standards / manuals / guidelines for small hydro development - AHEC

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• Check insulation of vapour seal also and replace, if found damaged• Check condition of housing, pivot points of thrust bearing.• Check all pressure gauges, level indicator.• Check all RTDs & TSDs- Maintenance of Air Coolers• Clean inside and outside of air cooler tubes• Check for any tube leakage by pressurizing to a pressure slightly more than max.expected working pressure• If more than 10% tubes are leaking change full set of tubes otherwise change onlyleaking tubes• After repair paint the body of coolers.- Maintenance of Oil Coolers• Clean inside and outside of cooling tubes• Check for any tube leakage by pressurizing to a pressure slightly more thanmaximum expected working• Replace full set of tubes if more than 10% of total tubes are leaking.- Maintenance of H.S. Lub system• Inspect bearing and grease, if necessary• Check the condition of hoses, if necessary replace• Check for any leakages and take remedial measures.• Check pressure gauges etc.- Maintenance of Flow relays, visual flow indicators and flow meter:• Inspect, clean water passages remove silt.• All defective meters are to be replace.- Braking and jacking system:• Check brake units and clean inside outside of the unit• Change seals• Carry out hydraulic test• Clean the filters, bowl of lubricator• Check brake track, tighten dog clamps• Check working of brake limit switches.• Replace brake lining- General checks• Check condition of current carrying leads.• Check all water & oil valves for their proper working• Check general operational healthiness of all auxiliaries• Check proper working of overspeed device.4.3 PREVENTIVE MAINTENANCE OF POWER TRANSFORMERSThe maintenance of transformer is an ongoing process and stress should be on preventivemaintenance rather than acting when a fault occurs. A schedule of maintenance activities is drawnand tabulated below. This is applicable to Main, Auxiliary, stator & distribution transformers.AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 43
S.No.Item to beinspectedInspection ProcedureAction required ifunsatisfactory conditionindicatedApplicable fortransformersApplicableUATS, SSTS anddistributiontransformerswhen ticked √1 2 3 4 5A Hourly1. AmbienttemperatureTake air temperaturenear the transformer√for air coolertransformers. Takewater temperature atthe inlet to the coolerfor water cooledtransformers.2. Windingtemperatureindicator readingrelationCheckforabnormalities in toambient temperatureand load.If the temperature indicatedis more than envisaged asper loading condition, check:i) That radiator valves orcooler circuit valves areall open.ii) Fans operate at set valueof temperatures.iii) Fans/oil pumps are incircuitiv) Winding CT connectionand C.T. ratio adopted.v) Check calibration of OTIand WTI.3. Oil temperatureindicator reading-do-4. Load (amperes) Check against rated - Reduce load if it exceedsfiguresthe specified limits.5. Voltage - Correct tap position inline with voltage.6. Transformer/ Check for any - Tighten any looseness inShunt reactor abnormality in sound. external parts. Ifhumming andabnormal sound stillgeneralpersists, completevibration.checking be done.B. Daily -1. Oil level in Check oil level from - Top up if found low.transformer / oil gaugeExamine transformer/shunt reactor2. Oil level indiverter switchCheck oil level fromthe gauge glass.shunt reactor for leaks.- Tighten gasket joint atthe leak point.- If oil leakage found,check sealing gasketbetween diverter switch√√√AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 44
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 and 32: E. GovernorDifferent types of gover
Page 33 and 34: 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: • Check all joints, tightness of
Page 51 and 52: 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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