how does oil cools the transformer
Answer Posted / kalaiarasan
by ejecting the heat from transformer
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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.
how we can calculate power factor in single phase & three phase ?thank u
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please send privious years question papers of jindal steel and power ltd.My e mail id is rajanikant.sngh@gmail.com