Page 49 - ECLECTIC MARCH-2022 INSIDE PAGES_p2.indd
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uired to develop the technology and the fittings to Figure 4: Details of layers of co-axial cable
apply it in the field.
BARRIERS
TECHNICAL PARTICULARS FOR 240
MM2 THREE PHASE CO-AXIAL CABLE Three main technical barriers appeared in installation
of Co-axial cable in overhead mode. 1) The weight of
1. Speci cations: Generally conforming to IS 7098-1, IS the Co-axial cable is more than the existing overhead
398-4 mainline conductors so fittings to be developed to carry
the co-axial cable in overhead mode. 2) Junction box is
2. 1st Phase: to be designed where co-axial cable can be terminated
Material: Hard drawn Al Conductor conforming and authorized service cables can be branch out. 3)
IS 8130 Termination of co-axial cable at the junction box as well
Construction: Stranded compacted circular Class 2 as termination in pillar box is to be developed.
No and diameter of wires before compacting: 36/2.97
1st phase insulation thickness: 3.0mm PROOF OF CONCEPT
Diameter over 1st insulation: 24.1 mm
As a trial case, we had first converted one span of existing
3. 2nd Phase: overhead bare conductor network with unarmored 240
Material : Hard drawn Al Conductor conforming IS mm2 co-axial cable at Sapgachi 1st Lane of Tiljala Topsia area
8130-applied with right hand lay between Lp-95/18/1 and 95/18/0. No tapping or hooking
Construction : applied helically over the core was observed after conversion. On successful completion
(1st insulation) of the POC, we have introduced unarmored co-axial cable
No and diameter of wires before compacting: in overhead mode in several theft prone pockets.
20/3.9 mm Projects outcome (loss figure) lead us to implement
Diameter over 2nd insulation : 37.9 mm co-axial cable more and more in the theft prone areas.
4. 3rd Phase: Figure 5: Termination of co-axial cable at modified Pilar box
Material: Hard drawn Al Conductor conforming IS and junction box in POC
8130-applied with left hand lay
Construction: applied helically over the core (2nd
insulation)
No and diameter of wires before compacting:
39/2.8 mm
Diameter over 3rd insulation: 47.5 mm
5. Neutral:
Material: Hard drawn Al Conductor conforming IS
8130-applied with right hand lay
Construction: applied helically over the core
(3rd insulation)
No and diameter of wires before compacting:
68/1.5 mm
Diameter over neutral conductor: 50.5 mm
6. Cable net weight (approx.): 3740 kgs/km
7. Current carrying capacity: 310A (in air at 50 degree C)
49
apply it in the field.
BARRIERS
TECHNICAL PARTICULARS FOR 240
MM2 THREE PHASE CO-AXIAL CABLE Three main technical barriers appeared in installation
of Co-axial cable in overhead mode. 1) The weight of
1. Speci cations: Generally conforming to IS 7098-1, IS the Co-axial cable is more than the existing overhead
398-4 mainline conductors so fittings to be developed to carry
the co-axial cable in overhead mode. 2) Junction box is
2. 1st Phase: to be designed where co-axial cable can be terminated
Material: Hard drawn Al Conductor conforming and authorized service cables can be branch out. 3)
IS 8130 Termination of co-axial cable at the junction box as well
Construction: Stranded compacted circular Class 2 as termination in pillar box is to be developed.
No and diameter of wires before compacting: 36/2.97
1st phase insulation thickness: 3.0mm PROOF OF CONCEPT
Diameter over 1st insulation: 24.1 mm
As a trial case, we had first converted one span of existing
3. 2nd Phase: overhead bare conductor network with unarmored 240
Material : Hard drawn Al Conductor conforming IS mm2 co-axial cable at Sapgachi 1st Lane of Tiljala Topsia area
8130-applied with right hand lay between Lp-95/18/1 and 95/18/0. No tapping or hooking
Construction : applied helically over the core was observed after conversion. On successful completion
(1st insulation) of the POC, we have introduced unarmored co-axial cable
No and diameter of wires before compacting: in overhead mode in several theft prone pockets.
20/3.9 mm Projects outcome (loss figure) lead us to implement
Diameter over 2nd insulation : 37.9 mm co-axial cable more and more in the theft prone areas.
4. 3rd Phase: Figure 5: Termination of co-axial cable at modified Pilar box
Material: Hard drawn Al Conductor conforming IS and junction box in POC
8130-applied with left hand lay
Construction: applied helically over the core (2nd
insulation)
No and diameter of wires before compacting:
39/2.8 mm
Diameter over 3rd insulation: 47.5 mm
5. Neutral:
Material: Hard drawn Al Conductor conforming IS
8130-applied with right hand lay
Construction: applied helically over the core
(3rd insulation)
No and diameter of wires before compacting:
68/1.5 mm
Diameter over neutral conductor: 50.5 mm
6. Cable net weight (approx.): 3740 kgs/km
7. Current carrying capacity: 310A (in air at 50 degree C)
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