考虑直流偏磁的变压器状态分析及量化评价

State Analysis and Quantitative Evaluation of Transformers Considering DC Bias

在中国交直流混联系统的快速发展中,由直流系统运行产生的直流偏磁现象对附近变压器的影响越来越大。为此,提出了考虑直流偏磁影响的变压器状态分析及量化评价方法。首先,从变压器噪声、振动强度和损耗3个方面量化了直流偏磁对变压器状态的影响,并给出了量化表达式;在此基础上,建立了考虑直流偏磁影响的变压器状态量化评价模型,并采用数据拟合法避免人工经验法的主观影响;最后,通过实际案例对比分析,证明了该模型方法能有效量化直流偏磁对变压器状态的影响程度。基于此,可以有效辨别变压器的实际工作状态,提高了运行维护人员工作效率和设备管理效率。

In the rapid development of AC-DC hybrid system in China,the DC bias phenomenon generated by the operation of DC system has an increasing impact on the nearby transformers.For this reason,a transformer state analysis and quantitative evaluation method considering the influence of DC bias is proposed.Firstly,the influence of DC bias on transformer state is quantified from three aspects of transformer noise,vibration intensity and loss,and a quantitative expression is given.On this basis,a quantitative evaluation model of transformer state considering the influence of DC bias is established,and the data fitting method is used to avoid the subjective influence of artificial experience method.Finally,the effectiveness of the proposed model method is proved through the comparative analysis of actual cases,which qualifies the influence of DC bias on the state of transformer.So,the actual working status of transformer can be effectively distinguished,and the working efficiency of operation and maintenance personnel and the equipment management efficiency are improved.