Answer Posted / raja

In India IS specifications are followed which has BS
standard as base.
Normally AC 50 V - 1000V volts are considered LT .
1kV to 66 kV is considered HT and
Above 66 kV is EHT
Voltages below 50 volts is considered Extra low tension

State norton’s theorem?

1172

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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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