一起使用频响法对新变压器绕组变形测试的分析

Analysis of Deformation Test of Frequency Response Method to New Transformer Windings

电力变压器绕组变形后,其电感、电容分布参数发生相对变化,变压器绕组变形的测试的方法主要有频响法、阻抗法、低压脉冲法,这几种方法对绕组变形有较好的判断。本文通过对一台新变压器进行绕组变形试验(交接试验),在使用频响法测试过程中,通过同轴屏蔽线不同的接地方式进行测试、不同的仪器进行测试,发现测试结果存在差异,与出厂不一致,这会影响到以后变压器出现故障后检测的判断,因此,新安装变压器在运输过程中是否受到冲击,验证与出厂是否一致十分必要。

After power transformer winding deformatiobn,some apppropriate changes of distributed parameters of its inductance and capacitance will happen.The test methods of the transformer winding deformation are mainly of frequency response method,impedance method and low voltage impulse method.These methods have better judgement to the winding deformation.The winding deformation test to a new tranformer is carried in the paper.In the course of using frequency response method test by different earthing ways of coaxial shielding line carryout test and different instruments carrying out test find out test resuct to have difference,which is not conformity with routine test.This will influence judgement after fawlt test of the transformer,thus wheather a new transformer to be shocked in the during transport will prove it necessary whethe to be conformity with the routine.