Thyristor Controlled Ground Fault Current Limiting Systemfor Ungrounded Power Distribution Systems

IEEE Transactions on Power Delivery, Vol. 11, No. 2, pp.940-945, April 1996

A thyristor controlled ground fault current limiting system (TGCL) was proposed to preventone-line ground fault current rises due to increased capacitance to ground. Basic componentsof the TGCL are a main ground fault current limiter, which rapidly adjusts a compensatingreactor level for the capacitance to ground, and the TGCL's controller. Control is ensuredby an in-phase control method for zero-phase sequence voltage and current. The methoddetermines the direction of ground faults and the compensating reactor level. The fastcontrol which can be realized shows the TGCL is a valuable protecting system for highground fault current distribution systems.


Shigeyuki Sugimoto (Chubu Electric Power Co., Inc.)
Sadanori Neo (Chubu Electric Power Co., Inc.)
Hiroshi Arita (Power & Industrial Systems R & D Division, Hitachi Ltd.)
Junzou Kida (Power & Industrial Systems R & D Division, Hitachi Ltd.)
Yoshiaki Matsui (Kokubu Works, Hitachi Ltd.)
Tokio Yamagiwa (Kokubu Works, Hitachi Ltd.)

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