 'TPS' syncronous Pelton Turbine
Synchronous Pelton Turbines for stand-alone operation.
These are suitable for heads from 20 m to 350 m and effective flow rates ranging from 0.5 l/s to 100 l/s. The buckets are made of precision cast stainless steel. All Pelton turbines are fitted with six nozzles controlled by special flow regulation valves which help the efficiency of the system. The wheel is directly splined to the generator shaft, in order to give an improved global output. All the main mechanical parts are in stainless steel. Accurate anti-corrosion processes are applied to all the surfaces.
Pelton wheel
The wheel buckets are in stainless steel of high mechanical resistance and are obtained by precision casting, thus ensuring high accuracy and good finishing. The buckets are fixed to the disk by TIG welding without added material. The buckets size depends on the nozzles dimension.
Generally, the coupling of the turbine shaft with the generator shaft is directly made, i.e. the wheel disk is directly splined to the generator shaft by means of a pliers hub. The disk and the hub are in stainless steel. In some cases, the coupling of the turbine shaft with the generator shaft is realised by means of a revolution multiplier, which is made up of a couple of pulleys with a cogged driving belt. All revolving parts are dynamically balanced.
Turbine case
The case consists of a welded assembly in sheet steel. The upper part of the internal cylinder, the two flanges and the external cylinder form the distributor, i.e. the feeding chamber of the pressure water to the nozzles.
The internal cylinder has also the function of gathering and conveying the water into the waste water trap. Furthermore, it fixes and supports the turbine-generator group by means of brackets welded on the cylinder external surface. A coupling ring, to be installed in the bedplate, is supplied to secure the turbine case.
The nozzles are pressed in special long-lasting plastic material, and their maximum number is 6.
The distributors for TPS041 and TPS075 models are provided with 3 or 4 piston valves, respectively, for the manual flow regulation.
The feeding group connects the penstock to the turbine case and consists of the introductor tube, on which the floodgate for plant control is mounted, the pressure gauge connection, the pressure gauge, and the pressure water side plug (bypass).
Three-phase synchronous generators are used, from which it is possible to draw single-phase energy. The rotating inductor is a 4-salient pole type. These generators are characterised by the absence of brushes. The excitation current is supplied by an auxiliary generator whose induced rotor is mounted on the same shaft of the main generator. The excitation regulation is voltamperometric by "Compound" system. The TPS024 series plants are provided with a single-phase synchronous generator with a 2-salient pole rotating inductor.
The ball bearings of all generators are "water tight", hence, they require no lubrication. The generator is separated from the turbine by a special shield preventing any contact with water
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