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Answer Posted / kj
If due to age or exposure to moisture have caused the
insulation to be lower than normal it can be fixed in most
cases.
The process is to use a solvent which does not harm the
varnish to wash the windings of all dirt. Next bake the
windings in an oven to dry out any moisture. Next
revarnicsh the windings.
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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
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