Fungsi Minyak Isolasi Pada Tranformator Yang Berkapasitas Besar

Sekarang seperti kita ketahui, pada era globalisasi kebutuhan akan Tenaga Listrik cenderung sudah merupakan hal yang sangat vital, atau sangat dibutuhkan. Maka keberadaan Gardu Induk pada instalansi listrik PLN khususnya, dan Perusahaan-Perusahaan yangmembutuhkan tenaga listrik pada umumnya, sangat mutlakdiperlukan. Hal ini juga dilakukan pada fungsi minyak trafo. Tujuan penelitian adalah mengetahui cara pemeliharaan minyak isolasi yang baik dan benar untuk dipakai pada transformator yang berkapasitas besar. Hasil Penelitian menunjukkan bahwa Minyak Isolasi adalah merupakan pendingin dari pada belitan yang ada pada trafo dan sekaligus merupakan isolasi antara yang bertegangan dengan body trafo. Pemeliharaan Minyak Isolasi terutama pada trafo nomor 4 di Gardu Induk Kebasen, perlu dilengkapi dengan alat – alat pengamanan agar Minyak Transformator bisa selamat / aman dari gangguan – gangguan yang timbul. Dan Pemeliharaan minyak isolasi perlu persiapan pemikiran urutan kerja, alat–alat bantu, dan pengecekan–pengecekan seperti minyak minyak transformator, tegangan input-output, frekuensi

Rancang Bangun Aktuator Pada Prototype Sistem Peringatan Dini Pengendalian Banjir Dengan Menggunakan Electronic Data Process

Dimasa sekarang, perkembangan dunia teknologi semakin cepat, namun kecanggihan tersebut tidak dapat dilawan oleh kekutan alam. Banjir yang merupakan masalah klasik bagi setiap kota yang ada didunia merupakan bencana yang sering sekali terjadi, yang diakibatkan dari beberapa aspek contohnya adalah humam error. Kecanggihan teknologi dimasa sekarang yang bertumpu pada bidng elektronika dan instrumentasi dpat dijadikan modal awal dalam pengembangan teknologi pengendalian pintu air yang berbasis pada Electronic data process..Metodologi penelitian yang digunakan dalam pembuatan teknologi ini adalah dengan pengumpulan data dari obyek dan menggunakan landasan literatur dengan mempelajari teori – teori dari buku – buku, majalah, internet, maupun tulisan – tulisan yang dapat membantu menyelesaikan masalah dengan menguji kebenaran dari hasil penelitian.Sebagai hasil dari penelitian ini adalah sebuah tekologi pengendalian pintu air yang dapat bekerja menutup dan membuka pintu air berdasarkan tinggi rendahnya permukaan air sungai dalam waktu tertentu secara otomatis. Yang berbasis pada pemrosesan data elektronik atau electronic data process (EDP) dengan aktuator sebagai peran utama dalam mengangkat dan menutup pintu air, dengan terlebih dahulu melalui beberapa proses dari komponen-komponen yang lain sebagai pemicu dalam menggerakan aktuator itu sendiiri

From Spirituality to Social Interaction: Symbolic Communication of Tariqah Qadiriyah wa Naqsyabandiyah Khathibiyah Sambas Adherents

This article aims to analyze the symbolic communication of adherents of the Tariqah Qadiriyah wa Naqsyabandiyah Khathibiyah in Sambas. The paradigm in this study is interpretive with a sociological approach. The method used is phenomenology. Data collection was conducted from March to June 2023. Data were collected by conducting observations, interviews, and documentation. The informants in this study totaled 13 people using the snowball sampling technique. The data obtained were analyzed using qualitative analysis procedures: data reduction, data display, and conclusion. This study found that the symbolic communication of adherents of the Tariqah Qadiriyah wa Naqsabandiyah Khathibiyah Sambas is not formed by itself but through an interrelated process between the meaning of the adherents of the tariqah, the formation of self-concept, and represented in communication patterns. The process is initiated from the adherent's interpretation of the doctrines of the tariqah to form the adherent's self-concept. Then, the self-concept has implications for adherents' behavior and social interactions. Based on the findings, it is concluded that the symbolic communication that occurs among adherents is an implication and symbolic representation of the doctrines and spirituality experiences of adherents of the Tariqah Qadiriyah wa Naqsabandiyah Khathibiyah Sambas. Keywords: Symbolic Communication; Tariqah Qadiriyah wa Naqsabandiyah; Samba

Fungsi Minyak Isolasi Pada Transformator Yang Berkapasitas Besar

Listrik yang merupakan kebutuhan vital bagi kehidupan manusia. Oleh karena itu kebutuhan listrik bagi bangsa Indonesia harus selalu tersedia. Hal ini terlibat oleh negara Indonesia untuk memasok energi listrik adalah PT. PLN (Persero). Untuk mendukung penyediaan tenaga listrik, terutama di daerah perkotaan dibandingkan peralatan Listrik peralatan- di PT. PLN harus selalu dalam kondisi baik dan prima. Salah satu peralatan listrik yang harus dipertahankan dalam kondisi baik dan sebuah transformator utama dan trafo distribusi listrik biasa disebut transformator berkapasitas besar, transformator yang berfungsi untuk mengubah dari tegangan tinggi (150 kV) menjadi tegangan menengah (20 kV) . Kemudian di tengah-tengah Perubahan tegangan ke tegangan rendah (380 V) untuk penggunaan selanjutnya dalam rumah tangga konsumen dan sebagainya. Jadi untuk menjaga keandalan transformator yang harus dijaga salah satunya adalah minyak isolasi dalam transformator. isolasi minyak berfungsi untuk mendinginkan gulungan primer dan sekunder kawat yang ada di transformator dan juga berfungsi untuk mengisolasi keterikatan antara gulungan primer dan sekunder dan juga antara tubuh trafo

Study of implosion in an attractive Bose-Einstein condensate

By solving the Gross-Pitaevskii equation analytically and numerically, we reexamine the implosion phenomena that occur beyond the critical value of the number of atoms of an attractive Bose-Einstein condensate (BEC) with cigar-shape trapping geometry. We theoretically calculate the critical number of atoms in the condensate by using Ritz's variational optimization technique and investigate the stability and collapse dynamics of the attractive BEC by numerically solving the time dependent Gross-Pitavskii equation

Effectiveness of Newer Tip Design of Laser in Removing the Smear Layer at the Apical Third of Curved Root Canals: An Ex Vivo study

The purpose of this ex vivo study was to investigate the effectiveness of newer tip design of Er,Cr:YSGG laser in removing the smear layer at the apical third of curved root canals. A total of 81 freshly extracted single rooted intact human mandibular premolars teeth with 15-30º canal curvature were selected for the study and were decoronated at the level of cemento enamel junction. The roots were divided in to three main groups with 27 samples each. GROUP I - Irrigants not activated by laser (non lased group). GROUP II - Irrigants activated by Er,Cr:YSGG laser with plain tip and GROUP III-Irrigants activated by Er,Cr:YSGG laser with conical tip and each group were further divided in to three sub groups of 9 samples each with EDTA, CHX, NaOCl respectively. In all the three groups, Canals were prepared with rotary nickel-titanium (Ni-Ti) instruments to a working length 1 mm short of the apex to size F3 by using Protaper instruments. In Group I the canal was irrigated with 17% EDTA, 2% Chlorhexidine and 3% NaOCl without laser irradiation, where as in Group II and Group III the canal was irrigated with 17% EDTA, 2% Chlorhexidine and 3% NaOCl respectively with Plain and conical fiber tips was placed 5mm from the apex in the root canal and the appropriate irrigant solution was then activated for 20 second. The teeth were then grooved longitudinally with a diamond disc on their buccal and lingual surfaces and were split into two halves with a chisel and mallet. The split half of the tooth in which apex was most visible used for SEM evaluation at 1000 X magnification and smear layer scoring was done using Torabinejad’s scoring system. The result of the present study were subjected to statistical analysis to interpret the smear layer removal in each group and also between the groups. ONE-WAY ANOVA followed by POST HOC TUKEY HSD test was used for statistical analysis in the present study. CONCLUSION: Within the limitations of this ex vivo study it can be concluded that: 1. Er,Cr:YSGG laser with conical fiber tip performed better removal of smear layer in the apical third of the curved root canal system. 2. Conical fiber tip performed better than plain fiber tip for removing smear layer in the apical third of the curved root canal system. 3. Among the irrigants used EDTA showed better effectiveness in smear layer removal followed by CHX and NaOCl in the apical third of the curved root canal system. This suggests that to ensure complete removal of smear layer from the root canal system it may be prudent to activate EDTA with conical tip design of Er,Cr:YSGG laser during irrigation protocol in the curved root canals

Harmonics Minimization Of A Three Phase Cascaded H-Bridge Multilevel Inverter

For more than two decades, multilevel inverter technology has drawn tremendous interest among researchers from industry and academia in recent years due to its superior performance. In this regards,the main objectives of this this thesis are to study, modeling, design and develop a prototype of a three-phase cascaded H-Bridge Multilevel inverter (CHB-MLI) based on Newton-Raphson technique that aims to analyze the performance of the inverter output for harmonic minimization. The source codes programming based on Newton-Raphson method was developed, and then stored into the Digital Signal Processing (DSP) TMS320F2812. The proposed controller based on Newton Raphson was applied to CHB-MLI. The optimization of this system had managed to minimize the harmonic contents of the inverter output. Besides, the experimental results of the developed prototype are discussed. In addition, the performance of the proposed system was compared between simulation and experimental results for both Optimization and Non-optimization techniques. The Optimization of this system had been capable in reducing the harmonic contents of the inverter output. Thus, optimization and Non-optimization of the CHB-MLI system had been successfully demonstrated in this study. Finally the development of a three phase CHB-MLI based on DSP, its controller and power electronic devices would be a challenging future research in minimize the content of harmonic of the inverter output

THE SPATIAL PATTERN OF URBANIZATION AND SMALL CITIES DEVELOPMENT IN CENTRAL JAVA: A CASE STUDY OF SEMARANG-YOGYAKARTA-SURAKARTA REGION

The special form of urbanization in Indonesia has led to a variety of themes on the urban development studies in Indonesia. Since 1990s, there has been an emphasis on the development of mega-urban regions, particularly those surrounding Jakarta as the biggest and the prime city in Indonesia. This research is aimed at elaborating the previous knowledge on the urbanization pattern in Indonesia, and Java in particular. More specifically, this study examines urban development trend in Central Java. The analysis of urbanization in this study can be classified into two categories, i.e. analysis of the urbanization level and analysis of the urbanization growth. These two analyses are combined by applying some GIS methods in order to understand the pattern of urbanization in the region. It is found that the urbanization process in Central Java has transformed the predominantly rural regions in the 1980s into the urban ones. The rapid growth of urban population forms some observable pattern that may be different to the national pattern. There are common spatial patterns, such as the importance of the coastal region and the essential role of the larger urban centers in the urbanization. In this regards, the emergence of the smaller centers has also contributed to the process, especially in bridging a more balanced development between major urban centers and their respective rural hinterland