Effect Of Hydraulic On Hydro Power Stations

1089 Words Aug 23rd, 2016 5 Pages

Water hammer or hydraulic transient is an unsteady flow phenomenon which is commonly found in closed conduits of hydropower station, water transmission networks, and liquid pipeline systems. Acute transients events in a hydraulic system often result from accidents and mishaps. Significant disturbances may occur in a hydro power station and causes a rapid change in the flow rate of the system during some operational conditions such as load rejection, load acceptances, and instant load rejection. This would, in turn, generates fluid transients in the hydraulic conveyance system, namely the penstocks, resulting in unacceptably low or high pressures in the penstocks depending on the triggering mechanism of the transients. Eventually, if not protected properly, the penstock may burst or collapse and human loss in some cases. The present paper reviews the available literature summarizing the effect of hydraulic transients on hydro power stations. Also an attempt has been made to analyze the effect of diameter, materials of the penstock on water hammer. The reviewed literature has shown that with the increase in diameter the effect of water hammer would reduce to as extent. It was also observed that with the change in material used in the fabrication of the penstock, the effect of water hammer change remarkably.
Keywords: water hammer, transient flow, penstock, materials, closed conduit, diameter 1 Introduction

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