Mavel Kaplan BULB Turbine
Technical Specification
GENERATOR
TURBINE [INLET DISTRIBUTOR
GUIDE VANES
GEARBOX
RUNNER BLADE
DRAFT TUBE
1.3 Turbine Distributor
The distributor is composed of inner and outer wicket gate ring. The inner wicket gate ring has spherical
shape that supports the sixteen wicket gates. The distributor will be bolted to the turbine body and is
coincidental with the runner axis.
The wicket gates are steel castings, machined in a CNC milling machine, and polished as the final
procedure. Their special prismatic shape will allow them to work both to regulate the turbine and to
shut it in the event of an emergency. They will be built as a single piece with integrated trunnions.
Each guide vane has have self-lubricated slide bearings to support the wicket gates trunnions. Each
wicket gate trunnion is connected to the regulation ring by levers. The regulation ring provides the
torque to turn the wicket gates for regulation and emergency closure. Each wicket gate has a friction
clutch, which allows slippage for overload conditions that protects the mechanism from damage due to
debris in the water passage. The wicket gate is adjusted back to its correct position by means of a special
tool (supplied with the turbine).
The wicket gates levers are connected to the regulation ring through two ball joints with a connecting
rod in between. The regulation ring turns on eight bronze supports placed close to the outer guide vane
plate. A single linear servomotor will provide the impulse for the rotation of this ring. The regulation ring
is also provided with a counterweight to close the wicket gates on loss of HPU oil pressure.
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