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THE USE OF TEMPORARY TOWERS TO OPTIMIZE THE COMPLETION

OF RECONDUCTORING AND TOWER REPLACEMENT OF 150 KV HIGH

VOLTAGE OVERHEAD LINES (SUTT)

Muhammad Iqbal

Sepuluh Nopember Institute of Technology, Surabaya, Indonesia

[email protected]

ABSTRACT

Transmission lines play an important role in the successful and stable operation and distribution of power

grids both for power evacuation from power plants and as a link from one Substation to another. The

construction of new transmission lines as a form of meeting high electricity needs in the current era of

Globalization has many obstacles, both in terms of rejection from residents, expensive licensing

arrangements, and very expensive investment costs. Reconductoring is one of the methods of increasing

transmission capacity at minimum cost with an adequate level of quality and reliability. Reconductoring

is the best solution today to increase conductor conducting capacity with the least investment and get

maximum economic efficiency. However, considering that reconductoring is an addition of transmission

capacity using old or existing lines and also requires tower replacement, so an outage with a long duration

is needed which is feared to have an impact on system reliability. Therefore, the use of emergency towers

is believed to be a solution to shorten the blackout time. Emergency towers are used as tools in

reconductor work and tower replacement. A study was conducted by calculating the Cost Budget Plan

(RAB) and schedule analysis using the Microsoft Project Application to determine the comparison of

the duration of time needed to complete reconductoring work and tower replacement between using an

emergency tower and without an emergency tower. From the time schedule made, it will be known which

work method uses a shorter duration of time so that it can save or speed up the blackout time. This study

is expected to produce a shorter schedule of reconductoring and tower replacement work using

temporary/emergency towers and with a smaller RAB compared to Total Operating Costs so as to

shorten the duration of the outage time at an efficient cost.

Keywords: Rekonduktoring, Tower Emergency, Speed up work

INTRODUCTION

PT PLN (Persero) is a company engaged in electricity, one of its activities is to build

electricity infrastructure, manage network construction activities, supervise construction and

carry out construction administration processes by acting as the owner of work (owner) and

Director of Work for PT PLN (Persero) Head Office contracts by producing quality networks and

ready to operate with processes implementation of development based on cost, quality and on

time (Aldi et al., 2022; Maidin et al., 2022).

150 kV Reconductoring Work is one of the electricity network projects built by PLN which

is one of the Government Programs in building national electricity. The Sukatani New-Sukatani

150 kV SUTT Reconductor Work is needed to be able to evacuate energy production from the

plant to the load, especially with the plan to build a Java 1 2x800 MW PLTGU with a radial

connection from GITET Cibatu Baru II / Sukatani and increase the reliability of industrial center

supply, especially to supply industrial estates on the north side of Karawang. The existing

conductor of SUTT 150 kV Sukatani New-Sukatani currently still uses Dove 1x298 mm2 with a

capacity of 600 A. This will certainly be a very crucial factor because this section will be used as

a power evacuation outlet from GITET Sukatani through GIS 150 kV Sukatani New towards

Sukatani-TX-Bekasi-Kosambi Baru so it must be reconductord because it requires a larger

conducting capacity (Kishore & Singal, 2014).

In order to support the plan of the 150 kV Sukatani Ne-Kosambi Baru SUTT Reconductor

work, it is necessary to carry out the 150 kV Sukatani New-Sukatani SUTT Reconductor work

first so that bottle necking does not occur on this path when evacuating power from PLTGU Jawa

1 2x800 MW.

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Construction work on the SUTT 150 kV Kosambi Baru-Sukatani reconductor as a

reinforcement of the GITET 500 kV Sukatani power evacuation outlet which will operate in 2022

(PT PLN (Persero) Unit Induk Pusat Pengatur Beban, 2019).

The configuration of GITET 500 kV Sukatani is to cut 2 circuits of SUTET 500 kV Muara

Tawar – Cibatu. GITET 500 kV Sukatani New outlet is GIS 150 kV Sukatani New whose

configuration plan cuts 2 circuits SUTT 150 kV Bekasi-Kosambi Baru (PT PLN (Persero) Unit

Induk Pusat Pengatur Beban, 2019).

The Reconductor Work of the 150 kV Sukatani New-Sukatani SUTT is targeted to be

completed in December 2022 considering that the 150 kV Sukatani New GIS will be operated at

the end of 2022 so that the evacuation of power from the Java 1 2x800 MW PLTGU through the

500 kV Sukatani GITET and the 150 kV Sukatani New GIS Step Down will be optimal.

This research will discuss the use of emergency tower tools to accelerate the completion of

the Sukatani New-Sukatani New-Sukatani 150 kV SUTT Reconductoring work compared to not

using emergency towers in order to pursue operating targets at the end of 2022 in accordance with

the Key Performance Indicator (KPI) targets set by management. Given that the tower on the line

is very old and has a conductor with a small capacity that is no longer suitable with the current

technological capacity, so the project is highly recommended by users to immediately reconductor

and replace the tower. In addition, this line is a crucial line that is currently very reliable to supply

electricity from Sukatani New to Sukatani and Kosambi Baru where when this work is carried

out, blackouts with too long a duration of time are not allowed (Mbuli et al., 2019; Reed et al.,

2020).

This reconductoring project is very closely related to blackouts so that in order to anticipate

and minimize the duration of long work time, an emergency tower method is needed so that it can

reduce the duration of time. So it is expected that the outage of the line will not be too long which

is feared to disrupt the need for electricity supply on the line.

RESEARCH METHOD

Data collection in this study was carried out by collecting information from a 150 kV

transmission reconductoring project at PT PLN (Persero) which is very useful for evaluating

overall time and cost optimization (Vadivel, 2017). This study requires several designs as

direction (guidance) in data collection so that the data obtained there is no doubt about its validity

and reality, as follows: Design Criteria for determining the type of conductor, Parameter Design,

namely by applying Operations Management such as human resources, cost budgets, conductor

materials, machines, methods; Experiment Design (Teniwut, 2022).

Data sources in this study use primary data, with field surveys, holding Group Discussions

(FGDs) to determine Decision Criteria, Cross Checking, Validity and Reliability. Secondary data

is data obtained from the results of collecting various previously existing data that will be used

by researchers to complement primary data that has been obtained, including contract document

books, Cost Budget Plans (RAB), data from other agencies such as contractors, construction

supervision consultants and other data related to the research topic. The variables that greatly

influence the optimization of project implementation time and cost are time variables and cost

variables (Kopsidas & Rowland, 2009).

Data processing, steps as follows: Create and Calculate Budget Plan (RAB) Contract

Amendment; Create a project comparison time schedule; Calculating the Cost Comparison Value

between the Amendment Budget and Total Operating Costs.

Data Analysis, After data processing is carried out both starting from making and

calculating the cost budget plan (RAB) for contract amendments, Primary Data, and Secondary

Data, the output is obtained in the form of comparative data, including: Cost Budget Plan Value

(RAB), and Time Schedule for the implementation of work, then these data are analyzed as a

reference in choosing which method is more effective and efficient in completing projects in

Research this time.

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Drawing conclusions and suggestions, The last step includes the analysis obtained from the

results of data processing carried out during the research and the results of analysis and discussion

can be concluded as the results of the research as a whole.

RESULT AND DISCUSSION

Field Data

The project reviewed in this study is one of the Network Transmission Reconductoring

projects at PT PLN (Persero) SUTT 150 kV Sukatani New towards Sukatani 4-CIRCUIT OHL 2

X TACSR 410/67 mm2 (Krishnasamy et al., 1981; Riba et al., 2020; Schweiner et al., 2003).

The Cost Budget Plan and time schedule for the project can be seen in the following

explanation.

Data Analysis

This analysis will explain how the Microsoft Project program can be used to speed up

outage times with variations using Temporary/emergency Tower, with the following stages :

1. Drawing up a project schedule and cost plan (Wale et al., 2015),

2. Acceleration of project blackout time with variations using Tower Emergency. Then the

result of accelerating the blackout time with variations using Tower Emergency is in the

form of changes in costs before and after using Tower Emergency compared to the duration

of the outage.

Creating Project Schedules and Costs

The steps in creating a project schedule by using the Microsoft Project program can be

done as follows (Harefa, 2021):

1. Open a new worksheet Click the Start button > Microsoft Office > Programs > Microsoft

Project

2. Enter the project's effective date.Enable the Project > Project Information menu. In the

Project Information dialog box, Schedule From : Project Start Date is selected, then enter

the project's effective date, which is August 1, 2022 in the Start Date box. These steps can

be seen in Figure 1 below.

Figure 1

Enter the Project's Effective Date date

3. Create a work schedule to determine working days and hours. This project uses a typical

calendar workday of 7 working days per week with 8 hours of work per day. Enter the data

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on the number of working days and hours in the Microsoft Project program, first click the

Tools menu > Change Working Time > Work Weeks > Details then in the select day(s) box

select all days then select Set day(s) to these specific working times. Next, enter the working

hours in the Form boxes: 08.00 To: 12.00 and Form: 13.00 To: 17.00 > OK. Then on the

Work Weeks view select Options, fill in the data in the Default start time box: 08.00; Default

end time: 17.00; Hours per day: 8.00; Hours per week: 56.00; and Days per month: 30.

Langkah-langkah tersebut dapat dilihat pada Gambar 2, Gambar 3, dan Gambar 4 berikut

ini:

Figure 2

Enter workdays and working hours

Figure 3

working hours per day, working hours per week, and working days per month

4. After all project preparation and determination of the calendar of working days and hours,

the next step is to compile data on project activities consisting of all work items that form

the sequence of the entire series of activities. Work items in project activities are performed

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5. in the following steps: From the View menu> click Gantt Chart > in the Task Name field,

enter the name of the entire series of work activities, in the Duration field, enter the time

duration of each job. Then create relationships between work items entered in the

Predecessors column, after the Task Name, Duration, Predecessors columns have all been

filled then the Start and Finish columns will be automatically filled with the right display

showing the results in the form of a Gantt Chart according to the data entered. The results

can be seen in Figure 4 below.

Figure 4

Work Item Creation with Gantt Chart view

Acceleration of Blackout Time with Variations Using Tower Emergency

The acceleration of project blackout time with variations using Tower Emergency is carried

out by filling in Tower Emeregency data which is then compared with normal conditions, namely

conditions before acceleration. The steps at this stage include::

1. In the Gantt Chart view, add Tower Emergency work items and data

2. Enter the duration of a work item as planned

Figure 5

Enter the Effective Date of the Project by using the Temporary Tower

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3. Entering project activity data using Tower Emergency

Figure 6

Creation of Work Items with Temporary Tower with Gantt Chart display

Discussion

Project Acceleration to Reduce Outage Time Duration

Following up on a request from the Load Control Unit that in order to maintain the

reliability of electricity supply in the Java system, it is necessary to accelerate work related to the

blackout of existing lines. In this research, of course, it can be done using the Temporary Tower

tool (Ahmed & Saqib, 2020; Ines & Ammar, 2020).

Shortening the duration of outage time is the main point in the implementation of this

reconductor project. With a relatively shorter duration of blackouts, it can maintain the reliability

of the electricity system on the island of Java. The following is a comparison of the calculation

of the duration of the outage time between without using a temporary tower and using a temporary

tower.

Acceleration Measures

The acceleration steps in the reconductoring project plan are described as follows (Rashmi et al.,

2017; Reddy & Chatterjee, 2016).

1. Without Using Temporary Tower

Conditions if the reconductor work is carried out without using a temporary tower, then the

blackout time of this reconductor project is 148 days. These activities cannot be accelerated,

because the system must be completely extinguished during erection work T.04 and Uprating

work of existing Towers T.76, 77 and 78 in the direction of Sukatani.

2. Working Method Without Using Tower Emergency. Stages of Work Implementation :

a) 148-day blackout permit for erection work T.04 up to uprating work T.76, 77, and 78

b) Mobilization of Manpower and Equipment to tower point T.04

c) Work began with dismantling conductors, fittings & accessories, towers, up to the

foundation of the existing tower footprint (T.76, 77, and 78)

d) After the existing tower dismantling work until the foundation is completed, the

foundation material curtain work and the new T.76, 77, and 78 foundation work continue

e) Continued curtain and erect tower work T.76, 77, and 78 after a concrete curing period

of ± 8 days

f) After the erect tower work was completed, the work continued to pull Line 1 conductors

from T.04 to T.75E

g) After the Line 1 conductor has been installed, continue to draw the Line 2 conductor

Line

h) Finished the work of pulling Line 1 and 2 conductors, continued the implementation of

Rele Line Diff installation work at GI Lawan, then carried out Individual test &;

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Function work, SAS Integration and Testing &; Commisioning at GI Sukatani Gobel

and GIS Sukatani New

i) After the Testing & Commissioning Work is completed, the Point to Point, Stability Line

Diff and Intertrip exams continue

j) Continued issuance of RLB and Energize direction Sukatani Gobel.

3. Dengan menggunakan Tower Emergency

The acceleration step in question is to shorten the blackout time in the work produced

by the previous stage, which is the normal stage. The calculation of acceleration needs using

the Temporary Tower inputted under normal conditions led to a reduction in project blackout

time from 148 days to 16 days. This acceleration caused the project cost requirement to

experience an additional cost of Rp 1,872,217,454 from the original plan cost.

4. Working method using Temporary Tower

Stages of Work Implementation :

a) Mobilization of Manpower and Equipment to the point tower T.04

b) Blackout permit for 14 days from Erection work to Cut joint work

c) Complete erection work at T.04 and perform final check

d) Line up conductor from direction T.03 to T.04 3 phase up line direction Bekasi and

continued 3 phase down direction sukatani gobel.

e) Thorough checking of the strength of tower members, tower body and cross arm as well

as bolt fittings accessories

f) Ensuring the strength condition of the T.79E to avoid chronic damage

g) If the condition of T.79 is still strong, the cut join work can be started by unclamping on

T.79 and installing the roll

h) The work of erecting the Temporary Tower along with the work of Mobilizing Manpower

and Equipment to the tower point T.04

i) Established 3 temporary tower points with sekur reinforcement

j) Install insulators and accessories at the end of the crossarm temporary tower and roll

mounted

k) Carrying out a new cable withdrawal 2xTACSR 410 in the Temporary Tower from T.75E

to T.04

l) After erection T.04 is complete, new cables are clamped in T.04 and in T.75E

m) The conductor in T.04 will be cut, which is from the direction of Sukatani line, the

temporary tower is placed in the lower 3 phase crossarms and the one from Bekasi

direction is in the upper 3 phase crossarms

n) Carry out Rele Line Diff installation work at GI Lawan, then do Individual test &;

Function and Testing &; Commisioning work

o) After the Testing & Commissioning Work is completed, the Point to Point, Stability Line

Diff and Intertrip exams continue

p) Followed by the issuance of RLB and Energize Line 1 in the direction of Sukatan

q) After the work of cutting the connection of T.04 and Energize Line 1 in the direction of

Sukatani Gobel, the work on uprating the existing towers T.76, 77, and 78 can begin

r) Pekerjaan dimulai dengan dismantling konduktor, fitting & accessories, tower, sampai

dengan pondasi tapak tower eksisting

s) After the existing tower dismantling work until the foundation is completed, the new T.76,

77, and 78 foundation work continues

t) Continued curtain and erect tower work T.76, 77, and 78 after a concrete curing period of

± 8 days

u) After the erect tower work was completed, the conductor withdrawal work continued from

T.04 to T.75

v) Furthermore, the permit went out for 2 days for the transfer of conductors from the

temporary tower to towers T.04, T.76N, T.77N, T.78N and T.75E

w) After Line 1 and Line 2 conductors have been installed in T.04, T.76N, T.77N, T.78N and

T.75E, Stability Line Diff and Intertrip tests are carried out

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x) Continued issuance of RLB and Energize Line 2 and Line 1 in the direction of Sukatani

Gobel.

Changes in Outage Time Duration

The duration of time under normal conditions or if reconductor work is carried out without

using a temporary tower requires a blackout time of 148 days, while if using a temporary tower,

a shorter blackout time is obtained, which requires a blackout time of 16 days. So from the results

of the analysis that has been done in this study there was a decrease of about 132 days or about -

89%.

Figure 1

Outage Time Comparison Model Between Using Temporary Tower and

Without Temporary Tower

Cost Comparison Before and After Using Tower Emergency

A significant decrease in the duration of the blackout time of 89% if the reconductor work

is carried out using temporary towers has an impact on increasing project costs. The results of the

comparison between the cost of normal conditions without using a temporary tower with the cost

to shorten the duration of the outage time if reconductoring is carried out using a temporary tower

shows that there is an additional cost. But the required duration of the outage became faster by

132 days. This means that it is still better because the additional cost of Rp. 1,872,217,454 is still

smaller than the loss received by PLN if this reconductoring work cannot be completed.

CONCLUSION

Based on the data, the results of the analysis and discussion conducted in research on one

of the Network Transmission Reconductoring projects at PT PLN (Persero) SUTT 150 kV

Sukatani New towards Sukatani, can be concluded as follows :

Comparison of the duration of the blackout time if the reconductor work is carried out

without using a temporary tower, then the blackout time of this reconductor project is 148 days.

These activities cannot be accelerated, because the system must be completely extinguished

during erection work T.04 and Uprating work of Existing Towers T.76, 77 and 78 in the direction

of Sukatani. Meanwhile, if you use a temporary tower, you get a much shorter blackout time,

which requires a blackout time of 16 days. So that from the results of the analysis that has been

done in this study there was a significant decrease of about 132 days or about -89%.

The duration of the contractual implementation time also has a faster impact if the

reconductor work is carried out using a temporary tower where if the reconductor work starts on

August 1, 2022, the work can be completed on December 26, so that the 2022 KPI target can be

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achieved. Meanwhile, if the reconductor work is carried out without using a temporary tower, the

new work can be completed on January 10, 2023, causing the KPI for 2022 not to be achieved.

Shortening the duration of the outage time if reconductor work using temporary towers

causes the project cost requirement to increase by Rp 1,872,217,454 from the original plan cost.

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