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All Journal International Journal of Research in Vocational Studies (IJRVOCAS) Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering)
Siswandi
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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Testing of Deliver Active Power for Operation Sub–Sync and Super-Sync on Doubly Fed Induction Generator Applied in Wind Turbine Mutiar; Siswandi; Yessi Marniati; Nurhaida; Dezetty Monika
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 3 (2022): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v2i3.152

Abstract

Technology developments related to the renewable energy industry are increasing, one example of wind power generation technology which has several relationship configurations with generator. This system configuration is known a wind generator with a DFIG (Double Fed Induction Generator). This system can supply active power from the induction generator stator connected directly to the network while the rotor is connected to the network through a back to back converter. The operation of the double feeder induction generator (DFIG) consists of two conditions, the first condition is super-synchronous where power will be transmitted from the rotor through the converter to the network and the second condition is sub-synchronous where the rotor will absorb power from the network through the converter. This research was conducted to determine the active power distribution in two operating conditions of a double feeder induction generator. Generator power delivery increases for sub-synchronous and super-synchronous operation when active MSC increases from 10% to 60% and generator speed is constant. For a changing speed and a constant active MSC, constant power distribution from the generator (PDFIG) is obtained.
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.
Performance Comparison of RTL-SDR and HackRF as ADS-B Signal Receivers at 1090 MHz Sholihin Sholihin; Siswandi; Eka Susanti; Herman Yani; Sopian Soim; Hotmauli Gracia Simatupang
Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) Vol 13 No 2 (2026): Jurnal Ecotipe, October 2026
Publisher : Jurusan Teknik Elektro, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jurnalecotipe.v13i2.4620

Abstract

The development of Software Defined Radio technology enables flexible reception and analysis of communication signals using software-based devices. One of its applications is the Automatic Dependent Surveillance-Broadcast (ADS-B) system, which operates at a frequency of 1090 MHz to digitally transmit flight information. This compare the performance of RTL-SDR and HackRF in receiving ADS-B signals at 1090 MHz. The research was conducted using an experimental method by testing both SDR devices under the same testing conditions and configurations. Signal reception was performed using SDR software and ADS-B decoding software to obtain flight data that could be successfully received and decoded. The test results were used to evaluate the capability of each device to receive and display ADS-B data at 1090 MHz. Based on the experimental results, both devices were capable of receiving ADS-B signals at 1090 MHz but exhibited different performance characteristics. These differences were influenced by device capabilities, receiver configurations, and environmental conditions during signal reception. RTL-SDR offers advantages in terms of cost and ease of use, while HackRF provides greater device flexibility for signal configuration and testing. The results indicate that both devices can be utilized as ADS-B signal receivers, with device selection depending on the specific requirements and intended application. Expected to serve as a reference for the use of SDR devices in receiving and monitoring ADS-B signals at 1090 MHz.
Co-Authors Andri S Arif EN Carlos RS EKA SUSANTI Herman Yani Hotmauli Gracia Simatupang Monika, Dezetty Mutiar Nurhaida Rumiasih Sholihin Sholihin Sopian Soim, Sopian Yessi Marniati