정전용량⁕

\[C=\frac{0.02413\epsilon_r}{log_{10}\frac{R}{r}}[\mu F/km]\cdot\cdot\cdot단심\] \[C=\frac{0.0556\epsilon_r\times N}{G}[\mu F/km]\cdot\cdot\cdot다심 \] \[N:심선수, G:형상계수\] \[일반적인 값의 범위 0.3-1.7[/mu F/km]\]

\[E=\frac{\rho_l}{2\pi\epsilon\rho}[V/m]\cdot\cdot\cdot Gauss법칙\] \[V_{rR}=-\int^r_R\vec{E}\cdot\vec{dp}=\frac{\rho_l}{2\pi\epsilon}ln\frac{R}{r}[V]\cdot\cdot\cdot 전위차\] \[C=\frac{Q}{V_{rR}}=\frac{2\pi\epsilon\times L}{ln\frac{R}{r}}[F]\to C=\frac{2\pi\epsilon}{ln\frac{R}{r}}[F/m]=\frac{0.02413\epsilon_r}{log_{10}\frac{R}{r}}[\mu F/km]\]

\[C=\frac{0.02413}{log_{10}\frac{2h}{r}}[\mu F/km]\]

\[C=\frac{0.02413}{log_{10}\frac{2h}{r_e}}[\mu F/km]\]

\[C=C_s+3C_m=\frac{0.02413}{log_{10}\frac{D}{r}}[\mu F/km]\]

\[C=C_s+3C_m=\frac{0.02413\epsilon_r}{log_{10}\frac{D}{r}}[\mu F/km]\] \[\to D감소, \epsilon_r 증가로\ \]\[가공선로에\ 비해\ 약 30배 정도\ 정전용량 증가\]