110kV变压器绝缘电阻测量多点接地模型及绝缘特性改变对绝缘电阻影响
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摘要
针对现场变压器铁芯、外壳接地特点提出变压器多点接地模型,与扩展Debye模型对比验证了所提模型可用于变压器绝缘电阻仿真测试与分析。基于Matlab可视化Simulink动态仿真环境,分析了各极化支路电参数变化对绝缘电阻的影响。结果表明,时间常数不变的情况下大时间常数支路对极化过程影响最大,反之则取决于极化支路电参数变化幅度。
According to the grounding characteristics of core and shell of field transformer, a multi-point grounding model of transformer is proposed. compared with the extended Debye model, the proposed model can be used to simulate, test and analyze the insulation resistance of transformer. Based on the Matlab visual Simulink dynamic simulation environment, the influence of the electrical parameters of each polarization branch on the insulation resistance is analyzed. The results show that when the time constant is constant, the large time constant branch has the greatest influence on the polarization process, on the contrary, it depends on the variation range of the electrical parameters of the polarization branch.
According to the grounding characteristics of core and shell of field transformer, a multi-point grounding model of transformer is proposed. compared with the extended Debye model, the proposed model can be used to simulate, test and analyze the insulation resistance of transformer. Based on the Matlab visual Simulink dynamic simulation environment, the influence of the electrical parameters of each polarization branch on the insulation resistance is analyzed. The results show that when the time constant is constant, the large time constant branch has the greatest influence on the polarization process, on the contrary, it depends on the variation range of the electrical parameters of the polarization branch.
引文
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[2]凌钢.浅析电气设备绝缘电阻测量技术[J].仪器仪表与检测技术,2018(9):49-50.
[3]刘廷敏.电力变压器的绝缘电阻测量与分析研究[J].电子测试,2017(14):7-9.
[4]邢志宏,豆河伟,李宝华.110kV变压器试验数据异常分析方法的探讨[J].变压器,2018(11):74-77
[5]林智勇,张达敏,仲训杲,等.基于老化因子的变压器绝缘状态分析[J].山东大学学报(工学版),2019(2):114-119.
[6]王丽,董明,王健一,等.电力变压器频域介电谱特性仿真模型的对比研究[J].绝缘材料,2018,51(9):76-81.
[7]林智勇,蔡金锭.变压器等效电路参数变化对极化谱的影响分析[J].电子测量与仪器学报,2014,28(3):292-298.
[8]Tapan K.Saha,Prithwiraj Purkait,Frank Müller.Deriving an Equivalent Circuit of Transformers Insulation for Understanding the Dielectric Response Measurements[J].IEEE Transactions On Power Delivery,2005,20(1):149-157.
[9]张军强.基于极化去极化电流检测的油纸绝缘状态研究[D].华北电力大学,2013.