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Dulhadi
Institut Teknologi Nasional Yogyakarta
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PENGARUH SISTEM PENTANAHAN GARDU DISTRIBUSI TERHADAP TEGANGAN SENTUH Dulhadi; Diah Suwarti Widyastuti; Indra Budhi Frebrianto
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.1797

Abstract

Sistem pentanahan pada gardu distribusi diperlukan untuk mengatasi terjadinya tegangan sentuh baik pada transformator maupun benda konduktor lain yang melekat padanya. Batas maksimal tegangan sentuh yang masih dianggap belum membahayakan manusia sebesar 50 volt (PUIL 2000). Salah satu terjadinya tegangan sentuh karena faktor sistem pentanahan yang tidak memenuhi syarat dan adanya aliran arus gangguan hubung singkat pada rangkaian tertutup. Kondisi ini berbahaya bagi manusia yang menyentuhnya dan dapat menyebabkan kematian. Penelitian ini bertujuan membandingkan sistem pentanahan eksisting (Solid Grounding) dan Grid Grounding (baru) pada gardu distribusi untuk mengetahui sistem pentanahan tersebut aman bagi manusia. Metode yang digunakan adalah pengukuran pentanahan eksisting (Sistem Solid Grounding ) dan pengukuran pentanahan pada sistem baru (Grid System Grounding) sejumlah 20 titik sistem terintegrasi. Data hasil pengukuran digunakan untuk menghitung besaran tegangan sentuh pada masing-masing sistem tersebut. Hasil penelitian kondisi pentanahan eksisting sebesar 5,056 ohm dapat menyebabkan tegangan sentuh sebesar 1013,906 Volt serta sistem grid dari hasil uji coba 20 titik didapat 0,16 Ohm dan tegangan sentuh sebesar 42,14 Volt. Kesimpulan yang didapatkan bahwa kondisi sistem pentanahan eksisting belum dapat memperkecil tingkat bahaya tegangan sentuh bagi manusia sedangkan sistem grid dapat mengamankan manusia dari bahaya tegangan sentuh. Kata kunci: Sistem Pentanahan, Tegangan Sentuh, Trafo Distribusi.
KAJIAN STABILITAS SISTEM KELISTRIKAN INDUSTRI Dulhadi Dulhadi; Dewi Indriati Hadi Putri
KURVATEK Vol 5 No 2 (2020): November 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i2.1814

Abstract

This research discusses the dynamic behavior of the operation of several synchronous generators in industrial electrical systems and to find out various factors that affect the stability of the electric power system. This research aims to develop an analysis method of stability that is practical, informative, and quite accurate. The analysis was performed by step by step numerical integration method. Observations were made on the oscillations between rotors, the simultaneity of the generator, the ability and speed of the system to reach a new steady state.The results of this research indicate that electrical system disturbance can cause oscillations between generators which reduce the ability and speed of the system in achieving steady-state conditions. This oscillation creates voltage and frequency fluctuations for a long time. Stability margins can be increased by regulating the burden for each generating unit corresponding with the characteristics and capabilities of each generator, network configuration, and operating load. Simulations of several cases indicate that the generator response to electrical noise very influenced by operating conditions, clearing time, location of disturbance, and changes in network configuration.Keywords: Transient stability, multi-machine system, step by step integration
ANALISIS AWAL KEBAKARAN TANGKI 36 T-102 PERTALITE PADA KAWASAN REFINERY UNIT IV CILACAP – JAWA TENGAH Budi Utama; Wayan Suparta; Dulhadi Dulhadi
KURVATEK Vol 7 No 1 (2022): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v7i1.3129

Abstract

This paper analyzes an induced lightning strike which is thought to have caused a fire in tank 36 T-102 (containing pertalite) at Pertamina refinery unit IV Cilacap – Central Java. This tank fire incident occurred when heavy rain was accompanied by a thunderstorm, on Saturday, November 13, 2021. The statement issued by BMKG that the fire occurred was caused by the phenomenon of lightning induction to the pertalite fuel storage tank, namely lightning induction at the first point a distance of 45 km and at the second point is 12 km. The analysis was carried out by simulation using the Matlab program which was oriented to determine the lightning induced voltage that invades the metal structure of the tank and compares it with the ignition voltage of the 36 T-102 tank. As an indicator parameter for the occurrence of ignition of flammable fuel, simulations of lightning induced voltages as far as 120 meters are also carried out for comparison parameters. The simulation results with comparison indicators revealed that there was a fire in the pertalite fuel tank in tank 36 T-102 it is not caused by lightning strikes as far as 45 km and as farl as 12 km but possibly due to induced lightning strikes in an area as far of hundreds of meters, the sample comparison indicator as far as 120 meters.
APPLICATION OF PHOTOVOLTAIC SOLAR POWER PLANT TO REDUCE OVER LOAD OF DISTRIBUTION SUBTS COMPLEX YOGYAKARTA CITY HALL ARE Dulhadi; Budi Utama
KURVATEK Vol 7 No 2 (2022): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v7i2.3139

Abstract

Kawasan komplek Balai Kota Yogyakarta dipasok listrik PLN 875 KVA dengan arus 3,977 kA, kebutuhan beban maksimal 3,389 kA, sehingga prosentase pembebanan mencapai 85,09 %. Dengan asumsi pertumbuhan beban 1% per tahun dikhawatirkan terjadi kolaps daya listrik, maka perlu penambahan daya listrik agar tidak terjadi kolaps. Potensi sumber daya listrik selain dari PLN yakni pemanfaatan energi baru terbarukan tenaga surya Fotovoltaik. Untuk mengatasi permasalahan tersebut terlebih dahulu dilakukan perencanaan PLTS On Grid. Hasil perencanaan dengan area 1400 m2 didapat daya 204 kWp terdiri 648 panel surya dengan susunan 18 pasangan seri dan 12 paralel. Output tegangan AC pada fase R, S dan T masing – masing 228,63 Volt, 108,2 Ampere. Hasil kontribusi PLTS On Grid dalam bentuk daya AC sebesar 24,74 KVA memberikan tambahan daya 2,8272 %. Penambahan tersebut dapat menghemat biaya operasional sebesar Rp 9.826.300,- per bulan. Kata kunci: Kolaps, Perencanaan PLTS On Grid, Penghematan
Co-Authors Budi Utama Budi Utama Diah Suwarti Widyastuti Hadi Putri, Dewi Indriati Indra Budhi Frebrianto Wayan Suparta