| 引用本文: | 翁汉琍,梅瀚予,郭祎达,贾永波,李振兴,黄景光.基于差流符号序列特征的变压器励磁涌流识别判据[J].电力自动化设备,2022,42(6): |
| WENG Hanli,MEI Hanyu,GUO Yida,JIA Yongbo,LI Zhenxing,HUANG Jingguang.Identification criterion of transformer magnetizing inrush current based on symbol sequence characteristic of differential current[J].Electric Power Automation Equipment,2022,42(6): |
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| 基于差流符号序列特征的变压器励磁涌流识别判据 |
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翁汉琍1,2, 梅瀚予1,2, 郭祎达1,2, 贾永波3, 李振兴1,2, 黄景光1,2
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1.三峡大学 梯级水电站运行与控制湖北省重点实验室，湖北 宜昌 443002;2.三峡大学 电气与新能源学院，湖北 宜昌 443002;3.国网河南省电力公司信阳供电公司，河南 信阳 464000
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| 摘要: |
| 变压器在空载合闸的过程中，会产生幅值较大的励磁涌流，如不采取相应的闭锁措施，将导致变压器差动保护误动作。针对该问题，提出了一种基于差流符号序列特征的变压器励磁涌流识别判据。该判据首先对差流序列进行符号化处理，根据符号序列中相关模式序列出现的比例，量化表征差流波形的特征，实现对励磁涌流和故障差流的识别。利用PSCAD/EMTDC仿真软件验证了所提判据在各类区内外故障和励磁涌流工况下，以及各类工况伴随电流互感器饱和时的有效性。 |
| 关键词: 变压器差动保护 继电保护 励磁涌流 差流 符号序列 电流互感器饱和 |
| DOI：10.16081/j.epae.202203004 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金资助项目(52077120) |
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| Identification criterion of transformer magnetizing inrush current based on symbol sequence characteristic of differential current |
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WENG Hanli1,2, MEI Hanyu1,2, GUO Yida1,2, JIA Yongbo3, LI Zhenxing1,2, HUANG Jingguang1,2
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1.Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang 443002, China;2.College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China;3.Xinyang Power Supply Company of State Grid Henan Electric Power Company, Xinyang 464000, China
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| Abstract: |
| In the process of no-load closing of transformer, the magnetizing inrush current with large amplitude will be generated. If the corresponding locking measures are not taken, the transformer differential protection will be misoperated. In order to solve this problem, an identification criterion of transformer magnetizing inrush current based on the symbol sequence characteristics of differential current is proposed. This criterion firstly symbolizes the sequence of differential current, and then quantifies the characteristics of differential current waveform according to the proportion of correlation pattern sequence in the symbol sequence, so as to realize the identification of magnetizing inrush current and the differential fault current. PSCAD/EMTDC simulation software is used to verify the validity of the proposed criteria under various types of in-area and out-of-area faults and magnetizing inrush current conditions, as well as various types of conditions accompanied by current transformer saturation. |
| Key words: transformer differential protection relay protection magnetizing inrush current differential current symbol sequence current transformer saturation |
