15,524 research outputs found
Classification and localisation of multiple partial discharge sources within high voltage transformer windings
No full textPartial discharge (PD) analysis is a common method for condition monitoring and diagnostics of power transformers, which can be used as a tool for assessing the lifespan of transformers and can detect insulation malfunctions before they lead to failure. This report describes the development of analytical tools for PD activities within HV transformer windings. In most cases, PD will occur in transformer windings due to ageing processes, operational over stressing or defects introduced during manufacture, and different PD sources have different effects on the condition and performance of power equipment insulation system. Therefore, for further analyses, the ability to accurately distinguish between the PD signals generated from different sources is seen as a critical function for future diagnostic systems. Under realistic field conditions, multiple PD sources may be activated simultaneously within the transformer winding. An experiment has been designed to assess different methodologies for the identification and localisation of multiple PD sources within a HV transformer winding. Previous work at Southampton developed a non-linear based technique that facilitates identification of the location of a single PD source within an interleaved winding. It is assumed that any discharge occurring at any point along a winding will produce an electrical signal that will propagate as a travelling wave towards both ends of the winding. This project is concerned with the feasibility of locating several sources simultaneously based only on measurement data from wideband radio frequency current transformers (RFCTs) placed at the neutral to earth point and the bushing tap-point to earth. The proposed processing technique relies on the assumption that the PD pulses generated from different sources exhibit unique waveform characteristics. Due to termination and path taken characteristics, the PD signals will suffer attenuation and distortion during the propagation of the PD signals along transformer windings. Therefore, it will cause changes in the energy characteristics of the PD pulses at both measurement points, which can be used to separate, identify and locate the multiple PDs within an HV transformer winding. Based on analysis of the captured data from experiment, various approaches for identifying multiple PD sources have been assessed. Obtained results indicate that the analysis of absolute energy distributions determined using Mathematical Morphology and the use of OPTICS for clustering will reliably separate PD data from two sources that are simultaneously active within a distributed winding
Hasan Ali tidak keseorangan: Desakan agar Nik Aziz serah jawatan kepada Haron Din
No full textKUALA LUMPUR 14 okt.- Bekas Naib Presiden Pas, Datuk Dr.Hasan Ali tidak berseorangan dalam menyuarakan pandangannya agar
Mursyidul Am Pas, Datuk Nik Abdul Aziz Nik Mat menyerahkan jawatan itu kepada timbalannya, Datuk Haron Din
Multiple partial discharge source discrimination in a high voltage transformer winding
No full textPartial discharge (PD) analysis is an important technique for diagnosis and online monitoring of transformer insulation systems. PD within transformer windings may be due to several causes such as manufacturing defects, degradation of the primary insulation or contamination of the oil. The degradation processes occurring in dielectric insulation components can lead to development of different types of PD source [1], [2]. Multiple PD sources induced by different defects can be simultaneously present within the transformer winding. Therefore, it is necessary to develop tools to separate measurement data from multiple PD sources in order to facilitate separate PD source identification and location to allow accurate condition assessment of the winding. Conventional techniques for multiple PD source separation are based on analysis of the phase resolved PD (PRPD) pattern [3], [4]. However, in the presence of multiple PD sources, PRPD patterns generated by different PD sources can significantly overlap each other [5], [6]. By using PRPD pattern-based techniques, multiple PD sources cannot easily be separated as one PD source can be entirely immersed in the patterns of the other sources. Recently, there have been a number of techniques reported for separating multiple PD sources such as through the use of support vector machines (SVMs) or artificial neural networks (ANNs) [3], [7].This paper reports on a technique that relies on an initial assumption that different PD sources generate different waveform characteristics [8]. The measured discharge current signals from both ends of a transformer winding were decomposed using the Mathematical Morphology (MM) decomposition technique. Then, the energy distribution for each signal for each structure element (SE) length of MM was determined. The OPTICS algorithm was then used as a density based clustering technique to reveal different clusters of signals with similar calculated energy distributions.<br/
Study on RIP current of Pengkalan Datu to Kuala Besar, Kelantan / Nik Ali Nik Cob
No full textRip Current is strong narrow current that flows from the beach towards to the sea. It is one of the main mechanism by which water brought forward to the shore by breaking waves is returned back to the sea to satisfy continuity. Due to its strength and relative difficulty to detect, the presence of rip current is very dangerous especially on beaches used for recreational purposes. The aim of this study is therefore to detect the pattern and location of the rip currents at a selected beach, so as to make it safe for anyone using the beach. Rip currents depend a lot on seabed bathymetry, thus it is also important to relate changes in bathymetry due to sediment transport to shifting of the location of rip currents in the timescale involved
Separation of Multiple Partial Discharge Sources Within a High Voltage Transformer Winding using Time Frequency Sparsity Roughness Mapping
No full textPartial discharge (PD) measurements can evaluate integrity of transformers’ condition insulation system. In high voltage (HV) power transformers, the winding system consists of multiple dielectric media all of which can degrade and subsequently exhibit pre-breakdown behavior, the ability to accurately separate between different PD signals generated from different sources is seen as an important function of diagnostic systems. This paper is concerned with the feasibility of locating two types of PD sources; surface and void discharges simultaneously into a HV transformer winding. Based on the fundamental theory using the theory of travelling waves along passive transmission lines, PD produces a signals that will propagate towards both ends of the transformer winding – the bushing and neutral to earth connection point from the source. Thus this paper is based only on measurement data from two wideband radio frequency current transformers (RFCTs) placed at the bushing tap-point to earth and neutral to earth point. After PD pulse extraction and mathematical morphology (MM)decomposition, time frequency sparsity roughness mapping is applied followed by density-based clustering of application with noise (DBSCAN) to separate multiple PD sources and estimate their location
Rawatan kaunseling terhadap penagih dadah di Rumah Pengasih Kuala Lumpur : satu kajian perbandingan dengan Islam / Nik Asilah binti Nik Ali.
No full textThe Complete Muhammad Ali
No full textIncluding material and photographs not included in most of the 100 other books about the champion, Ishmael Reed's The Complete Muhammad Ali is more than just a biography-it is a fascinating portrait of the 20th century and the beginning of the 21st. An honest, balanced portrayal of Ali, the book includes voices that have been omitted from other books. It charts Ali's evolution from Black Nationalism to a universalism, but does not discount the Nation of Islam and Black Nationalism's important influence on his intellectual development. Filipino American author Emil Guillermo speaks about how "The Thrilla' In Manila" brought the Philippines into the 20th century. Fans of Muhammad Ali, boxing fans, and those interested in modern African American history and the Nation of Islam will be fascinated by this biography by an accomplished American author.Intro -- DEDICATION -- INTRODUCTION -- The Curious History of an Icon -- CHAPTER 1 -- CHAPTER 2 -- CHAPTER 3 -- CHAPTER 4 -- CHAPTER 5 -- CHAPTER 6 -- CHAPTER 7 -- Did the Secret Government Fear a U.S. Muslim/Overseas Muslim Alliance? -- CHAPTER 8 -- CHAPTER 9 -- The Break Between the Prophet and his Disciple -- CHAPTER 10 -- CHAPTER 11 -- CHAPTER 12 -- The GOAT (Greatest Of All Time): Ali or Louis? -- CHAPTER 13 -- The Nation of Islam, the Mob, Showdowns in Canada and Sonny Liston -- CHAPTER 14 -- CHAPTER 15 -- The Taunts: Marketing or Racism? -- CHAPTER 16 -- CHAPTER 17 -- CHAPTER 18 -- CHAPTER 19 -- Boxing and the Brain -- CHAPTER 20 -- Ali's Feet -- CHAPTER 21 -- Mr. Dick -- CHAPTER 22 -- CHAPTER 23 -- The Opening Ceremonies, November 2005 -- CHAPTER 24 -- December 2005, Las Vegas -- CHAPTER 25 -- CHAPTER 26 -- June 16, 2004 -- CHAPTER 27 -- CHAPTER 28 -- CHAPTER 29 -- Aix-en-Provence -- CHAPTER 30 -- Ali as a Black Nationalist -- San Francisco, January 2004 Black Liberation Book Fair -- CHAPTER 31 -- January 31, 2004 -- CHAPTER 32 -- October 2005, Chicago -- CHAPTER 33 -- Why Ali remained with Elijah instead of following Malcolm -- CHAPTER 34 -- CHAPTER 35 -- February 4, 2006, Oakland, California -- CHAPTER 36 -- Like Zeus Descending from Mount Olympus -- CHAPTER 37 -- CHAPTER 38 -- Tuesday, February 28, 2006, New York -- CHAPTER 39 -- Bigger Than Boxing -- CHAPTER 40 -- Tribes Gallery, New York, April 2006 -- CHAPTER 41 -- June 2006, Louisville, Kentucky -- CHAPTER 42 -- CHAPTER 43 -- CHAPTER 45 -- Bad Company -- CHAPTER 46 -- Coxson, A Very Charming Rogue -- CHAPTER 47 -- Ali and the largest embezzlement scheme in Wells Fargo history -- CHAPTER 48 -- CHAPTER 49 -- "Lonnie is a stabilizing force."-Harry Belafonte -- October 29, 2006 -- CHAPTER 50 -- Abdul Rahman -- CHAPTER 51 -- CHAPTER 52 -- CHAPTER 53How Will Ali Be Remembered? New York, January 8, 2005 -- CHAPTER 54 -- CONCLUSION -- AFTERWORD -- Boxers' Rights? -- BIBLIOGRAPHY -- MUHAMMAD ALI -- ISLAM AND NATION OF ISLAM -- BOXING -- RELATED SUBJECTS -- ALSO AVAILABLE FROM BARAKA BOOKSIncluding material and photographs not included in most of the 100 other books about the champion, Ishmael Reed's The Complete Muhammad Ali is more than just a biography-it is a fascinating portrait of the 20th century and the beginning of the 21st. An honest, balanced portrayal of Ali, the book includes voices that have been omitted from other books. It charts Ali's evolution from Black Nationalism to a universalism, but does not discount the Nation of Islam and Black Nationalism's important influence on his intellectual development. Filipino American author Emil Guillermo speaks about how "The Thrilla' In Manila" brought the Philippines into the 20th century. Fans of Muhammad Ali, boxing fans, and those interested in modern African American history and the Nation of Islam will be fascinated by this biography by an accomplished American author.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Maktabat Al Muthanna Baghdad Feb-May 1962
No full textOn the same date, Ali Al-Mansouri issued an official financial statement confirming that the Al-Khanji Foundation owed a total of 11.375.أصدر علي المنصوري بيانًا ماليًا رسميًا بتاريخ 25 نيسان 1962 يُفيد بأن مؤسسة الخانجي مدينة بمبلغ إجمالي قدره 11,375
Evaluating an EDMS : a case study of an engineering design company / Nik Nazaruddin bin Nik Osman & Anisah Ali
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