| 摘要 |
A mains distribution network has a hierarchic structure simplifying the work for installing it. From a central at a fuse box (11), only one line extends that is successively at nodes (13.1.1, 13.1.1, 13.3.1, 13.4.1) divided in branching lines. At nodes and endpoints (13.2.2, 13.4.2) remotely controllable elements are provided including actuator units and measuring units. The controllable elements can receive values of the maximum current allowed to pass in the line in which the respective controllable element is connected, and they can, by operating the actuator unit, disconnect the power supply through the line if required. The controllable elements can be interconnected to form a data network such as a local area network. In the data network signals can be transmitted on lines of the mains network. The local intelligence provided by the controllable elements gives an enhanced safety against overheating and an increased safety for persons since electric outlet boxes do not have to carry any electric voltage until a connection to a power requiring device is made. |
