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Abstract
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Article Information:
Determination of the Insulation Classification of Some Nigerian Paper Products
A.M.O. Obiazi
Corresponding Author: OBIAZI Adagbonyin Moses
Submitted: 2009 May, 20
Accepted: 2009 July, 15
Published: |
Abstract:
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Empirical studies have shown that over 30% of electrical machine failures result from insulation
failure. The temperature-rise which electrical machines may safely withstand is determined by the limiting
temperature of the insulating material used in them. This paper presents the experimental results of a research
to qualify some paper insulating materials thermally by determining their insulation class. Ten sample varieties
of Nigerian paper products were experimented with to determine their insulation classification. The samples
were cut into definite dim ensions and weighed. Each paper product was made into two samples; one sample
was left in its ordinary state while the other sample was impregnated with insulating varnish. Both samples
were subjected to a heat-run in a sealed industrial oven, while measuring the insulation resistance of the given
sample at regular temperature intervals until the sample burns out. The measured values of weight, insulation
resistance and temperature are shown in tables. Curves were plotted to show the variation of insulation
resistance with temperature. From the experiments, seven of the paper products require impregnation to be
suitable for class Y insulation, whose maximum permissible tem perature is 90ºC. The other three paper
products are unsuitable for class Y insulation even when impregnated.
Key words: Paper products, limiting temperature, insulation class, samples, impregnation, resistance,
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Cite this Reference:
A.M.O. Obiazi, . Determination of the Insulation Classification of Some Nigerian Paper Products. Research Journal of Applied Sciences, Engineering and Technology, (3): Page No: 81-84.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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