INNOVATIVE SOLUTION FOR
LINE UPRATING

• It is becoming increasingly difficult to obtain ROW to install new
transmission line to cater the increased loads on existing lines.
• It may be noted inevitable concomitant of load increase is
geographical congestion.
• Geographical congestion would mean that the extra load can be
catered through smart solution of line uprating.
• This would require reconductoring of lines using High Performance
Conductor. However, this exercise is problematic as the shutdown
required for reconductoring cannot be provided as those lines which
are already critical.
• Use of ERS proved to be a vital solution for reducing the shutdown
time during reconductoring.
INTRODUCTION

• Sections (600 x 600 x 3000 mm) made of High Strength Steel
are both modular as well as portable.
• The columns are made of High Strength Steel instead of
Aluminium.
• High strength steel has three times the specific gravity and
yield strength of more than 2 times when compared with High
Strength Aluminium alloy.
• High Strength Steel make sure that there is no permanent
deformation on the structure due to compression.
ERS – EMERGENCY RESTORATION SYSTEM

• While designing, direct stress due to Vertical load, bending
moment due to transverse loading and broken wire
conditions are considered.
• Overturning moments due to lateral loads will result in
tension responses at the anchoring level.
• These are effectively resisted with the help of ground
anchors.
• Depending upon the soil condition, different types of
anchors shall be used.
LOADING

ANCHORING
CROSS PLATE ANCHOR Suitable for Normal Soil (dry)
SCREW ANCHOR Suitable for loose soil
ROCK ANCHORING Suitable for hard rock
RAY TYPE ANCHOR Suitable for soft soil
LARGE PLATE ANCHOR Suitable for Marshy soil

• Steel plates supported by I-Beam on each corner
provides enough strength and support to maintain a
lighter section and support GIN pole.
• Sections are modular and does not require any heavy
machineries for erection. With skilled manpower, the
tower can be erected within 3-4 hours.
• Use of guy wires takes the lateral load and negates the
need of civil foundation.
• Tower positions & Guy placements are pre-determined
with the use of design software PLS
LINE ANALYSIS

Experience obtained during two projects executed in Ghaziabad will be discussed in
the following sections.

CASE STUDY 1
GHAZIABAD: 132 kV LINE BETWEEN
VAISHALI AND SAHIBABAD

• Ghaziabad Development Authority
requested UPPTCL to re-route their
132 kV Transmission Line from Vaishali
to Sahibabad which was a hindrance
for completing their flyover project.
• UPPTCL decided to shift the line and
construct a multi circuit tower in place
of existing tower and also uprate the
line by changing the conductor from
ACSR to ACCC.
CASE STATEMENT

• Initial and detailed survey were made
before and after the award of contract.
• After detailed survey, the technical
team concluded that 3 ERS tower of
30M high will be required in view of the
multi storey mansions and residential
apartments.
• Erection works began on 21st April and
was finished by 27th April.
SURVEY

• After erection, we waited for the shutdown of 33kV
Line that was crossing the section between ERS 1
and Multi circuit as well as a 11kV Line that was
crossing the section between ERS 1 & ERS 2.
• In the meantime, stringing works were carried out
between ERS 2 and ERS 3.
• On 30th April, UPPTCL provided a shutdown of 33
kV Line for 2 hours within which the stringing work
between the Multi Circuit tower and ERS 1 was
done.
CHALLENGES
33 kV Line Crossing

• Later on, 1st May, shutdown on 11kV Line
was provided for 2 hours to complete the
stringing between ERS 1 & ERS 2.
• Stringing between ERS 3 and 132 kV tower
was delayed by 5 days due to non-
availability of shutdown.
• After the line is shifted to ERS, UPPTCL
dismantled the existing 132 kV Towers and
replaced them with Multi Circuit Towers.
CHALLENGES
11 kV Line Crossing

 Even after installing the ERS, we were
not able to string the line as UPPTCL
could not provide shutdown on the
132kV Line.
 This shows how critical that particular
line is and it would have taken years to
complete the project without ERS.
 Both the flyover project and line
uprating would have been on hold.
IMPACT

• No heavy machinery or earth movers were
introduced for execution of above, other
than for transportation.
• It is worthwhile to mention that, after
shifting the line to ERS, there was a
severe hailstorm but the tower withstood
the same without any damage to it.
• The bypass line is in charged state since
then serving utility customers who didn’t
have to undergo suspension of service.
OUTCOME

Live line from existing
to ERS tower
Live Line between two
ERS Towers
Tower with cross arm
& insulator

GHAZIABAD: 400 kV ATUR –
INDRA PURAM LINE
CASE STUDY 2

• A 400 kV Transmission Line between Atur
and Indira Puram, abandoned since March
2017 and was likely to remain idle for at
least three months, due to a line crossing
over 132 kV Single Circuit Transmission
Line between Loni and Mohan Nagar in
Uttar Pradesh.
• The bottom crossarm of 132 kV Tower was
at a height of 53m which didn’t provide the
necessary clearance required for stringing
the 400kV line.
• The situation was that the height of 132kV
tower has to be reduced and it required a
shutdown for 5 to 7 days which was not
possible.
CASE STATEMENT

• Our engineering team conducted a
survey and made a detailed report.
• This project was a huge challenge as
the particular corridor contains a
Highway crossing, River crossing and a
Flyover Crossing.
• After analyzing the detailed report, three
locations were chosen for ERS erection.
SURVEY

• Based on the experience from previous
project, new techniques were followed in
order to fasten the erection time.
• Also as the crew was experienced, the entire
erection was done in 3 days whereas the
previous work took 6 days.
• We did a challenging feat of taking the
bypass line across the highway without any
disruption of highway traffic even for a
minute
EXPERIENCE
Flyover Crossing

• On 7th June, UPPTCL provided a shutdown
for 3 hours within which we carried out the
stringing on ERS and destringing of 132 kV
Line.
• Again after installing the tower, there was
heavy rain and stormy wind but no damage
was made to the ERS.
• No heavy machinery or earth movers were
introduced for execution of above, other than
for transportation.
OUTCOME
River Crossing

OUTCOME

• This exercise helped in completing a project which would evacuate 580 MW line where
substantial investment was already made on 98% stretch of the line and associated
substation would have remained idle for indefinite period.
• Benefits of this exercise was higher than cost by exponential proportions.

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