In this article, a new testing method for the diagnosis of winding faults based on the resonant frequency of the transformer is proposed. The system that consists of the high-voltage dc power and high-voltage insulated gate bipolar transistor (IGBT) could charge the transformer periodically. The response measured from the bushing of the winding is the oscillating wave that can be used for evaluating the status. Carrying out the new test on a 220-kV three-winding, three-phase transformer in the field, the tests of insulation and the winding have been completed in one test. The calculated frequency verifies the feasibility and applicability of the method in theory and the voltage does not affect the resonant frequency in the test. The three-winding, three-phase model transformer was built to simulate the various parameters of the power supply, which proves that the features of the oscillating waves are brought about by the properties of the transformer. Also, the new testing method provides a new opportunity to do parameter identification of axial displacement and short-circuit (SC) fault. The abovementioned research shows that the proposed method can conduct the test of winding and insulation in one test for a short time, which proves a reference in the field.

中文翻译：

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变压器绕组故障诊断的一种新测试方法

本文提出了一种基于变压器谐振频率诊断绕组故障的新测试方法。由高压直流电源和高压绝缘栅双极晶体管（IGBT）组成的系统可以对变压器进行周期性充电。从绕组的套管测量的响应是可用于评估状态的振荡波。在现场对一台220kV三绕组三相变压器进行新试验，绝缘试验和绕组试验一次完成。计算出的频率从理论上验证了该方法的可行性和适用性，测试中电压不影响谐振频率。三绕组三相模型变压器用于模拟电源的各种参数，这证明了振荡波的特性是由变压器的特性带来的。此外，新的测试方法为轴向位移和短路 (SC) 故障的参数识别提供了新的机会。上述研究表明，所提出的方法可以在短时间内进行绕组和绝缘的一次测试，在该领域具有参考价值。