Quantitative analysis of insulation condition of oil-paper insulation based on frequency domain spectroscopy
- 12 February 2015
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Dielectrics and Electrical Insulation
- Vol. 22 (1), 322-334
- https://doi.org/10.1109/tdei.2014.004490
Abstract
In order to distinguish the influences of moisture and aging on the frequency domain dielectric response of oil-paper insulation and better apply frequency domain spectroscopy (FDS) to assess the insulation condition of power transformers, the oil-paper insulation samples with different moisture contents and different aging states were prepared in the laboratory. The FDS of the samples were tested and a group of characteristic parameters were extracted from dissipation factor (tanδ) curves which could be used to assess the moisture content and aging states of oil-paper insulation respectively. The quantitative relationship among characteristic parameters, degree of polymerization (DP) and moisture contents (Km.c) was accurately established. The observations show that the proposed characteristic parameters are sensitive to the moisture in 10-3-102Hz, while the aging states influence the characteristic parameters in 10-3-10-1Hz. Meanwhile, an exponential relationship equation which could be used to assess the oil-paper insulation condition was established among the characteristic parameters, DP and the moisture content. Finally, the evaluation technique proposed in this paper was used to diagnose the insulation condition of several field transformers in this way, and its validity was preliminary and reasonably verified.Keywords
This publication has 37 references indexed in Scilit:
- On the Feasibility of Using Poles Computed from Frequency Domain Spectroscopy to Assess Oil Impregnated Paper Insulation ConditionsEnergies, 2013
- Characterization of aging transformer oil-pressboard insulation using some modern diagnostic techniquesEuropean Transactions on Electrical Power, 2010
- A comparative study of thermal aging of transformer insulation paper impregnated in natural ester and in mineral oilEuropean Transactions on Electrical Power, 2009
- Frequency Response of Oil Impregnated Pressboard and Paper Samples for Estimating Moisture in Transformer InsulationIEEE Transactions on Power Delivery, 2006
- Field Experiences With Measurements of Dielectric Response in Frequency Domain for Power Transformer DiagnosticsIEEE Transactions on Power Delivery, 2006
- The Influence of Levelling-off Degree of Polymerisation on the Kinetics of Cellulose DegradationCellulose, 2005
- Investigation of polarization and depolarization current measurements for the assessment of oil-paper insulation of aged transformersIEEE Transactions on Dielectrics and Electrical Insulation, 2004
- Review of modern diagnostic techniques for assessing insulation condition in aged transformersIEEE Transactions on Dielectrics and Electrical Insulation, 2003
- Experience with return voltage measurements for assessing insulation conditions in service-aged transformersIEEE Transactions on Power Delivery, 2003
- Life assessment of cable paper using slow thermal ramp methodsThermochimica Acta, 1999