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| Polarity test method for differential protection current transformers of autotransformers based on short circuit current rising test of hydro generators |
| WANG Ping, YANG Ling, DENG Wentao, SUN Zhijian |
| SDIC Yunnan Dachaoshan Hydropower Co., Ltd, Kunming 650213 |
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Abstract Polarity verification of current transformers is a key step to ensure the normal operation of differential protection for newly commissioned or modified transformers. Considering the limitations of traditional methods, including incomplete circuit verification, high equipment costs, complex testing procedures, and higher safety risks, this paper proposes a new polarity verification method suitable for hydropower stations. This method makes full use of existing equipment of the hydropower station, conducting short circuit current-rising tests through the turbine generator and transformer to generate through currents in order to verify the correctness of the polarity of current transformers on each side of the busbar differential protection. This paper details the implementation plan of this method, analyzes and calculates the key aspects of the testing process, and establishes comprehensive safety control measures. Comparison of test data with theoretical calculations shows that this method can effectively and reliably verify the polarity of current circuits. Compared with traditional methods, this method has significant advantages such as higher safety, lower cost, no need for additional testing equipment, and wider applicability, providing reference for the polarity verification of current transformers in hydropower and pumped-storage power stations.
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Received: 09 September 2025
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| Cite this article: |
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WANG Ping,YANG Ling,DENG Wentao等. Polarity test method for differential protection current transformers of autotransformers based on short circuit current rising test of hydro generators[J]. Electrical Engineering, 2026, 27(5): 71-79.
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| URL: |
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https://dqjs.cesmedia.cn/EN/Y2026/V27/I5/71
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[1] 高瑞君, 彭越, 王声学, 等. 大型变压器一次通流试验方法的研究与应用[J]. 中国设备工程, 2023(增刊2): 50-53.
[2] 张凯, 王明涛. AP1000核电站厂用中压母线CT极性校验方法[J]. 电气技术, 2014, 15(1): 68-70.
[3] 洪晓彤, 刘海静. 直流法测量极性组别原理及与向量图的关系探究[J]. 电力安全技术, 2024, 26(10): 41-45.
[4] 段章超, 孙绍武. 水轮发电机组短路升流和零起升压试验[J]. 水电站机电技术, 2018, 41(10): 10-13, 20.
[5] 楚皓翔, 宋宇, 李涵. 500kV变压器纵差保护试验方法[J]. 电气技术, 2022, 23(3): 87-91.
[6] 牛利涛, 马晨原, 张钢, 等. 发电厂差动保护极性校验的难点和关键点分析[J]. 电工技术, 2019(17): 133-135.
[7] 张富超, 杨红霞, 芮建勋, 等. 500 kV自耦变压器套管电流互感器极性校核方法研究[J]. 山东电力技术, 2021, 48(10): 48-53.
[8] 谢广健. 探讨解决穿越性大电流冲击导致主变重瓦斯保护误动作的方法[J]. 新技术新工艺, 2015(12): 125-127.
[9] 俞纪维, 董纲, 宋晓斌, 等. 主变空载合闸励磁涌流的分析与探讨[J]. 电气技术, 2016, 17(5): 131-133.
[10] 汤蕴璆. 电机学[M]. 5版. 北京: 机械工业出版社, 2014.
[11] 于航, 郑瑜, 蒋炯锋, 等. 500kV自耦变压器分相差动保护低压绕组电流互感器接线研究[J]. 电气技术, 2023, 24(2): 77-81.
[12] 马新惠. 电力系统短路电流暂态解析法计算及其软件开发[D]. 长沙: 长沙理工大学, 2011. |
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2026, Vol. 27 
