The Transactions of the Korean Institute of Electrical Engineers P (전기학회논문지P)

The Korean Institute of Electrical Engineers (대한전기학회)
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Digital Negative Sequence Relay Algorithm for Detection of Unbalanced State in a Generator

발전기의 불평형 검출을 위한 디지털 역상 계전 알고리즘

  • 박철원 (강릉원주대학교 전기공학과)
  • Received : 2013.11.11
  • Accepted : 2013.11.26
  • Published : 2013.12.01
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Abstract

There are conditions that can be unbalanced three phase currents in a large generator by untransposed lines, unbalanced loads, unsymmetrical faults, and open phases. The unbalanced conditions can producing negative sequence components of current that induce two times frequence current in the surface of the rotor, the retaining rings, the slot wedges in the field windings. These rotor currents make the rotor rapidly overheat, so the rotor can cause substantial damage in a very short time. This paper presents the digital negative sequence relay algorithm for unbalanced protection in a generator. The proposed algorithm was tested by using collected current signals on PSCAD/EMTDC considering a hydro turbine based generator control system. It can be seen that the proposed relaying by negative sequence current is useful for detection of unbalanced state of large generator.

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References

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