大型汽轮发电机失磁保护定值整定探讨  

Discussion on setting calculation of large steam turbine generator loss-of-excitation protection

作　　者：徐业荣 包明磊[1,2] 李玉平[1,2] 桑建斌[1,2] 李明 

机构地区：[1]南京国电南自电网自动化有限公司,江苏南京211100 [2]国电南京自动化股份有限公司,江苏南京211100

出　　处：《电力系统保护与控制》2016年第20期154-159,共6页Power System Protection and Control

摘　　要：通过分析大型汽轮发电机失磁故障时机端阻抗变化与功率输出变化,比较两种失磁保护方案:阻抗原理和逆无功原理失磁保护。经过比较发现两种保护原理主判据实质上相同,信号出口方式相同。针对逆无功原理失磁保护定值整定没有导则问题,提出阻抗动作边界映射至P-Q平面方法,确定发电机失磁故障时功率动作边界。克服逆无功原理失磁保护逆无功定值依靠工程经验整定困难,进一步提高保护定值整定可靠性。以一台1 000 MW汽轮发电机参数作为计算实例,计算两种保护原理的保护定值,为双重化双原理失磁保护配置提供具体参考。This paper compares the two criterions of generator loss-of-excitation protection based on impedance principle and inverse reactive power principle, by analyzing the variation of the steam turbine generator＇s power output and generator-end impedance. The main criterions of the two protection principles are demonstrated the same principle and trip mode. The main action area of loss-of-excitation protection based on impedance principle is mapped from impedance plane to P-Q plane, in order to get the power action area. The function can save the setting calculation of the latter one from engineering experience. Finally, taking a 1 000 MW steam turbine generator as an example, the setting calculation of the two kinds of protection principles are calculated, which provides a specific reference for the dual principle loss-of-excitation protection configuration.

关 键 词：汽轮发电机 失磁保护 阻抗原理 逆无功原理 定值整定 

分 类 号：TM311[电气工程—电机]