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All Journal International Journal of Applied Power Engineering (IJAPE) Prima Magistra: Jurnal Ilmiah Kependidikan Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika
Yaman Yaman, Yaman
Politeknik Negeri Lhokseumawe
Electrical & Electronics Engineering Other

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Innovation of control valve motorization method for regulating turbine rotation in micro hydro generators Hardi, Supri; Safitri, Nelly; Yaman, Yaman; Radhiah, Radhiah; Jamaluddin, Jamaluddin
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i1.pp90-100

Abstract

The method of transferring the main load to the dummy load is still used in micro hydropower plants. Because the turbine and generator are constantly operating at maximum capacity, the load transfer system, also known as the electronic load control (ELC) system, is ineffective and inefficient. The researcher devised a method for controlling the pressure/flow rate on the branch pipe by using a control valve motorized (CVM). Control valve motorized (CVM) is responsible for the opening and closing of branch pipelines using an electric motor. The goal is to achieve voltage and frequency stability by using CVM to adjust the flow/pressure of water in the branch pipe. The method involves designing and testing the CVM system via a Pelton turbine module connected to the generator. The results of testing the Pelton turbine module with a pressure of 4 kg/cm2 on a 34-inch pipe show that the turbine rotates at 800 rpm. Brushless direct current (BLDC) generator with 12 poles and a Pelton turbine. The proportional integral derivative (PID) controller control parameters are calculated by the control system using the Nichols-Ziggler method, with tuning results of PB 130%, Ti 2.8 seconds, and Td 0.7 seconds. A frequency of 50 Hz and a voltage of 61 volts is produced by controlling the set point (SP) at 55% of the process variable (PV) and the manipulated variable (MV) to CVM at 38%, respectively. The conditions are implemented by varying the load on the system by connecting and disconnecting the load; the system remains stable for 5 seconds.
Pengujian Daya Balik pada Sinkronisasi Generator dengan Sumber Daya Sangat Besar (Infinite Bus) secara Otomatis menggunakan Multifunction Relay Tipe GCP-30 di Laboratorium Sistem Proteksi dan Distribusi Jurusan Teknik Elektro Yaman, Yaman; Hasanuddin, Teuku; Yassir, Yassir; Fahlevi, Reza Tri
Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika Vol. 19 No. 1 (2022): Jurnal Litek, March 2022
Publisher : Jurusan Teknik Elektro Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.747 KB) | DOI: 10.30811/litek.v19i1.22

Abstract

Daya balik atau motoring adalah peristiwa berubahnya fungsi generator listrik menjadi motor listrik pada saat sinkronisasi generator. Perubahan ini diakibatkan oleh berbaliknya arah aliran daya. Pengamanan generator dari gangguan daya balik biasanya menggunakan reverse power relay, dengan proses sinkronisasi dilakukan secara manual menggunakan synchronoscope. Multifunction Relay tipe GCP-30 adalah alat yang dapat melakukan kedua hal tersebut secara bersamaan. Alat ini berfungsi untuk menyinkronisasi generator secara manual atau otomatis, yang dilengkapi dengan pengaman, termasuk gangguan dari daya balik. Pengujian dilakukan untuk mengetahui pengaruh daya balik terhadap perubahan parameter torsi, arus medan eksitasi generator, dan jumlah beban yang dilayani. Hasil dari pengujian torsi diperoleh bahwa perubahan torsi akan mengubah pembagian beban, yang akan mengakibatkan timbulnya daya balik yang berlebih. Multifunction Relay tipe GCP-30 akan trip pada saat daya balik bernilai -67 W jika di set -8%. Hasil dari pengujian perubahan arus medan eksitasi generator adalah tidak adanya daya balik, tetapi generator akan berubah menjadi beban reaktif. Daya reaktif bernilai -441 VAR pada saat arus eksitasi bernilai 0 A. Adapun hasil dari pengujian perubahan beban adalah bertambah atau berkurangnya daya akan ditanggung oleh sumber daya yang lebih besar, yaitu daya dari sistem.
ANALYZING ELEMENTARY STUDENTS' MISCONCEPTION PATTERNS IN KEY SCIENCE AND SOCIAL STUDIES (IPAS) TOPICS: IMPLICATIONS FOR INSTRUCTIONAL DESIGN Yaman, Yaman; Abdurahman, Ayi; Nugraha, Dewanta Arya; Fattahillah, Nuris
Prima Magistra: Jurnal Ilmiah Kependidikan Vol. 6 No. 3 (2025): Volume 6 Number 3 (July 2025)
Publisher : Program Studi PGSD Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/jpm.v6i3.5627

Abstract

Persistent misconceptions in foundational science ideas often resist routine instruction, undermine knowledge transfer, and remain hidden when assessments capture answers but not reasoning. Within Indonesia’s integrated Science–Social Studies curriculum (IPAS), such misconceptions can cluster around core topics and shape students’ subsequent learning trajectories. This study maps elementary students’ misconception patterns across five IPAS topics—Force–Motion, Changes of State, Energy, Weather/Water Cycle, and Ecosystems—and translates the findings into design principles for instruction. Using an explanatory sequential mixed-methods design, we collected data from 204 Grade 4–6 students in three public schools via a locally contextualized two-tier diagnostic test and clinical interviews supported by concept cartoons. Instrument quality was adequate (mean Aiken’s V = 0.90; internal reliability per topic = 0.71–0.77; inter-rater reliability ? 0.78). Aggregate responses were distributed as 44.2% scientifically sound, 28.1% partial, and 27.7% strong misconceptions, with a grade-level trend toward improvement. The most persistent hotspots appeared in Ecosystems and Force–Motion. Tiered item sensitivity showed a consistent decrease in misconception rates from Q1 (everyday contexts) to Q4 (diagram/model representations), underscoring the role of multiple representations in bridging non-scientific intuitions. Approximately 9–12% of responses were false positives, highlighting the need to evaluate reasoning in addition to answers. Findings inform operational strategies: eliciting initial ideas with mini two-tier items; orchestrating multiple representations and simple empirical evidence within a 5E sequence with explicit refutation; and embedding metaconceptual reflection with formative assessment attuned to misconception patterns. Limitations include geographic scope and non-causal design. Future work should broaden contexts, test instrument invariance, and evaluate a 5E–refutation package quasi-experimentally.
Co-Authors Ayi Abdurahman Dewanta Arya Nugraha Fahlevi, Reza Tri Fattahillah, Nuris Hardi, Supri Hasanuddin, Teuku Jamaluddin Jamaluddin Nelly Safitri Radhiah, Radhiah Yassir Yassir