standards / manuals / guidelines for small hydro development - AHEC

oFig 11: Checking Balancing of Generator• Draw to some scale a line ‘OA’ to represent reading of first run.Extend OA to ‘C’ such that OA = AC• With centre ‘O’ and radius equal to second run reading to the earlierscale draw an arc.• With centre ‘C’ and radius equal to third run reading to same scaledraw an arc to cut earlier arc at point ‘B’. Join AB.Balance weight ‘W’ = The angle of this weight is to be put with reference to 0 o position and isgiven by angle 0AB.• Whether this angle is to be measured in the direction of rotation oropposite to the direction of rotation is done by trial. The position whichgives minimum vibration is the required position. This is done byFourth run. For fourth run calculated weight at calculated angle is putand machine run at full speed if dial gauge reading is almost zero, theweight and direction is corrected otherwise the weight is required to beput in the opposite direction.AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 68