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(b)(c)there is a minimum contact of the transformer core and windings with the atmospheric air.Similarly drain oil from cooling circuit and radiators and fill dry clean oil.Whenever transformer windings are to be taken out due to any reason such as to repair adamage, thorough washing due to sludge formation or for thorough inspection to locate afault as a result of DGA or some other tests, after carrying out the necessary work for whichthe transformer was opened, do the following also:(i) Tighten all coil clamping screws to remove looseness from the windings, if any.(ii) Tighten all nuts and bolts whether metallic or made of insulating material onmechanical and electrical joints.(iii) Tighten core yoke bolts, core-clamping screws etc.Under the normal operating condition transformer has an useful life of about 25-30 years.This may vary considerably depending upon the overloads it has carried and the temperatureat which it has worked during its span of operation. Therefore for any future planning it maybe worth while to know well in advance the remanent life of the transformer in service. Thiscan be done by assessing extent of degradation of cellulosic paper through furan content intransformer oil or / and degree of polymerization (DP) of paper. It is proposed to carry outthis study after a period of 20 years of service. After knowing the remanent life in atransformer, the action can be planned in conjunction with life assessment studies ongenerating unit.As these are comparatively new studies, the data are still being built and one should go by there-commendation of the Test Laboratory. However the following figures may serve asguidelines.Degree ofFuran contentPolymerizationppm (mg/kg)New transformer 800-950 NegligibleNearing end of life 150-200 10AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 51
4.4 PREVANTIVE MAINTENANCE OF HYDROMECHANICAL EQUIPMENT4.4.1 Maintenance of Intake GatesThe maintenance work shall included• Cleaning up• Adjustment• Lubrication with recommended lubricants & methods• Replacement of Defective parts• Repair of damaged parts• Recoating of damaged coat on ropes• Recording details of all work carried out with date & time.Inspection and checks• Daily inspection should be carried out by gate operator to ensure:• Proper oiling and greasing wherever required• Tightening of loosened parts tightening contacts in electrical system• Check of ropes and hoisting arrangement.• Checking general condition of gates and gate grooves wheels etc.• Periodic inspection (half yearly or annual)• Dissemble and check all components for any damage.• Rectify damages or replace worn out irreparable components.• All safety precautions eg taking proper shut down installing safety tags, red flags etc.are must, when any work is being on gates.• Before taking up work on gates, stop log gates must be lowered in the groove meantfor the same and plug all leakages through these.• Lubrication of gate parts:• Servogem EPI (IOC) or (equivalent of other brand)- Rope drum shaft for all hoisting unit (once a month)- Plumber blocks for all hoisting units fitted with bush bearing (once intwo months)- Coupling for transmission shaft (once in two months)- Plumber blocks for manual operation (once in three months)• Servogem – 3 (IOC) or (equivalent of other brand)- Spherical roller bearings for gate wheels (once in 2 months)• Compound – D (Bharat camax) or (equivalent of other brand)- Lifting ropes (once in six months)• Servocoat 120 T (IOC) or (equivalent of other brand)- Gears & Pinions for all hoisting units (once in 2 months) (Meshingfaces only)- Gears & Pinions for manual operation (once in 3 months)- Gears & Pinions for all travel mechanism (once in 2 months)- Gears & Pinions for position indicators (once in two months)• Servosystem (320 IOC) or (equivalent of other brand)- WOM reducer for all hoisting units (once in two months)AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 52
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 and 48: • Check all joints, tightness of
Page 49 and 50: S.No.Item to beinspectedInspection
Page 55: S.No.Item to beinspectedInspection
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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