中国电机工程学报2024，Vol.44Issue(5)：1726-1736,中插5,12.DOI:10.13334/j.0258-8013.pcsee.222522
基于剩余电流和不平衡电流突变向量比的TN-C-S系统漏电故障检测方法
Leakage Fault Detection Method for TN-C-S System Based on Residual Current and Unbalanced Current Mutation Vector Ratio
摘要
Abstract
TN-C-S system is widely used in China.Due to the large inherent residual current and the difficulty in distinguishing the residual current mutations caused by load switching or faults,level 1 and 2 leakage protection cannot be put into operation.Serious safety hazards exist in TN-C-S systems.To solve this problem,a leakage protection method based on the ratio of the residual and unbalanced current mutation vectors is proposed.First,the residual current loop is analyzed,and it is concluded that the ratio of residual current and unbalanced current mutation vectors changes with the grounding faults but not with the load switching.Then,the mutation of the fault current is calculated based on the stabilization of the neutral line impedance and the system grounding impedance and leakage faults are detected with the criterion that the calculated fault current exceeds certain threshold.Simulations and tests prove that the proposed method can effectively distinguish the residual current variation caused by load switching and leakage fault,and realize the leakage fault detection on the condition of large inherent residual current.The detection sensitivity in single-branch and multi-branch systems is 70 and 150 mA,respectively,satisfying the sensitivity requirements for the multi-level leakage protection of TN-C-S systems.关键词
TN-C-S系统/漏电保护/剩余电流/不平衡电流/突变向量Key words
TN-C-S systems/leakage protection/residual current/unbalanced current/mutation vector分类
信息技术与安全科学引用本文复制引用
翟国亮,梁栋,王玮,徐丙垠,高海洋,尚同同..基于剩余电流和不平衡电流突变向量比的TN-C-S系统漏电故障检测方法[J].中国电机工程学报,2024,44(5):1726-1736,中插5,12.基金项目
国家自然科学基金项目(52077221). Project Supported by National Natural Science Foundation of China(52077221). （52077221）
