一起断路器二次回路设计隐患分析与改进
李榜，傅一凡，孙亚辉
(国网福建省电力有限公司超高压分公司，福建 福州 350013)
摘 要：变电站内断路器随着运行年限、操作次数的增长，其二次元件逐渐老化，由于设计方面考虑不足引起的弊端逐渐暴露。从一起断路器重合闸失败的案例引入，介绍了二次回路绝缘、缺陷复现等现场检查情况，对分闸线圈励磁异常原因及液压机构快速泄压原因进行了分析，最终发现故障源头来自该型号断路器二次回路设计存在接点间电压互串的隐患，并针对性提出一种避免辅助开关电压互串的改进措施。经过对保护功能进行测试，测试结果合格，表明该举措在实际应用中具有可操作性强、简单高效的优势，为老旧设备消除缺陷、排除故障提供了一种新方法，也为新设备设计提供了新思路。
关键词： 变电站；断路器；二次回路；电压互串
中图分类号：TM561 文献标识码：B 文章编号：2097-6623(2026)01-0056-05
Analysis and Improvement of Hidden Danger Hazard in the
Secondary Circuit Design of a Circuit Breaker
LI Bang, FU Yi-fan, SUN Ya-hui
（UHV Branch of State Grid Fujian Electric Power Co., Ltd., Fuzhou 350013, China）
Abstract: With the increase of service life and operation times of circuit breakers in substations, their secondary components gradually age, and the drawbacks caused by insufficient design considerations are gradually exposed. Starting from a case of circuit breaker reclosing failure, this paper introduces the on-site inspection conditions such as secondary circuit insulation and defect reproduction, analyzes the causes of abnormal excitation of the opening coil and rapid pressure relief of the hydraulic mechanism, and finally finds that the source of the fault is the hidden danger of voltage cross-talk between contacts in the secondary circuit design of this type of circuit breaker. A targeted improvement measure to avoid voltage cross-talk of auxiliary switches is proposed. After testing the protection function, the test results are qualified, indicating that this measure has the advantages of strong operability, simplicity and high efficiency in practical application. It provides a new method for eliminating defects and troubleshooting of old equipment, and also offers new ideas for the design of new equipment.
Key words: substation; circuit breaker; secondary circuit; voltage cross-talk
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