In the past many GE gas turbines, including Frame 5, Frame 6 & Frame
7 machines incorporated a Jaw Clutch to engage the gas turbine starting drive.
As well as the disadvantage of requiring a control system and actuators to engage the Jaw Clutch this could only be done when the gas turbine was at rest. This meant that in the event of a failed GT start, the operator must wait until the machine is stationary before trying to re-start.
The SSS Clutch shown in the illustration is replaces the Jaw Clutch. It engages at the instant the starter speed tries to overtake that of the gas turbine whether the gas turbine is rotating or stationary. It will also automatically disengage at the instant the gas turbine speeds up relative to the starter.
• Reduced re-start time - the starting drive can be engaged whilst the gas turbine is decelerating from speed. It is not necessary to wait for the gas turbine to come to rest for a re-start, thus saving considerable time before the unit can be generating power.
• Automatic operation - does not require a servo control system with air or hydraulic cylinders.
The SSS Clutch is a direct replacement for the Jaw Clutch with identical interfaces.