| 摘要 |
<p>A programmable timeswitch comprises a microcontroller and a switching relay for controlling the supply of electricity to electrical apparatus in accordance with a predetermined 'yearly' program stored in an EPROM. The yearly program can include different daily programs for weekdays and weekends and includes different seasonal programs to take account of different demands for electricity at different times of the year. The timeswitch is programmed to switch automatically from one seasonal program to the next seasonal program on predetermined dates in the year and so does not have to be re-programmed at intervals throughout the year. The timeswitch may be used as part of a 'deferable load program' run by a utility in which a large number of timeswitches are supplied to different installations, the timeswitches having been programmed by a master console under the sole control of the utility.</p> |
