201 / 2018-09-13 13:43:44

Research on the effect of different connection test methods on frequency response of transformer windings

Transformer winding,Frequency response,Test method,Winding deformation

Different test methods of connecting wire have great influence on frequency response of transformer windings. In order to research the influence of different test methods, the experimental system is established, and the characteristics of winding frequency response under proposed test methods in existing standards are compared and analyzed through experiments. The following conclusions are drawn for the test transformer: During the test process, whether the untested winding ports are shorted will result in obvious deviation on the frequency response of the test winding, and different test methods affect different frequency bands. The frequency response curves of the test winding in the frequency range below 100 kHz and in the frequency range around 1 MHz are obviously affected by whether the untested winding ports are shorted. Injection port has obvious influence on inter-winding frequency response measurement. For this transformer, the major change will appear above 100 kHz. This method has certain superiority for fault diagnosis, such as the diagnosis for radial deformation and the judgment of faulty windings.