standards / manuals / guidelines for small hydro development - AHEC

More documents

Recommendations

Info

4.5.9 Alignment of Horizontal Generating SetAdjustment of Turbine Shaft• The centre line of turbine bearing with respect to longitudinal axis of generator ischecked by stretching a horizontal wire through spiral casing and along bearing centreline. Correct position of wire inside spiral casing is checked with inside micrometer.• Bearing housings are centered with respect to longitudinal axis of generator by an endgauge which is inserted into the bores of bearing shell• Ensure clearenses of guide vanes at both ends are uniform and are between 0.2 to 0.6mm. Feeler gauge is used to check these. These can be adjusted by tightening bolts.When distributor is closed there should be no clearance in guide vanes.• Measure clearance with feeler gauge between shaft and the lower bearing shell toensure correct position of rotating parts of turbine.• If there is no clearance, it indicates that the shaft is resting on both bearings.• The horizontal position of shaft is checked by placing a level successively on bothbearing journals. Then turn the level by 180 o and place in the same position as beforeand check level. Arithmetic mean of two measurements should be taken, if twodiffer (more than one division). If difference is more investigate reasons and takeremedial measure,• The permissible inclination in shaft is 0.04 to 0.06 mm per m length of shaft.• The permissible inclination in transverse direction is 0.1 mm / m of shaft length. Thisshould also be checked with level.• The radial clearance between runner and the cover plates which should not exceed 2.5to 3.0 mm. these should be uniform.• The gaps in labyrinth seals should be with in 0.5 to 0.6 mm.• The axial gaps in labyrinth seals should also be measured and these should be within0.2 to 0.3 mm. These are measured by pushing the rotating parts to extreme positions.• All the clearances and gaps are measured again after turning the rotating parts through180 o and 360 o . These should be with in permissible limit.• 1 mm thick lead wire of 30 to 50 mm length is used to measure clearance betweenturbine shaft and the upper bearing shell. Length of this wire are placed across theshaft in two sections beneath the shell which is then tightened well. The thickness offlattened wire thus indicate the clearance on top of the shaft which should be 0.2% ofshaft dia.• The lateral clearance between the shaft and the lower shell are checked at a depth 10to 12 mm below the plane in which bearing is split. These should be half of clearancebetween shaft and upper bearing shell.• The adjusted shaft of turbine will be reference base for alignment of generator shaft.Preliminary alignment of generator shaftAlignment consists(i) Removal of misalignment of turbine shaft and generator shafts (Fig 12)(ii) Making generator shaft horizontal(iii) Making centerlines of generator and turbine shaft coincide(iv) Alignment is carried out relative to half couplings of turbine and generator shafts(v) Wobbling at half coupling should not be more than 0.2 mmAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 69
Procedure for preliminary alignment:• The turbine and generator shafts are forced to their outer most position after thegenerator is assembled and clearance between half coupling is ensured. This clearanceshould be 5 to 6 mm (or as designed)• A straight edge is pressed against the turbine or generator shaft along generator axis infour diametrically opposite positions. Clearance if any is checked and equalized. Forthis shims are provided beneath foundation fame.• By measuring clearances between faces of half coupling at four points, alignment ofshafts at joint is checked.• The position of generator is first checked in vertical plane than in horizontal• Misalignment is corrected by placing shims under foundation frame• After this foundation bolts are tightened and lockedFig 12: Misalignment of turbine and generator shafts [Goncharov]Procedure for final alignment• Check positions of half coupling• Measure clearances between half couplings in the initial position and after turningthrough 90 o , 180 o , 270 o & 360 o• The position of half coupling should be same of initial position and after rotation by360 o• For radial displacement of half couplings is measured by mounting a dial indicator ona bracket fixed at turbine half coupling (Fig 13)Fig 13: Aligning Horizontal Generator with Turbine [Goncharov]AHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 70
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 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: oFig 11: Checking Balancing of Gene
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 &
show all

standards / manuals / guidelines for small hydro development - AHEC

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?