Quantitative aging assessment method for cellulose pressboard based on the interpretation of the dielectric response mechanism
- 1 May 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Cellulose
- Vol. 27 (8), 4773-4785
- https://doi.org/10.1007/s10570-020-03102-z
Abstract
Cellulose pressboard is used as a key element in various power equipment insulation structures and determines the operational safety of electric equipment and power systems. This paper aims to increase the application of a pressboard aging assessment method based on frequency domain spectroscopy, a promising nondestructive method for power equipment diagnosis, through in-depth theoretical analysis and accurate data fitting. To achieve this purpose, first, based on classic theoretical models in the field of dielectric physics, a mathematical deduction is proposed to separate each dielectric process in the overlapping frequency band. Second, a novel analysis approach that considers both the pressboard dielectric response and the thermally stimulated current is proposed and demonstrated to be effective in determining the physical meaning of pressboard microscopic dielectric processes. Third, a function model based on a specific microscopic mechanism is established to fit the frequency domain spectra of pressboard samples with different aging degrees. Based on this approach, the variations in charge carrier motion characteristics in the frequency domain with increasing pressboard aging degree are clarified. Moreover, the function model provides characteristic parameters that are clearly related to the degree of polymerization of the material, which represents a quantitative method for evaluating the aging degree of cellulose pressboard by indirectly obtaining its frequency response curve. Graphic abstractKeywords
Funding Information
- National Natural Science Foundation of China (51507130, 51777157)
- National Key Research and Development Program of China (2017YFB0902705)
- program of China Scholarships Council (201906280079)
This publication has 29 references indexed in Scilit:
- Effect of oil–paper–pressboard mass ratio on furfural content in transformer oilIEEE Transactions on Dielectrics and Electrical Insulation, 2019
- Reducing frequency domain spectroscopy measurement time for condition monitoring of transformer oil‐paper insulation using non‐sinusoidal excitationsIET Science, Measurement & Technology, 2017
- Analysis of frequency domain dielectric response of pressboard insulation impregnated with different insulating liquidsIEEE Transactions on Dielectrics and Electrical Insulation, 2016
- Explanation and analysis of oil-paper insulation based on frequency-domain dielectric spectroscopyIEEE Transactions on Dielectrics and Electrical Insulation, 2015
- Condition assessment of cellulosic part in power transformer insulation using transfer function zero of modified debye modelIEEE Transactions on Dielectrics and Electrical Insulation, 2014
- Charge transport in thermally aged paper impregnated with natural ester oilIEEE Transactions on Dielectrics and Electrical Insulation, 2014
- On the Time-Domain Response of Havriliak-Negami DielectricsIEEE Transactions on Antennas and Propagation, 2013
- Frequency Response of Oil Impregnated Pressboard and Paper Samples for Estimating Moisture in Transformer InsulationIEEE Transactions on Power Delivery, 2006
- Molecular interpretation of the main relaxations found in dielectric spectra of cellulose – experimental argumentsCellulose, 2004
- The random free-energy barrier model for ac conduction in disordered solidsJournal of Applied Physics, 1988