Preformed Armour Rods Performed armour rods suitable for ACSR conductors of the required size, diame
Fig. 15-I
TABLE 15-I
Sl. No. Code Name Dimensions in mm Nos. Per Set Wt/SET (Kg) Approx. ultimate strength Dia Length Over all Dia Tolerance 1. PANTHER 6.35 1930 33.3 +0, -51 11 1.9 9127 2. ZEBRA 7.87 2540 44.36 +0, -51 12 4.23 13316 3. MOOSE 9.27 2540 50.31 +0, -51 12 5.85 16250 4. DEER (Special) 6.35 2030 25.95 +0, -51 13 2.5 16414 (3) Ultimate Tensile strength : Not less then 35 Kg/mm2 (4) Conductivity at 200C :Not less than 40% IACS (International Annealed Copper Standard
(5) Slip Strength : Not less than 25% of UTS of Conductor.(2)Indian Standard to which PA rods shall conform:IS : 2121 (Part-I) - 1981
Fig. 15-II
TABLE 15-II
Code Name Dimensions in mm After Compression Approx Weight in Kgs Approx. Ultimate Tensile Strength A B C D Alum Steel Alum Steel Panther 610 38 203 18.0 32 15.1 1.10 0.28 9127 Zebra 711 48 241 19.2 40 16.1 2.00 0.37 13316 Moose 737 54 245 20.8 48 17.5 2.65 0.47 16250 Deer (Spl) 737 38 248 24.0 32 20.2 1.40 0.55 16464 (3) Ferrous parts Hot Dip galvanized : IS : 2633 (4) Slip Strength : Minimum 95% of UTS of Conductor (5) Minimum failing load : Not less than 95% of breaking strength of conductor (6) Electrical Resistance of the Joint : Not to exceed 75% of conductor resistance.(2)Indian Standard to which Compression:IS : 2121 (Part II) - 1981
Fig. 15-III
TABLE 15-III
Code Name Range of conductor Diameter (mm) Dimensions (mm) Approx Weight in Kgs Approx ultimate Tensile strength Minimum Maximum Length Before Comp. After Comp. Panther 19.56 21.79 241 38 32 0.43 9127 Zebra 28.14 30.17 279 48 40 0.63 13316 Moose 28.96 31.87 305 54 46 1.18 16250 Deer (Spl) 22.22 23.54 241 38 32 0.37 16464 (2) Indian Standard to which Repair Sleeves shall conform : IS : 2121 (Part III) - 1981 (3) Slip Strength : Not less than 95% of UTS of conductor. (4) Electrical resistance of the repaired portion expressed as % of the equivalent length of the conductor. : Not more than 15%.Fig.15-IV
TABLE 15-IV
For Conductor dia(mm) Dimension (mm) Weight of damper (Kgs) Bolt head hex. size (mm) A B 7 to 10 411 80 2.2 19 11 to 17 411 78 2.2 19 18 to 22 510 92 4.2 24 23 to 31 566 99 6.8 24 32 to 41 711 125 11.6 24 42 to 55 771 135 12.0 24 (2) Indian Standard to which vibration dampers shall conform : IS : 9708 (3) Slipping strength of steel messenger cable with clamp : Not less than 200 Kgs. (4) Maximum permissible dynamic strength : 150 microns (5) Minimum number of cycles for fatigue performance : Ten millions (6)Mass pull of strength which the balancing weights with-stand
: 500 Kg (7) Clamp slip strength : 250 KgFig.15-V
Dampers spacing for suspensions string is measured from centre of clamp and for tension string from mouth of dead end clamp.
TABLE 15-V
Conductor Code Spacing 'A' Meter Panther 1.14 Zebra 1.45 Moose 1.60 Spl. Deer 1.29Placement chart for the above conductors upto spans of 1200 Metres is given in detail at Table 15-VI on page 102.
Fig.15-VI
Fig.15-VII
The main body is an aluminium alloy (type LM 6061 or equivalent) tube of suitable length. The grip are fitted by crimping of the ends of the tube. The cushioned grip spacers are used on spacer, whereas rigid grip spacers are used on the jumpers. The cushioned grip is made of neoprene with aluminium inserts embedded in it, whereas rigid grip is made of aluminium alloy. The grip has groove of diameter suitable to the size of conductor. The cushioned grip spacers are provided with retaining rods of aluminium alloy (LM 6061) to provide uniformly distributed stress and also to avoid any pointed stress. The rigid grip have fixing arrangement with bolts, nuts and washers etc.
Fig.15-VIII
The main body, keeper and arms are made of aluminium alloy gravity die cast. The rubber bush is made of neoprene. The main body and arm at both ends are connected through neoprenes bushes. The arm has groove suitable to the size of conductor. The spacer dampers are fitted on conductors through arms and held with the help off keepers and bolts.
a) Longitudinal
+ 50 mm b) Vertical + 25 mmc) Torsional+ 507.Shore hardness of neoprene65-80 BHN8.UTS of retaining rods35 Kg/mm29.No. of retaining rods8 nos.10.RIV at 266 KV r.m.s.25 mmc) Torsional507.Shore hardness of neoprene65-80 BHN8.UTS of retaining rods35 Kg/mm29.No. of retaining rods8 nos.10.RIV at 266 KV r.m.s.
Not less than 500 microvolts
11.CoronaNot less than 320 KV r.m.s.11.CoronaNot less than 320 KV r.m.s.
(TABLE 15-VI)
Span(Metres) Damper Location in Metres 'PANTHER' ACSR 'ZEBRA' ACSR 'MOOSE' ACSR Tension (Kgs) up to Suspension Tension Tension (Kgs) up to Suspension Tension Tension (Kgs) up to Suspension Tension 1st Damper 2nd Damper 1st Damper 2nd Damper 1st Damper 2nd Damper 1st Damper 2nd Damper 1st Damper 2nd Damper 3rd Damper 1st Damper 2nd Damper 3rd Damper Up to 300 3500 1.15 - 1.15 2.30 4180 1.20 - 1.20 2.40 4500 1.30 - - 1.30 2.60 - 301-400 " 1.20 - 1.20 2.40 " 1.30 - 1.30 2.60 " 1.35 - - 1.35 2.70 - 401-600 " 1.20 2.40 1.20 2.40 " 1.30 2.60 1.30 2.60 " 1.40 2.80 - 1.40 2.90 - 601-800 " 1.25 2.50 1.25 2.50 " 1.40 2.80 1.40 2.80 " 1.45 2.90 - 1.45 2.90 - 801-900 - - - - - - - - - - " 1.50 3.00 - 1.50 3.50 - 901-1000 - - - - - - - - - - " 1.50 3.50 5.75 1.50 3.50 5.75 1001-1200 - - - - - - - - - - " 1.60 3.60 5.85 1.60 3.60 8.85
For 'Special DEER' being used for 220 KV River Crossings 2 Nos. Vibration dampers are used upto span of 850 metres and 3 Nos. for spans of 850 metres and above. The dampers are used on each side of tower at spacings 0.989 metres, 1.978 metres and 2.9675 metres.