基于FDS的变压器油浸纸老化程度与水分含量评估方法  

FDS- based assessment of aging degree and moisture content for oil- paper in transformer

作　　者：黎成林[1] 曹保江[1] 孙健翔[1] 雷帆[1] 吴广宁[1] 高波[1] LI Chenglin CAO Baojiang SUN Jianxiang LEI Fan WU Guangning GAO Bo(College of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电力自动化设备》2017年第1期217-223,共7页Electric Power Automation Equipment

摘　　要：搭建了频域介电谱(FDS)技术测试试验平台,测试了不同老化程度和不同水分含量油浸纸样品的复介电常数,并对测试结果进行对比分析。分析结果表明:绝缘纸聚合度的降低使油浸纸样品的复介电常数实部和虚部在低频段增大,而在高频段基本不变;绝缘纸水分含量的增加使油浸纸样品的复介电常数实部在10~2 Hz以下的频域范围内增大,虚部在整个测试频域范围内增大,且虚部曲线随水分含量的增大呈现向右平移趋势。提出利用复介电常数虚部的等效下降幅度作为绝缘纸聚合度映射特征量,以此评估油浸纸的老化状态。拟合出特征频率10^(-4) Hz处复介电常数实部与水分含量的关系式,以此提出一种适用于不同老化程度和油浸纸水分含量的频域介电特征量评估方法。A test platform is established based on the FDS（Frequency domain Dielectric Spectroscopy）,the complex permittivity of oil-paper samples with different aging degrees and moisture contents are measured and the results are contrastively analyzed, which show that, the decrease of DP（Degree of Polymerization） of oil-paper makes the real and imaginary parts of its complex permittivity increased in the low-frequency band while basically unchanged in the high-frequency band ;the increase of moisture content of oil-paper makes the real part of its complex permittivity increased in the frequency domain lower than 10^2 Hz while the imaginary part increased over the whole frequency domain and the imaginary permittivity curve moved rightward in parallel. It is proposed to adopt the equivalent decline extent of imaginary permittivity as the mapping characteristic parameter of DP to assess the aging degree of oil-paper. The formula of relationship between moisture content and real permittivity is fitted at the characteristic frequency of 10^-4 Hz for assessing the permittivity of oil-papers with different aging degrees and moisture contents.

关 键 词：变压器 油纸绝缘 材料老化 FDS 聚合度 水分 等效下降幅度 

分 类 号：TM41[电气工程—电器]