The Comparative Study of PD Detecting in Power Transformer Model According to Acoustic Emission and IEC270 Standard Method

2015 ◽  
Vol 781 ◽  
pp. 312-315 ◽  
Author(s):  
Pinit Jitjing ◽  
Paran Sritong ◽  
Cattareeya Suwanasri ◽  
Thanapong Suwanasri
Keyword(s):  
Acoustic Emission ◽  
Comparative Study ◽  
Power Transformer ◽  
Graphic User Interface ◽  
Signal Amplifier ◽  
Ae Signal ◽  
Set Up ◽  
Interface Screen ◽  
Transformer Model ◽  
The Comparative Study

This paper presents a comparative study of partial discharge (PD) detection technique of power transformer model. The acoustic emission (AE) method was applied to detect the signal from PD-origin in a model of the power transformer tank according to IEEE standard C57.127. The Time Difference of Arrival (TDOA) technique was additionally applied. In the experiment, a simulated PD-origin was set up inside the transformer tank. Four acoustic sensors were installed on the tank surface, which were used to detect and provide the signal to a signal amplifier and data recorder. Multifunction Compact NI-DAQ 9223 was used together with 1 slot Chassis model 9191 in order to transfer the data to computer by using LAN or wireless system. The AE signal of PD-origin was then collected and analyzed with the Lab View program to identify the location of PD-origin. All physical dimensions of power transformer such as width, length and height and position of each acoustic sensor (in centimeters) were loaded into the main program. Then, the pattern of PD-origin was simulated at different positions in oil-filled transformer tank model. Finally, the localization result was displayed in a graphic user-interface screen. The acquired signal from this method was subsequently compared with the conventional PD detection method using IEC60270 standard in order to observe the PD. The experimental results were satisfactory and could be applied practically.

The Research on Establishing Method of the Broadband Nonlinear Transformer Model

2014 ◽  
Vol 986-987 ◽  
pp. 2031-2034
Author(s):  
Zhong Yuan Zhang ◽  
Zeng Chao Wang ◽  
Xin Zhang
Keyword(s):  
Power Transformer ◽  
Simulation Software ◽  
Transient Simulation ◽  
Iron Core ◽  
Equivalent Transformation ◽  
Measurement Results ◽  
Set Up ◽  
Transformer Model ◽  
Broadband Frequency ◽  
Linear Block

The transformer model is one of the most needed to improving components of the modern transient simulation software. A new nonlinear broadband frequency (50Hz-10MHz) model of power transformer is proposed in this paper. The model is divided into a linear block and a nonlinear block by a reasonable equivalent transformation. The linear block is set up through measuring and synthesizing. And the nonlinear block is derived by the impendence of iron core. The final circuit model is built in Simulink, and the comparisons between the simulation and measurement results verify the feasibility and validity of the model.

The Comparative Study on the Gassy Coal Thermal-Fluid-Solid Coupling and no Coupling

2014 ◽  
Vol 1010-1012 ◽  
pp. 1494-1497
Author(s):  
Tao Qin ◽  
Kai Yun Zhang ◽  
Hong Lei Liu
Keyword(s):  
Comparative Study ◽  
Mathematical Models ◽  
Close Connection ◽  
Dynamic Disaster ◽  
Set Up ◽  
The Comparative Study

In order to study the mechanism of dynamic disaster on gassy coal and realize the monitoring and prediction, with the Didao mine as an example, this paper set up the thermal fluid-solid three field couple mathematical models of driving face and comparative analyzed the mathematical models between couple and not couple by using the software comsol. The study result shows that it has a swift response, a close connection and a shorter time in the formation of o-ring, when it is the thermal fluid-solid three field couple.

scholarly journals Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer

2016 ◽  
Vol 41 (2) ◽  
pp. 265-276 ◽  
Author(s):  
Michał Kunicki ◽  
Andrzej Cichoń ◽  
Sebastian Borucki
Keyword(s):  
Acoustic Emission ◽  
Power Transformer ◽  
Electrical Power ◽  
High Sensitivity ◽  
Laboratory Research ◽  
Time Frequency ◽  
Laboratory Conditions ◽  
Set Up ◽  
Point To Point ◽  
Ae Signals

Abstract An acoustic emission method (AE) is widespread and often applied for partial discharge (PD) diagnostics, mainly due to its ease of application as well as noninvasiveness and relatively high sensitivity. This paper presents comparative analysis of AE signals measurement results archived under laboratory conditions as well as on-site actual AE signals generated by inside PDs in electrical power transformer during its normal service. Three different PD model sources are applied for laboratory research: point to point, multipoint to plate and surface type. A typical measuring set up commonly used for on-site transformer PD diagnostics is provided for the laboratory tasks: piezoelectric joint transducer, preamplifier, amplifier and measuring PC interface. During the on-site research there are three measuring tracks applied simultaneously. Time domain, time-frequency domain and statistical tools are used for registered AE signals analysis. A number of descriptors are proposed as a result of the analysis. In the paper, at- tempt of AE signals descriptors, archived under laboratory condition application possibilities for on-site PD diagnostics of power transformers during normal service is made.

scholarly journals Chemical Analyses of Igneous and Metamorphic Rocks of Denmark, the Faeroes and Greenland. (To and including 1940)

1942 ◽  
Vol 68 ◽  
pp. 1-105
Author(s):  
Sole Munck ◽  
Arne Noe-Nygaard
Keyword(s):  
Comparative Study ◽  
Igneous Rocks ◽  
Geological Survey ◽  
Metamorphic Rocks ◽  
Chemical Analyses ◽  
The Past ◽  
De Quervain ◽  
Set Up ◽  
The Comparative Study

The past ten years or so have seen the publication of collections of chemical rock analyses which, as a result of their clear form of set-up, in many ways faciliate the comparative study of the chemistry of the rocks and their mutual relationships. Among these publications there are: P. Niggli, F. De Quervain & R. U. Wintherthalter: Chemismus schweizerischer Gesteine. Bern 1930, and the analyses publish ed by the Geological Survey of Great Brita in: Chemical Analyses of Igneous Rocks, Metamorphic Rocks and Minerals. London 1931. Similar publications are available from two neighbouring countries, i.e. from Sweden: W. Larsson: Chemical Analyses of Swedish Rocks (Bull. Geol. Inst., Uppsala 1932) and from Finland : L. Lokka: Neuere Chemische Analysen von Finnisch en Gesteinen (Bull. Comm. Geol. de Finlande No. 105. Helsingfors 1934).

THE COMPARATIVE STUDY OF THE APPEARANCE OF ACOUSTIC EMISSION (AE) SIGNALS

1993 ◽  
pp. 471-474
Author(s):  
Jerzy RANACHOWSKI ◽  
Ignacy MALECKI ◽  
Jadwiga RZESZOTARSKA ◽  
Feliks REJMUND
Keyword(s):  
Acoustic Emission ◽  
Comparative Study ◽  
The Comparative Study ◽  
Ae Signals

scholarly journals أهمية كتابة الألفاظ المقترضة من العربية للملايوية بالكتابة الجاوية في تعليم اللغة العربية لمتعلمي اللغة العربية الملايويين

2020 ◽  
Vol 22 (1) ◽  
pp. 139-155
Author(s):  
Yaakob Hasan ◽  
Mariam Daud
Keyword(s):  
Comparative Study ◽  
Descriptive Study ◽  
Arabic Language ◽  
Writing System ◽  
Loan Words ◽  
Full Reference ◽  
Set Up ◽  
The Comparative Study

The history dates years ago that emergence of Islam in Malay Peninsular via trading producing the fraction form of these two languages, where the Malay language loaned various word from the Arabic particularly religion words. Besides, the Malays also used the Arabic alphabets in their writing system and add 5 letters due on the language original voice and they named the writing system as Jawi. On the contrary, the existence of Romanized of Malay language today backlash the Jawi morphology order in which it defers with Arabic language morphology system simultaneously. Thus, this could lead the Malay-Arabic Learners to derangement of study. The purpose of this study is to emphasize the differences between loan words writing in Jawi. The researcher used the descriptive study in the interpretation and analysis of differences in the writings. The researcher also used the comparative study in these two language writings. The study concludes that the loaned words changes in the phonetic and the writing system could lead to the commotion of the Malay learners. It is expected that this study will benefit to the writers of teaching Arabic for the Malay speakers and set up a full reference for the Arabic loan words and clarify the changes phonetically or writing or semantically. ملخص البحث يذكر التاريخ أنّ الإسلام دخل إلى الجزر الملايوية عن طريق التجارة وبطريقة سلمية، وحدث بين اللغة العربية واللغة الملايوية احتكاك لغوي؛ حيث اقترضت اللغة الملايوية الكثير من الألفاظ العربية ومعظمها تتعلق بالدين، كما استخدم الشعب الملايوي الحروف العربية في كتابة لغتهم وزادوا عليها خمسة أحرف بسبب عدم وجود أصوات تلك الحروف في لغتهم وأطلقوا عليها بالكتابة الجاوية، ومن ناحية أخرى نلاحظ في ظل وجود الكتابة الرومية أو اللاتينية أنّ الكثير من الكلمات العربية المقترضة للملايوية أصبحت كتابتها في قواعد الكتابة الجاوية تختلف عن قواعد كتابة اللغة العربية الفصحى، الأمر الذي أدّى إلى تشويش لدى طلبة اللغة العربية الملايويين. وتحاول هذه الدراسة إبراز الأسباب التي أدّت إلى اختلاف كتابة الكلمات المقترضة في الكتابة الجاوية حيث يستعين الباحث بالمنهج الوصفي في تفسير وتحليل الاختلاف في الكتابتين والمنهج المقارن في المقارنة بين النظامين. وقد توصلت الدراسة إلى أنّ الألفاظ المقترضة اعترتها تغييرات صوتية وكتابية الأمر الذي يسبب تشويش لدى متعلمي اللغة العربية الملايويين؛ حيث ينبغي لمؤلفي المناهج التعليمية الاستفادة من هذه الدراسة عند تأليفهم لكتب تعليمية عربية للملايويين كما تقترح الدراسة إيجاد مرجع كامل عن الألفاظ المقترضة من العربية للملايوية توضح جميع التغيرات التي اعترتها سواء الصوتية أو الكتابية أو الدلالية.  

The Optimization of the Pass Structure of Double Regenerative Burner with the Numerical Simulation of Thermal Stress Field

2013 ◽  
Vol 721 ◽  
pp. 671-676
Author(s):  
Fan Zhi Jiang ◽  
Jian Yi Kong ◽  
De Gang Ouyang
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Service Life ◽  
Stress Field ◽  
Comparative Study ◽  
Numerical Simulations ◽  
Thermal Stress Field ◽  
Regenerative Burner ◽  
Set Up ◽  
The Comparative Study

In order to solve the problem of cracks of the double regenerative burner, six kinds of low stress pass structures were newly developed and corresponding 3D CAE models were set up. With the FEM numerical simulations of thermal stress field of various combinations of different pass structures and the comparative study, the optimized pass structure that the thermal stress is relatively lower and thus can improve the service life of burner was determined.

Pandhawa Gubah sebagai Representasi Interaksi Metafisik Manusia Jawa dan Perbandingannya dengan Cheritera Pandawa Lima

Manuskripta ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 67
Author(s):  
Novarina Novarina
Keyword(s):  
Comparative Study ◽  
Literary Theory ◽  
Research Method ◽  
Descriptive Analysis ◽  
Literary Study ◽  
Analysis Method ◽  
Research Objects ◽  
Similarities And Differences ◽  
The Difference ◽  
The Comparative Study

Abstract: This research is a comparative literary study that uses Malay and Javanese versions of Mahabarata text sources. The research objects used were the text edition of Pandhawa Gubah (PG) by Sudibjo Z. Hadisutjipto and the text of Cheritera Pandawa Lima (CPL) by Khalid Hussain. The research method used is descriptive-analysis method. In the comparative study used a comparative literary theory proposed by Endraswara (2011). The results of the text comparison reveal the similarities and differences in the image of Bima figures in the Javanese and Malay versions. The equation as a whole is that both texts contain the same heroic storyline and heroic character, Bima. In addition, Indian influence is still evident in the two texts seen from the nuances of Hinduism that exist in both texts. While the difference is seen in the events that accompany Bima's struggle in achieving his victory. Based on these similarities and differences, it can be seen that the authors attempt to represent the concept of metaphysical interactions vertically and horizontally expressed through PG text. --- Abstrak: Penelitian ini adalah satu kajian sastra bandingan yang menggunakan sumber teks Mahabarata versi Melayu dan Jawa. Objek penelitian yang digunakan adalah edisi teks Pandhawa Gubah (PG) karya Sudibjo Z. Hadisutjipto dan teks Cheritera Pandawa Lima (CPL) karya Khalid Hussain. Metode penelitian yang digunakan adalah metode deskriptif-analisis. Dalam telaah perbandingan digunakan teori sastra bandingan yang dikemukakan Endraswara (2011). Hasil perbandingan teks mengungkapkan adanya persamaan dan perbedaan citra tokoh Bima dalam versi Jawa maupun versi Melayu. Persamaan secara keseluruhan adalah kedua teks tersebut mengandung alur cerita kepahlawanan dan tokoh pahlawan yang sama yaitu Bima. Selain itu, pengaruh India masih tampak dalam kedua teks tersebut dilihat dari nuansa Hinduisme yang ada dalam kedua teks. Sementara perbedaannya tampak pada peristiwa-peristiwa yang menyertai perjuangan Bima dalam mencapai kemenangannya. Berdasarkan persamaan dan perbedaan tersebut tampak adanya upaya penulis untuk merepresentasikan konsep interaksi metafisik secara vertikal dan horizontal yang diungkapkan melalui teks PG.

Sign in / Sign up

Export Citation Format

Share Document