Abstract: Protective relay apparatus for electric power systems which logically relates the outputs of two algorithms to provide the fastest possible trip for the conditions of the post-fault voltage and current waveforms.

Abstract: An elevator system, and method of operating same, including a plurality of elevator cars mounted in a building to serve the floors therein. A system processor, having instructions stored in a memory, responds to predetermined system information to provide output signals for controlling the movement of the elevator cars. Predetermined lobby functions, such as quota control of elevator cars at the floor and dispatching therefrom, are provided by the instructions for a floor identified in the instructions. The floor for which such lobby functions are performed is changed in response to predetermined conditions, to any selected floor of the building, by means which changes the number of the identified floor in the associated instructions.

Abstract: A new and improved elevator system, and method of directing a plurality of elevator cars to serve floor calls in an elevator system. Service is provided for floor calls which cannot be allocated to a suitably conditioned car already busy serving calls, by specifically assigning non-busy or available cars to serve such calls. The floor calls are each timed from registration and when their registration time reaches a first value the strategy for assigning available cars to non-allocated calls is changed. The timing of a call continues following the reaching of the first value, until the call reaches a second timed value. The strategy for assigning available cars to non-allocated calls is changed again, in response to a call registered for the second predetermined period of time.