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Abstract
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Article Information:
Comparative Analysis of the Insulation Resistance of Some Nigerian Wood Species with Imported Class B Insulating Materials
A.M.O. Obiazi
Corresponding Author: OBIAZI Adagbonyin Moses
Submitted:
Accepted:
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Abstract:
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Ambient temperatures in tropical countries across the equatorial belt are adversely high. Thus the
operating temperatures of electrical machines in these countries are uncomfortably high even when the
machines operate at rated load. Nigeria as a tropical and developing country has had to contend with this
unfavorable thermal condition for electrical machines. Most of the drive motors in N igeria are imported and
many of them come with class B insulation. In this paper, eight sample varieties of Nigerian wood species-
Mahogany, Obeche, Iroko, Afara, Danta, Opepe, Abeza, and Aper and the two m ost commonly imported class
B insulating materials- Fiber glass and Leatheroid are experimented with to com pare their ability to maintain
insulation integrity at higher temperatures. Impregnated samples of the eight wood species and samples of
leatheroid and fiberglass were subjected to a heat-run in a sealed industrial oven. The insulation resistance of
each sample was measured at regular temperature intervals until the sample burns out. Tables show the values
of weight, insulation resistance, and temperature. The results show that at the class B limiting temperature of
130ºC, Leatheroid had an insulation resistance of 6MΩ while that of fiberglass was 8MΩ . The eight wood samples had insulation resistance above 30MΩ . At the higher temperature of 150ºC, the insulation resistances
of Leatheroid and Fiber glass collapsed to 1MΩ and 1.4MΩ respectively while that of the wood species was a minimum of 15MΩ . At a much elevated temperature of 170ºC, both Leatheroid and Fiber glass were burnt
but the insulation resistances of the eight wood species were up to 8MΩ . Thus, the wood species exhibited
higher insulation integrity at higher temperatures than Leatheroid and Fiberglass. These wood species through
some careful chemical synthesis could be made more malleable and consequently serve as alternative and
cheaper machine insulating materials to the imported Leatheroid and Fiberglass.
Key words: Insulation, class B, temperature, wood, fiberglass, leatheroid, impregnation
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Cite this Reference:
A.M.O. Obiazi, . Comparative Analysis of the Insulation Resistance of Some Nigerian Wood Species with Imported Class B Insulating Materials. Research Journal of Applied Sciences, Engineering and Technology, (3): Page No: 94-97.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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