NEW TREND ON TRANSMISSION POWER LINES AND RELATED STRINGING

EQUIPMENT DEVELOPMENT

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

27 April 2017 10

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

27 April 2017 12

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

27 April 2017 17

Vicinity works – The Cradle Blocks

27 April 2017 18

Vicinity works – The Equipotential Area

27 April 2017 19

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 20

Academy & Expertise Services

27 April 2017 21

To be SOLUTIONS PROVIDER in the

market of infrastructure for the transport of Energy, Data and

MaterialTo be GLOBAL

with local presences

To provide EFFICIENCY,

CONNECTIVITY, SAFETY and

SUSTAINABILITY for the modernization of the infrastructures

of every country

Focus on INNOVATION,

INTERNATIONALIZATION and

INTEGRATION.Strong player in all technologies, across many geographies

and in alliance with the main market players

StrategyMissionVision

Vision, Mission & Strategy

www.tesmec.com