Fault section detection system for 66 kV underground branchtransmission lines using optical magnetic field sensors |
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Authors: | Katsuta G Muraoka K Inoue N Sakai S Tsunekage T Ando K |
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Affiliation: | Tokyo Electr. Power Co. Inc.; |
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Abstract: | A fault section detection system that uses optical magnetic field sensors and instantly detects the section in which a ground fault occurred was developed for 66 kV underground multiterminal systems having Y-branch joint boxes. The optical magnetic field sensor, which is based on the Faraday effect in Bi-doped YIG ((BiYbGd)3Fe5O12) having a large Verdet constant, detects cable conductor currents of 0 to 2000 A with high precision with the use of a laminated magnetic ring core of silicon steel plates. Sensors and a fault section detector/indicator of a system are connected with optical fibers capable of nonrepeated transmission of over 6 km |
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