NDLI: Measurements on pressboard to understand the effect of solid insulation condition on monitoring of power transformer winding clamping pressure

Content Provider	IET Digital Library
Author	Naranpanawe, Lakshitha Ekanayake, Chandima Saha, Tapan Kumar
Abstract	Pressboard is the main building material of a power transformer winding structure. Through-thickness compression behaviour of pressboard has a direct influence on the transformer winding clamping pressure. Being a cellulose based polymeric material with a porous structure, the through-thickness compression behaviour of pressboard is highly non-linear. Also, the mechanical properties of pressboard are moisture, temperature, and ageing status dependent. However, information on the exact behaviour of the through-thickness compressibility of pressboard under typical operating conditions of a power transformer has not been well documented in the literature. This has posed difficulties in developing reliable techniques to detect loose clamping conditions in power transformer windings. This study presents the results of laboratory measurements on the effect of moisture, temperature and ageing on the through-thickness compression behaviour of oil-impregnated pressboard. From the measured results, it was found that the compressibility of pressboard could increase with increasing temperature, ageing and moisture ingress. It was also found that moisture and ageing tend to exaggerate the thermal softening of pressboard. Subsequent finite element analysis confirmed that transformer clamping pressure has significantly altered with the pressboard condition.
Starting Page	186
Ending Page	192
Page Count	7
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 2, Mar (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5096
Journal	IET Science, Measurement & Technology
Publisher Date	2018-10-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Ageing Engineering Material Finite Element Analysis Loose Clamping Condition Moisture Moisture Ingress Numerical Analysis Oil-impregnated Pressboard Power Transformer Power Transformer Insulation Power Transformer Testing Power Transformer Winding Structure Power Transformer Windings Pressboard Condition Through-thickness Compressibility Through-thickness Compression Behaviour Transformer And Reactors Transformer Clamping Pressure Transformer Oil Transformer Windings
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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