Hitachi, Ltd.

Naoaki Shibashita

Ryoichi Kaneko

Kiyoshi Shimomura

Hajime Toriya

Takeshi Kudo

Satoshi Kanno

Haruo Urushidani

Tasuku Shimizu

Shinji Sakata

Tateki Nakamura

A steam turbine test facilityincludes a test steam turbinewhich simulates the behavior of a real steam turbinesincluded in the steam turbine plant, and a motor-generatorconnected to the test steam turbine. A control unitincluded in the motor-generatorcontrols the motor-generatorto change the rotational speed of the test steam turbinebased on an arbitrarily set speed change pattern. The speed change pattern is set such that the test steam turbinein the load disconnection state simulates a time-profile of the rotational speed of the steam turbineswith the load disconnected.

Steam turbine test facility, low-load test method, and load dump test method

A method system for assessing the safety of a rotor of a shrinkage fitted type wherein an opening displacement of a crack is determined an elastic-plastic fracture method and a reduction in shrinkage fitting force is calculated based on the crack opening displacement. The safety of the rotor is assessed based on the reduction in shrinkage fitting force caused to occur by the opening of the crack.

Method of and system for assessing the safety of shrinkage fitted type

A method of starting a turbine having a shrinkage-fitted rotor provided by shrinkage-fitting discs onto a shaft comprises the steps of raising the temperature of the rotor above a predetermined temperature determined from a physical value of the material constituting the rotor and, thereafter, raising the rotational speed of the turbine from the turning speed to the rated speed, whereby the centrifugal stress on raising the speed acts on the discs in a state wherein the value of fracture toughness of the discs fitted on to the shaft has increased.

Method and an apparatus for starting a turbine having a shrinkage-fitted

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Hitachi, Japan

Naoaki Shibashita