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Online measurement method of transformer leakage impedance by using symmetrical coupling auxiliary winding

机译：对称耦合辅助绕组在线测量变压器泄漏阻抗的方法

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The transformer can be illuminated by the T-type equivalent circuit model. The primary and secondary leakage impedance characterizes the copper losses and the exciting impedance reflects iron-core losses. The iron-core losses and the copper losses can be obtained by open-circuit and short-circuit test. However, the copper losses of the primary winding and the secondary winding cannot be separated, which cannot satisfy the requirement of the cooling design of the high power transformer. The auxiliary winding method to measure the winding ac resistance of planar transformer in high-frequency switching converters is used in Reference [1], but the detailed arrangement of the auxiliary winding is not analyzed. In this paper, an inductance-coupling model of the transformer is established, and the measurement error is analyzed. Then a Symmetrical Coupling Auxiliary Winding Measurement Method (SCAWM) is proposed. The measurement accuracy of the proposed method is verified by the experiment results based on a five-winding transformer. The online copper loss during nominal medium frequency operation condition is carried out based on the above method, which achieves the separating measurement of the primary and secondary winding AC resistance.
机译：变压器可以由T型等效电路模型照亮。初级和次级泄漏阻抗表征了铜损，而励磁阻抗反映了铁芯损耗。铁芯损耗和铜损耗可通过开路和短路测试获得。但是，一次绕组和二次绕组的铜损不能分开，不能满足大功率变压器冷却设计的要求。在参考文献[1]中使用了辅助绕组方法来测量高频开关变换器中的平面变压器的绕组交流电阻，但是没有分析辅助绕组的详细布置。建立了变压器的电感耦合模型，并分析了测量误差。然后提出了一种对称耦合辅助绕组测量方法（SCAWM）。基于五绕组变压器的实验结果验证了该方法的测量精度。基于上述方法进行标称中频工作条件下的在线铜损，实现了一次绕组和二次绕组交流电阻的分离测量。

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