PSNet,
Here's a reference to an article that might be of interest...
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IEEE Transactions on Dielectrics and Electrical Insulation Vol. 7 No. 6,
December 2000
A Quantative Approach to Estimate the Life Expectancy of Motor Insulation
Systems
by Hashem Oraee
Sharif University of Technology Iran
ABSTRACT
Electric motors represent the largest single load in most power systems.
With continuing increase in nonlinear loads, the effects of harmonic
contents of power systems on various components is becoming more important.
This paper is concerned with the effect of power system harmonics and
voltage unbalance on the useful life of electric motors. A simple equivalent
circuit is used to calculate the additional heat losses caused by supply
distortions. A lumped parameter thermal network is proposed to calculate the
resulting heat distribution within the machine. An Arrhenius chart is then
used to estimate motor insulation remaining life. The proposed approach is
used to determine the effect of supply harmonics and voltage unbalance on
the useful life of a three-phase induction motor and the results are
verified experimentally.
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As at other times, I am not a library nor can I provide copies. Get
your
copy from your local technical library.
br, Pete
Peter E Perkins, PE
Principal Product Safety Consultant
Tigard, ORe 97281-3427
503/452-1201 fone/fax
p.perk...@ieee.org
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