percent usable area

The method consists of two parts: equipment-replacing necessity decision-making,which is used for all equipment in the network to select the ones that should be replaced annually by using the equipment-replacing probability index,aiming at ensurin.

该方法由全网设备的更替需要决策和单台设备的更替方案决策两部分组成:以保证配网可靠供电为目标,运用可能更替百分比指标确定全网需要更替的设备;考虑更替对设备性能的改善,运用设备更替益本比指标确定单台设备的更替方案。