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1 某100kVA、3300V/220V單相變壓器作短路試驗時,三個電表讀值各為66V、30.3A、1300W,則銅損及短路功因分別為
A 1300W,0.65
B 1300W,0.45
C 1300W,0.55
D 1300W,0.75

銅損=PSC=1300W

短路功因cosθ= PSCVSC×ISC=130066×30.3=0.65