发电机失磁保护定值整定的讨论--对2007年版《IEEE Guide for AC Generator Protection》的斟酌  

Discussion on setting calculation of generator loss-of-excitation protection:thinking of IEEE Guide for AC Generator Protection published in 2007

作　　者：王维俭[1] 桂林[1] 王雷[2] 王立群[2] 唐渝南[2] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]上海外高桥第三发电有限责任公司,上海200137

出　　处：《电力自动化设备》2009年第3期1-3,共3页Electric Power Automation Equipment

摘　　要：对2007年版《IEEE Guide for AC Generator Protection》中失磁保护定值整定的几个问题提出不同意见。明确指出:发电机失磁故障必有滑差(s),其平均异步阻抗Xd(js)Xd(s=0),失磁保护中的阻抗元件下端定值为-Xd,已有足够余度,不应该是-(1.1～1.25)Xd;在P-Q坐标与R-X坐标的转换公式中,U值应由"失磁保护动作滞后于低励限制线(UEL)"原则来确定,不应主观选择0.95UN。Opinions different from the setting calculation of loss-of-excitation protection in IEEE Std C37. 102^TM-2007 IEEE Guide for AC Generator Protection are proposed. It is clearly and definitely pointed out that： when loss-of-excitation occurs, there must be slip, the average asynchronous impedance Xd（js） is much smaller than Xd（s=0）, while the lower setting of impedance element is --Xd, which is far enough, -（1.1-1.25）Xd is not necessary; in the coordinates transformation formula between P-Q and R-X, the voltage U should be set according as the principle of ＂loss-of-excitation protection operates later than UEL （Under Excitation Limiter）＂, not to select 0. 95 UN subjectively.

关 键 词：发电机 失磁保护 定值整定 异步边界阻抗圆 静稳极限阻抗圆 

分 类 号：TM74[电气工程—电力系统及自动化]