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

Ying Zhu, Yuping Li, Jianbin Sang, Minglei Bao and Haixiang Zang
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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

Energies, 2018, vol. 11, issue 6, 1-15

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.

Keywords: adaptive coefficient; fixed coefficient; third harmonic voltage; stator ground protection; sensitivity; differential; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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