在分析两种形式的有源网络典型支路的基础上，把无源网络的网孔方程、节点方程、回路方程、割集方程推广为有源网络下的相应方程。

After a analysis of the typical branch of active network, the mesh equation, node equation, loop equation, cut set equation for active network are given.

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但若故障支路形成回路或割集时，则仍需要解一组非线性方程，不过它的变量个数已大大减少。

But if there have some loops or cut sets between these fault branches, solving a set of nonlinear equations is also necessary, though the number of variables is much decreased.

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