Abstract: Choke transformers can be divided into several types according to applicable track circuits and traction currents. This paper discusses the methods for calculating the impedance of BE and BES series choke transformers. Two methods of numerical value selection are presented. Theoretical calculations and comparison show that these two methods affect calculation results in different ways for different types of choke transformers.

Key words: testing methods, choke transformer, theoretical calculation, application analysis

摘要： 提出扼流变压器在伏阻法测试阻抗电路中的两种测试方法，平衡电压法和不平衡电压法。通过理论计算和分析证明，惯性思维中的平衡电压法测试会导致测试结果偏差更大。反之，不平衡电压法得出的测试结果偏差更小，提高测试结果的准确度，颠覆以往的理论认知。并通过分析，得出最佳测试方法。

关键词: 测试方法, 扼流变压器, 理论计算, 应用分析