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All Journal ELPOSYS: Jurnal Sistem Kelistrikan
Sulistyowati
Politeknik Negeri Malang
Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Analisa Audit Energi Listrik di PT. Ispat Bukit Baja Kota Bekasi Sulistyowati; Ar Raafi Pangestu; Sigit Setya Wiwaha
Elposys: Jurnal Sistem Kelistrikan Vol. 9 No. 3 (2022): ELPOSYS vol.9 no.3 (2022)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (610.39 KB) | DOI: 10.33795/elposys.v9i3.644

Abstract

An audit energy needs to be carried out because the value of Energy Consumption Intensity in 2020 is 251 kWh / m2 / year and in 2021 it is 221 kWh / m2 / year and the value of Specific Energy Consumption in 2020 is 0.26 GJ / Ton and in 2021 is 0.29 GJ/Ton. The energy audit method used is to calculate the value of Energy Consumption Intensity and Specific Energy Consumption. The savings opportunities made are on the air conditioning system, lighting system, and electric motor load. From the results of the analysis and calculation of savings in the air conditioning system, savings of 50.1% or 67.70 kWatt were obtained using a psychrometric diagram to determine the cooling system according to the needs of the room, then for the lighting system, savings of 21.9% or 6 kWatt by replacing the installed lighting system with energy-saving lamps, then the load of the electric motor is using capacitor to improve the power factor value which was originally 0.77 to 0.85 with the aim that the motor speed does not change which will result in the precision of the production obtained savings in the use of apparent power of 7.13% or 126.52 kVA. The total recommended power saving obtained from the calculation results is 73.7 kWatt. So based on the calculation of the energy audit that has been done, it can reduce production costs and energy use efficiency
Kajian Koordinasi Sistem Proteksi Pada Sistem Transmisi 70 kV GI Banaran Kediri Transmission Line Bay Pare Hafid Abibie; Sulistyowati; Ferdian Ronilaya
Elposys: Jurnal Sistem Kelistrikan Vol. 7 No. 3 (2020): ELPOSYS vol.7 no.3 (2020)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (960.233 KB) | DOI: 10.33795/elposys.v7i3.668

Abstract

The substation is one of the components in the electric power distribution system which plays a very important role because itis the connection between electricity services to customers. In the electric power distribution system, there are disturbances that often occur,one of which is a short circuit. For that, the way to overcome this is using the Distance Relay protection system, OCR / GFR and DEF. Thepurpose of writing this research is to determine the value of setting relay distance, setting Over Current Rele and Directional Earth Fault relayin order to secure the 70 kV transmission network connected to GI Banaran, which is then simulated using DigSILENT 15.1 software on thePare line by calculating symmetrical and asymmetrical disturbances. including 3-phase disturbance on February 1, 2018. The simulationresults show that the 3-phase disturbance occurs at Zone 1 relay distance of the Banaran Bay Pare substation with a trip time of 0.02 secondswith a fault impedance of 0.083 ohms below the relay impedance value of 0.887 ohms. The coordination between the distance relay on theside of the Banaran Bay Pare substation has worked well because there is no error reading the relay when it will cut off the disturbance.
Analisis Perencanaan Capacitor Bank Untuk Perbaikan Faktor Daya Pada Pusat Perbelanjaan Blitar Square Sulistyowati; Muhammad Fahmi Hakim; Ikfi Asmaul Khusna; Heri Sungkowo
Elposys: Jurnal Sistem Kelistrikan Vol. 8 No. 3 (2021): ELPOSYS vol.8 no.3 (2021)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v8i3.80

Abstract

From the research that has been done at the Blitar Square Shopping Center, it was found that the power factor value is still below the standard with an average value of 0.711. Therefore, it is necessary to improve the power factor by installing a capacitor bank. The calculation results show that global compensation requires 12 capacitor banks with a rating of 10.4 kVAR, while sectoral compensation on the chiller load panel requires 7 capacitor banks with a rating of 10.4 kVAR and the foodmart load panel requires a capacitor bank with a rating of 10. 4 kVAR is 6 pieces. In addition, the installation of a capacitor bank also results in an increase in the voltage value in the system, this voltage increase is still below the permissible standard of ± 5%. The simulation of installing a capacitor bank on global compensation can improve the power factor value from 72.99% to 96.97%, with a voltage increase of 0.479% from the initial value of 397 V to 398.9 V, and a decrease in the current value of 24.645% from the initial value. 330.7 A to 249.2 A. While the simulation of installing a capacitor bank in sectoral compensation can improve the power factor value from 72.99% to 93.57%, with a voltage increase of 0.401% from the initial value of 397 V to 398.6 V , and a decrease in the value of current by 21.593% from the initial value of 330.7 A to 258.1 A.
Co-Authors Ar Raafi Pangestu Fahmi Hakim, Muhammad Hafid Abibie Ikfi Asmaul Khusna Ronilaya, Ferdian Sigit Setya Wiwaha Sungkowo, Heri