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All Journal International Journal of Research in Vocational Studies (IJRVOCAS)
Carlos RS
Politeknik Negeri Sriwijaya
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Automatic Control System for Hybrid Electrical Energy Supply Based on Internet of Things M. Edwin Syah Effendy; RD Kusumanto; Carlos RS
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (598.42 KB) | DOI: 10.53893/ijrvocas.v1i2.47

Abstract

The utilization of renewable energy is slowly starting to become one thing that to be interesting inside the development of science technology. The utilization of renewable energy is from at least two renewable energy (Solar Power Plants and Wind Power Plants), State Electricity Enterprise (PLN), and Generator Sources. This device could be operated automatically and integrated on the internet, which has a monitoring system such as voltage, inside which will be used to control everything inside that system. This device is designed to be operated in a combinational manner. This means to be operated based on the voltage value which qualified to activate the load. The utilization of the 3.3V microcontroller is able to design an efficient and low-cost board. Besides that, the device also uses the PLN and Generator set sources as the power backup when the main power runs out. Base on the research noted, this device will distribute the electric source to the houses, which means beneficial for the local society. This device might be applied automatically to four different sources with C++ Programming language to set the point value.
Analytical Evaluation of Existing ANSI 50/51 Overcurrent Relay Settings for Coal Mill 2B Motor at STG-BB Power Plant, PT Pupuk Sriwidjaja Palembang Rumiasih; Andri S; Carlos RS; Mutiar; Siswandi; Arif EN
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.538

Abstract

This study presents an analytical evaluation of the existing ANSI 50/51 overcurrent relay settings for the Coal Mill 2B motor at the STG-BB power plant of PT Pupuk Sriwidjaja Palembang. Direct trip testing was not conducted because the motor is part of an operating industrial installation. The evaluation combines a review of the existing relay settings, calculation of the manufacturer-defined Long Time Inverse characteristic, comparison with the reported motor starting current and starting time, and analysis of ten days of recorded operating current, voltage, and active power. The ANSI 51 pickup is 136 A, equivalent to approximately 1.03 times the 132 A motor nameplate current, with TMS = 0.025. The reported high-set ANSI 50 stage is 1,227.6 A, equivalent to 9.3 times the motor nameplate current, with a definite delay of 0.01 s. Using the MiCOM P225 Long Time Inverse characteristic, the calculated operating time at the reported starting current of 985.91 A is approximately 0.48 s, which is close to the upper end of the reported 0.3–0.5 s starting time. Therefore, starting-current ride-through cannot be conclusively verified from the available data. During the ten observation days, the recorded running current ranged from 76.93 A to 95.80 A, with an average of approximately 85.69 A, equivalent to 64.9% of the 132 A nameplate current. The observed current remained 40.20–59.07 A below the 136 A pickup. These results provide an analytical assessment of the existing relay settings under the observed operating conditions, but do not demonstrate complete selectivity, protection coordination, fault sensitivity, or overall relay reliability.
Co-Authors Andri S Arif EN M. Edwin Syah Effendy Mutiar RD Kusumanto Rumiasih Siswandi