组合式变压器直流电阻测量结果不确定度及影响因素分析

Uncertainty and Influencing Factors Analysis of DC Resistance Measurement Results for Combined transformers

近年来,组合式变压器在电力系统中得到广泛应用,而直流电阻测量作为评估组合式变压器性能的重要方法之一,其结果的准确性和可靠性对电力系统的运行和维护具有重要意义。基于此,首先介绍了组合式变压器的工作原理和直流电阻测量的基本原理,然后根据不确定度的定义和计算方法,对组合式变压器直流电阻测量结果的不确定度进行了分析和计算。实验部分详细描述了试验装置的选取和搭建、样品的准备及实验操作步骤。随后,通过实验数据的测量和记录,计算了直流电阻测量结果的不确定度,并对影响因素进行了深入分析,包括温度、电流波动、电压波动、测量仪器精度和样品尺寸误差。最终,总结出不确定度的主要来源和影响程度,并提出相应的改进措施和进一步研究的方向。

In recent years,combination transformers have been widely used in power systems,and DC resistance measurement is one of the important methods to evaluate the performance of combination transformers.The accuracy and reliability of its results are of great significance for the operation and maintenance of power systems.Based on this,the working principle of the combination transformer and the basic principle of DC resistance measurement are first introduced.Then,according to the definition and calculation method of uncertainty,the uncertainty of the DC resistance measurement results of the combination transformer is analyzed and calculated.The experimental section provides a detailed description of the selection and construction of the experimental device,sample preparation,and experimental operation steps.Subsequently,by measuring and recording experimental data,the uncertainty of the DC resistance measurement results was calculated,and the influencing factors were analyzed in depth,including temperature,current fluctuation,voltage fluctuation,measurement instrument accuracy,and sample size error.Finally,summarize the main sources and degree of uncertainty,and propose corresponding improvement measures and further research directions.