NDLI: Understanding frequency & time domain polarisation methods for the insulation condition assessment of power transformers

Content Provider	IEEE Xplore Digital Library
Author	Saha, T.K. Middleton, R. Thomas, A.
Copyright Year	2009
Description	Author affiliation: Hamilton Institute, National University of Ireland (Middleton, R.) \|\| School of ITEE, University of Queensland, Brisbane, QLD-4072, Australia (Saha, T.K.; Thomas, A.)
Abstract	Preventive diagnosis and maintenance of transformers has become more and more useful in recent times in order to improve the reliability of electric power systems. Time domain dielectric testing techniques such as Return Voltage (RV) measurement and Polarisation-Depolarisation Current (PDC) measurement have recently been widely used as potential tools for condition assessment of transformer insulation. In the frequency domain, measurement of the dissipation factor (tanδ) over a frequency range of 0.1 mHz to 1 kHz has been commonly used to assess the condition of transformer insulation. A number of transformers have been tested with these diagnostic techniques. A better understanding and analysis of the dielectric test results is only possible with a clear understanding of the physical behaviour of the insulation system in response to moisture and ageing. A circuit model, which describes the dielectric behaviour of the transformer's main insulation system, has been modelled in this paper from the frequency domain measurement data and then RV and PDC data have been simulated from the circuit model. This paper then presents discussions of frequency and time domain techniques to find the condition of transformer insulation in terms of moisture and ageing estimation.
Starting Page	1
Ending Page	8
File Size	3593898
Page Count	8
File Format	PDF
ISBN	9781424442416
ISSN	19449925
DOI	10.1109/PES.2009.5275851
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polarization Power transformer insulation Power transformers Dielectrics and electrical insulation Dielectric measurements Power system reliability Insulation testing Current measurement Time measurement Frequency domain analysis Insulation Model Nomenclature Dielectric Response Polarisation Depolarisation Current Return Voltage Dissipation Factor Oil/paper Insulation Ageing and Moisture Analysis Transformer Condition Monitoring
Content Type	Text
Resource Type	Article

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