励磁系统PT断线及慢熔逻辑的应用研究  

Study on the Application of Excitation System PT Breakage and Slow Fuse Logic

作　　者：关延伟 于紫南 刘小芳 GUAN Yanwei;YU Zinan;LIU Xiaofang(RunDian Energy Science and Technology Co.,Ltd.Zhengzhou 450018,China;Jilin Power Supply Company,State Grid Jilin Electric Power Co.,Ltd.Jilin City 132011,China;Huarun Power Hunan Co.,Ltd.Chenzhou 423042,China)

机构地区：[1]润电能源科学技术有限公司,河南郑州450018 [2]国网吉林省电力有限公司吉林供电公司,吉林吉林132011 [3]华润电力湖南有限公司,湖南郴州423042

出　　处：《吉林化工学院学报》2024年第3期50-55,共6页Journal of Jilin Institute of Chemical Technology

摘　　要：励磁系统为防止PT一次保险熔断和一次系统接地故障引起的励磁系统误调节,PT断线逻辑的采样电压普遍采用线电压方式。发电机出口PT一次保险慢熔属于异常的运行工况,在此工况下,运行机组有较高的误强励磁误跳机风险。为快速甄别励磁系统PT慢熔故障,部分励磁装置增加了励磁慢熔逻辑,PT慢熔逻辑多采用双PT比较法,由于励磁系统PT慢熔定值以线电压为基准,逻辑判据以相电压为基准,两个基准电压间存在换算关系,导致现场励磁系统PT慢熔默认定值不合理性,不利于PT慢熔的快速判断。通过现场试验及励磁系统采样电压及励磁显示电压间关系的推导,对励磁系统PT断线、PT慢熔逻辑,PT断线及慢熔定值提出优化建议,为励磁系统安全稳定运行提供借鉴经验。To prevent the excitation system from misregulating due to the primary fuse of PT and the primary system ground fault,the sampling voltage of PT break logic basically adopts the line voltage method.The high-voltage primary fuse of the generator outlet PT is a special operating condition.Under this condition,the operating unit has a high risk of false over-excitation tripping.In order to quickly identify the PT slow-fuse fault of the excitation system,some excitation devices add the excitation slow-fuse logic.The PT slow-fuse logic mostly adopts the dual-PT comparison method.Since the PT slow-fuse set value of the excitation system is based on the line voltage,and the logic criterion is based on the phase voltage,there is a conversion relationship between the two base voltages,resulting in the irrationality of the default set value of the excitation system PT slow-fuse on site,which is not conducive to the rapid judgment of PT slow-fuse.Through on-site tests and the derivation of the relationship between the sampling voltage of the excitation system and the excitation display voltage,optimization suggestions are put forward for the PT disconnection,PT slow-fuse logic,and PT disconnection and slow-fuse setting values of the excitation system,providing reference experience for the safe and stable operation of the excitation system.

关 键 词：PT断线 PT慢熔 逻辑 定值 误强励 机组非停 

分 类 号：TM76[电气工程—电力系统及自动化]