NDLI: Understanding and analysis on frequency dielectric parameter for quantitative diagnosis of moisture content in paper

Content Provider	IET Digital Library
Author	Liao, Ruijin Liu, Jiefeng Yang, Lijun Gao, Jun Zhang, Yiyi Lv, Yan Dong Zheng, Hanbo
Abstract	The ageing rate of cellulose insulation materials (paper/pressboard) in oil-impregnated transformers is largely determined by moisture. In this paper, several experiments were conducted under controlled laboratory conditions to quantitatively diagnose the amount of moisture in cellulose insulation using frequency domain spectroscopy (FDS) technique, which has been proven to be an effective tool to predict the insulation condition in oil-impregnated power equipment. The frequency dielectric response in oil-impregnated pressboards, moisture content as well as test temperature, was monitored carefully, and a new dielectric characteristic parameter for the diagnosis of moisture content was proposed. In addition, the master curve technique was introduced to calibrate the temperature effect on FDS measurement results. These experiments revealed that a strong correlation exists between frequency dielectric parameter and moisture content in cellulose insulation. Such correlation can be utilised for better prediction of moisture content in paper–oil insulation. A modified assessment method for the diagnosis of moisture content in paper–oil insulation was investigated and its effectiveness was also demonstrated using a case.
Starting Page	213
Ending Page	222
Page Count	10
ISSN	17518660
Volume Number	9
e-ISSN	17518679
Issue Number	Issue 3, Mar (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/9/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2014.0101
Journal	IET Electric Power Applications
Publisher Date	2015-03-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Ageing Rate Cellulose Insulation Materials Controlled Laboratory Condition Dielectric Characteristic Parameter FDS Measurement FDS Technique Frequency Dielectric Parameter Frequency Dielectric Response Frequency Domain Analysis Frequency Domain Spectroscopy Technique Inductors And Transformer Insulation Condition Prediction Master Curve Technique Moisture Content Moisture Content Diagnosis Moisture Content Prediction Oil-impregnated Power Equipment Oil-impregnated Pressboards Oil-impregnated Transformer Organic Insulation Paper Paper-oil Insulation System Pressboard Quantitative Diagnosis Spectroscopy Test Temperature Transformer And Reactors Transformer Oil
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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