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All Journal International Journal of Electrical and Computer Engineering JTEV (Jurnal Teknik Elektro dan Vokasional TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of Engineering and Technological Sciences JURNAL NASIONAL TEKNIK ELEKTRO MODELING: Jurnal Program Studi PGMI SEIKO : Journal of Management & Business Edumaspul: Jurnal Pendidikan Jurnal E-Bis: Ekonomi Bisnis JOURNAL OF BUSINESS AND ECONOMICS RESEARCH (JBE) Bisnis Net : Jurnal Ekonomi dan Bisnis Jurnal Amplifier: Jurnal Ilmiah Bidang Teknik Elektro dan Komputer Bulletin of Economic Studies (BEST) Andalasian International Journal of Applied Science, Engineering, and Technology Andalas Journal of Electrical and Electronic Engineering Technology Jurnal Guru Pencerah Semesta (JGPS) Jurnal Pengabdian Masyarakat Bangsa Seminar Nasional Hasil Penelitian LP2M UNM Journal Economic Management and Business Abdurrauf Journal of Islamic Studies INOVASI: Jurnal Ekonomi, Keuangan, dan Manajemen Jurnal Ilmiah Bongaya (JIB)
Abdul Rajab
Department Of Electrical Engineering, Universitas Andalas
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Prediction of ZnO Surge Arrester Degradation Based on Temperature and Leakage Current Properties Novizon Novizon; Zulkarnain Abdul-Malek; Aulia Aulia; Eka Putra Waldi; Abdul Rajab; Darwison Darwison
JURNAL NASIONAL TEKNIK ELEKTRO Vol 7, No 2: July 2018
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (435.089 KB) | DOI: 10.25077/jnte.v7n2.501.2018

Abstract

Temperature and leakage current on the ZnO arrester are interrelated with each other. In low conduction region, voltage-current characteristics of ZnO surge arrester are highly dependent on temperature. The leakage current will increase as the temperature increases and experience thermal runaway when the temperature exceeds the acceptable limit. This phenomenon is associated with the increase of resistive leakage current due to degradation. Therefore the temperature and leakage current are good indicator to evaluate the condition of ZnO arrester. This paper proposed the degradation  prediction of ZnO surge arrester by analyzed the temperature and leakage current. The 132 kV station type ZnO surge arrester was employed. Temperature profile of ZnO arrester was obtained using thermal camera. The leakage current was measured simultaneous with the temperature measurement to attain the leakage current at the actual temperature. The results shows the leakage current continue increasing by increasing the temperature. Keywords : Resistive leakage current, temperature, degradation, prediction, zinc oxide surge arrester
Gas Production by Monoester of Saturated Fatty Acids under Electrical Fault Abdul Rajab; Dzaki Ahmad Fertoni; Riko Novendra; Husnul Fajri
JURNAL NASIONAL TEKNIK ELEKTRO Vol 11, No 2: July2022
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (978.513 KB) | DOI: 10.25077/jnte.v11n2.968.2022

Abstract

This paper deals with the gas production by monoester oil intended to be used as insulating oil under an electrical discharge of low energy. The monoester contains only saturated fatty acids in its hydrocarbon chain. The electrical fault was realized by implementing an AC high voltage to hemispherical shaped electrode pairs with the gap of 2.5 mm immersed in the oil sample. The voltage application was paused when the breakdown occurred in oil and re-applied repeatedly up to 50 and 75 times to allow a high concentration of gasses produced by the oil sample. The resulting gasses were extracted from the oil sample using the headspace method and then analyzed using gas chromatography (GC). Fault identification methods, like DGA status, Key Gas, Duval Triangle, and IEC Ratio, were performed to predict the fault causing the production of such gasses. The results are compared with those of the monoester of unsaturated type. It is found that the Key Gas method is applicable for both oils under electrical discharge. The Duval Triangle and the IEC Ratio methods diagnose the electrical discharge in both monoesters but overestimate them as high energy discharge.
Pengembangan Minyak Isolasi Transformator Ramah Lingkungan dan Terbarukan Dari Etil Ester Abdul Rajab; Haviz Yestian; Reyhan Maulvi Pradipta; Tesya Uldira Septiyeni
JTEV (Jurnal Teknik Elektro dan Vokasional) Vol 8, No 1 (2022): JTEV (Jurnal Teknik Elektro dan Vokasional)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (218.683 KB) | DOI: 10.24036/jtev.v8i1.113730

Abstract

Makalah ini membahas hasil eksperimen terhadap sejumlah parameter Etil ester sebagai minyak isolasi. Tiga macam Etil ester, yaitu Etil miristat, Etil palmitate dan Etil stearate, dibuat melalui reaksi esterifikasi antara Etil alcohol dan asam miristat, asam palmitate dan asam stearat. Sejumlah parameter listrik, fisika dan kimia seperti tegangan tembus, viskositas kinematic, massa jenis, kadar air, angka keasaman dan stabilitas oksidasi diuji dan dibandingkan dengan standar spesifikasi ASTM D 6871. Hasil pengujian menunjukkan bahwa tegangan tembus semua sampel Etil ester lebih tinggi dari nilai minimal yang dipersyaratkan oleh standar. Viskositas kinematic, massa jenis dan angka keasaman semua sampel lebih rendah dari nilai maksimal yang ditolerir oleh standar. Angka peroksida semua sampel, yang digunakan sebagai indikator stabilitas oksidasi, lebih rendah dari minyak mineral. Kadar air merupakan satu-satunya parameter yang masih lebih tinggi dari nilai yang diperbolehkan oleh standar.
Proposal of analysis method to reduce back-flashover rate taking account of tower footing resistance Yusreni Warmi; Zulkarnaini Zulkarnaini; Abdul Rajab; Chitra Yuanisa; Rizki Oktrinanda Elyas; Andi M. Nur Putra; Zuriman Anthony
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 1: February 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i1.pp94-106

Abstract

The number of lightning stroke on the tower of the 150 kV Koto Panjang-Payakumbuh transmission line located the rocky area has been observed. The high value of tower footing resistance indicates the occurrence of the back-flashover in the transmission line at intensity of 74%. The back-flashover occurrence is dominantly triggered by the tower footing resistance value. Also, the rate of back-flashover has an effect on the value of the tower footing resistance by considering the number of electrode installations. A design is proposed for the grounding system of the tower footings in order to reduce the rate of back-flashover. The results presenting in numerical simulation indicates that it works properly after adding 4 electrodes. That is to say, installing 4 electrodes in each tower has successfully decreased the tower footing resistance value, back-flashovers rate 80% and 90-95% of present value respectively. The insulator voltage can be reduced to less than half of the present voltages as much as 30-50%. In more detail, in tower 77, the value of the tower footing resistance drops to 2.84 Ω, the flashover rate drops to 0.57/100 km/year and the insulator voltage drops to 0.99 MV when a disturbance occurs.
Disturbance Modeling on Transmission Lines Using Wavelet Transform Method: A Review Sitti Amalia; Mardini Hasanah; Yusreni Warmi; Novizon Novizon; Abdul Rajab
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 2 No. 2 (2022): November 2022
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v2i2.31

Abstract

This paper introduces a number of methods for identifying disturbances on transmission lines and provides algorithms for classifying various disturbance types. working with the discrete wavelets transform (DWT) and various embedded systems techniques using a simulator to carry out digital simulations of system trials using the controlled technique, the nature of disturbance in distinct sub-systems is determined. The analysis of transmission lines using the wavelet transform is the main topic of this study, along with techniques for transmission line protection. These factors include channel capacity, channel length, simulation software, mother wavelet type, parameters, sampling frequency, and type of disturbance analysis.
Methyl Ester-Mineral Oil Mixture under Thermal Aging Abdul Rajab; Panglima Ibnu Alfaradhi; Rizky Kencana Putra; Riko Nofendra
JURNAL NASIONAL TEKNIK ELEKTRO Vol 12, No 3: November 2023
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jnte.v12n3.1029.2023

Abstract

Replacement with natural esters (retrofilling) is an alternative solution to extend the life expectancy of an oil-filled transformer containing mineral oil. During the retro-filling process, some portions of the mineral oil remain inside the transformer's tank, forming a mixture between the used mineral oil and the new vegetable oil. In this investigation, methyl ester was mixed with a relatively low percentage of mineral oil to simulate the retro-filling process. The aim is to examine the characteristics of a mixture of mineral and vegetable oils under thermal aging. Thermal aging treatments were carried out at 120°C for 28 days and 140°C for 14 days. Kraft paper and copper wire were incorporated during the aging test. After thermal aging, the characteristics of the oil mixture were evaluated based on electrical, physical, and chemical characteristics. The result shows that physical and chemical characteristics are significantly influenced by the increase in mineral oil content and the temperature of thermal aging. However, the breakdown voltage increased after thermal aging, but at a higher temperature, the breakdown voltage dropped as the mineral oil content increased.
Disturbance Modeling on Transmission Lines Using Wavelet Transform Method: A Review Sitti Amalia; Mardini Hasanah; Yusreni Warmi; Novizon Novizon; Abdul Rajab
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 2 No. 2 (2022): November 2022
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v2i2.31

Abstract

This paper introduces a number of methods for identifying disturbances on transmission lines and provides algorithms for classifying various disturbance types. working with the discrete wavelets transform (DWT) and various embedded systems techniques using a simulator to carry out digital simulations of system trials using the controlled technique, the nature of disturbance in distinct sub-systems is determined. The analysis of transmission lines using the wavelet transform is the main topic of this study, along with techniques for transmission line protection. These factors include channel capacity, channel length, simulation software, mother wavelet type, parameters, sampling frequency, and type of disturbance analysis.
Use of IoT Technology in Home Security Monitoring Systems: A Review Rahmawati Fitriyan; Muhammad Imran Hamid; Abdul Rajab
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 4 No. 1 (2024): May 2024
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v4i1.111

Abstract

Utilizing IoT technology in home security monitoring systems offers an effective solution to improve energy efficiency and security by allowing users to monitor and control electronic devices remotely via the Internet. The basic principles of a smart home include reliable connectivity, device interoperability, stringent security and privacy, and energy efficiency. IoT communications are supported by technologies such as RFID and Wi-Fi to ensure effective wireless data transmission. IoT facilitates connecting new devices without additional installation, using technologies such as Wi-Fi, Barcodes (QR codes), and Bluetooth for various applications. The application of IoT in home security monitoring involves platforms such as Blynk and web servers for remote control, with a focus on data protection and system security. This paper compiles various research and conference-related aspects of IoT, including privacy, educational guidelines, system characterization, innovative grid communications, bridge monitoring, RFID authentication, Wi-Fi technology, Bluetooth communications, smart home applications, and security systems. Topics covered include energy monitoring systems, smart home security, earthquake detection, IoT privacy and security, automation, edge intelligence, and Internet of Things architecture.
PENGARUH EXPERIENTIAL MARKETING DAN DELIVERY SERVICE TERHADAP KEPUASAN PELANGGAN PADA UD. QOQOM FOODS DI MEDAN Purnamasari, Linurya; syauqi, T.M; Rajab, Abdul
Journal Economic Management and Business Vol 2, No 2 (2023)
Publisher : Universitas Dharmawangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46576/jfeb.v2i2.4171

Abstract

Adapun tujuan dari penelitian ini yaitu untuk mengetahui pengaruh experiential marketing dan delivery servicesecara simultan terhadap kepuasan pelanggan pada UD Qoqom Foods di Medan. Sedangkan teknik pengumpulan data yang digunakan menggunakan teknik angket atau kuesioner, sedangkan teknik analisis data yang digunakan yaitu metode analisis regresi linear berganda. Berdasarkan hasil penelitian dapat disimpulkan bahwa ada pengaruh experiential marketingsecara parsial terhadap kepuasan pelanggan UD. Qoqom Foods di Medan. Selain itu ada pengaruh delivery service secara parsial terhadap kepuasan pelanggan UD. Qoqom Foods di Medan, serta ada pengaruh experiential marketing dan delivery service secara simultan terhadap kepuasan pelanggan UD. Qoqom Foods di Medan, hal ini diketahui dari harga Fhitung = 138,485 yang dibandingkan Ftabel sebesar 3,13 maka 138,485 >3,13yang artinya variabel experiential marketingdan delivery servicesecara simultan memiliki pengaruh yang nyata (signifikan) atau berpengaruh positif dengan variabel kepuasan pelanggan.
PENGARUH KOMUNIKASI KERJA DAN LINGKUNGAN KERJA TERHADAP PRODUKTIVITAS KERJA KARYAWAN PADA PT. TRIROYAL TIMURRAYA DI MEDAN Silalahi, Julfi Juari; Rajab, Abdul; Hanum, Azizah
Journal Economic Management and Business Vol 2, No 1 (2023)
Publisher : Universitas Dharmawangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46576/jfeb.v2i1.3418

Abstract

Penelitian ini bertujuan untuk mengetahuipengaruh : 1) Komunikasi Kerja terhadap MinatBerwirausaha, 2) Lingkungan Kerja terhadapProduktivitas Kerja, 3) Komunikasi Kerja danLingkungan Kerja Terhadap Produktivitas KerjaKaryawan. Penelitian ini merupakan penelitian kuantitatifdengan metode korelasi, populasi dalam penelitian iniadalah Karyawan PT. Triroyal Timurraya. Tekniksampling yang digunakan adalah purposive samplingdengan jumlah sampel sebanyak 60 Karyawan. Teknikpengumpulan data menggunakan angket. Teknik analisisdata yang digunakan adalah analisis regresi linier ganda,pengujian hipotesis, uji prasyarat analisis. Hasilpenelitian menunjukkan bahwa : 1) Terdapat pengaruhposisitf dan signifikan komunikasi kerja terhadapproduktivitas kerja. Hal ini ditunjukkan dengan nilaithitung sebesar 4,244 (p < 0,05). 2) Terdapat pengaruhpositif dan signifikan lingkungan kerja terhadapproduktivitas kerja. Hal ini ditunjukkan dengan nilaithitung sebesar 6,708 (p < 0,05). 3) terdapat pengaruhsecara bersama-sama antara komunikasi kerja danlingkungan kerja terhadap produktivitas kerja karyawan.Hal ini ditunjukkan dengan nilai F hitung sebesar 28,914(p < 0,05). Koefisien determinasi (𝑅2) sebesar 0,504 atau54%
Co-Authors . Darwison A Halim Adys, Himaya Praptani Ahmad Faqhruddin Abdur-Rabb Amalia, Sabina Raih Aminuddin S. Aminuddin S. Aminuddin Sulaeman Aminudin Sulaeman Andi Pawawoi Arfita Yuana Dewi Astuti, Diah Retno Dwi Aulia Aulia Baharuddin Baharuddin Basri Bado, Basri Basri, Muh Nur Risky Chitra Yuanisa D. Hamdani D. Hamdani Dedi Harianto DEWI RAHMAWATI Didin Mujahidin Dwi Utami Dzaki Ahmad Fertoni Eka Putra Waldi Emiliano, Emiliano Farizi, AL Fitrilina, Fitrilina Gaffar, Annisa Lukman Gumilang, Harry H, Ahmad. Hamiddin, Muhammad Irwan Hanalde Andre Hanum, Azizah Harfian, Harfian Haviz Yestian Husnul Fajri Insannul Kamil, Insannul Irwan, Muhammad Nur Irwandi Irwandi Jamil, Muh Juhamri, Juhamri Kamarol Mohd Jamil, Mohamad Kamaruddin, Citra Ayni Kurniawan, Septian Ari Kusuma, Tantri Laksono, Heru Dibyo M. Hikita M. Hikita M. Kozako M. Kozako M. Tsuchie M. Tsuchie Magfirah Malik, Muh. Marwan Mardini Hasanah Marsella, Novi Masahiro Kozako Masayuki Hikita Masbur Masbur Melda Latif Mochtar, Hasyim Motoo Tsuchie Muchlis, Nurannisa Sri Febriani Muhammad Imran Hamid Muhammad Syafri, Muhammad Mujahidin, Didin Mumuh Muharam Nabil , Muhammad Nanang Rohadi, Nanang Novizon, Novizon Panglima Ibnu Alfaradhi Purnamasari, Linurya Putra, Andi M. Nur Rabai, Rahmad Rahim, Abd Rahman, Rasyid Rahmawati Fitriyan Ramadhani, Reni Reyhan Maulvi Pradipta Riko Nofendra Riko Novendra Rizki Oktrinanda Elyas Rizky Kencana Putra S. Ohtsuka S. Ohtsuka Saifullah Idris Sari, Jumria Shadry Andriani Silalahi, Julfi Juari Sri Astuti Sri Astuty Sri Utami Subur, Hikmayani Sudaryatno Sudirham Sulaeman, Aminudin Suwarno Suwarno SYAMSU ALAM syauqi, T.M Syukri Yunus Takashi Suzuki Tanra, Mansyur Tesya Uldira Septiyeni Umar K. Umar K. Y. Abe Y. Abe Y.A. Dewa, Nurfadillah. Yusreni Warmi Zulkarnain Abdul-Malek Zulkarnaini Zulkarnaini Zuriman Anthony