Transmission Line Distance Protection Under Current Transformer Saturation

作     者：Yuping Zheng Tonghua Wu Feng Hong Gang Yao Jimin Chai Zhinong Wei 

作者机构：the College of Energy and Electrical EngineeringHohai UniversityNanjing 210098China State Key Laboratory of Smart Grid Protection and ControlNARI Group CorporationNanjing 211106China Changzhou Institute of TechnologyChangzhou 213032China 

出 版 物：《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报（英文）)

年 卷 期：2021年第9卷第1期

页      面：68-76页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080801[工学-电机与电器] 0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：supported by Science and Technology Program of State Grid Corporation of China “Research on Fault Coupling Characteristics and New Protection Principle of AC/DC Hybrid Power Grid” 

主　　题：Breaker-and-a-half configuration current transformer(CT)saturation distance protection power frequency variation operation voltage 

摘      要：Conventional transmission line distance protection approaches are subject to malfunction under reverse fault-induced current transformer(CT) saturation for the typically employed breaker-and-a-half configuration. This paper addresses this issue by proposing a new distance protection approach that combines the blocking and unblocking criteria of distance protection based on the values of incomplete differential current,operation voltage, and current harmonic content. The proposed approach is verified by theoretical analysis, dynamic simulation testing, and field operation to ensure that the obtained distance protection is reliable and refrains from operating unnecessarily under reverse fault-induced CT saturation in the breaker-and-ahalf configuration. Meanwhile, the proposed approach is demonstrated can operate reliably when forward faults occur or various reverse faults are converted to forward faults.