standards / manuals / guidelines for small hydro development - AHEC

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servo tube. The servo tube has ports to receive return oil to the pipes coming form OPUsump. This tube is guided by three sets of bushes in the oil tube. Due to run out of the shaftthese bushes has to press the servo tube. Failure of these had been very frequent in one of thepower station.Monitoring of wobbling of the servo tube with help of dial indicator may provide a guide lineand save the bushes from further wearing. Remedial measures to reduce run out of the servotube must be taken at this stage.At the time of assembly of various parts of header proper match marking and dowelling isessential so that reassembly may be correctly done.4.2 PREVENTIVE MAINTENANCE OF HYDRO GENERATORPreventive maintenance ensures a long trouble free operation of the generator. Given in thefollowing table are the recommended daily, monthly, once in 3 months, half yearly & yearlymaintenance checks to be conducted on the generator. While it is appreciated that it is not alwayspossible to rightly follow this schedule due to generator loading constraints, the recommendationgiven may be taken as a guide line and these may be altered slightly, based on the past experience.Sl. No. Description Periodicity Remarks1.00 Stator:1.01 Temperature record on log sheet for core and Hourlywinding, hot and cold air temperature1.02 Visual inspection of the overhang parts of the Once in 3stator winding.months1.03 Checking the fixing of winding, condition of Once in 3winding joints with bus bars etc.months1.04 Clean the winding with dry & clean Once in 3compressed air (2 to 3 kg/cm 2 ).months1.05 Check overhang parts of stator winding, busbars, inner periphery of stator core (ifpossible), parts of stator winding in slots(specially at sector joint) binding & spacersbetween the winding bars/ bandage rings.1.06 Check looseness of overhang, busbars slotwedges etc.1.07 Check the fixing of stator active iron with theframe body in all possible places. If it isnecessary, tighten the studs of pressingplates.1.08 Check pins & fixing of stator withYearlyYearlyYearlyYearlyCleaning to be donesuch that the dust doesnot collect in sidemachine.foundations.1.09 Check D.C. resistance, IR & PI value. Yearly Record to bemaintained1.10 Check functioning of RTDs of stator. Yearly -do-1.11 Blow the winding, active iron and bandagerings etc. with dry & clean compressed air (2YearlyAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 27
Sl. No. Description Periodicity Remarksto 3 kg/cm 2 ).1.12 After cleaning apply Red-gel coat on the YearlyNot required duringoverhang.600 hrs. inspection.1.13 In case of excessive wetting of stator winding As per External heatingduring conditions such as flooding, drying ofwinding by passing current is not allowedinitially as electrolysis of water may takeplace. Which is harmful to the winding.requirement arrangement is to beprovided till wetnessis removed2.00 ROTOR:2.01 Check rotor winding and insulation details ofcurrent carrying leads.Once in 3months2.02 Check the condition of interpolar connectins Once in 3months2.03 Check the condition of damper winding. Once in 3months2.04 Check the locking of pole wedges. If required Yearlycarryout additional wedging.2.05 Check locking of rim wedges Yearly In case the wedges areloose contactmanufacturer beforeattempting anyrectification.2.06 Check the gaps of spider arms, brake track. Yearly2.07 Check tightening & proper locking of allfasteners.2.08 Clean rotor from dust by blowingcompressed air free from moisture (2 to 3kg/cm 2 ).YearlyYearly2.09 Measure D.C. resistance and IR value of YearlyKeep a recordrotor winding.2.10 Check the pole coils for interturn fault. Yearly Not required during600 hrs. inspection.3.00 Slipring & Brush Rocker3.01 Check sparking. Every shift3.02 Check pitting & Grooving of slipring Monthly In case of excessivegrooving rectify bygrinding.3.03 Check IR value of rotor through slipringsbefore & after cleaning sliprings.3.04 Clean the brush rocker, Brushes, slipringsand the surrounding areas.Once in 3monthsMonthlyKeep a recordSpecial care be takento clear carbon dustfrom ‘V’ shapedinsulation pieces fittedbetween sliprings.3.05 Check brush wear & spring tension. Monthly Use a precision springbalance for adjustingspring tension. Thecarbon brushes can beAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 28
Page 1 and 2: STANDARDS / MANUALS / GUIDELINES FO
Page 3 and 4: ITEMSPAGE NO4.2 Preventive Maintena
Page 5 and 6: SECTION - IGUIDELINES FOR OPERATION
Page 7 and 8: 2.1.2 Lake/Storage/PondThe operatio
Page 9 and 10: 2.2.3 Electrical• Air seal valve
Page 11 and 12: • Start command initiated(iv)Sync
Page 13 and 14: ‣ Check whether supply to various
Page 15 and 16: - Intake gates, bye pass gates, D.T
Page 17 and 18: • To arrange for evacuation of ma
Page 19 and 20: SECTION - IIGUIDELINES FOR MAINTENA
Page 21 and 22: 2.3 PREDICTIVE MAINTENANCEThis sort
Page 23 and 24: 6. Oil Leakage Unit:i) Check any le
Page 25 and 26: 5. Shaft Gland Seal and Air Seal:i)
Page 27 and 28: v) In case the runner is found to b
Page 29 and 30: iii) Preheating of the blade to abo
Page 31: E. GovernorDifferent types of gover
Page 35 and 36: Sl. No. Description Periodicity Rem
Page 41 and 42: 4.2.1 Daily ChecksSl.No.Assembly It
Page 43 and 44: 4.2.3 Annual Inspection & Maintenan
Page 45 and 46: Sl.No.Assembly Item Check Point Met
Page 47 and 48: • Check all joints, tightness of
Page 49 and 50: S.No.Item to beinspectedInspection
Page 57 and 58: 4.4 PREVANTIVE MAINTENANCE OF HYDRO
Page 59 and 60: Spherical valves (for heads more th
Page 61 and 62: • Check rotor level, verticality
Page 63 and 64: • Any possible inbalance of runne
Page 65 and 66: The blades are set to the no-load p
Page 67 and 68: IV.Rotational Checks‣ Arrangement
Page 69 and 70: Fig 6: Resultant Method of Throw Ca
Page 71 and 72: Fig 9: checking Verticality of Gene
Page 73 and 74: oFig 11: Checking Balancing of Gene
Page 75 and 76: Procedure for preliminary alignment
Page 77 and 78: Fig 14: Determining Displacements o
Page 79 and 80: SECTION-IIIGENERAL GUIDE LINES1.0 G
Page 81 and 82: • On placing them on operation du
Page 83 and 84:
Safety Precautions and Practices in
Page 85 and 86:
Results of test and measurements ca
Page 87 and 88:
(NAME OF POWER STATION)DAILY GENERA
Page 89 and 90:
(NAME OF POWER STATION)DAILY TRIPPI
Page 91 and 92:
UnitGENERATION(MU)TOTALTIME(Hrs:Min
Page 93 and 94:
MONTHLY TRIPPING REPORTFOR THE MONT
Page 95 and 96:
AHEC/MNRE/SHP Standards/ E&M Works
Page 97 and 98:
(POWER STATION)ANNUAL MAINTENANCE S
Page 99 and 100:
UNIT/ EQUIPMENT/ FEEDER BAY/:DATE &
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