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The reduction gear has been developed for driving generator of gas turbine generating system, and shall function as a gear to reduce the speed of a gas turbine to a generator's speed through the medium of planetary gear, and also as a torque limiter.
The torque limiter shall be of a hydraulic clutch type where technique of a wet type multi-disc clutch. Starting torque when excessive torque works shall be set up by clutch operating oil pressure, since a hydraulic clutch system is adopted.
The clutch plate shall not cause any heat nor energy loss due to slipping, as the clutch plate shall slide out only in the instant that excessive torque is in action and be used in the condition of being clutched-on completely. Additionally, a torque-limiter-only type (HLH type) that does not have speed reduction mechanism is in production.