Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection
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 dec...
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Online Access: | http://www.mdpi.com/1996-1073/11/6/1430 |
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doaj-6ba0e689738d4d19836d5b9d870e46d92020-11-25T01:22:37ZengMDPI AGEnergies1996-10732018-06-01116143010.3390/en11061430en11061430Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding ProtectionYing Zhu0Yuping Li1Jianbin Sang2Minglei Bao3Haixiang Zang4College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, ChinaNanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, ChinaNanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, ChinaNanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, ChinaCollege of Energy and Electrical Engineering, Hohai University, Nanjing 211100, ChinaThis 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.http://www.mdpi.com/1996-1073/11/6/1430adaptive coefficientfixed coefficientthird harmonic voltagestator ground protectionsensitivitydifferentialsimulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ying Zhu Yuping Li Jianbin Sang Minglei Bao Haixiang Zang |
spellingShingle |
Ying Zhu Yuping Li Jianbin Sang Minglei Bao Haixiang Zang Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection Energies adaptive coefficient fixed coefficient third harmonic voltage stator ground protection sensitivity differential simulation |
author_facet |
Ying Zhu Yuping Li Jianbin Sang Minglei Bao Haixiang Zang |
author_sort |
Ying Zhu |
title |
Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection |
title_short |
Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection |
title_full |
Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection |
title_fullStr |
Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection |
title_full_unstemmed |
Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection |
title_sort |
analysis and improvement of adaptive coefficient third harmonic voltage differential stator grounding protection |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2018-06-01 |
description |
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. |
topic |
adaptive coefficient fixed coefficient third harmonic voltage stator ground protection sensitivity differential simulation |
url |
http://www.mdpi.com/1996-1073/11/6/1430 |
work_keys_str_mv |
AT yingzhu analysisandimprovementofadaptivecoefficientthirdharmonicvoltagedifferentialstatorgroundingprotection AT yupingli analysisandimprovementofadaptivecoefficientthirdharmonicvoltagedifferentialstatorgroundingprotection AT jianbinsang analysisandimprovementofadaptivecoefficientthirdharmonicvoltagedifferentialstatorgroundingprotection AT mingleibao analysisandimprovementofadaptivecoefficientthirdharmonicvoltagedifferentialstatorgroundingprotection AT haixiangzang analysisandimprovementofadaptivecoefficientthirdharmonicvoltagedifferentialstatorgroundingprotection |
_version_ |
1725126298050756608 |