主变中低压分段备自投装置防轻载误动功能必要性论证  

Necessity Demonstration of the Anti Light Load Misoperation Function of the Main Transformer Medium and Low Voltage Section Backup Automatic Switching Device

作　　者：李文娟 张海涛 罗正娅 朱其虎 俸润林 Li Wenjuan;Zhang Haitao;Luo Zhengya;Zhu Qihu;Feng Runlin(Lincang Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Lincang 677000,China)

机构地区：[1]云南电网有限责任公司临沧供电局,云南临沧677000

出　　处：《云南电力技术》2023年第2期29-32,共4页Yunnan Electric Power

摘　　要：备自投装置在主变负荷轻载情况下,若母线PT因异常原因失压将导致备自投装置启动后动作出口,严重情况下可能导致全站失压事件的发生,在备自投装置增加防轻载判据时,判别逻辑中应引入进线电压,主变中低压侧断路器往往都未装设PT,进线电压通常引入上一级母线电压,为此对主变中低压侧分段备自投装置防轻载误动功能必要性进行论证,供同行的工作者进行参考。When the standby automatic switching device is under the light load of the main transformer,if the bus PT loses pressure due to abnormal reasons,it will cause the standby automatic switching device to operate and exit after it is started.When adding the anti-light load criterion,the incoming line voltage should be introduced into the judgment logic.The circuit breakers on the medium and low voltage sides of the main transformer are often not equipped with PTs,and the incoming line voltage is usually introduced into the bus voltage of the upper level.The necessity of the anti-light-load misoperation function of the sub-section automatic switching device is demonstrated for reference by fellow workers.

关 键 词：主变轻载 PT失压 防误动 

分 类 号：TM74[电气工程—电力系统及自动化]