Higher efficiency: There is little loss of excitation due
to introduction of superconducting winding. The loss
is about 10% as that of conventional ones in including
power of refrigeration. Mechanical loss, iron loss and
copper loss reduced due to lighter weight and smaller
size. Then the total loss is about 40% as that of conventional one. The efficiency is higher of 0.3–1.0 point
than that of conventional one. This value looks like
smaller. However, by use of conversion formula from
running cost to capital cost. It is about 40% of capital
cost for generator of about 600 MV A. This means that
critical cost is 1.4 times of conventional one