H - Electricity – 02 – H
Patent
H - Electricity
02
H
317/7
H02H 7/04 (2006.01) H02H 3/44 (2006.01)
Patent
CA 1283161
ABSTRACT OF THE DISCLOSURE In a transformer protection system, data of voltages and currents detected at individual terminals of a transformer connected to an electric power system are supplied to a computer. The computer computes driving point admittances or shunt admittances of the transformer on the basis of the voltage and current data and prede- termined transfer admittances of the transformer and decides that an internal fault has occurred in the trans- former when the values of the driving point admittances or shunt admittances deviate from pre-set reference values, thereby disconnecting the transformer from the electric power system.
520283
Inagaki Keizo
Kudo Hiroyuki
Matsuzawa Kunio
Oura Yoshifumi
Sano Yoshihiro
Hitachi Ltd.
Kirby Eades Gale Baker
Tokyo Electric Power Co. Inc. (the)
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