$$n \approx \frac{U_1}{U_{20}}$$ $$P_o \approx P_{fe}$$

$$P_k=P_{cu,1/1}+P_{fe} \cdot (\frac{U_{1k}}{U_{1N}})^2 \approx P_{cu1/1} =I_1^2 \cdot R_1 = I_2^2 \cdot R_2$$ $$\cos (\varphi_k)=\frac{P_k}{U_K * I_{1/1} }$$ $$e_k=\frac{U_k}{U_1}*100\% = \sqrt{r_k^2 + x_k^2}$$ $$e_r=e_k*\cos (\varphi_k)$$ $$e_x=e_k*\sin (\varphi_k)$$ komplekst: $$\overline e_k=\overline r_k + \overline x_k \cdot j=e_k \angle{\varphi_k}$$ effekter: $$P_k \approx P_{cu 1/1}$$

overføring: $$r_1`= \frac{r_1}{n^2} \textrm{ og } x_1`= \frac{x_1}{n^2}$$ $$r_2`= r_2 \cdot n^2 \textrm{ og } x_2`= x_2 \cdot n^2$$ $$R_1=r_1+r_2`=R_2 \cdot n^2 \textrm{ og } X_1=x_1+x_2`=X_2 \cdot n^2 \\ R_2=r_1`+r_2= \frac{R_1}{n^2} \textrm{ og } X_2=x_1`+x_2= \frac{X_1}{n^2}$$

$$I_{1k}=I_{1 1/1} \cdot \frac{100}{e_k}$$ $$I_{2k}=I_{2 1/1} \cdot \frac{100}{e_k}$$

$$m= \frac{I_1}{I_{1 1/1}}= \frac{P_2}{P_{2 nom}}$$ maximale virkningsgrad $$m_{\eta max}=\sqrt{ \frac{P_{fe}}{P_{cu 1/1}}}$$