摘要
为了判断变压器绕组松动缺陷及进行缺陷定位,通过分析变压器不同位置处的振动信号变化情况,提出基于ANSYS Workbench的绕组松动缺陷诊断方法。将绘制的模型导入Workbench中进行模态分析,并与实验结果进行对比,验证模型的正确性。通过对模型施加正弦的加速度来进行谐响应分析,并根据绕组各相的顶部轴向和正面径向的振动信号变化设定松动阈值。对变压器进行绕组松动实验,利用基频分量占总分量的比例值相比于额定预紧力下的比例值的变化率来判断绕组松动相,可初步进行绕组松动缺陷定位。结果表明,试验变压器的C相绕组顶部的基频分量变化率大于顶部阈值0.78,且正面变化率大于正面阈值0.44,从而说明C相绕组出现严重松动。而正常相的顶部和正面的基频分量变化率都要小于各位置处的松动阈值,其中远离松动相的绕组的变化率小于0.03,因此该方法可以进行绕组松动缺陷定位。
For the purpose of judging the transformer winding looseness and locating the fault, we propose a diagnosis method based on ANSYS Workbench by analyzing the changes of vibration signals at different positions of transformer. The model is introduced into Workbench so that the modal analysis can be carried out.The results are compared with the experimental results to verify the correctness of the model. Sinusoidal acceleration is applied on the model to carry out the harmonic response analysis. According to the changes of vibration signals collected on the top and at the from of each phase, the looseness threshold can be set. In the experiment, the winding looseness can be preliminary located by using the variance ratio of the specific value. The proportion of fundamental frequency component to the total component is compared with the ratio under the rated pre-compression to determine the loose phase. It is founded that the variation of fundamental frequency component of C phase at the top of test transformer is greater than the top threshold 0.78, and the variation at the front is greater than 0.44, which means the C phase is seriously loose. The variance ratios on the top and at the front of normal phases are less than the thresholds at each position, in which the variation of winding far away from the loose phase is less than 0.03. Therefore, the method can locate the defect of winding looseness.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第1期192-199,共8页
High Voltage Engineering
基金
江苏省电力公司重点科技项目资助(J2014055)~~
关键词
绕组松动
缺陷定位
有限元
模态分析
谐响应分析
振动信号
松动阈值
winding looseness
defect location
finite element
modal analysis
harmonic response analysis
vibrationsignal
looseness threshold
