基于振动的变压器绕组松动诊断方法

Diagnosis Method for Transformer Winding Looseness Based on Vibration

对变压器绕组振动的频率成分进行分析,指出100 Hz振动分量是变压器绕组振动的核心分量,且接近100 Hz的振动分量振幅较大。为避开铁心振动对绕组松动诊断的影响,提出以50 Hz振动分量与150 Hz振动分量的比值为特征量的绕组松动诊断方法。对某110 k V大型变压器进行绕组松动试验,采集其监测点处的振动信号,提取指定频率下的振动分量并计算诊断特征量,试验结果表明在绕组松动前后,50 Hz振动分量与150 Hz振动分量的比值会发生明显变化,可以作为变压器绕组松动的诊断依据。

This paper analyzes frequency components of the transformer winding vibration and points out that 100 Hz vibration component is the core component and amplitudes of vibration components close to 100 Hz are larger. In order to avoid influence of iron core vibration on diagnosis of winding looseness,it proposes a diagnosis method for transformer winding looseness which takes ratio of 50 Hz vibration component and 150 Hz vibration component as the characteristic quantity. Experiment on winding looseness of110 k V large transformer was performed,vibration signals at monitoring points were collected,vibration components of specified frequencies were extracted and diagnosis characteristic quantities were calculated. Experiment results indicate that ratio of 50 Hz vibration component and 150 Hz vibration component changes obviously before and after winding looseness which can be taken as diagnosis basis for transformer winding looseness.