A novel criterion for fast protection of transformer based on Hausdorff distance and double threshold

被引：0
|
作者：
Wu Z. [1 ,2 ]
Zeng G. [1 ,2 ]
Li Y. [1 ,2 ]
Wang F. [1 ,2 ]
Tu Q. [1 ,2 ]
Yang Y. [1 ,2 ]
Zhao Q. [3 ]
机构：
[1] Electric Power Dispatching Control Center of Guangdong Power Grid Co., Ltd., Guangzhou
[2] Key Laboratory for Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Co., Ltd., Guangzhou
[3] Nari-relay Engineering and Technique Co., Ltd., Nanjing
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2019年 / 47卷 / 18期
基金：
中国国家自然科学基金;
关键词：
CT saturation; Double setting threshold; Hausdorff distance; Interturn fault; Similarity recognition for waveform; Transformer;
D O I：
10.19783/j.cnki.pspc.190327
中图分类号：
学科分类号：
摘要：
Traditional transformer differential protection generally uses Fourier transform to calculate fundamental component. It cannot identify low percentage interturn faults inside the transformer. And the operating time is usually more than half a cycle affected by the length of data window. What’s more, the protection may operate by mistake when there is an external fault accompanied by CT saturation. In order to solve the above problems, a new criterion for transformer protection based on Hausdorff distance is proposed in this paper. The similarity of current waveforms on both sides of the transformer is compared to distinguish the internal faults from external ones quickly. Theoretical analysis shows that the length of the data window can be selected arbitrarily in new criteria, which is conducive to improving the protection action speed. At the same time, the double setting threshold ensures not only the rapid tripping speed in the case of severe faults, but also the correct operation of protection when an external fault occurs accompanied with CT saturation. Finally, the validity of criteria is verified based on PSCAD/EMTDC. The simulation results show that the criteria can operate quickly and the action time can be as short as 5.5 ms. And the protection can operate in one cycle after fault even if the percentage of interturn fault is only 0.5%. Besides, it has strong anti-CT saturation performance. © 2019, Power System Protection and Control Press. All right reserved.
引用
收藏
页码：128 / 135
页数：7
相关论文
共 16 条
  • [1] Zhang X., Zheng Y., Kang X., Et al., Several problems of intelligent substation relay protection system, Power System Protection and Control, 46, 6, pp. 90-96, (2018)
  • [2] Bengtsson C., Status and trends in transformer monitoring, IEEE 1995 Powertech Conference Proceedings, pp. 1379-1384, (1995)
  • [3] Wang N., Wang H., Liu B., Analysis of interturn short circuit fault in 35 kV transformer, Transformer, 50, 10, pp. 60-64, (2013)
  • [4] Shen X., Shu Z., Liu Y., Et al., Operation situation of protective relayings of State Grid Corporation of China in 2007, Power System Technology, 32, 16, pp. 5-8, (2008)
  • [5] Zhao Q., Shi J., Failure analysis on false-actions of differential protection main transformer for CT saturation, Qinghai Electric Power, 28, pp. 62-65, (2009)
  • [6] Jin R., Bao B., Shi B., Research on three kinds of percentage restraint methods and their coefficient setting of transformer differential protection, Power System Protection and Control, 46, 19, pp. 81-87, (2018)
  • [7] Yang L., Sun J., Liu W., Et al., Transformer inter-turn short circuit modeling and its application, Power System Protection and Control, 42, 8, pp. 140-145, (2014)
  • [8] Xiong X., Wang Q., Chen X., A protection method of transformer inter-turn short circuit based on the variation of current ratio, Power System Protection and Control, 41, 9, pp. 112-115, (2013)
  • [9] Olivares-Galvan J.C., Escarela-Perez R., Gonzalez J.A.A., Et al., Detection of interturn faults during transformer energization using wavelet transform, IEEE International Autumn Meeting on Power, pp. 178-182, (2017)
  • [10] Zhu S., Transformer protection for low percentage interturn faults, Electric Power Automation Equipment, 19, 1, pp. 25-29, (1999)
12