Abstract: The reason of too large synchronous error occurred in operation of the radial gate of the floatage drains of a hydropower plant was analyzed. Using the beforehand given deviation compensation of the opening, the load deviation value was decreased. For the radial gate with dual lifting point, which has better rigidity, the rigid synchronous loop or load balance control mode should be adopted; and the cylindrical hinge or cone hinge should be used as supporting hinge. Thus, the too large synchronous error will be controlled more easily.
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Key words: radial gate with dual lifting points, too large synchronous error, rigid synchronization, load balance