Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Design and Fabrication of a Digital Protection Relay for Reverse-Open Phase

디지털 역결상 보호 계전기의 설계 및 제작

  • Kim, Woo-Hyun (Department of Electrical and Electronics Enginerring, Korea Maritime and Ocean University) ;
  • Kil, Gyung-Suk (Department of Electrical and Electronics Enginerring, Korea Maritime and Ocean University) ;
  • Kim, Sung-Wook (Power Asset Management Team, Hyosung Corporation)
  • 김우현 (한국해양대학교 전기전자공학과) ;
  • 길경석 (한국해양대학교 전기전자공학과) ;
  • 김성욱 ((주)효성 Power Asset Management팀)
  • Received : 2019.04.09
  • Accepted : 2019.04.19
  • Published : 2019.07.01
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Abstract

Induction motors connected with a three-phase AC system may malfunction due to reverse phase or open phase faults. Conventional overcurrent relays and overheating relays are used to prevent such accidents; however, their drawbacks include a low response speed and false operation. Therefore, in this study, a digital relay for the reverse-open phase was designed and fabricated. This relay can detect the reverse phase and open phase faults and send a trigger signal to the control circuit. The proposed relay was developed based on a microcontroller. The detection times of the reverse phase and open phase were verified as 320ms and 80ms, respectively. Compared with conventional relays that only protect the motor from one type of fault, the proposed relay can detect both, reverse phase and open phase faults. In addition, the fault detection, identification criterion, and trigger signal patterns can be modified by programming according to the requirements of users.

Keywords

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Fig. 1. Structure of a thermal trip device.

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Fig. 2. Structure of a magnetic trip device.

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Fig. 3. Configuration of a conventional digital relay.

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Fig. 4. Configuration of the proposed relay.

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Fig. 5. Voltage monitoring.

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Fig. 6. Circuit of the control circuit.

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Fig. 7. Prototype of the proposed relay.

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Fig. 8. Flow chart for the operation.

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Fig. 9. A motor control sequence and application of the proposed relay.

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Fig. 10. Typical signal in case of a reverse phase.

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Fig. 11. Typical signal in case of an open phase.

Table 1. LED indication by fault types.

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References

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