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Understanding Frequency & Time Domain Polarisation Methods for the Insulation Condition Assessment of Power Transformers

Saha, T.K. and Middleton, R. and Thomas, A. (2009) Understanding Frequency & Time Domain Polarisation Methods for the Insulation Condition Assessment of Power Transformers. In: IEEE Power & Energy Society General Meeting, 2009. PES '09. 26-30 July 2009. IEEE, pp. 1-8. ISBN 978-1-4244-4241-6

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Abstract

APreventive 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.

Item Type: Book Section
Additional Information: ©2009 IEEE. Reprinted from IEEE Power & Energy Society General Meeting, 2009. PES '09. 26-30 July 2009. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5275851
Keywords: Ageing and Moisture Analysis; Dielectric Response; Dissipation Factor; Insulation Model Nomenclature; Oil/paper Insulation; Polarisation Depolarisation Current; Return Voltage; Transformer Condition Monitoring; Hamilton Institute.
Subjects: Science & Engineering > Electronic Engineering
Science & Engineering > Hamilton Institute
Item ID: 1873
Identification Number: 10.1109/PES.2009.5275851
Depositing User: Hamilton Editor
Date Deposited: 01 Mar 2010 18:17
Journal or Publication Title: IEEE Power & Energy Society General Meeting, 2009. PES '09.
Publisher: IEEE
Refereed: Yes
URI:

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