new trend on transmission power lines and related ... · 27 april 2017 8 large crossing means...
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27 April 2017 2
Several regions of the world are facing severe pressure on transmission line infrastructure, while the trends of the global energy system show a constant need for improving safety and quality of supply and an increasing impact of environmental issues.
How to improve Transmission Systems?
Background
27 April 2017 3
When the construction of a new line is possible, the trend isto give priority to EHV and UHV Power Lines, both AC &DC, in order to reduce the losses, both of them with largerand increased number of multiple bundle conductors (6 or8 bundle are pretty common on UHV).
Background
27 April 2017 4
When economic concerns and limitation on obtaining new right of ways for transmission line limit the growth of new lines, thesolution is upgrade or replace the existing transmission line, mainly by reconductoring with use of new generation HTLSconductors, and in some case by using new design of towers.
Background
27 April 2017 5
A “Smart Grid” must be primarily a “Strong Grid” !
RENEWABLE SOURCES
STRONG GRIDS
POWER LOSSES REDUCTION
EFFICIENT GRIDS CO2 reduction
Electricity is not always used in the same place where it is produced need for transmission and distribution systems on long distance, but they involve significant energy loss.
STRONG GRIDS
Capacity of long distance transport
Ability to manage variability of
renewable sources
In order to reduce these losses, the recent trend of countries with the higher rate of energy development is to give priority to extra high and ultra high voltage power lines (660-750-800-1000 kV-1100-1200 kV), many of which programmed to operate in direct current (DC).
Electrical systems powered by renewable sources are experiencing a strong development considerable difficulties in their expansion because of problems arising from delays and lacks of grid interconnection. Renewables high variability and instability of generation existing networks can manage only low levels of variability.
The great expansion of EHV-UHV Lines
27 April 2017 6
Stringing conductor with larger diameter
& Large Crossing Stringing Operation
Academy & Expertise Services
Easy transportation of stringing equipments
Stringing new generationHTLS conductors
Vicinity Works
Objective of equipment manufactures
27 April 2017 7
TEN
SIO
NER
2x50kN1500mm
2x140kN1900mm
2x70kN1700mm
2009630mm2
Ø34.7mm
2010720mm2
Ø36.2mm
2011900mm2
Ø40.6mm
2011/20131000mm2
Ø42.9mm
20141250mm2
Ø47.9mm
20161520mm2
Ø48.7mm
CON
DU
CTO
R
2x140kN1850mm
Stringing Conductors with large Diameter
27 April 2017 8
Large crossing means single spanof 1.5-2 km and above, as per largeriver crossing around the world, upto the fjord crossing, typical ofNorway, in which the single span canbe between 3 to 4 km.
In correspondence of the largecrossing, the bundle configurationof the line is sometimes shifted toa single conductor configuration,due to mechanical limits of theconductors and otherenvironmental reason, bringing theconductor size up to 55 to 60 mm.
Large Crossing Stringing Operations
27 April 2017 9
For new generation HTLS conductors the requirements from manufacturer for bull-wheels diameter are different depending onthe kind of conductor typology; bull-wheel diameter move from 35 times to 40, 42 and also 45, while for blocks it moves from20 to 26, 28 up to 31 or above.
9
ACSS ACCCACCR TACSR – ZTACSR GTACSR – GZTACSR ZTACIR
HTL
S CO
ND
UC
TOR
HTLS conductors are also very delicate on handling, due to the material selection, as soft annealed aluminum for outsidelayers and special alloy or composite core. They require care during stringing, in particular for the high fragility of the coreunder torsional loads.
Bull-wheels material must avoid any over-stress of the conductor under stringing.
Stringing new generation HTLS conductors
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1000 mm 1500 mm1200 mm
LARGE BLOCKSSTRINGING ROLLERS
Large equivalent radius
Hard bull-wheels surface is the optimalsolution, because the low frictionminimizes the torsional overstress andallow a smooth stringing operationpreserving the conductor integrity.
Stringing new generation HTLS conductors
27 April 2017 11
Normally:
large machines with big mass
easier transportation
fast and flexible positioning in the job-site
Easy transportation of stringing equipment: Truck Installed Machines
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Normally small or medium size machines, to be towed by regular vehicles or small trucks, as well as large machines, to be towed by dedicated trucks.
Easy transportation of stringing equipment: Machines with DOT trailer
27 April 2017 13
When the working area doesn’t haveany access road or doesn’t havepermission to made temporary road,the only solution is to fly the equipmentby helicopter. Machines are made ofdetachable part with weight allowed forthe specific helicopter to be used.
Easy transportation of stringing equipment: Detachable Helicopter Machines
27 April 2017 14
When the dimension of a machine will be larger than available traditional transportation resources, the equipments manufactures realized machines made by modular parts (normally operation unit and power unit); they are detachable machines not really for “weight” reason but mainly for “dimension” reasons.
Easy transportation of stringing equipment: Detachable Modular Machines
27 April 2017 15
The machines on each operational side are linked in parallel and electronically connected and synchronized; however, they are operated by one operator from one main control.
The modular machine concept is based on the possibility to link a series of stringing machines, both at the puller or tensioner side, allowing the stringing of a large number of ropes or conductors.
Easy transportation of stringing equipment: Detachable Modular Machines
27 April 2017 16
Vicinity works – The Traction Machine
Suitable for heavier operations, such as safety nets
Safe use even in live line conditions *
About 2 hours
Operating time reductionHIGH TRACTION FORCE
1,2 kN
TWO ELECTRICAL MOTORS
LONG LASTING BATTERY
HIGH SPEED 33 M/MIN
TMT020 can be controlled remotely up to 500 m during the
span crossing **
REMOTE CONTROL OPERATIVE RANGE
It can be used to replace both ground wires and conductors
CONDUCTORS DIAMETER RANGE:
10-46 mm
* Gasoline motors are dangerous because of the risk of fire caused by sparks generated in the tank and/or in the hoses.
** In case of longer distances or obstacles TMT020 can be controlled by a second unit placed in another location.
TRACTION MACHINE ADVANTAGES
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The high traction force available with the newest Traction Machine allow also to use it for the installation of larger weight elements, as protective nets to be installed over critical crossings, as railways or highways.
Vicinity works – Protective Nets Installation
27 April 2017 21
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