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Transmission Line Towers and details

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Transmission Line Tower Erection

Transmission Line Tower Erection


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    • 1. Classification of Towers based on 1)No. of Circuits a. Single circuits towers b. DC/SC towers c. DC towers d. MC towers
    • 2. 2)AOD a) Suspension/Tangent towers <2° b) Small angle towers 2 ° -15 ° c) Medium angle towers 15 ° -30 ° d) Large Angle towers 30 ° -60 ° e) Dead end towers >60 ° f) Transposition towers(4Xarms) g) Special towers – JC, MC, NB, NBMC h) Pole mounted termination towers i) Mono poles
    • 3. SC DC/SC (B/B) MC (B/B) NB (B/B) A P/D(4.2) K(8) 0° (1.3) B R(7.15) L(8.7) 30° (1.31) C&D S(7.75) M(11.5) 60° (3.174) Bot Xarm Ht Bot Xarm ht 12.283 12.35 12.3 Total Height Total height 27.381 38.46 27.1 132 KV Note: All in meters
    • 4. L&T TSP M/C NB A AV/AS X 0° B BS Y 30° C CS(8) Z(17) 60° (3.3) D(11) BotXarm Ht 16.85 19.085 17.45 11.79 Total Ht 33.5 38.035 51.4 29 220 KV Note: All in mesters
    • 5. NB MCNB(220KV) MCNB(132KV) 120m 250m 300m 60° 0, 30 & 60 Deg 0°, 30° & 60° 2.2 5.4 3.936 14 13.1 12.15 Special towers
    • 6. Mono pole 180m 0°, 30° & 60° Bot Xarm Ht 15.8
    • 7. For river crossing suspension towers only Height(m) Base width (B/B) (m) Bot Xram(m) Wt. (MT) Full JC 88.2 12.38 69 32.5 Trunk JC 72.15 10.4 52.5 28.9 JC
    • 8.  +3m  +6m  +9m  +12m  +18m  +25m  +30m Tower extensions: Generally extensions are added to the tower at Bottom section . Cage Extension is added at cage for dead end towers, the extension Will be of 3m & 5m
    • 9.  Normal span: 320m for Panther  350m for Zebra and L&T towers  380m for Moose and TSP towers  950m for JC  Actual span  Wind span  Weight span: Left wt. span & Right wt. span  Equivalent span  Negative span SPANS:
    • 10. Erection a) Setting of stubs: Template B/B & diagonal at Template top B/B & diagonal at stub top Ram bus shape Stub cleats with B&N 2 each Extra cleats to avoid failure of foundation due to tower falling. Threads to bisect LP&AP Template height at centre point & joining of 2 threads Probe setting
    • 11. b) After 14 days of curing Built-up method:- This method consist of erection of towers member by member. The 4 main leg members of first section of the tower are first erected and guyed of. The cross braces then assembled. For assembling second section a light gin pole is placed on top of the corner legs for raising the second section of the tower. Afterwards the gin pole is shifted to top of second section leg to raise third section this process is continued till complete tower is erected.
    • 12. Section method :- Major sections of the tower are assembled on the ground and same are erected as units. Either mobile crane or gin pole of 10m long is used. Ground assembly(Proto) :- This method consist of assembling the tower on ground and erecting it as a complete unit. The complete tower is assembled in line wise position to allow Xarms to fitted. After assembly is completed tower is picked up from ground with the help of crane and carried to is location and set on its foundation. This method is not is useful when the towers are large and heavy and the locations are difficult.
    • 13. Helicopter method :- In this method the tower is erected in section. Bottom section is first lifted on to the stub and then the upper section is lifted and bolted to first section and the process is repeated till the tower is erected. Some times complete assembled tower is raised with the help of helicopter. This method is adopted when approach is impossible.
    • 14. oTower parts – 86 Microns oBolt & Nuts - 45 Microns Galvanization : MS tower parts to Galvanized tower parts Galvanization Procedure 1 2 3 54 6 7 8 1. Decreasing Bath Hard HCL 2. Pickling HCL 3. Rinsing Water 4. Fluxing Ammonia and Zinc Chloride 5. Hot plate 6. Zinc batch 7. Dychromizing 8. Finishing & Filling
    • 15. Tightening of B&N The bolts & nuts are used to join the tower parts The bolts are of 16mm diameter and 20mm diameter The length of bolts are various from 35mm to 80mm multiple of 5mm 17.5mm/21.5mm dia hole is provided on tower part for fixing bolt & nut Spring washers - 16 x 3.5 mm- to tighten the bolt&nut Flat washers 4, 5, 6, 8, 10,20 and 25mm to fill up gaps between the tower parts Check for tight of B&N using torque wrench
    • 16. The threads of bolts projecting out side shall be punched at 3 positions and do half round welding to ensure that nuts are not loosened in course of time and avoid theft of angles. Zinc epoxy painting is applied on welded portion to avoid rusting.
    • 17. Tower verticality :- 1 in 360 Slenderness Ratio = Effective length of members / Radius of gyration SR gives Resistance of any member to bending SR for leg members - 150 Tension members - 350
    • 18. Grounding : - pipe earthing –Tower foot Resistance<15 ohm CP earthing - 15 – 30 m of 7/8 or 7/9 SWG galvanized steel wire 50x6mm flat of 1.5m length is used & flat should be buried at 0.6m below the ground level.  Earthing pipe is of 25mm dia, 3050 meters length GI pipe with holes. Explain practice of coke and salt, betonite powder
    • 19. earthing is provided for D leg only For Railway crossing double earthing is to be provided. Normally earth pipe is placed vertically & in difficult places earth pipe placed in slant position with prior approval. A pit of 300mm dia and 3.2m depth is excavated to place earth pipes.
    • 20. Tower Accessories: - Danger boards Number plate Phase plate Anti Climbing Device Step bolts 16x175 mm Antiperch / Bird guards for suspension towers Hanger rods
    • 21. i) NO TOWER SHALL BE ERECTED ON FOUNDATION BEFORE 10 DAYS AFTER CONCRETING. ii) CHECK THE CORRECTNESS OF DIAGONAL AND LEVEL OF THE STUB OF THE FOUNDATION. iii) TOWERS ARE TO BE ERECTED AS PER ERECTION DRAWING iv) ASSEMBLY OF TOWER PARTS SHALL BE MADE AS PER MARK NUMBER WISE ENGRAVED ON THE TOWER MEMBER CORRESPONDING TO NUMBER IN THE ERECTION DRAWING. v) SPECIAL CARE SHALL BE TAKEN IN SELECTION OF MARK NUMBER FOR TRANSVERSE AND LONGITUDINAL FACE OF THE SQUARE BASE TOWER. vi) ANY BUCKLING, DAMAGE TO STEEL MEMBER, DAMAGE TO GALVANIZING SHALL BE AVOIDED
    • 22. vii) NO MEMBER SHALL BE SUBJECTED TO UNDUE STRESS. viii) REASON CAN BE: (i) DEFECTIVE FABRICATION. (ii) DEFECTIVE FOUNDATION. (iii) DEFECTIVE ERECTION METHOD. viii) COLLECT MATERIAL FROM STORE TALLYING WITH BOM. ix) PREFERABLY TRANSPORT COMPLETE TOWER OR COMPLETE SECTION. x) THE TOWER MEMBER AT LOCATION SHALL BE KEPT ON GROUND SERIALLY ACCORDING TO THE NEED FOR FOLLOWING UP ERECTION SEQUENCE.
    • 23. TOWER ERECTION DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE CROW BARS DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE CROW BARS DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE CROW BARS DERRICK DERRICK TYING ROPE 20mm POLY PROPYLENE ROPE CROW BARS
    • 24. i) WHILE LOADING AND UNLOADING THE TOWER PARTS, CARE SHOULD BE TAKEN FOR STACKING SYSTEMATICALLY. ii) HANDLE THE TOWER PARTS CAREFULLY. WHILE HANDLING THEM WEAR SUITABLE GLOVES. iii) ESTABLISH CLEAR SIGNAL/COMMUNICATION BETWEEN THE PERSONS WORKING ON THE TOP AND THE PEOPLE SUPPLYING TOWER PARTS, WATCHING GUYS PULLING ETC SPECIAL CARE SHALL BE TAKEN FOR R.C. TOWER. iv) ALL LIFTING TOOLS AND TACKLES SHOULD BE LOAD TESTED AS PER STANDARD.
    • 25. vi) ENSURE THE DERRICK USED BEFORE TOWER ERECTION HAS BEEN CHECKED FOR ADEQUATE STRENGTH / SIZE. vii) KEEP WATCH ON ALL GUYS USED DURING ERECTION ANY SLIPPAGE/FAILURE IF THE GUY CAN CAUSE ACCIDENT. viii) POLYPROPYLENE ROPE FROM 20MM TO 25MM SIZE SHOULD BE USED FOR GUYING & LIFTING. ix) AFTER 5 OPERATIONS CHECK THE CONDITION OF THE ROPE. IF WORN OUT THEN REJECT.
    • 26. xi) ALL TOWER MEMBERS TO BE FITTED WITH APPROPRIATE SIZE OF NUTS & BOLTS OF THE SECTION ERECTED BEFORE THE ERECTION IS TAKEN UP FOR THE NEXT SECTION. xii) AVOID ALL TOWER ERECTION IN RAINY DAY. xiii) HEAVILY CLOUDY DAYS AVOID ALL TYPE TOWER ERECTION. STOP TOWER ERECTION OF R.C.TOWER. xiv) IN CASE OF HEAVY WIND OR APPROACHING STORM STOP ALL TOWER ERECTION. EVERY ONE SHOULD BE AWAY FROM THE TOWER. xv) PPE LIKE HELMET, SAFETY BELT OF PROPER QUALITY IS USED. xvi) FOR CLIMBING TOWER USE SAFETY BELT WHICH CAN BE FITTED TO THE TOWER.
    • 27. Conductor Amps Kg/KM AL59 INVAR Panther 489 974 734 Amp. Double Panther 30+7/3.00 Zebra 737 1621 930 Amp. Double Zebra 54+7/3.18 Moose 840 1998 54+7/3.53 LINE MATERIALS 1.Conductors
    • 28. AAAC- Less wt., more sag, & more current carrying capacity ACSR- More wt., less sag, & less current carrying capacity I. Total No. of wires = 3N(N+1)+1 ; Where N= No. of layers Layer No. of wires Total Centre 1 1 1st 6 7 2nd 12 19 3rd 18 37
    • 29. II. Lay Ratio = Lay/OD ; Where OD = Outer diameter=(2N+1)d; where d= Dia of single strand 18 wires 10 – 12 12 wires 12 -14 6 wires 13 -18
    • 30. 2.Earth wire: Shielding angle 10 – 30 ° 7/3.66 → 7/3.15 Weight /KM 575 428 Kg/KM 3. Insulators: 70 KN, 120KN and 160 KN Voltag e Suspension Angle 132KV 9Nos 10Nos 220KV 13Nos 14Nos 400KV 23Nos 24Nos
    • 31. 132÷√3 = 76.2 KV ≈ 80 KV ÷ 11 = 8 Nos + 1 extra = 9 Nos 220÷√3 = 127 KV ÷ 11 = 12 Nos + 1 extra = 13 Nos 400÷√3 = 230.95 KV ÷ 11 = 21 Nos + 1 extra = 22 Nos or Say 23 a) Porcelain Insulators :- Ball and Socket Long rod b) SRC Insulators :- Silicon Rubber Composite FRP rod with sheds, fiber resin plastic rod
    • 32. Insulator hoisting Suspension insulators shall be used upto deviations of 2 degrees on all tangent type towers on the line and strain insulators on all angle type towers. For ensuring insulation co-ordination the suspension or tension strings on approach and terminal towers near the station ends upto a length of 1.5 Km shall be provided with adjustable arcing horns on tower side and fixed arcing horns on line side, keeping the arcing gap as may be stipulated by the Engineer at site. Insulator strings shall be assembled on the ground. These shall be cleaned and examined before hoisting. All accessories shall be properly fitted. Those having glazing defects exceeding half centimeter square shall not be used.
    • 33. For suspension towers 70 KN insulators are hoisted with Aerial rollers. The Aerial rollers are like single sleeve pulley .Before hoisting of insulators the M pins should be checked thoroughly for their opening so that the insulation will not detached during stringing.
    • 34. 4. SSH for conductor:- PA rods 11 – 14 Nos; where PA= Preformed Armoured Rods 5. STH for conductor 6. DSH for conductor 7. DTH for conductor 8. SSH for earth wire 9. STH for earth wire 10. 4R stock bridge vibration dampers (1.2 – 1.3m) 11. MS joint for conductor 12. MS joint for earth wire 13. Repair sleeves
    • 35. CORRECT METHODSWRONG METHOD
    • 36. i) SELECT CONTINUOUS STRETCH AND STARTING TYPE OF TOWER FOR STRINGING WITH ADEQUATE CARE. ii) PREPARE DRUM SCHEDULE FOR CONDUCTOR WITH CARE TO REDUCE WASTAGE. iii) SELECT PROPERLY THE PLACEMENT SCHEDULE FOR TENSIONER AND PULLER. iv) SELECT THE PLACE CAREFULLY FOR PLACEMENT OF TENSIONER AND PULLER TAKING SITE CONDITION INTO CONSIDERATION. v) CHECK CORRECTNESS OF ERECTED TOWER AS PER DRAWING AND SPECIFICATION FOR ALL TOWERS. vi) CHECK COMPLETION OF EARTHING AND RECORD TOWER FOOTING RESISTANCE OF EACH LOCATION. vii) ALL TREES ENROUTE THE LINE SHOULD BE CLEARED AND REMOVED FROM THE TRAVELLING PATH OF CONDUCTOR. viii) CERTIFY AFTER VERIFICATION JOINTLY.
    • 37. STRINGING a)Paving out of conductor b)Rough sag c)Final tension / stringing
    • 38. METHOD  SLACK OR LAY OUT METHOD.  PAYING BY TENSIONER PULLER.
    • 39. T&P required :- Tractor/Tensioner Turn table (5T or 10T) Conductor socks Automatic come along clamp for conductor and earth wire 20mm and 25mm D shackles Wooden packs Ground rollers Aerial rollers Crowbars Hacksaw blade Cutting pliers Screw driver Spanners
    • 40. 1. Generally drum lengths are Panther 2KM Zebra 1KM Moose 1KM Earth wire 2KM 2. Place the conductor drum on TURN TABLE & unwind it. 3. Pull the end of conductor over ground rollers and passing through Aerial rollers at suspension towers reach the next cut point tower using tractor/ tensioner.4. Make up the end of conductor to the cut point tower with STH/DTH 5. Follow the same procedure for balance conductors and earth wire
    • 41. Rough sag T&P required:- Rough sag leads Steel ropes 10mm, 12mm, 15mm and 16mm Come along clamp (7 bolts) Slings (20mm) 4 Sheave pulley 2 Sheave pulley Single Sheave pulley Manila ropes 12mm, 16mm, 18mm and 20mm Single and double end socks Turn buckle D shakles 20 mm Dead man 1to 1.2 m
    • 42. 6. By connecting the other end to LEPTY do the rough sag by pulling with tractor/tensioner and see that conductors are lifted In all spans by hand height. 7. Common problem is BARD CAGING LEPTY made with steel rope of 12mm of 200m and 400m lengths with four sheave pulleys on either end.
    • 43. Final tension /Stringing T&P required:- 1. Leg winch 2. Sag boards 3. 100 MT joint compressor with die sets suitable for panther, Zebra Moose and earth wire. 4. Earth wire flat clamps 5. D shackles 16mm/25mm 6. Binoculars 7. Tractor / Tension puller
    • 44. 8. Travelling speed will be 5 – 8 KM per hour. 9. if speed is low causes swinging of traveler and insulator hardware and higher speed cause damage. 10. Tension load will be around 2000 – 2500 Kgs 11. For 3rd crossarm stringing tension will be 500 Kgs 12. For 400 KV pilot wire and tensioner is used. First pilot wire will be passed through the entire reach with Tractor. Conductor is winded on Tensioner. Pilot wire is knotted to conductor. The other end of pilot wire is connected to Puller.slowly puller load applied and tensioner is releasing the conductor without any problem and make up at this with STH. Once paving is completed again load Tensioner till sag point and guyed. Then by Lepty and Tractor make marking and cater the end.
    • 45. 13. Measurement of sag with equal supports use sag boards between the two towers of sag span 14. Measurement of sag where supports are at different height or single spans. Use Dynamo meter for tension readings 15. Sagging section length should not exceed 5KM or 15 spans 16. Physical measurement of ground clearance on roads and important places.
    • 46. A A A 1.50M LONG ISMB 200 BACK FILLED EARTH STEEL ROPE OF 20MM DIA DETAIL – ‘A’ 100MM 300MM 1100MM 150MM
    • 47. BACK FILLED EARTH 1.50M LONG ISMB 200 STEEL ROPE OF 20MM DIA DETAIL – ‘A’ 100MM 300MM 1100MM 150MM A A A
    • 48. TOOLS & PLANT REQUIRED PER CONDUCTOR 1. 20mm dia wire Rope Slings 40m length - 1 No. 2. 20mm 'D' Shakles - 2 Nos 3. Come along Clamp (Bolted Type) - 1 No. 4. 20mm Sling 10m length - 1 No. 5. Deadmen wood (1000mm-1200mm long)- 1 No. DETAIL – ‘B’ 2.00M LONG ISMB 200 BACK FILLED EARTH STEEL ROPE OF 20MM DIA 100MM 300MM 1600MM 250MM 40m Approx. Excavated pit for Anchoring of Conductor TENSION TOWER SUSPENSION TOWER SUSPENSION TOWER B
    • 49. DETAIL – ‘C’ 2.00M LONG ISMB 200 BACK FILLED EARTH STEEL ROPE OF 20MM DIA 100MM 300MM 2100MM 250MM C NOTE: Sling size = 20mm. Depending upon the Tension load rope size should be selected which is dependent on no of conductors type and the tension applied during the sagging. Arrangement should be capable of 1.5 times of the total tension load.
    • 50. IMPROPER GUYING ARRANGEMENT RAIL PIECE BACK FILLED EARTH STEEL ROPE RAIL PIECE BACK FILLED EARTH HOOK HOOK STEEL ROPE HOOK PROPER GUYING ARRANGEMENT PROPER GUYING ARRANGEMENT
    • 51. After stringing ensure the following Any departures from the correct sag in any span does not exceed 4 percent. The sag of any conductor does not depart by more than 3% from the mean sag of all the conductors in the same span subject of a maximum of 150mm.
    • 52. i) BACK TENSION OF BOTH THE TENSION TOWERS OF SAG SECTION IS MOST IMPORTANT. PROVIDE BACK TENSION BY PAID OUT CONDUCTOR OF THE NEXT ADJACENT SECTION OF BOTH TENSION TOWERS. ii) BACK TENSION ON THE TOWER WITH GUY WIRE SHOULD BE AVOIDED. iii) IF REQUIRED PREPARE A SCHEME AND GOT IT APPROVED BY THE TECHNICAL CELL. iv) GUY WIRE CAPACITY SHOULD BE 1½ TIMES OF MAXIMUM TENSION OF THE CONDUCTORS. v) INSPECT THOROUGHLY THE CONDITION OF GUY WIRES BEFORE USED. vi) GUY FIXING ANGLE SHOULD BE BETWEEN 45 o TO 50 o TO THE VERTICAL. vii) GUY BLOCKING ARRANGEMENT SHOULD BE VERY CAREFULLY DONE. viii) RESPONSIBLE PERSONS SHOULD BE DEPLOYED DURING ENTIRE SAGGING OPERATION. ix) MEN ON BACK STAY SHOULD BE PROVIDED WITH APPROPRIATE WHISTLE AND COMMUNICATION. x) MEN ON BACK STAY SHOULD BE IN CONSTANT TOUCH WITH FINAL SAGGING PERSON.
    • 53. xi) ANY WHISTLE OR COMMUNICATION FROM THE PERSON AT BACK STAY, STRINGING SHOULD BE STOPPED. xii) IF NECESSARY CONDUCTOR SHOULD BE RELEASED TO DE-TENSION. xiii) FINAL SAGGING SHOULD BE DONE AS PER APPROVED SAG TENSION CHART. xiv) ANY CHANGES IN THE SECTION, SPAN MADE DURING THE CONSTRUCTION THE SAG TENSION CHART SHOULD BE GOT CORRECTED. xv) THE PERSON IN-CHARGE OF FINAL SAGGING SHOULD HAVE COPIES OF FINAL PROFILES, SAG TENSION CHART, FINAL TOWER SCHEDULE, SAG TEMPLATE, PROPER RECORDING REGISTER, FORMATS, ALL DRAWINGS OF HARDWARE AND ACCESSORIES. xvi) TWO THERMOMETERS SHOULD BE CLAMPED ON THE TOWER IN ADVANCE ON THE SAG SPAN. xvii) TEMPERATURE SHOULD BE CONSTANTLY MONITORED. xviii) NECESSARY CORRECTION OF SAG BOARD SHOULD BE DONE BEFORE FINAL MARKING OF CONDUCTOR. xix) ADEQUATE AND PROPER COMMUNICATION SHOULD BE AVAILABLE AT ALL POINTS CONTROLLING SAG AND BACK TENSION POINT.
    • 54. xi) ALL EQUIPMENT SHOULD BE LOAD TESTED BEFORE FINAL SAGGING OPERATION PLANNED. xii) USE SUITABLE DYNAMOMETERS TO CROSS CHECK SAG, SHORTER SPAN, HILLY TERRAIN. xiii) CHECK CONSTANTLY EVENNESS OF THE BUNDLE CONDUCTOR. xiv) KEEP CONSTANT CHECK ON THE MOVEMENT OF AERIAL ROLLER TO ENSURE INTERMEDIATE SPAN ALSO REACHED TO DESIRED SAG. xv) IN CASE ANY CONDUCTOR IS PULLED ABOVE SAG IN THE SAG SPAN THEN RELEASE BOTH THE CONDUCTORS TO BRING DOWN BELOW SAG AND BRING EVENNESS AND THEN RE-SAGGED. xvi) AVOID FINAL SAGGING IN WINDY DAYS, OTHER WISE ALLOWANCE IS TO BE GIVEN FOR UPLIFT. xvii) ALLOWANCE GIVING IS NOT DESIRABLE SINCE IT DEPENDS ON THE WIND AND EXPERIENCE. xviii) SPECIFIC CARE SHOULD BE TAKEN IN MEASURING FINALLY SAGGED CONDUCTOR BEFORE CUTTING & COMPRESSING THE DEAD END CLAMP.
    • 55. i) KEEP THE CONDUCTOR FINALLY SAGGED FOR 48HRS ON ROLLER. ii) AGAIN CHECK THE SAG AND RE-ADJUST IT IF NECESSARY. iii) KEEP SUSPENSION STRING ABSOLUTE VERTICAL. iv) PLUMB MARK THE CONDUCTOR BEFORE REMOVING ROLLER BY MEANS OF A PLUMB OR PLUMB MARKER MADE FOR SPECIFIC PURPOSE. v) THEN THE CONDUCTOR SHOULD BE LIFTED BY MEANS OF A SUITABLE LIFTING DEVICE. vi) LIFTING DEVICE MAY CONSIST OF ONE OR TWO HOOKS DEPENDING UPON NUMBER OF CONDUCTORS. vii) AFTER LIFTING THE CONDUCTOR FIX PREFORMED ARMOUR RODS. viii) TAKE 2 OR 3 RODS ON EACH SIDE OF THE CENTRE MARK SUCH THAT THE HAND WILL NOT BE MORE THAN ONE OR TWO PITCH LENGTHS AWAY FROM THE CENTRE MARK.
    • 56. ix) THE CENTRE MARK OF THE RODS SHOULD BE LOCATED AT THE CENTRE MARK OF THE CONDUCTOR SUPPORT. x) APPLY THE RODS BY ROTATING ABOUT CONDUCTOR CONTINUING FROM 1 OR 2 PITCH LENGTH OF EITHER SIDE OF THE CENTRE. xi) FIX ARMOUR ROD APPLYING SPIRAL MOTION OF THE HANDS UNTIL THEIR ENDS ARE SNAPPED INTO POSITION. xii) FIX SUSPENSION STRING OVER ARMOUR ROD THEN RELEASE THE LOAD. xiii) CHECK THE INSULATOR ASSEMBLY IS IN PLUMB. xiv) INSTALL VIBRATOR DAMPERS OR SPACER DAMPERS AS PER DRAWING at 1.2 to 1.3 m xv) IF VIBRATION DAMPERS ARE USED THEN FIX THE LINE SPACER IMMEDIATELY THERE AFTER.
    • 57. i) ALLOW THE FINALLY SAGGED CONDUCTOR FOR 48HRS TO TAKE CARE THE CREEPAGE OR MINOR SAG ERROR DUE TO MOVEMENT OF AERIAL ROLLER. ii) LIFTING DEVICE SHOULD BE FIXED IN SUCH A MANNER SO THAT LIFTING LOAD IS TRANSFERRED TO TOWER BODY. iii) AVOID POINTED LIFTING LOAD ON THE TIP OF CROSS ARM. iv) LIFTING HOOK SHOULD HAVE A RUBBER OR NEOPRENE LINING. v) MATCH THE CENTRE OF THE ARMOUR ROD WITH CENTRE MARK OF THE SUSPENSION POINT. vi) FIX VIBRATION DAMPERS OR SPACER DAMPER IMMEDIATELY SINCE THE CONDUCTOR AT FULL LOAD / CRITICAL TENSION. vii) FIX LINE SPACER IMMEDIATELY FOR BUNDLE CONDUCTOR TO AVOID CLASHING OF CONDUCTOR.
    • 58. i) MEASURE THE EXACT JUMPER LENGTH REQUIRED FOR EACH TENSION TOWER. ii) CHECK THE JUMPER DEPTH, ANGLE AS GIVEN IN THE ELECTRICAL CLEARANCE DIAGRAM. iii) PRESS THE JUMPER CONE AND FIX ON THE TOWER. iv) WHILE FIXING JUMPER THE CONDUCTOR SHOULD BE EARTHED PREFERABLY ON BOTH THE SIDES. v) IN CASE OF BUNDLE CONDUCTOR RIGID SPACER SHOULD BE FIXED AS PER THE RECOMMENDATIONS OF MANUFACTURER.
    • 59. Statutory Inspection points: S. No. Location No. Type of tower Chimney Coping Missing bolt & nuts HR weld Insulators Arcing horns Jumper bolt & nuts Jumpers Vibration Conductor Earth wire Earth wire bonds Number plates Danger boards Phase plates Step bolt & nuts Protection wall Ground clearance Tree clearance Other remarks