\(
\frac{I_2}{I_{2n}} = 0{,}85
\ \Rightarrow\
\frac{I_2}{72} = 0{,}85
\ \Rightarrow\
I_2 = 72 \cdot 0{,}85 = 61{,}2\ \mathrm{A}
\) \(
P_2 = \sqrt{3}\, V_2 I_2 \cos\varphi
= \sqrt{3}\cdot 400 \cdot 61{,}2 \cdot 0{,}8
= 33{,}92\ \text{kW}
\) \(
P_{CU} = \left(\frac{I_2}{I_{2n}}\right)^2 \cdot P_{CC}
= 0{,}85^2 \cdot 1100
\) \(
\eta = \frac{P_2}{P_2 + P_0 + P_{CU}}
= \frac{33920}{33920 + 200 + 0{,}85^2 \cdot 1100}
= 0{,}9715
\)
\frac{I_2}{I_{2n}} = 0{,}85
\ \Rightarrow\
\frac{I_2}{72} = 0{,}85
\ \Rightarrow\
I_2 = 72 \cdot 0{,}85 = 61{,}2\ \mathrm{A}
\) \(
P_2 = \sqrt{3}\, V_2 I_2 \cos\varphi
= \sqrt{3}\cdot 400 \cdot 61{,}2 \cdot 0{,}8
= 33{,}92\ \text{kW}
\) \(
P_{CU} = \left(\frac{I_2}{I_{2n}}\right)^2 \cdot P_{CC}
= 0{,}85^2 \cdot 1100
\) \(
\eta = \frac{P_2}{P_2 + P_0 + P_{CU}}
= \frac{33920}{33920 + 200 + 0{,}85^2 \cdot 1100}
= 0{,}9715
\)