Slot potential based stator grounding fault location method for large generator

被引：0

作者：

Qiao J. ^{[1
]}

Yin X. ^{[1
]}

Wang Y. ^{[1
]}

Tan L. ^{[1
]}

Xu W. ^{[1
]}

Li W. ^{[2
]}

机构：

[1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan

[2] Pumped-Storage Technological & Economic Research Institute of State Grid Xinyuan Company Ltd., Beijing

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2022年 / 42卷 / 11期

关键词：

electric fault location; large generator; stator grounding fault; winding potential distribution;

D O I：

10.16081/j.epae.202204003

中图分类号：

学科分类号：

摘要：

The current stator grounding fault location methods for large generators often take the coil poten⁃ tial as the analysis unit，and there are theoretical errors for the short-distance winding generators. Therefore，a slot potential based stator grounding fault location method for large generator is proposed. Firstly，based on the winding connection sequence，the analytical expression of stator winding potential distribution is estab⁃ lished with slot potential as unit. Then，different fault location schemes are adopted for whether the generator is equipped with injection stator grounding protection. If the injection stator grounding protection is equipped，the fault evaluation index is constructed based on the measured transition resistance of the injec⁃ tion equipment. If the injection stator grounding protection is not equipped，the third harmonic measurement value is used to construct the fault evaluation index without transition resistance. Finally，multiple virtual reference points are artificially set in the fault phase. Combined with the winding potential distribution，the fault evaluation index of each virtual reference point is calculated. The virtual reference point with the smallest calculation value is regarded as the fault location，and the slot number of the fault is determined. A quasi distributed parameter simulation model is built in PSCAD to verify the effectiveness of the pro⁃ posed method. © 2022 Electric Power Automation Equipment Press. All rights reserved.

引用

页码：204 / 210and217

共 23 条

[1] JAAFARI K A, TOLIYAT H A., Performance analysis of synchronous generators under stator windings ground faults near the star point-experimental verification［J］, IEEE Transactions on Energy Conversion, 35, 3, pp. 1402-1410, (2020)
[2] WU A Y., MV generator ground fault arcing power damage assessment［J］, IEEE Transactions on Industry Applications, 54, 1, pp. 912-915, (2018)
[3] Nengling TAI, STENZEL J., Differential protection based on zero-sequence voltages for generator stator ground fault ［J］, IEEE Transactions on Power Delivery, 22, 1, pp. 116-121, (2007)
[4] AL JAAFARI K，, NEGAHDARI A, TOLIYAT H A, Et al., Modeling and experimental verification of a 100 % stator ground fault protection based on adaptive third-harmonic differential voltage scheme for synchronous generators［J］, IEEE Transactions on Industry Applications, 53, 4, pp. 3379-3386, (2017)
[5] CHEN Jun, LIU Zihong, WANG Mingxi, Et al., Location method for stator single-phase ground fault independent of injection type principle［J］, Automation of Electric Power Systems, 37, 4, pp. 104-107, (2013)
[6] FRIEDEMANN D F，, MOTTER D, OLIVEIRA R A., Stator-ground fault location method based on third-harmonic measures in high-impedance grounded generators［J］, IEEE Transactions on Power Delivery, 36, 2, pp. 794-802, (2021)
[7] BLANQUEZ F R, REBOLLO E, Et al., Online stator ground-fault location method for synchronous generators based on 100% stator low-frequency injection protection ［J］, Electric Power Systems Research, 125, pp. 34-44, (2015)
[8] LIN Cheng, WANG Yuanyuan, ZENG Xiangjun, Et al., Stator single phase ground fault protection of powerformers based on grading insulation［J］, Proceedings of the CSEE, 38, 23, pp. 7052-7060, (2018)
[9] Yuxue WANG, Xianggen YIN, Zhe ZHANG, The fault-current-based protection scheme and location algorithm for stator ground fault of a large generator［J］, IEEE Transactions on Energy Conversion, 28, 4, pp. 871-879, (2013)
[10] YIN Linpeng, Lin GUI, ZHANG Qixue, Et al., Stator grounding fault location method based on distribution characteristics of fundamental wave potential ［J］, Electric Power Automation Equipment, 39, 7, pp. 141-146, (2019)

← 1 2 3 →