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ANALISIS KOORDINASI OVER CURRENT RELAY UNTUK GANGGUAN PHASA DAN TANAH DI PT.KPC (KALTIM PRIMA COAL)
Get PDFANALISIS KOORDINASI OVER CURRENT RELAY UNTUK GANGGUAN PHASA DAN TANAH DI PT. KPC (KALTIM PRIMA COAL)
Rachmad Hidayat Mastian Noor
Email : [email protected]
Dosen pembimbing : Dr. Eng. Ir. I Made Wartana, MT dan Ir. Choirul Saleh, MT
Abstrak
Sistem proteksi sangat penting untuk mengamankan sistem Overland Substation Switchboard di PT. KPC. Oleh sebab itu sistem tenaga listrik di PT. KPC haruslah terkondisi dengan aman. Gangguan yang terjadi adalah gangguan fasa dan tanah yang tidak dapat terhindarkan pada gangguan distribusi external. Rele yang digunakan adalah Overcurrent Relay (OCR) sebagai proteksi pada feeder. Pada sisi 3,4 kV mengalami kegagalan memutus saat gangguan terjadi. Untuk meningkatkan keandalan di PT. KPC, yaitu setting ulang relenya. Kemudian dirubah sesuai perhitungan pada OCR phasa sesudah disetting pada sisi primer 11 kV dengan waktu 0,12 detik dan arus sekunder 2,01 ampere, dan untuk ground dengan waktu 0,07 detik dan arus sekunder 0,3 ampere, kemudian rele OCR phasa sisi sekunder 3,4 kV dengan waktu 0,11 detik dan arus sekunder 5,1 ampere, dan untuk ground dengan waktu 0,17 detik dan arus sekunder 0,8 ampere, agar semakin cepat untuk memotong arus gangguan dan tidak merusak peralatan listrik lainnya.
Kata kunci : Feeder, Gangguan hubung singkat, Overcurrent relay, PT. Kaltim Prima Coal, Sistem distribusi.
ANALYSIS COORDINATION OVER CURRENT RELAY FOR PHASE AND GROUND FAULTS IN PT. KPC (KALTIM PRIMA COAL)
Rachmad Hidayat Mastian Noor
E-mail : [email protected]
Lecturer : Dr. Eng. Ir. I Made Wartana, MT dan Ir. Choirul Saleh, MT
Abstract
Protection system very important to secure system Overland Substation Switchboard in PT. KPC.Therefore system of electricity in PT. KPC shall conditioned safely. Disorder that occurs are impaired the phase and land that cannot be inevitable in disorders of distribution external. Rele used is Over Current Relay (OCR) as protection in feeder. With 3.4 kv experiencing the failure of break when disorder happened.To increase the reliability of in PT. KPC, that is setting repeated his relay. Then make the change in accordance calculation in OCR phase after in setting with primary 11 kv to the time 0.12 seconds and the number of secondary 2.01 ampere, and to ground to the time 0.07 seconds and the number of secondary 0.3 ampere, then rele ocr phasa with secondary 3.4 kv to the time 0.11 seconds and the number of secondary 5.1 ampere, and to ground to the time 0,17 seconds and the number of secondary 0.8 ampere, to be more quick to cut the current disorder and don’t break other electrical equipment.
keywords : Feeder, short circuit, Overcurrent relay, PT. Kaltim Prima Coal, Distibution system
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
PREVALENSI EKTOPARASIT DAN ENDOPARASIT PADA RODENTIA (FAMILI: MURIDAE) DI TAMAN WISATA ALAM SAGO MALINTANG, KABUPATEN LIMAPULUH KOTA, SUMATERA BARAT
Get PDFPenelitian terkait Prevalensi Ektoparasit dan Endoparasit Pada Rodentia (Famili: Muridae) di Taman Wisata Alam Sago Malintang, Kabupaten Limapuluh Kota, Sumatera Barat. Tujuan dari penelitian ini adalah untuk mengetahui jenis-jenis dan prevalensi Ektoparasit dan Endoparasit pada Rodentia serta hubungannya antara keanekaragaman dan ketinggian terhadap nilai prevalensi Ektoparasit dan Endoparasit di Taman Wisata Alam Sago Malintang, Kabupaten Limapuluh Kota, Sumatera Barat. Penelitian ini menggunakan menggunakan metode survey dengancarakoleksi langsung dilapangan. Kerja lapangan telah dilakukan dari bulan Oktober sampaiDesember 2020 dengan menggunakan purpovise sampling pada tiga ketinggian, yaitu low elevation, middle elevation dan high elevation.Hasil penelitian menunjukan bahwa pada hasil pemeriksaan didapatkan 27 individu Rodentia dengan 5 jenis yang ditemukan. UntukEktoparasit dan Endoparasit pada Rodentia di Gunung Sago, didapatkan 13 spesies Ektoparasit serta 6 Spesies Endoparasit dengan nilai diversitas tertinggi yaitu high elevation untuk Ektoparasit dengan nilai 2,014 dan high elevation untuk Endoparasit dengan nilai 1,712.Nilai Prevalensi Tertinggi pada jenis Ektoparasit yaitu Echinolaelaps echidinus sebesar 40,74%. Pada jenis Endoparasit nilai prevalensi tertinggi yaitu Aspiculuris sp., sebesar 14,81%.Hasil analisa hubungan kelas ketinggian terhadap prevalensi Ektoparasit dan Endoparasit memiliki pengaruh yang signifikan antara hubungan kelas ketinggian terhadap prevalensi tetapi tidak berbanding nyata pada masing-masing kelas ketinggian dikarenakan perbedaan kawasan vegetasi dan penyebaran habitat Rodentia
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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