First, take P out of the numerator and denominator: P/P = 1. Then you are left with 1 / (1+R), where R is the ratio including the cosine. Then multiply by 1 = (1-R)/(1-R). After expanding this, you are left with (1-R)/(1-R^2). Here is assumed that R is small and R^2 is almost nihil. Then the denominator becomes 1 and you are left this result: 3:24. I just described the simplification. Remember, etha is a number smaller than 1. Sir is a bit hasty in his lectures ;-)
Sir,from ur point of view receiving end must be 10kv,20kv,30kv,60kv,130kv,200kv .Then why did not taken 40kv, 50kv like this. My question is particularly why did taken these ratings And i require information about kv rating with respect to distance & load KVA for each kv rating based on approx empirical formula in table form.
Sir , here when you are taking 'W'' as constant , then volume is inversely proportional to square root of voltage.. but sir ' W ' is also depends upon V , then how we can maintain it as constant .
@@lecturesinelectricaleng sir , here W is power loss in line , and in its relationship it directly proportional to current density and inversely to Voltage , current decreases with increasing voltage . for constant W current density must be proportional to Voltage, so I think we can not take current density as constant...
