Power Plant Spare Part
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Description
Barring gear is the term normally used for the complete mechanism provided for the rotation of the turbine generator shaft at a very low speed after unit stoppage for any reason. The requirement for this is very important for all capacities of turbine generator units. Once the unit is "tripped" (i.e. the turbine stop valve is closed cutting off steam to the turbine) the unit starts slowing down (also known as "coasting down"). When it reaches a dead stop, if it is allowed to be in one position for some time there is a tendency for the turbine shaft to deflect or bend.
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Power Plant Spare Part
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