电气技术2024，Vol.25Issue(11)：81-84,4.
PST—1200U差动保护励磁涌流判据失效原因分析及改进
Analysis and improvement on the failure of block of magnetizing inrush current criterion in PST—1200U
王婵媛 1孔茗2
作者信息
- 1. 国网江苏省电力有限公司丹阳供电分公司,江苏 镇江 212000
- 2. 国网江苏省电力有限公司镇江供电分公司,江苏 镇江 212000
- 折叠
摘要
Abstract
The PST—1200U series transformer protection device based on waveform symmetry principle has an internal threshold value.When the secondary value of excitation inrush current is lower than the internal threshold value of the device,the protection device does not distinguish it from the excitation inrush current and treats it as a general differential current.If the startup setting of differential protection is less than threshold value,it will form a blocking"dead zone"for excitation inrush current,leading to differential protection false tripping of the switch.This article analyzes the reasons for the blocking"dead zone"of excitation inrush current,provides corresponding solutions and verifies them through on-site tests and actual airdrop transformers.关键词
差动保护/励磁涌流/波形对称制动/门槛值Key words
differential protection/magnetizing inrush current/waveform symmetric braking/threshold value引用本文复制引用
王婵媛,孔茗..PST—1200U差动保护励磁涌流判据失效原因分析及改进[J].电气技术,2024,25(11):81-84,4.
