Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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A Special Protection Scheme Against a Local Low-Voltage Problem and Zone 3 Protection in the KEPCO System

  • Yun, Ki-Seob (South Seoul Power Transmission Center, Korea Electric Power Corporation) ;
  • Lee, Byong-Jun (Advanced Power Systems Research Center(APSRC), Korea University) ;
  • Song, Hwa-Chang (School of Electronic and Information Engineering, Kunsan National University)
  • Published : 2007.09.01
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Abstract

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.

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References

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