三绕组变压器传统T型等效漏感在涌流过程中的适用性分析  

Applicability Analysis of Traditional T-equivalent Leakage Inductance of Three-winding Transformer in Inrush Process

作　　者：曹文斌[1] 尹项根[1] 张哲[1] 潘远林 陈永昕[1] 王育学 CAO Wenbin;YIN Xianggen;ZHANG Zhe;PAN Yuanlin;CHEN Yongxin;WANG Yuxue(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;Power dispatching control center of Guangdong power grid,Guangzhou 510000,Guangdong Province,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [2]广东电网有限责任公司电力调度控制中心,广东省广州市510000

出　　处：《中国电机工程学报》2020年第8期2680-2690,共11页Proceedings of the CSEE

基　　金：国家重点研发计划智能电网与装备重点专项(2016YFB0900600);广东电网有限责任公司科技项目(GDKJXM20162461)。

摘　　要：三绕组变压器无法构建与两绕组变压器类似的具有准确物理意义的T型等效电路。采用微分方程证明三绕组变压器传统T型等效电路的2种推导过程都存在忽略励磁支路和解耦变换的局限性,进而提出基于受控电感的等效电路和准确漏感表达式。指出传统等效漏感与真实准确漏感存在物理概念差异和理论数值误差,揭示中压侧的传统等效漏感为零的本质原因。与基于现场录波的实测准确漏感相比,高压内置型高阻抗变压器的传统等效漏感误差较大,产生的空投零序电流偏差较大,影响保护整定、事故分析及措施改进,会增加误动风险。因此,传统等效参数不适合分析此类涌流问题,建议采用文中所提实际准确参数进行分析计算。The three-winding transformer cannot construct a T-equivalent circuit with accurate physical meaning similar to the two-winding transformer. It was proved by differential equations that the two derivation processes of the traditional T-equivalent circuit for the three-winding transformer have the limitations of neglecting the magnetizing branch and the decoupling transformation. Then the equivalent circuit based on the controlled inductance and the accurate leakage inductance expressions were proposed. It pointed out that there are physical concept differences and theoretical numerical errors between the traditional equivalent leakage inductance and the true accurate leakage inductance. And the phenomenon that the traditional equivalent leakage inductance of the medium-voltage side is close to zero was revealed. Compared with the actual accurate leakage inductance based on the on-site recording, the traditional equivalent leakage inductance of the transformer with high-voltage winding built-in(T-Hin) has a larger error, and the deviation of the generated zero-sequence current is larger, which may affect the protection setting, accident analysis and improvement of measures, and increase the risk of disoperation. Therefore, the traditional equivalent parameters are not suitable for analyzing such inrush current issues. It is recommended to use the actual and accurate parameters mentioned for analysis and calculation.

关 键 词：三绕组变压器 T型等效电路 传统等效漏感 涌流过程 适用性分析 

分 类 号：TM77[电气工程—电力系统及自动化]