Analysis of Breaking Capacity Calculation on Busbar Room Panel at PT Trias Indra Saputra

(1)

Print ISSN 2777-0168| Online ISSN 2777-0141| DOI prefix: 10.53893 https://journal.gpp.or.id/index.php/ijrvocas/index

44

Analysis of Breaking Capacity Calculation on Busbar Room Panel at PT Trias Indra Saputra

Herman Yani

^*1

, Nur Aminah

²

, Nofiansah

¹

, Monica Oktarani

³

1Department of Electrical Engineering, Politeknik Negeri Sriwijaya, Palembang, Indonesia

2Department of Electrical Engineering, Politeknik Negeri Ujung pandang, Makassar, Indonesia

3PT.Trias Indra Saputra, Jakarta, Indonesia

Email address:

[email protected]

*Corresponding author

To cite this article:

Yani, H., Aminah, N. ., Nofiansah, & Oktarani, M. . (2022). Analysis of Breaking Capacity Calculation on Busbar Room Panel at PT Trias Indra Saputra. International Journal of Research in Vocational Studies (IJRVOCAS), 2(3), 44–50. https://doi.org/10.53893/ijrvocas.v2i3.141

Received: November 29, 2022; Accepted: December 12, 2022; Published: December 27, 2022

Abstract:

The electric panel has a function as a distribution device and as protection for electricity from the PLN. A panel must at least have protective equipment that functions so that if a fault occurs in electrical equipment, the fault can be corrected and does not interfere with the performance of the panel. In order for the protection equipment to work properly, accuracy is required in selecting the current rating and breaking capacity value of the protection components used. The purpose of this research is to analyze the breaking capacity value, nominal load current value, and short circuit current for each electrical protection component in the busbar room panel at PT Trias Indra Saputra. The analysis was carried out by comparing the results of manual calculations with calculations using the XL3-Pro calcul software, as well as the installed protection components. After calculating and comparing the results, the electrical protection components are still suitable for use as protection in the event of a fault, both short circuit fault and overcurrent on the electrical equipment in the busbar room panel at PT Trias Indra Saputra.

In the outgoing protection Q0 is a protection component that connects the power source from the LVMDP panel to the busbar room panel at PT Trias Indra Saputra. Different results were obtained from the three comparisons. By using the MCCB current rating of 100A, it has been able to secure the circuit from short circuit faults and overload.

Keywords:

Electrical panels, electrical protection, breaking capacity, current carrying capacity, MCB, MCCB

1. Introduction

One of the technical factors that need to be considered in the supply and distribution of electric power is power quality.

These factors include voltage stability, service continuity, protection reliability, and power capacity as needed.

Protection is an electrical equipment used to protect electrical components from damage caused by faults such as overload currents or short circuit currents. Good protection is protection that immediately responds or trips when a fault occurs. The type of fault that most often occurs when the system is running normally is an overcurrent fault or commonly called an overload. Another type of fault that often occurs is a short

circuit current fault. In the distribution of electric power, a panel must have protection equipment, which is divided into incoming and outgoing (Firmansyah et al, 2022)

In the busbar space panels at PT Trias Indra Saputra there are various electrical loads. In order to maintain reliability, it must pay attention to the electrical protection components. In the process of operation, unexpected faults may occur such as short circuit faults or sudden overloads which may damage equipment. Therefore, we need components that can protect or secure these equipment so as to minimize faults that occur. The electrical protection components used in this panel are

(2)

Miniature Circuit Breakers (MCB) and Molded Case Circuit Breakers (MCCB) (Revi et al, 2022). MCB is a protection circuit equipped with a thermic component (bimetal) for overload protection and also equipped with an electromagnetic relay for short circuit protection. While the MCCB is a protective device which in the process of operation has two functions, namely as a protection and as a connecting device (Pratama et al, 2022). The purpose of this research is to analyze the breaking capacity value, nominal load current value, and short circuit current for each electrical protection component in the busbar room panel at PT Trias Indra Saputra.

Calculation analysis to determine the capacity of the disconnection capability of the protection components used for 'incoming' and 'outgoing' in the busbar room panel, and adjusting the calculations using the XL3-Pro Calcul software, the use of protective equipment components that have been used, and by using the calculation formula that has been set.

In = P / ( 3 x V x cos θ) (1) IK = In x 1,25 (2) Note: In = Nominal Current (A); IK = current carrying capacity (A); P = Load Power (W); V = Voltage (V); Cos θ = power factor of system (Astanto, et al. 2022 and Efriyanti et al, 2022).

Determine the full load current in the transformer (FLA) Transformator 3 phasa, 𝐼_𝐹𝐿𝐴=^{𝑘𝑉𝐴 𝑥 1000}

𝑉𝑙−𝑙 𝑥 √3 (3) Transformator 1 phasa, 𝐼_𝐹𝐿𝐴=^{𝑘𝑉𝐴 𝑥 1000}

𝑉𝑙−𝑙 (4) 𝑀𝑢𝑙𝑡𝑖𝑝𝑙𝑖𝑒𝑟 = ¹⁰⁰

%𝑍 𝑇𝑟𝑎𝑛𝑠𝑓𝑜𝑟𝑚𝑎𝑡𝑜𝑟 (5) Determine the short circuit current

The short circuit current on the motor contribution and the total short circuit current.

Isc = Transformator F.L.A x Multiplier (6) Calculating the "f" factor

Fault of 3 phase, 𝑓 =^{√3 𝑥 𝐿 𝑥 𝐼}^3𝜃

𝐶 𝑥 𝑛 𝑥 𝑉𝑙−𝑙 (7) fault of 1 phase, line to line, 𝑓 = ^{2 𝑥 𝐿 𝑥 𝐼}^𝑙−𝑙

𝐶 𝑥 𝑛 𝑥 𝑉_𝑙−𝑙 (8) fault of 1 phase, line to netral, 𝑓 = ^{2 𝑥 𝐿 𝑥 𝐼}^𝑙−𝑛

𝐶 𝑥 𝑛 𝑥 𝑉𝑙−𝑛 (9) Note: L = Length of conductor (conducting cable) to the fault; C = constant value “C” for conductors and for busways;

n = number of conductors per phase; I = Value of available

short circuit current at the start of the circuit; V = Voltage on the circuit

Compute “M” (multiplier) 𝑀 = ¹

1+𝑓 (10)

Calculates the short-circuit symmetric RMS current available at the fault point. Add motor contribution, if applicable,

𝐼_{𝑠𝑐.𝑠𝑦𝑚.𝑅𝑀𝑆}= 𝐼_𝑠𝑐 𝑥 𝑀 (11) Abdullah Assegaf (2019) in research about “Koordinasi Selektif MCB Metoda Waktu–Arus dengan Simulasi ETAP MCB Selective Coordination of TimeCurrent Methods with ETAP Simulation”. This study discusses the use of ETAP12.6 software to simulate electrical installation networks equipped with protection equipment, protection system coordination, and MCB selectivity from disturbances. Starting from protecting on the panel side of the main source of power supply to the load side that can be coordinated precisely and reliably in handling a disturbance on the load side. The results show that from the analysis and simulation, namely by selecting the right class of protection rating, the principle of coordination and selectivity of protection for power outages that are released due to disturbances can work properly and reliably (Tanjung et al, 2018).

Agusthinus S. Sampeallo (2022) about “Analisis Gangguan Hubung Singkat Pada Panel Utama Tegangan Rendah Gardu C Bandara El Tari Kupang Untuk Menentukan Kapasitas Pemutusan Pemutus Tenaga Menggunakan Etap 12.6”. This study aims to determine the magnitude of the short circuit value and determine the breaking capacity of a power breaker in the form of a Circuit Breaker (CB). In the simulation section, it is carried out using ETAP, then it is validated with the equations of the existing theory which is based on the impedance value of each sequence on the simulated fault. The values or numbers from the research show that a single-phase short circuit to ground is a fault with a minimum value of 4.82 KA on Switchgear 2 buses. A 3-phase short circuit is a fault with a maximum value of 9.45 KA on Switchgear 1 and 2 buses. Breaker capacity Low voltage panel power results show that the Circuit Breaker (CB) breaking capacity on Bus Switchgear 1 has a breaking capacity of 10,875 KA, on Bus Switchgear 2 the breaking capacity is 8.67 KA and on Bus Switchgear 1 and 2 the breaking capacity is 14,175 KA. (Agusthinus et al, 2022)

(3)

The research was conducted to obtain an overview of

"calculation analysis of breaking capacity on the busbar room panel at PT Trias Indra Saputra". This analysis is based on data from manual breaking capacity calculations for the selection of electrical protection components to be used, then compared with calculations using the Xl3-Pro calcul software, and with the selection of existing electrical protection components.

2.1 Busbar Room Panel Specifications

The research object is the electrical protection components such as the MCB and MCCB, as well as the loads on the busbar space panels at PT Trias Indra Saputra.

Specifications of the Busbar Room Panel: Location at PT.

Indra Saputra Triassic; Triassic local panel box type; IP 3.0;

SPHC Plate Material finishing Powder Coating; Form 1;

Cable connection: Bottom, cable; Paint/color: Powder coating/

orange, Dimensions/size: 101 cm x 61 cm.

Figure 1. Busbar room panels

2.2 Specifications of the load on the busbar room panels The loads on the busbar room panels are used as data in the calculations to determine the breaking capacity of each protection component.

Table 1. Specifications of the load on the busbar room panels

Load Name

Numbers (unit)

Load Power (Watt)

Current (A)

Nominal Voltage

(Volt)

Cable Length (metre)

Type Cable

Mesin YSD 35Y-20, 3~, 50 Hz

1 10.500 22,65 380 20 NYYHY 5x2,5mm Mesin Milling

EX RRC, 50 Hz

1 4.000 7,22 380 10 NYM

3x2,5mm Mesin

Gerinda Bench

1 62 0,33 220 5 NYM

4x1,5mm Mesin Adtech

Q5Y-16, 3~, 50 Hz

1 25.500 46.2 380 20 NYYHY 5x2,5mm Mesin Punch Alfra 1 600 3,2 220 15 NYM

3x2,5mm

3x1,5mm Lighting LED 32 14

Wx36

= 448

2,26 220 36 NYM

3x1,5mm

Kipas Angin 3 150 Wx3

= 450

2,4 220 25 NYM

3x1,5mm

Lighting Mercury Lamp

9 9x71W

= 701 1.57

220

50

NYM 3x1,5mm Lampu TKO 12 12x36W

= 432

220 NYM

3x1,5mm Stop Kontak

3 phasa

2 75 NYAF

2,5mm

2.3 Specifications of electrical protection components on busbar room panels

The general specifications of the MCB and MCCB used range from an isolation voltage rating of 440V–550V AC, 50/60 Hz and the type of trip unit in the form of Thermal Magnetic.

Research procedure

(a) Data collection. Some of the data needed includes current values in the R, S, and T phases; Nominal voltage at each load; Cable length from the load to the protection component on the panel; Specifications of the busbar room panels, loads, and electrical protection components used; (b) Calculating the protection capacity and breaking ability used through manual calculation according to equations (1) to (11);

(c) Calculating the disconnection capability of the protection components using the XL3-Pro calcul software; (d) Comparing the results of manual calculations and calculation results from the XL3-Pro calcul software; (e) Analyzing data from the results of comparisons between manual calculations, calculations using the XL3-Pro calcul software, and with the selection of electrical protection components that have been installed.

Table 2. Specifications of electrical protection components on busbar room panels

Name of protection/product

Number of Pole/curva

Rating Current, In (A)

Rating Voltage (KV)

Breaking capacity

(KA) IP

MCCB pada Q0 EasyPact CVS 160B

Schneider

3P 160 8 25 40

(4)

MCB pada Q1 Acti 9 IC60N Schneider

3P / C 20 6 10 20

MCB pada Q2 IC60H merk Schneider

3P / C 6 10 20 20

MCB pada Q3 dan Q8 Acti 9 IC60N Schneider

3P / C 2 6 6 20

MCB pada Q4, Q7, Q13, dan Q14 Acti 9 IK60N Schneider

3P / C 3 4 6 20

MCB pada Q5 dan Q6 Acti 9 IC60N Schneider

3P / C 10 6 10 20

1P / C 10 6 10 20

1P / C 20 6 6 20

1P / C 4 6 6 20

MCB pada Q12 Acti 9 IC60H Schneider

3P / C 4 6 10 20

3. Results and Discussion

The classification of loads on the Busbar Room at PT Trias Indra Saputra includes: a) Lighting Installation Expenses; b) Socket Installation Load; c) Fan / Air Conditioning Installation Expenses; d) Electrical Machinery Installation Expenses Calculation of Breaking Capacity and Rating Current Protection

Requirements: Iscb (breaker short circuit current) must be greater than or equal to Isc (maximum short circuit current) or (Iscb ≥ Isc) on the electrical protection components used.

Based on PUIL 2011, the value of the RAC for equipment overloaded with overload current is 125% of the nominal load current [7]. With a power factor value (cos ) according to the power from the PLN source, which is equal to 0.85.

Manual calculation of short circuit current values

The value of the short circuit current determines the value of the breaking capacity used by the electrical protection components. Calculations use equations (3), (5), (6), (7), (1.8), (9), (10), (11).

At the PLN source. S = 197 KVA, V = 400 Volts, 3 phase.

The short circuit current at the PLN power capacity obtained using manual calculations is 27.5 KA.

The results of the calculations show that the short circuit

current at the PLN source is 27.5 KA. The value of the short circuit current based on the calculation on the incoming panel side of the busbar room at PT Trias Indra Saputra is 17.88 KA (MCCB Q0). The smallest short circuit current on the MCB Q11 is 2.5kA. The biggest short circuit current on MCB Q6 is 6.32kA.

The results of manual breaking capacity calculations for electrical protection are compared with the selection of components from the calculation results of XL3-Pro calcul and installed protection components, using an average breaking capacity value of 6 KA and 10 KA. For example, in MCB Q1, a short circuit current value of 5.19 KA is obtained, and a breaking capacity of 10 KA is used, which means that the protection component is able to withstand short circuit currents of up to 10 KA. If a fault occurs and the resulting short circuit current is more than 10 KA, the protection component will trip and may even burn. Therefore, when selecting the breaking capacity value for each protection component, it must be ascertained whether there will be additional loads in the future, so that the appropriate breaking capacity value can be determined. However, the calculated value of the short circuit current and the selection of the breaking capacity value in the breaker gap or the range of values cannot be too large.

Table 3. The value of Short Circuit Current, breaking capacity current, and nominal current of electrical protection components

No.

Connection from Protection

to Loads

Short Circuit Current

(KA)

breaking capacity current

(kA)

Nominal Current (Ampere) XL3-

Pro Calcul

Actual

1. MCB Q1 ke Mesin YSD 35Y-20

5,19 10 10 18,76

2. MCB Q2 ke Mesin Milling EX RRC

(Bor Besar)

5,19 10 10 7,15

3. MCB Q3 ke Mesin Gerinda Bench

5,85 10 10 0,33

4. MCB Q4 ke Mesin Adtech Q5Y-16

5,19 10 6 45,58

5. MCB Q5 ke Mesin Punch Alfra

5,61 10 10 3,21

6. MCB Q6 ke 6,32 10 10 19,66

(5)

7. MCB Q7 (Spare) 8. MCB Q8 (Spare) 9. MCB Q9 ke

Lighting Led

2,88 10 10 2,4

10. MCB Q10 ke Kipas Angin

3,375 10 10 2,4

11. MCB Q11 ke Lighting Mercury Lamp + Lampu KO

2,5 10 10 5,72

12. MCB Q12 (Spare) 13. MCB Q13 ke Stop Kontak 3P Area QC

5,9 10 6

14. MCB Q14 ke Stop Kontak 3P Area QC

5,775 10 6

15. MCCB Q0 17,88 25 20

The current carrying capacity is 125% of the nominal load current, the current carrying capacity also affects the selection of the power cut-off value or electrical protection and the choice of the diameter of the conducting cable used. The greater the current-carrying current, the greater the electrical protection and the diameter of the cable used.

The main steps using the XL3-Pro calcul software are: a) Make the system as a whole using an existing single line diagram as a reference without entering circuit specifications, simply entering overall general parameters such as voltage, grounding system, and factor power; b) Enter the power specification for the load and/or the current rating on the circuit line and the cable length used. In this step, XL3-Pro calcul will automatically calculate the electric power used, the current in the circuit, the short circuit calculation, the value of the voltage drop, and so on. c) Select the type of protective equipment components from each circuit. XL3-Pro calcul will select and suggest a list of protective equipment components to be used and have been sorted by relevance and in accordance with the IEC 60947-3 standard.

The single line diagram of the electrical installation that will be made on the XL3-Pro calcul uses the parameters of the power supply, protection equipment, and loads available in the XL3-Pro calcul according to the latest Legrand product catalog when the electrical installation was made.

No.

to Loads

Load Power (Watt)

current carrying capacity (Ampere)

Manual XL3-

Pro Calcul

Manual XL3-

Pro Calcul 1. MCB Q1 ke Mesin

YSD 35Y-20

10.500 10.500 23,45 17,9

2. MCB Q2 ke Mesin Milling EX RRC

(Bor Besar)

4.000 4.000 8,9 6,8

3. MCB Q3 ke Mesin Gerinda Bench

62 62 0,41 0,4

4. MCB Q4 ke Mesin Adtech Q5Y-16

25.500 25.500 56,975 43,4

5. MCB Q5 ke Mesin Punch Alfra

600 600 4,0125 3,1

6. MCB Q6 ke Mesin Euromac

11.000 11.000 24,575 18,7

7. MCB Q7 (Spare) 8. MCB Q8 (Spare) 9. MCB Q9 ke

Lighting Led

448 448 3 2,3

10. MCB Q10 ke Kipas Angin

450 450 3 2,3

11. MCB Q11 ke Lighting Mercury Lamp + Lampu KO

1.071 1.071 7,15 5,5

12. MCB Q12 (Spare) 13. MCB Q13 ke Stop Kontak 3P Area QC

900 900 1,1

15. MCCB Q0 55.431 53.600 116,564 92,2

Figure 2. Comparison graph of the current rating on the outgoing panel of the busbar room

(6)

Table 5. Comparison of Electrical Protection Components in Busbar Room Panels at PT Trias Indra Saputra

No.

to Loads

Type of Protection Components Used

Manual

XL3- Pro Calcul

Actual

1. MCB Q1 ke Mesin YSD 35Y-20

MCB 25 A

MCB 3P/D 20 A

MCB 3P/C 20 A 2. MCB Q2 ke Mesin

Milling EX RRC (Bor Besar)

MCB 10 A

MCB 3P/D 10 A

Gerinda Bench

MCB 2 A MCB 1P/D 2 A

Adtech Q5Y-16

MCB 63A MCB 3P/D 50 A

MCB 3P/C 16 A 5. MCB Q5 ke

Mesin Punch Alfra

MCB 6 A MCB 1P/D 6 A

Mesin Euromac

MCB 25 A

MCB 3P/D 20 A

MCB 3P/C 10 A

7. MCB Q7 (Spare) MCB

3P/C 16 A

3P/C 2 A 9. MCB Q9 ke

Lighting Led

MCB 6A

MCB 1P/C 10 A

Kipas Angin

MCB 6 A

MCB 1P/C 10 A

Lighting Mercury Lamp + Lampu KO

MCB 10A

MCB 1P/C 10 A

MCB 1P/C 4 A

3P/C 4 A

MCB 3P/C 16 A +

ELCB 30mA

MCB 3P/C 16 A

MCB 3P/C 16 A +

ELCB 30mA

MCB 3P/C 16 A

15. MCCB Q0 MCCB

125A

RCBO MCCB 100A

MCCB 160A

Figure 3. Graph of current ratings comparison on incoming panels of busbar room

Data between the results of manual calculations and using the XL3-Pro calcul software, compared with the electrical protection components that have been installed, obtained different values specifically for some protection components.

This can be caused by the level of accuracy of an equipment when the actual measurement is different which affects the results of manual calculations and calculations using the XL3- Pro calcul in determining the current rating of the electrical protection components. Overall, the electrical protection components in PT Trias Indra Saputra's busbar space panels are still suitable for operation as a protection component from short circuit faults and overcurrent.

4. Conclusion

1. The results of the calculation of the value of the short circuit current, in determining the appropriate breaking capacity, the smallest Isc value is 2.5 KA and the largest is 6.32 KA, so that the selection of the breaking capacity value for the protection component used is 6 KA and 10 ka.

(7)

components based on the results of manual calculations has a greater value, compared to the results of calculations using the XL3-Pro calculus, while for the electrical protection components that are actually installed there are several components whose current ratings are smaller, and some are larger.

References

[1] Abdullah Assegaf, Sunarto, Toto Tohir, (2019). Koordinasi Selektif MCB Metoda Waktu -Arus dengan Simulasi ETAP MCB Selective Coordination of Time Current Methods with ETAP Simulation. SENTER 2019, 23 - 24 November 2019, pp.

462-466 ISBN: 978-602-60581-1-9

[2] Abrar Tanjung, Zulfahri, Hamzah, David Setiawan. (2018) Penerapan Sistem Proteksi Instalasi Listrik di Kecamatan Rumbai Pesisir, Fleksibel Jurnal

[3] Agusthinus S. Sampeallo, Evtaleny R. Mauboy, Muhamad Iqbal, (2022), Analisis Fault Hubung Singkat Pada Panel Utama Tegangan Rendah Gardu C Bandara El Tari Kupang Untuk Menentukan Kapasitas Pemutusan Pemutus Tenaga Menggunakan Etap 12.6, Jurnal Media Elektro Vol. XI / No. 1 P-ISSN 2252-6692 | E-ISSN 2715-4963. 2022

[4] Anton Firmansyah, Andika Pratama, D. ., & Ismail, M. R. . (2022). Influence of Maneuvering Singa Feeder at Bukit Siguntang Substation on Power Shrinkage Using ETAP 19.0.1.

International Journal of Research in Vocational Studies

(IJRVOCAS), 1(4), 16–21.

https://doi.org/10.53893/ijrvocas.v1i4.70

[5] Astanto, I. ., Arifin, F. ., Bow, Y. ., & Sirajuddin. (2022). Study of Effect Changing the Blade Shape and Lift Angles on Horizontal Wind Turbine. International Journal of Research in Vocational Studies (IJRVOCAS), 2(1), 33–37.

[6] Badan Standarisasi Nasional. (2000). Persyaratan Umum Instalasi Listrik 2000 (PUIL 2000), Jakarta: BSN

[7] Badan Standarisasi Nasional. (2011). Persyaratan Umum Instalasi Listrik 2011 (PUIL 2011), Jakarta: BSN

[8] Dimitrios Tzelepis, Adam Dyśko, Steven M. Blair, Anastasios Oulis Rousis, Sohrab Mirsaeidi, Campbell Booth, Xinzhou Dong, (2018). Centralised busbar differential and

current grids, with practical IEC-61869-compliant measurements. IET Journals ISSN 1751-8687

[9] Efriyanti, R. ., Taqwa, A. . ., & Arifin, F. . . (2022).

Temperature Decreasing Circulation of Solar Panels Using Water Flow. International Journal of Research in Vocational

Studies (IJRVOCAS), 2(2), 48–52.

[10] Nurhabibah Naibaholo, Mohammad Yoverly, (2022). Analisis Perhitungan Kebutuhan Genset Stamford 670 KVA Pada Apartemen Mustika Golf Residence Cikarang Jawa Barat, Jurnal Elektro Vol 10 No 1 Januari 2022, ISSN : 2302-4712 [11] Pratama, D. A. ., Anisah, M., & Setiyadi, K. A. . (2022). The

Three Phase Induction Motor Test Using MATLAB 2021b/SIMULINK at Bukit Energi Servis Terpadu, Ltd.

(IJRVOCAS), 1(4), 60–65.

[12] Revy, S., Taqwa, A. . ., & Arifin, F. . . (2022).

Utilization of Solar Energy in the Substation Energy in Provider Connected to PT. PLN (Persero) Based on IoT.

(IJRVOCAS), 2(2), 41–47.