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Development of optical ZCT and its application to fault section detection for 66‐kV underground branch transmission lines
Author(s) -
Toya Atsushi,
Muraoka Keiichi,
Inoue Nobukazu,
Ando Kenichi
Publication year - 1993
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391130805
Subject(s) - electric power transmission , rogowski coil , verdet constant , optics , optical fiber , optical power , transmission line , transformer , electrical engineering , electromagnetic coil , physics , materials science , faraday effect , magnetic field , engineering , voltage , laser , quantum mechanics
The optical ZCT (Zero‐phase Current Transformer) which combines an optical magnetic field sensor with a magnetic ring core of silicon steel plates has been developed. Bi‐doped YIG [Yttrium Iron Garnet, (BiYbGd) 3 Fe 5 o 12 ] having a large Verdet constant is used as a Faraday element. The optical ZCT detects the conductor current of 0 to 2000 A at high resolution and has been applied to the fault section detection system for 66‐kV underground branch transmission lines which monitors a multiterminal line having Y‐branch joint box in on‐line state. Optical ZCTs and a section detector/indicator are connected with optical fibers which are capable of nonrepeatedly transmitting signals over 6 km, and allow monitoring long‐distance underground power transmission lines. A developed system is now operating on the JR Kasai line (Shinkawa pump line) of Tokyo Electric Power Company.