内蒙古电力技术2015，Vol.33Issue(3)：44-47,4.DOI:10.3969/j.issn.1008-6218.2015.03.023
基于自激法的CVT试验电压计算方法改进分析
Analysis of CVT Testing Voltage Calculating Method Based on Self-excitation
摘要
Abstract
The traditional CVT self-excitation method for measuring capacitance and dielectric loss value does not consider the effect of excitation circuit on current of the experimental windings. Thus the obtained testing voltage is getting lower and the accuracy of the measurement results are affected. An improved calculating method was proposed to get the exact value, which took the mentioned factor into consideration. T-equivalent circuit model of the excitation unit transformer was established based on the quantitative analysis of current through the primary winding when the bridge was balanced. And then KCL of vector was applied to seek the correct expression for current through the testing windings, theoretically proved that the actual current value flowing through the testing windings was exactly smaller than the result calculated by the method that without consideration of excitation circuit. Actual experiment was put into practice and the experimental results showed that the mean of maximum current through the testing winding was 20.69% less than the calculating value which did not take the effect of excitation circuit into consideration. Testing voltage could be improved about 20% compared with the calculating value received through the method without taking the effect of excitation circuit into consideration.关键词
CVT/自激法/励磁回路/基尔霍夫电流定律/试验电压Key words
CVT/self-excitation method/excitation circuit/KCL/testing voltage分类
信息技术与安全科学引用本文复制引用
王飞龙,张慧慧..基于自激法的CVT试验电压计算方法改进分析[J].内蒙古电力技术,2015,33(3):44-47,4.
