振动频响法与传统频响法在变压器绕组变形检测中的比较

Comparative Research on Behavior of Vibration Frequency Response Analysis and Frequency Response Analysis in Detection of Transformer Winding Deformation

首先详细介绍了振动频响法(vibration frequency response analysis,VFRA)检测原理,并与传统频响法(frequency response analysis,FRA)进行了对比。然后对一台220 kV变压器绕组进行了多种人工故障设定,并利用振动频响法与传统频响法对所设故障进行对比检测分析。试验结果表明,振动频响法相比传统频响法对绕组预紧力下降、垫块脱落、幅向轻微变形等故障具有更高的检测灵敏度。

To seek a more accurate method to judge the mechanical condition of transformer windings,firstly,the detection principle of vibration frequency response analysis（VFRA） are presented in detail and compared with that of frequency response analysis（FRA）.By means of setting multi man-made faults to a 220kV power transformer,comparative detection of transformer winding deformation caused by these man-made faults is performed by VERA and FRA respectively.Testing results show that for such faults as decrease of pre-tightening force applied to the winding,pad lost and slight winding deformation in radial direction VFRA possesses higher detection sensitivity than RFA.