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All Journal Ibtida'i : Jurnal Kependidikan Dasar Journal of Electronic and Electrical Power Application
Saefurrohman, Asep
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Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Other

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Analisis Kesulitan Belajar Peserta Didik pada Materi Penjumlahan dan Pengurangan Fitriyani, Desi; Saefurrohman, Asep; Mansur, Mansur
Ibtida'i Vol 10 No 2 (2023): Juli-Desember 2023
Publisher : Jurusan Pendidikan Guru Madrasah Ibtidaiyah Fakultas Tarbiyah dan Keguruan Universitas Islam Negeri Sultan Maulana Hasanuddin Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32678/ibtidai.v10i2.9330

Abstract

Tujuan dari penelitian ni adalah untuk mengetahui kesulitan yang dialami siswa kelas II dalam menyelesaikan soal penjumlahan dan pengurangan. Metode yang digunakan dalam penelitian ni adalah metode kualitatif deskriptif dengan jenis penelitian fenomologi, adapun subjek penelitian adalah kepala sekolah, wali kelas, dan peserta didik kelas II di SDN Carenang II menggunakan teknik pengumpulan data berupa observasi, tes tulis, wawancara dan dokumentasi. Dapat disimpulkan bahwa untuk kesulitan belajar siswa untuk materi penjumlahan dan pengurangan meliputi 1) Belum menguasai prosedur penjumlahan pengurangan bilangan dengan cara menyimpan; 2) Kesulitan memaknai soal cerita; 3) Kekurang telitian dalam mengerjakan soal. Adapun faktor yang menyebabkan kesulitan belajar siswa kelas II di SD Negeri Carenang I materi penjumlahan dan pengurangan ni yaitu Faktor nternal dan faktor eksternal. Faktor nternal yang meliputi bakat, hiperaktif dan siswa belum memahami materi. Faktor eksternal meliputi lingkungan keluarga, fasilitas belajar.
EVALUATION OF SF6 GAS QUALITY TEST AT THE 150 KV KALIBAKAL SUBSTATION Saefurrohman, Asep; Mubarok, Rizky; Mubarok, Fachruroji
Journal of Electronic and Electrical Power Applications Vol. 5 No. 1 (2025): JEEPA Volume 5 Nomor 1
Publisher : Program Studi Teknik Elektro Universitas Peradaban

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58436/jeepa.v5i1.2292

Abstract

Electricity has become a primary necessity in modern life, and the substation functions as a pivotal hub for its distribution from the source to the customer. This critical infrastructure is equipped with vital equipment such as PMT (Power Breakers), which play a crucial role in ensuring system reliability. The PMT serves dual functions as both a breaker and a connecting switch, handling anomalies or network repairs efficiently. However, PMT operations frequently involve arcs, which have the potential to damage equipment. To mitigate this risk, SF6 insulating gas is employed to effectively extinguish arcs, ensuring the safety and reliability of the electrical network. Routine testing is imperative to ensure the efficacy of SF6 gas, encompassing assessments of purity, dew point, and decomposition products. The present study was conducted over a period of two months at the 150kV Kalibakal Substation. The research method incorporated field observation, a comprehensive review of existing literature, and rigorous SF6 gas testing procedures.The study's findings revealed that the average purity of SF6 gas exceeded 97%, the presence of decomposition products of SO2 was absent, and the dew point was recorded to be less than -5°C. Additionally, the SF6 gas pressure at Bay bumiayu 1 and bumiayu 2 remained within safe limits, exceeding 6.4 bar.A significant decrease in pressure could potentially compromise the functionality of the PMT, as it was observed that the PMT operates optimally at pressures above the nominal value. However, at pressures below the nominal value, the performance of the PMT is compromised, leading to malfunctions in the arc fire extinguisher and potentially causing equipment damage and endangering human safety. The findings indicate that the condition of SF6 gas is stable and safe for substation operations.
Co-Authors Fitriyani, Desi Heti Mulyati Mubarok, Fachruroji Mubarok, Rizky Musa Hubeis Siti Helmyati