The load ability, or the limiting current loading of a power
transformer is a complex function of many variables, the
thermal properties of the cooling fluid, the winding losses,
the iron loss, the dynamic ambient temperature, among
others. Based the earlier work of the author 1 [5,6], easily
applicable general empirical relations connecting the
limiting load, L(in pu) and the consequent Top Oil
Temperature (TOT) above the ambient (ea), !leT has been
suggested herein thus: