Δ(Delta) – Y Conversion

把Δ形電路變換成Y形電路

R_{y}={\frac {R'R''}{\sum R_{\Delta }}}

RΔ是Δ形電路的阻抗之和。具體公式如下：

R_{1}={\frac {R_{a}R_{b}}{R_{a}+R_{b}+R_{c}}}

R_{2}={\frac {R_{b}R_{c}}{R_{a}+R_{b}+R_{c}}}

R_{3}={\frac {R_{a}R_{c}}{R_{a}+R_{b}+R_{c}}}

把Y形電路變換成Δ形電路

R_{\Delta }={\frac {R_{P}}{R_{{\mathrm {opposite}}}}}

具體公式如下：

R_{a}={\frac {R_{1}R_{2}+R_{2}R_{3}+R_{3}R_{1}}{R_{2}}}

R_{b}={\frac {R_{1}R_{2}+R_{2}R_{3}+R_{3}R_{1}}{R_{3}}}

R_{c}={\frac {R_{1}R_{2}+R_{2}R_{3}+R_{3}R_{1}}{R_{1}}}