| 摘要 |
A time switch (14) that is resistant to voltage failure in the supply network (12) is to be equipped in an operationally reliable fashion so as to avoid the typical fault phenomena after a relatively long standby operation of power reserve storage devices and the relatively high costs for the storage device elements. The invention dispenses entirely with any power reserve on the basis of the realisation that during the time interval when a network (12) has failed the load (11) cannot be operated in any case, so that in this interval it is not necessary to operate the time switch (14) correctly with respect to time. Instead of this, the time switch (14) is operated with a storage device (16) for the switching instants that is resistant to network failure, and together with a radio clock (17), which, when the network (12) is once again available, determines the real time, and corrects the control state of the time switch (14) to said time. <IMAGE> |
