Abstract: An improved electrically actuated detonator for use in oil well perforation guns is described wherein a hermetically sealed donor explosive propels a plate through a barrel cavity into a vented open space to initiate an acceptor explosive. If the open space fills with liquid the detonator fails to operate. The detonator is also resistant to actuation by radio-frequency and electrostatic energy.

Abstract: A combined cycle electric power plant includes gas and steam turbines and steam generators and a digital/analog control system. In the control system, an automatic digital computer control generates position setpoints for the gas turbine fuel valves and the steam turbine inlet valves to control speed and load. A synchronizer system includes a sequencer which is largely embodied in the digital computer as an element of the automatic control and it further includes a synchronizer which is external to the automatic control. The sequencer connects the synchronizer to synchronize the three generators in a sequence which depends on the startup and loading operation of the turbines, the synchronization operation of the synchronizer and the operation of the breakers. Turbine speed changes are initiated by the speed/load control under synchronizer control.