Technology Focus

New Trends in Transmission Line

Towers

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Transmission Lines

Points covered

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Purpose of Transmission lines

Classification of Towers

Transmission Line components

New trends in transmission lines

Importance of Right of Way

Pictures of guyed & Chainette Towers

Some interesting video

Towers in Future

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1200 kV D/C India

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Transmission Lines

Purpose of transmission line towers

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Economy is becoming increasingly dependent on electricity as a basic input. Transmission lines provide the means of connecting the generating capacities to the load centers

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400 kV D/C Lines in Abu Dhabi

400 kV S/C Libya, Multi lattice Tower

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Transmission Towers

Classification of Tower

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Single circuit TowerDouble circuit Tower

Multi circuit Tower

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EHV Towers

High voltage towers

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800 kV HVDC towers in India

500 kV S/C tower in Georgia

400 kV D/C towers in Abu Dhabi

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View from beneath the tower 1200 kV D/C

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Transmission Towers

Suspension Towers

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Transmission Towers

Angle Towers

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Transmission Towers

Transposition Towers

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400 kV D/C Transposition tower in India

Transmission Towers

Tower Electrical Clearances

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Transmission Towers

Major Components on Towers

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Insulators

ConductorsGround Wire

Conductor

Insulator

Jumpering

Transmission Lines

New trends in transmission lines

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Mild steel to High tensile steel to Super High tensile steel

Ground Wire to OPGW

High Temperature Low sag conductors

Single circuit to Double Circuit to Multi circuit

Twin conductors to Quad bundle to Six bundle to Eight bundle conductors

Higher KV lines i.e., 800 kV HVDC, 1200 kV S/C & D/C and 765 kV D/C

Use of Google, GPS, Total work station and LIDER survey techniques

Use of PLSCADD for profiling

Use of Method-IV calculations for analyzing Tower on site condition

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1200 kV D/C India

Transmission Lines

New trends in transmission lines

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Use of 3 D software for detailing of Towers like BoCAD

Guyed Towers

Pole structures

Narrow based towers

Porcelain to Glass to Polymer Insulators

Auger Foundations.

Transmission cum Telecom towers

Erection of towers using Helicopters

Manufacturing & construction friendly towers

Environmental friendly Designs

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1200 kV D/C India

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Global Positioning Systems

(GPS)

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Detailed Survey using a GPS in Progress

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Recording the Readings in GPS

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TOTAL STATION

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Lider Survey

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Another view of a section of the Profiles and the Spotted Towers .

Transmission cum Telecom Towers-line commissioned in Texas, USA

Pole line on the Kabul Highway

Transmission Towers on Road

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A view of the Completed Line

through the Gorge

AUGUR TYPE FOUNDATION

Auger type foundations

- For information: Bauer GMbH (Germany)s anchordrill machines are suitable to drill up to 508mmdiameter bore.

- Truck Mounted Rigs E.g.: With Bauers TBG 12 Rig, up to 1300mm diameter bore (un cased) and 36.82m depth is possible.

Auger type foundations

Transmission Lines

Right of way

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Right of way width is important in the case of the following: Densely Populated areas Non-availability of required conventional

width of ROW High Cost of Land Forest areas To conserve flora and fauna Narrow constrained geography with no

other alternative

Right of way widths vary based on the voltage of the transmission line to be installed within the corridor.

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Transmission Lines

Strategies to conserve Right of way

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New transmission tower Designs for transferring bulk power and minimizing ROW i.e., 765 kV Double Circuit (D/C) & Multi Circuit (M/C), 1200 kV Single Circuit (S/C) and 800 kV HVDC (High Voltage Direct Current) towers. The side table mentions about ROW & capacity utilization of bulk EHV Transmission lines. By going for EHV transmission lines in the ranges of 800 kV & 1200 kV we are transferring maximum power per meter width of available corridor.

These days many Power utilities in India i.e., POWERGRID, SEBs & IPTCs are going for Double and Multi circuit lines instead of Single circuit lines to minimize ROW

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EHV Towers

Higher voltage towers

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800 kV HVDC towers in India

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1200 kV D/C towers in India

EHV Towers

1200 kV S/C tower under test

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Transmission Lines

Strategies to conserve Right of way

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Up gradation of existing lines by using Highthermal rating conductors: This method of upgradation of existing lines by high temp andlow sag conductors is becoming veryimportant particularly where ROW becomesvery important. Presently we are working onPOWERGRIDs project of upgrading of 400kVSiliguri-Purnea Transmission Line which ispassing through the Chicken neck area havingserious ROW constraints.

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Transmission Lines

High temperature and low sag conductors

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Various types of high temperature and low sag conductors in practice are: ACSS (Aluminium Conductor Steel

Supported) INVAR Conductor GAP Conductor ACCR (Aluminium Conductor Composite

Reinforced) ACCC (Aluminium Conductor Composite

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Transmission Lines

High temperature and low sag conductors

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These conductors can be operated at 200 C. Steel core (High strength) carries most of the load and hence less sag when compared to conventional ACSR conductor under high temperature.

High temperature low sag conductors can carry around 2.5 times the power capacity when compared to normal ACSR conductor.

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Transmission Lines

Eight & Six bundle conductors

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Eight Bundle conductorSix Bundle conductor

Environment Friendly designs

Environment Friendly designs

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Transmission Lines

Extended towers to avoid tree cutting

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Manufacturing Friendly Designs

Manufacturing friendly Designs i.e., reduction ofnumber of sections & avoiding bends which reducesinventory & lead time of procurement

Original Detailing with Four leg bend

Manufacturing Friendly Designs

Plan

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250x250x25 QH

Manufacturing friendly development without leg bend

Manufacturing Friendly Designs

Cross arm Without Bend

Manufacturing Friendly Designs

Construction Friendly Designs

Erection friendly designs

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500 kV S/C Angle towers in Kazakshtan

Construction friendlyDesigns i.e., erectable byhelicopter or heavy craneswhich changes currenterection methodologies toincrease the productivityin construction

Lifting points were specified in this project for tower lifting by helicopter.

To reduce the construction cost the numbers of joints were reduced.

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Guyed Towers

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Guyed Towers

V-Shaped Guyed Suspension Tower Ready for Erection

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Guyed Towers

V-Shaped Guyed Suspension Crane Erection

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Guyed Towers

V-Shaped Guyed Suspension Crane Erection

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Guyed Towers

V-Shaped Guyed Suspension Crane Erection

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Guyed Towers

V-Shaped Guyed Suspension Tower

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Guyed Towers

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Guyed Towers

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Guyed Towers

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Guyed Towers

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Guyed Towers

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Chainette Towers

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Chainette Towers

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Towers in Future!

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Thank You

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