光学电流传感器在电网接地故障零序电流检测中的应用  

Application of Optical Current Transducer in Power Grid Grounding Fault Zero Sequence Current Testing

作　　者：邱洪顺[1] 唐平[2] 王倩倩[2] 

机构地区：[1]江苏大学后勤管理处,江苏镇江212013 [2]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电工电气》2012年第4期29-32,41,共5页Electrotechnics Electric

摘　　要：针对中压配电网故障难以选线和定位,提出开发基于法拉第磁光效应原理的零序光学电流传感器(ZOCT)来检测零序电流,分析了光学电流传感器替代普通电磁式电流互感器(CT)在温度稳定性、宽线性量程、灵敏度等优势,设计了组合型与全光纤型2种形式的光学电流传感器结构。该传感器采用钇铁石榴石(YIG)类材料,提高费尔德常数及温度稳定性,光强检测采用双路检测方式以提高性能。传感器安装在变电所出线和线路馈线终端设备(FTU)处,根据在故障点两侧光学电流传感器(OCT)测得的电流方向相反,在全线路上逐级递减,进行正确故障选线与定段。Aiming at the difficulty of selecting and positioning medium-voltage power distribution network fault line, this paper raised to develop zero sequence optical current transducer （ZOCT） based on the principle of Faraday magneto-optical effect to test zero sequence cur- rent, analyzing the replacement of normal magnetic current transformer （CT） with optical current transducer in temperature stability, wide linear measurement range, sensitivity etc advantages, and designing the optical current transducer structure of combination type and fully optical fiber. The transducers adopted YIG kind material to raise Verdet constant and temperature stability, with adoption of double-route test method to raise performance. Transducers were installed at substation out-line and line feed-back end equipment locations, and then correct fault line selection and section positioning were carried out according to the currents tested in opposite direction by optical current transducers （OCT） at both ends of fault point and the principle of degression by slow degree.

关 键 词：光学电流传感器 小电流故障 故障选线与定段 零序电流 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TM862[自动化与计算机技术—控制科学与工程]