2.31. Open – circuit and short-circuit tests are performed on a 10-kVA, 220 – V/110-V, 60-Hz…

2.31.                                Open-circuit and short-circuit tests are performed on a 10-kVA, 220-V/110-V, 60-Hz transformer . Both tests are performed with instrumentation on the high-voltage side, and the following data are obtained:


open-circuit test: input power, 500 W; input voltage, 220 V; input current, 3.16 A short-circuit test:  input power, 400 W; input voltage, 65 V; input current,  10 A

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Determine. the parameters  of the  approximate  equivalent circuit referred  to the (a) primary  and  (b)


X2   (b)  RC = 24.2 n,xm = 25 n,R2 + (R,la2) = 1 n,X 2 + (X/a2)  = 1.28 n



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