Scholarlink

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.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Analysis and Improvement of Failure Reason for Excitation Surge Criterion of Main Transformer

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Ming Kong,
  • Chanyuan Wang,
  • Zhunian Wang,
  • Yiran Xu,
  • Lingling Sun

摘要

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.