A 2300/230 V step down transformer is rated at 70 kVA and 60 Hz. Its windings have the following resistances and inductances : Rp 0.093 ohms, Xp0.280 ohms, Rs 0.00093 ohms and Xs 0.00280 ohms. The transformer's rated current at the secondary is 3261 A. Assume that a10 from 2300/230 V and calculate the no load voltage for unity 0.7 lagging and 0.7 leading power factor.
You question does not make sense. First issue: You want to calculate the no load voltage? At the secondary? But you specify a power factor? The only possible interpretation that can be drawn from a specification of power factor is that the transformer is under load. Second issue: You specific primary and secondary winding resistance and inductance. The problem is to calculate open circuit (no load) secondary voltage. But the specification says nothing about the core. If the transformer is open circuited, there is no secondary current, and therefore no voltage drop in the secondary winding resistance and reactance. And the specification says nothing about the core, the one must presume that there is no core loss. In the absence of core loss, and at no load, then there is no primary current, and therefore no voltage drop in the primary winding resistance and reactance. Third issue: what do you mean by a 10?
this is quite a typical question. there will be many examples similar to it
