基于时域介电谱法分析油纸绝缘变压器极化等效电路弛豫支路数  

Analyzing Relaxation Branches of Oil-paper Insulation Polarization Equivalent Circuit of Transformer based on Time Domain Dielectric Spectrum

作　　者：林朝明[1,2] 蔡金锭[1] 

机构地区：[1]福州大学电气工程与自动化学院,福州350108 [2]福建水利电力职业技术学院,福建永安366000

出　　处：《电气技术》2016年第4期20-24,共5页Electrical Engineering

基　　金：国家自然科学基金项目(61174117)

摘　　要：评估变压器油纸绝缘时,无论采用时域方法还是频域方法,都需要先建立变压器的油纸绝缘等效电路。基于电介质极化原理,变压器油纸绝缘等效电路大多采用扩展德拜模型,但往往很难直接确定该模型中弛豫机构的个数。本文提出了一种利用时域介电谱法确定弛豫机构个数的方法,即通过对变压器油纸绝缘去极化电流微分运算,得出时域介电谱,则谱线的峰点个数即为弛豫机构个数,从而建立变压器油纸绝缘扩展德拜等效电路模型。本文详细介绍了时域介电谱的分析方法,并给出了实例验证该方法在确定变压器油纸绝缘等效电路模型中得可行性和合理性。Assessment of transformer oil paper insulation, both time domain method and frequency domain method need to build oil-paper insulation equivalent circuit of transformer. Based on the principle of dielectric polarization, the oil-paper insulation equivalent circuit of transformer is mostly used the extended debye model, but it is always difficult to directly determine the number of the relaxation mechanism in the model. In this paper, the time domain dielectric spectroscopy is used to determine the number of relaxation mechanism, namely the time domain dielectric spectroscopy is gained by the differential operation of depolarization current. It is concluded that the number of peak point of the spectral lines is the number of relaxation mechanism, so as to establish the extended debye equivalent circuit model of oil-paper insulation transformer. This paper introduces the method of time domain dielectric spectroscopy in detail, and gives the examples to demonstrate that the method which is used to determine equivalent circuit model of oil-paper insulation transformer is feasibility and rationality.

关 键 词：时域介电谱 等效电路 电力变压器 油纸绝缘 

分 类 号：TM855[电气工程—高电压与绝缘技术]