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Fibres on OHL_rowland
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Transcript of Fibres on OHL_rowland
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1.1
Optical Fibres on Overhead Lines
EEPS 05
TRANSMISSION & DISTRIBUTION
PLANT
Dr Simon Rowland
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1.2
Products
OPGW, Optical ground wire
Wrap on phase or ground wire
Lash on phase or ground wire
MASS, Metallic self supporting
ADSS, All dielectric self supporting
OPPC, Optical Phase conductor
There are fewer options if bundled
conductors are present
}
}
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1.3
Fibre and cable system protection Moisture
Vibration (Aeolian)
External Mechanical Forces Installation
Service
Gunshot
Strain Wind and ice loading
Extreme Temperature Exposure Changes in ambient
Short circuit conditions
Lightning
Electrical
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Loose tube stranding
Helical stranding
SZ stranding
SZReversal point
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Tubing/Buffering Strain windowFibreStrain
-
+
CableStrain
+
Elongation
+0.5%-0.5%-
Contraction
Cable StrainWindow of 1% for
Fibre Strain=0%
Fibres touch
inside wallof tubesmicrobending
Fibres on
neutral axisof tubes
Fibres
touchouter wallmicrobending
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Tubing/BufferingWhat happens to attenuation?
CableStrain
+-
ElongationContraction
+0.5%-0.5%
Addedloss
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OPGW
Optical ground wire
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OPGW (Optical Ground Wire) OPGW replaces ground wire
Strength and electrical conductivity provided by metallic
strands: galvanised steel
Al-coated steel
Al alloy or Al
OPGW designed to have similar mechanical and thermalexpansion properties to cable it replaces
Strands are greased to prevent corrosion: 2 or 3 layers oftenused
At the rated fault current, optical cable temperature does notrise high enough to damage the optical core
Wire size chosen to resist lightning damage
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1.10
Fibral OPGW Design
Steel, Al, ACS wires
Aluminium C-section
Inner sheath
MDPE CSM
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1.11
Al or Al-Clad Steel wires
Galvanised Steel wires
Fibre in Steel Tubeelements
OPGW: Fibre in Steel Tube Fibres placed in laser-welded steel tube
Steel tubes never in external strand
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1.12
OPPC
Optical phase conductor
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1.13
Optical Phase Conductor (OPPC)
Same Cable Technology as OPGW Replaces one of the Phase Conductors
Special Fittings required to bring cablefrom Phase to Ground
Systems installed up to 150kV to date
Higher Voltages possible
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1.14
33kV OPPC system
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1.15
ADSS
All dielectric self supporting cable
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1.16
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1.17
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1.18
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1.19
In all cases aramid yarns provide the strength
Often the outer jacket is of a special tracking resistant material
Cable is non-metallic, may be installed on live system, reducinginstallation cost significantly
Also used as temporary repair
ADSS Cable Design
StrengthMember
InnerSheath
OuterSheath
Tape
wrap
Polyest
er filler
Loose BufferTubeOptical
Fibre
StengthMember
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1.20
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1.21
ADSS LIMITATIONS
Cable sits in Potential Field (between phases)
Induced Current on Cable Sheath
DRY BAND ARCING threat to cable integrity
In severe cases damages cable strengthmember
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1.22
Fields on ADSS
Clamp
Phase Conductor
Optical Cable
x
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1.23
Currents on ADSS
Volts
Current
zone 1 - 50mzone 1 - 50m
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1.24
DRY BAND ARCING
Moisture/Pollution
CABLE
Support
at Tower (Earth)
ARC
DRY BAND
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1.25
Wrap and lash
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1.26
Wrap and lash cable design
Up to 48f
Installed if earthwire replacement unlikely forseveral years
Installation rate: up to 20 km/week Live line application possible
Design to cope with short-circuit currents;
lightning; bird-peck & shotgun Cannot withstand severe mechanical attack
such as large birds and heavy shot
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1.27
Standard design :
Outer diameter 5.9 / 6.5 mm
Cable weight 28 / 34 kg/km
Fiber count up to 48
Standard design :
Outer diameter 5.9 / 6.5 mm
Cable weight 28 / 34 kg/km
Fiber count up to 48
Wrap cable Lash Cable
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1.28
Radio controlled lashing machineManual lashing machine
Lightweight installation machines
Easy transportation and transfer at the towers Extremely fast installation with helicopter support
Live-line installation
Lash Installation Technology
Helicopter support
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1.29
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1.30
Accessories : Tower Bypass The temporarily secured cable is routed
round the tower using a curved support and isthen secured permanently
Angledsupport tube
Cable
Tower bypass on C-framewith curved support + cable
Ground wire
Cable wrappedaround guide rod
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1.31
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1.32
Testing
Tensile
Vibration
Sheave
Lightning
Short circuit
Corrosion
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1.33
New LineorReplacement of Conductors
on Existing Line
No Groundwire
OPGWOPGW
Existing LineandNo Need for Replacement
of Conductors
OPPCOPPC
Groundwire
Lash or wrap
onPhase conductor
Lash or wrap
onPhase conductor
No Groundwire
Lash or wrapLash or wrap
ADSS or MASSADSS or MASS
Groundwire
Conclusion - The Choice