Abstract:Optical ZCT (Zero-phase Current Transformer) which combines a optical magnetic field sensor with a magnetic ring core of silicon steel plates has been developed. Bi-doped YIG (Yttrium Iron Garnet, (BiYbGd)3Fe5O12) having a large verdet constant is used as a Faraday element. Optical ZCT detects the conductor current of 0 to 2,000 A at high resolution and has been applied to the fault section detection system for 66 kV underground branch transmission lines which monitors a multi-terminal line having Y-branch joi… Show more
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