| 引用本文: | 尹项根,曹文斌,潘远林,等.高阻抗电力变压器涌流特性及其对保护影响的研究[J].电力系统保护与控制,2018,46(20):1-11. |
| YIN Xianggen,CAO Wenbin,PAN Yuanlin,et al.Inrush current characteristic of high-impedance transformers and its impact on protective relays[J].Power System Protection and Control,2018,46(20):1-11 |
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| 摘要: |
| 高阻抗变压器以其限制短路电流的优势已得到广泛应用。其中高压绕组内置型高阻抗变压器涌流问题将比普通变压器更为突出。近几年，电网中多次出现这类变压器投运时邻近设备的后备保护误动事件。从绕组结构入手，明确了变压器磁通分布和等值电路参数的对应关系。根据变压器零模涌流解析表达式和几种变压器自互漏感参数的差异，指出内置变涌流幅值更大衰减更快的特征并得到了仿真的验证，揭示了零模涌流导致保护误动的原因。对后续改进仿真和试验的平台、深化研究的方向进行了展望。 |
| 关键词: 高阻抗变压器 高压绕组内置型 低压绕组串抗型 涌流 后备保护 |
| DOI：10.7667/PSPC181169 |
| 分类号: |
| 基金项目:国家重点研发计划资助(2016YFB0900600);广东电网有限责任公司科技项目资助(GDKJXM20162461) |
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| Inrush current characteristic of high-impedance transformers and its impact on protective relays |
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YIN Xianggen1,CAO Wenbin1,PAN Yuanlin1,WANG Yuxue2,GUO Qian1,2,LIU Wei2
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(1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. Electric Power Dispatching Control Center of Guangdong Power Grid Co., Ltd., Guangzhou 510600, China)
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| Abstract: |
| High-impedance transformers have been widely used for their advantages of limiting short-circuit current. The inrush current problem of the high-voltage built-in high-impedance transformer (T-Hin) will be more prominent than the traditional transformer. In recent years, there have been many misoperations of the backup protection of the transformer and its adjacent equipment. From the perspective of the winding structure, the correspondence between the magnetic flux distribution and the parameters of the transformer equivalent circuit is clarified. According to the analytical expression of zero-mode inrush current and the difference of the leakage inductance parameters of several transformers, it is pointed out that the T-Hin inrush current amplitude is larger and attenuation is slower, which is verified by simulation. The causes of protection misoperation caused by zero-mode inrush current are obtained. And the future improvement of simulation and experimental platforms, and the direction of deepening research are prospected. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900600) and Science and Technology Project of Guangdong Power Grid Co., Ltd. (No. GDKJXM20162461). |
| Key words: high-impedance power transformers high-voltage winding built-in low-voltage winding series reactance inrush current backup protection |
