的两台水轮发电机 ,不管定子绕组结构的不同 ,互相照搬主保护配置方案 。The design method of microcomputer-based main protection for large hydro-generator continues to use the method of the analog type protection.The main protection for S/C in a large hydro-generator is habitually configured with one or two sets of longitudinal differential relay and one or two sets of transverse differential relay.The sensitivity of longitudinal differential protection is checked by the S/C current at generator terminal,and the checkout of the sensitivity of transverse differential protection is abandoned without the availability of the calculation method of the internal faults of stator winding.The above design method doesn't really assure all kinds of internal faults of stator winding are tripped by two sets of protection.The popular practice that different types of hydro-generators with similar capacity and different winding construction use the same disposition of main protection may lead to harmful results in operation.

关 键 词：大型水轮发电机 微机型主保护 设计方法 定子绕组 零序横差保护 

分 类 号：TM315[电气工程—电机]