典型供电方式	示意图	算法公式
单环网
双环网		${\begin{cases} T_{i} = f_{d} f_{d} f_{d} f_{d} T_{d} + \frac{L}{N} f_{m} f_{f k} (\frac{L}{N} f_{m} f_{f k} (T_{m} + T_{f})) + f_{k} T_{k}; (i = 1) \\ T_{i} = \frac{L}{N} f_{m} f_{f k} (\frac{L}{N} f_{m} f_{f k} (T_{m} + T_{f})) + f_{k} T_{k}; (N > i > 1) \\ T_{i} = \frac{L}{N} f_{m} f_{f k} (\frac{L}{N} f_{m} f_{f k} (T_{m} + T_{f})) + 0.5 f_{k} T_{k}; (i = N) \end{cases}$