And., Intl.,J., Appl Sci., Eng., Tech, Vol 02, No 02, July 2022
e-ISSN: 2797-0442
RELIABILITY DISTRIBUTION SYSTEM ON LOAD BREAK SWITCH
ADDITION AT PT. PLN (PERSERO) ULP LANGSA CITY USING RIASECTION TECHNIQUE COMBINED METHOD ON ETAP 14.1.0
Arnawan Hasibuan1, Andik Bintoro2, Salahuddin3, Rizka Dwi Meutia4
1234
Department of Electrical Engineering, Faculty of Engineering, Malikussaleh University, Lhokseumawe,
Indonesia
Abstract— PT. PLN (Persero) ULP Langsa city is one part of UP 3 langsa, the LS-05 feeder in section
two is the location for placing several office buildings. Continuity stable distribution of electrical energy is
one of the most important aspects in the distribution system. Based on these problems, the writer was
inspired to consuct research with the aim of testing the reliability of the feeders LS-05 and LL-4 which was
installed with LBS manuver motorized at both ends of feeders. The LS-05 feeder with section method
SAIFI value is 2.2739 times/ customers/ year and SAIDI Value is 8.41995 hours/ customers/ year. For LL4 feeder witsh the same method SAIFI value is 2.28905 times/ customers/ year, then using RIA-Section
technique combined method, LS-05 feeder have SAIFI value is 2,0219 times/ customers/ year, SAIDI value
is 8,3082 hours/ customers/ year, LL-4 feeder have SAIFI value is 2.6574 times/ customers/ year and SAIDI
9.3008 hours/ customers/ year. This value indicates thet these two methods have succeeded in showing a
reliability index is in accordance with SPLN due to the addition of LBS motorized.
Keywords: SAIFI, SAIDI, RIA-Section, and LBS.
This article is licensed under the CC–BY-SA license.
1.
Introduction
Continuity stable distribution of electrical energy is one of the most important aspects in the
distribution system, to distribute electrical energy, PLN must use switching devices in network. Such as
air break switch, recloser, and load break switch. PT. PLN (Persero) ULP Langsa city is one part of UP
3 langsa, the LS-05 feeder in section two is the location for placing several office buildings, such as the
BNN building, the inspectorate office building, the agricultural building, then in section three there is
the ummi hospital building, and BPJS.[1] Therefore the distribution of electricity must be stable in that
feeder, to reduce the outage area and the number of customer disturbance then on the feeders LS-05 and
LL-4 which was installed with LBS manuver motorized at both ends of feeders.[2]
The addition pf load break switch wich is integrated with SCADA as a remote control system to
regulate the supply of electrical energy to the distribution system when a disturbance occurs from feeder
of LS-05 to LL-4 for load maneuvering. [3]To carry out this research, the author uses the combined
method (RIA-Section Techniqueby combining the parameter of the momentary failure rate and
parameters of the sustained failure rate. Where the parameter of the sustained failure rate pays attention
to the temporary failure rate, so that the result are close to the reality on the job.[4]
Received:July 2,2022 , Revised:July 10,2022 , Accepted:July 16,2022
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2.
Method
The electric power system stars fro the transmission stage to distribution to custumers. Such as
the power system components can be divided into five primary levels or subsystems, as shown in Figure
1 below:[5]
Transmission
lines
Generator
Primary
distribution
lines
Secondary
distribution
lines
Electrical
load
customers
Figure 1. Power System Components
The electric power distribution network is the part of the electric power system that deals
directly with customers. [6]This system consist of a medium voltage distribution system and a low
voltage distribution system. [7] In delivering electric power to consumers from load center, an electric
power distribution system must be adapted to local conditions by taking into account factors, future
developments, constraints, and economics.[8]
In this study, the author will calculate the reability index value using the RIA-section technique
method, then the network configuration index will be compared according to SPLN standard, as shown
in the table 1 below[9]:
Table 1. reability index value based on SPLN
Value
Radial SUTM
3.2 times/year
Radial SUTM
with PBO
2.4 times/year
SKTM without
SKTM with
PPJD
PPJD
1.2 times/year 1.2 times/year
SAIFI
SAIDI 21 hours/year
12.8 hours/year
4.36
hours/year
3.33
hours/year
Based on SPLN no.59 of 1985 wehere for each component in a distribution network system has
a standard failure rate and component reapir time, as shown in the table 2 below:[10]
Table 2. standard failure rate and repair time SPLN no.59 of 1985
component
Sustained
failure rate
Momentary
failure rate
r
(hours/year)
1
SUTM
0.2
0.003
3
2
SKTM
0.007
0.003
10
3
Transformator
0.005
0.003
10
4
FCO (Fuse
Cut Out)
0.003
0.003
0.25
5
Recloser
0.005
0.003
10
NO
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6
PMT
0.004
0.003
10
7
LBS
0.003
0.003
10
Based on the failure rate and repair time in SPLN no. 59 of 1985 then the data will be used to
calculate the reliability of component repair time in each section. Section technique method where
this method is assessed simple and can simplify the calculation of the reliability index.The working
principle is by dividing the network structure into several parts in analyzing the system, and each
section has its own calculation. [11]The results of each section will be added up be the final result
of the system reliability index. However, in his calculations, the methodThis section technique only
uses the failure rate commonly used for each system components, namely the sustained failure rate
(failure rate with repair intervals) long enough). [12]
RIA Reliability Index Assessment method is a method that predict disturbances in distribution
systems based on system topology and reliability components, RIA records failures that occur in
equipment caused by temporary interruption.[13] The weakness of the RIA method is that it only
calculates reliability caused by a temporary disturbance. Calculation on method combined method,
namely by combining the momentary failure rate parameters in the the calculation. Where the
calculation of the momentary failure rate is obtained by using RIA method. [14]The RIA method is
used to capture the failure rate caused by temporary disturbance (momentary failure rate), so that
the final result of this method is more close to the actual results in the field. The combination of the
Section Technique and RIA methods is actually combines the parameters of the sustained failure
rate (failure rate with repair interval quite a long time) contained in the Section Technique method
with momentary parameters failure rate (failure caused by temporary disturbances) contained in the
method RIA. This merger is expected to cover the shortcomings of the RIA method which only has
a parameter of momentary failure rate.In addition, this method of merging is expected can meet or
approach PLN standards to achieve World Class Service (WCS), the formula is below[15]:
ΛLP
= Sustained Failure rate x channel length
(1)
ULP
= Λsustained x repair time
(2)
SAIDI
= NLP x ΛLP / Nsection
(3)
SAIDI
= NLP x ULP / Nsection
(4)
ENS
= [ energy not supply kw x time (h) ]
(5)
Information :
ΛLP : value of failure rate
ULP : value of repair time
3.
Result and Discussion
From the data general from feeder LS-05 and LL-4, it can be simulated using ETAP 14.1 software,
which consist 1 power grids from each feeder, feeder LS-05 serves 30 transformers, feeder LL-4 serves
22 transformers, and 6 section LBS an 1 maneuver of LBS. Below is an image generated from the ETAP
software.
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Figure 2. Single Line Diagram LS05-LL4
The picture above is a single line diagram Feeder LS-5 and LL-4 before LBS maneuver is
installed. This single line diagram is used to simulate several scenarios of disturbance value to the
feeder.
Division of section on the feeder
The number of customers for the LS-5 feeder in section one is 373 customers with 3 distribution
transformers, in the second section there are 1,579 customers with 15 distribution transformers, in the
third section there are 997 customers with 12 distribution transformers, if the total number of customers
is on the LS-5 feeder are 2,449 customers with a total distribution transformer of 30 transformers. The
division of section on the LS-05 feeder is shown in the table below[16]:
Table 3. Section divion LS-05
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
60
Trafo
LSA-571 RENGGALI
LSA-393 PERTANIAN
LSA-522 PJR
LSA-27 LHOKBANI
LSA-687 PERUM TONY
LSA-223 PERUM ALFATIH
LSA-513 BTN POLRI
LSA-392 BNN
LSA-201 SPBU
LSA-422 BTN ASAM MERA 2
LSA-383 BTN ASAM MERA 1
LSA-333 LANGSA KUPI
LSA-438 KTR.INSPEKTORAT
LSA-252MASJID LOR.KB
LSA-544 LOR.KB
LSA-381 LOR.TPI
LSA-465 SAMSAT
LSA-24 SLB
LSA-347TKMTG.SEULIMENG
LSA-614 PERUM M.K
customers
149
75
149
149
25
25
149
75
149
75
149
149
37
149
149
149
1
149
120
50
Normal
power (KVA)
80
40
80
128
40
40
80
40
80
40
80
80
20
80
80
80
20
160
80
80
Section
division
Section 1
Section 2
Section 3
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21
22
23
24
25
26
27
28
29
30
LSA-537 RADIO GIPSI
LSA-211 BTN SEI PAUH 1
LSA-98 BTN SEI PAUH 2
LSA-337 PERUM PUSONG 1
LSA-331 PERUM PUSONG 2
LSA-249 BTN SEI PAUH 3
LSA-632 MUQ.WAHYU RIZKI
LSA-285 MUTIA RESIDENCE
LSA-455 RS.UMMI
LSA-281 BPJS KESEHATAN
75
239
75
75
149
75
3
40
95
1
40
128
40
40
80
40
128
40
80
80
The LL-4 feeder in the first section has 821 customers with 5 distribution transformers, in the
second section there are 1,284 customers with 5 distribution transformers, in the third section there are
969 customers with 11 distribution transformers, the LL-4 feeder has a total of 3,074 customers with
22 transformers distribution. The division of section on the LL-04 feeder is shown in the table below.
Table 4. Section divion LL-4
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Trafo
Customers
LSA-447 Tugu LSA
LSA-200 Simp. 3 kampung blang
LSA-495 blang seunibong rel II
LSA-345 Blang seunibong rel I
LSA-346 Dr. Jepang kp.Blang
LSA-542 Kp.Blang II
LSA-16 Kp. Blang I
LSA-453 Alue berawe
LSA-129 alue Berawe II
LSA-332 Pukesmas Langsa Kota
LSA-84 Simpang Kw.Langsa
LSA-560 Kuala Langsa I
LSA-382 Kuala Langsa II
LSA-199 Simp 3 BTN Sei Pauh
LSA-389 Ktr Geuchik Sei Pauh
LSA-104 Kim 3
LSA-128 Kim 5
LSA-329 Perum Pusong Kuala
LSA-121 Mesjid Kuala
LSA-631 Kuala KM 8
LS0A-340 TPI Kuala
LSA-118 Pelabuhan Kuala
149
299
149
75
149
149
299
299
149
149
239
149
149
75
70
75
75
75
149
75
3
74
Normal power
(KVA)
100
200
100
50
100
100
200
200
100
100
160
100
100
50
50
50
50
50
100
50
200
160
Section
division
Section 1
Section 2
Section 3
After performing calculations on the two feeders using the section method and also the
combined RIA-section method, the results of the two feeders were found as shown in the table below:
Table 5. reability index LS-05 feeder with section method
SAIFI
SAIDI
ENS
2.2739
8.41995
6
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Table 6. reability index LS-05 feeder with combined method (RIA-Section)
SAIFI
SAIDI
ENS
2.0219
8.3082
6.0934
The comparison of the reliability index of the distribution system according to the PLN standard
(SPLN 68-2) in 1986 above can be seen as the bar chart below.
DIAGRAM PERBANDINGAN INDEKS
KEANDALAN SISTEM DISTRIBUSI
PENYULANG LS-05
SAFI
21
SPLN
8.3082
Gabungan
8.41995
3.2
2.0219
2.2739
Section Technique
SAIDI
Figure 3. LS-05 feeder distribution system reliability index comparison chart
Like the blog diagram above, we can analyze the reliability index value of the distribution
system in the section method with the value of the sustained failures rate, which we can see in table 3.2
above, which shows a SAFI value of 2.2739 times/customer/year, then in the combined RIA-Section
method. with the addition of the momentary failures rate of 0.003 according to the PLN standard, getting
a result of 2,019 times/customer/year (in 2020 with 6 feeder interruptions) there is a decrease of 0.2549
and it is still in accordance with the PLN standard.
Likewise with the SAIDI value in the section method of 8.41995 hours/customer/year, the
combined method of 8.3082, a decrease of 0.1117 hours/customer/year is still very far from the PLN
standard SAIDI limit which states that these two methods have successfully demonstrated achievement
of the distribution system reliability index. calculations LL-4 feeder using the section method and also
the combined RIA-section method, the results were found as shown in the table below:
Table 7. reability index LL-4 feeder with section method
SAIFI
SAIDI
ENS
2,28905
8,48047
10,3253
Table 8. reability index LL-4 feeder with combined method (RIA-Section)
SAIFI
SAIDI
ENS
2,6574
9,3008
11,6606
The comparison of the reliability index of the distribution system according to the PLN standard
(SPLN 68-2) in 1986 above can be seen as the bar chart below.
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DIAGRAM PE RB ANDINGAN INDE KS
KE ANDAL AN S IS T E M DIS T RIB US I
PE NYUL ANG L L -4
SAFI
21
SPLN
9.3008
Gabungan
8.48047
3.2
2.6574
2.28905
Section Technique
SAIDI
Figure 4. LSL-4 feeder distribution system reliability index comparison chart
Like the blog diagram above, we can analyze the reliability index value of the distribution
system in the section method with the value of the sustained failures rate that we can see in table 3.2 in
chapter 3 above, the SAFI value is 2.28905 times/customer/year, then the combined method RIASection with the addition of a momentary failures rate of 0.003 according to the PLN standard gets a
result of 2.6574 times/customer/year (in 2020 with 12 feeder disturbances) there is an increase of
0.36835 but it is still in accordance with the PLN standard.
Likewise, the SAIDI value in the section method is 8.48087 hours/customer/year, the combined
method is 9.308, an increase of 0.8272 hours/customer/year is still very far from the PLN standard
SAIDI limit which states that these two methods have succeeded in showing the achievement of the
index. reliability of the distribution system in both feeders.
4.
Conclusion
Based on the results of the calculation of the reliability of the LS-4 and LS-5 feeders which are
installed with LBS maneuvers at both ends of the feeder using the combined RIA-section method, the
following conclusions can be drawn:
1. The SAIFI value for the LS-5 feeder using the section method is 2.2739 times/customer/year and the
SAIDI value is 8.41995 hours/customer/year. For LL-4 feeders, the SAIFI value is 2.28905
times/customer/year and the SAIDI value is 8.48047 hours/customer/year.
2. The RIA-Section Combined Method with the addition of a momentary failure rate parameter of 0.003
decreased the SAIFI value on the LS-5 feeder by 0.2549 to 2.0219 times/customer/year, and SAIDI
decreased by 0.1117 to 8.3082 hours/customer/year. In contrast to the LS-5 feeder, which has decreased
in SAIDI and SAIFI values. in the LL-4 feeder, the reliability index using this combined method
increased for SAIFI value increased by 0.36835 to 2.6574 times/customer/year, the SAIDI value
increased by 0.8272 to 9.308. This difference can occur because the LL-4 feeder has a longer
distribution channel and has more customers than the LS-5 feeder.
3. The frequency and duration of disturbances in the system are not only affected by sustained
interruptions in the section method, but also be affected by momentary interruptions.
4. Based on the final results of each method used, it can be seen that with the addition of LBS which is
installed maneuverably for the LS-5 and LL-4 feeders which maintains the stability of the distribution
of electricity, it also reduces the blackout area and time of blackout on both feeders.
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