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Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection

Author

Listed:
  • Ying Zhu

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China)

  • Yuping Li

    (Nanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, China)

  • Jianbin Sang

    (Nanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, China)

  • Minglei Bao

    (Nanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, China)

  • Haixiang Zang

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China)

Abstract

This paper presents a novel third harmonic voltage differential stator grounding protection (THV-DSGP) method combining the adaptive coefficient and fixed coefficient. It can solve the protection sensitivity degradation problem when the insulation resistance of stator winding to ground is slowly declining. This protection method retains the advantages of the adaptive coefficient, which is to maintain high sensitivity in case of an instantaneous ground fault. Moreover, the fixed coefficient can remember the initial insulation state of the stator winding and prevent relay failure when the stator insulation is slowly declining. In addition, due to zero-sequence voltage disconnection (ZSVD) often leading to malfunctioning of the THV stator ground protection, the existing criterion of the ZSVD was improved according to the electrical characteristics of the generator when ZSVD happens. THV-DSGP with both adaptive coefficient and fixed coefficient was simulated in the Matlab/Simulink. The simulation results show that the proposed protection can be applied to the slow ground fault of the stator winding. Furthermore, the improved criterion of ZSVD can effectively distinguish the stator metal earth fault and the secondary loop break of the zero-sequence voltage.

Suggested Citation

  • Ying Zhu & Yuping Li & Jianbin Sang & Minglei Bao & Haixiang Zang, 2018. "Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection," Energies, MDPI, vol. 11(6), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1430-:d:150406
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    References listed on IDEAS

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    1. Byung Eun Lee & Jinsik Lee & Sung Ho Won & Byongjun Lee & Peter A. Crossley & Yong Cheol Kang, 2014. "Saturation Detection-Based Blocking Scheme for Transformer Differential Protection," Energies, MDPI, vol. 7(7), pages 1-17, July.
    2. Xu Chen & Xianggen Yin & Bin Yu & Zhe Zhang, 2016. "Communication Channel Reconstruction for Transmission Line Differential Protection: System Arrangement and Routing Protocol," Energies, MDPI, vol. 9(11), pages 1-17, October.
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    Cited by:

    1. Xing Li & Fan Yang & Julan Ming & Ammad Jadoon & Sheng Han, 2018. "Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography," Energies, MDPI, vol. 11(7), pages 1-13, July.
    2. Jingde Xia & Shaozhuo Li & Shuping Gao & Wenquan Shao & Guobing Song & Changjiang Chen, 2021. "Research on Differential Protection of Generator Based on New Braking Mode," Energies, MDPI, vol. 14(7), pages 1-16, March.

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