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A Special Protection Scheme Against a Local Low-Voltage Problem and Zone 3 Protection in the KEPCO System
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 Title & Authors
A Special Protection Scheme Against a Local Low-Voltage Problem and Zone 3 Protection in the KEPCO System
Yun, Ki-Seob; Lee, Byong-Jun; Song, Hwa-Chang;
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This paper presents a special protection scheme, which was established in the KEPCO (Korea Electric Power Corporation) system, against a critically low voltage profile in a part of the system after a double-circuit tower outage. Without establishing the scheme, the outage triggers the operation of a zone 3 relay and trips the component. This sequence of events possibly leads to a blackout of the local system. The scheme consists of an inter-substation communication network using PITR (Protective Integrated Transmitter and Receiver) for acquisition of the substations` data, and under-voltage load shedding devices. This paper describes the procedure for determining the load shedding in the scheme and the experiences of the implementation.
KEPCO system;Local blackout;Low-voltage problem;Special protection scheme;Zone 3 protection;
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