HUMIDITY INFLUENCES ON THE BREAKDOWN OF ROD-PLANE GAPS UNDER POSITIVE IMPULSES IN ATMOSPHERIC AIR
|
|
- Laureen Bradford
- 6 years ago
- Views:
Transcription
1 HUMIDITY INFLUENCES ON THE BREAKDOWN OF ROD-PLANE GAPS UNDER POSITIVE IMPULSES IN ATMOSPHERIC AIR P. N. Mikropoulos and C. A. Stassinopoulos Department of Electrical and Computer Engineering, Aristotelian University of Thessaloniki, Thessaloniki, Greece Introduction For many years there has been a growing interest in understanding the influence of the atmospheric conditions and particularly of the absolute humidity on the breakdown mechanism of air-insulated high voltage systems. It has been recognised that the previous correction procedure IEC-60 [1], allowing measurements of breakdown voltages to be referred to a standard humidity level had shortcomings [2 6]. For that reason new IEC standards [7] emerged based on a semi-physical model as was suggested by Feser and Pigini [4]. Although the new standard has more applicability it was proposed that the short gap clearances should be regarded as exceptions from the new correction procedure [4, 8] or that a different correction procedure should be more appropriate for short gaps [9, 10]. Besides, it is believed [5, 11& 12] that there is a lack of data regarding the effect of humidity on air breakdown for short gaps. This paper contributes such data referring to the variation of the 50% breakdown voltage and of the humidity correction factor for rod-plane gaps with the spacing, the geometry of the tip of the rod and with the wavefront duration of the positive applied impulse voltages. Experimental arrangement A 4-stage, 560kV, 1kJ Marx generator produced impulse voltages with wavefront varying from 2 to 250ìs and wavetail around 2000ìs, including the "normal" switching waveshape 250/2500ìs [7]. The gap consisted of a cylindrical brass rod with a diameter of 23mm hanging over an earthed aluminium 2x2m plane placed 80cm above the floor of the laboratory. Two gap lengths, 25 & 50cm, and three types of interchangeable rod tips have been used: a conical tip with a 30 o end, a square-cut tip and a hemispherical tip. The atmospheric conditions were not artificially controlled as humidity was found to vary normally achieving values between 2.4 and 21g/m 3. Class 1 (multiple-level) tests [7] were performed in order to obtain breakdown probability curves "p(u)" and thus to determine the values of the 50% breakdown voltages "U 50 " and of the standard deviation. These tests were executed for breakdown probabilities from 0 to 1 with groups of twenty applied impulses per voltage level and for six, at least, values of absolute humidity per gap-impulse configuration. Each voltage level differed by about 2 3% from
2 the previous one. All the voltages were corrected for air density according to the standards [7]. Information on the discharge was obtained by the oscillographic monitoring of the electric field at the centre of the plane. Results and discussion The p(u) curves were compared to both the Gauss and Weibull cumulative distributions. It appeared that the fit with the Gaussian cumulative was best for probabilities from whereas the fit with the Weibull cumulative was best for probabilities between However, in some cases, nongaussian probability distributions were seen to exist. Typical examples of this can be seen in Fig Ucr(kV), 40/1900ìs, 50cm, square-cut tip. Fig. 1: Fitting with the Gauss (solid) and Weibull (dashed) cumulative distribution of the p(u) curve for two values of absolute humidity. 17.9gm gm tf (ì s) 25C 25S 25H Fig. 2: Frequency(%) of deviation from the Gauss cumulative distribution of the p(u) curves vs front duration. 25cm gaps. The relative frequency of the non Gaussian probability distributions for the 25cm gaps is shown in Fig. 2 with the tip of the rod and the front duration "t f " as parameters. From this figure it can be seen that the deviation from the Gauss distribution becomes more frequent for intermediate wavefronts and for gaps with square-cut tip of the rod. Besides, it was found that the non-gaussian distributions increase in number with increasing humidity (Fig. 1) and with decreasing gap spacing. Since the breakdown mechanism for short gaps is governed by the pre-discharge phenomena it is the authors' opinion that the deviations of the p(u) curves from the Gauss distribution are related with the amount and the position of the positive space charge injected by the initiation of the first corona in conjunction with the rate of drifting of the latter away from the vicinity of the rod towards to the plane. For short wavefronts the large amount of the positive space charge of the first corona due to the high inception voltages inhibits the development of a leader resulting in breakdown to occur mainly with streamers under higher voltages. For long front durations the injected space charge of the first corona is significant less thus allowing breakdown to take place always through a leader channel and thus under lower voltages.
3 In the case of intermediate wavefronts a transition exists from a streamer to a leader dominated breakdown mechanism resulting in deviations from the Gauss distribution. This transition is depended also on the electrode profile, the gap length and on humidity. All the U 50 breakdown voltages, obtained through the Gaussian cumulative distributions, were linked with the corresponding values of absolute humidity and a linear correlation was found to exist. Besides breakdown voltages always attained bigger values with increasing humidity. Typical examples of such linear regressions of U 50 over humidity involving the best correlation coefficient and the poorest one can be seen in Fig. 3. In order to estimate the influence of humidity and the dependence of the latter on the Fig. 3: Linear regression of U 50 over humidity. The vertical bars represent the corresponding standard deviations. gap configuration and on the front duration the percentage of correction of the U 50 per g/m 3 of absolute humidity has been computed by finding a per cent correction factor "k s " from the equation: k s s x 100 U n50. In this equation "s" is the slope of the straight lines produced via the linear regression of U 50 over humidity and "U n50 " represents the values of the 50% breakdown voltage for a normal humidity (11g/m 3 ) obtained from these. Figs. 4 and 5 relate the humidity correction factors k s to the front duration for the 25 and 50cm gaps respectively with the tip of the rod as parameter. Fig. 4: k s (%) vs front duration. 25cm gaps. Fig. 5: k s (%) vs front duration. 50cm gaps. Since leader channel has a bigger conductivity ( 1kV/cm) as compared with the streamers ( 5kV/cm) the important parameter at breakdown for the gaps tested becomes the proportion of the gap that is bridged by either type of discharge. Also, it was established that the
4 bigger the part of the gap occupied by streamers the larger the influence of humidity on U 50 [12, 13]. For short wavefronts due to the large inhibitory action of the first corona the gap is mainly traversed by streamers. For longer wavefronts due to the smaller injected space charge of the first corona breakdown occurs through a leader propagating with a large amount of steps (leader coronas). Thus in both these categories the main proportion of the gap is bridged by streamers either directly (short t f, with no leader formation) or cumulative (longer t f, due to leader coronas) resulting in high values of k s (Figs. 4 & 5). For intermediate front durations the amount of the charge of the first corona, depending on the tip of the rod and on the gap length, either allows the development of a leader of some length propagating continuously (50cm conical tip) or causes the initiation of the second corona to occur near the crest of the impulse thus resulting in breakdown to take place without any subsequent coronas. This results in smaller values of k s (Figs. 4 & 5). With decreasing gap spacing the influence of humidity on the breakdown voltage becomes more strictly related with the influence of the latter on the pre-discharge phenomena. Thus the influence of the tip of the rod on k s becomes more marked as the gap length reduces and also the dependence of k s on the electrode profile can be explained by the same observed influence of humidity on the inception voltage of the first corona. Conclusions For short gaps the transition from a streamer to a leader dominated breakdown mechanism results in non-gaussian distribution functions for the breakdown voltages. The dependence of k s on front duration and on gap configuration and its variability, its values ranging between 1.3 and 0.2, contrast sharply with I.E.C. [7] which supposes a constant value equal to 1. Thus this paper confirms that the short clearances should be regarded as exceptions from the new correction procedure and that a different correction procedure should be more appropriate for short gaps. References [1] IEC Publication 60-1, 1973 [2] AIHARA, Y., HARADA, T., AOSHIMA, Y., ITO, Y.: "Impulse flashover characteristics of long air gaps and atmospheric correction". IEE Trans., 1978, PAS-97, No. 2, pp [3] AIHARA, Y., WATANABE, Y., KISHIZINA, J.: "Analysis of new phenomena regarding effects of humidity on flashover characteristics for long air gaps", IEEE Trans., 1983, PAS-102, No. 12, pp [4] PIGINI, A., SARTORIO, G., MORENO, M., RAMIREZ, M., CORTINA, R., GARBAGNATI, E.: "Influence of air density on the impulse strength of external insulation". IEEE Trans. 1985, PAS-104, No. 10, pp [5] ALLEN, N.L.: "Corona, breakdown and humidity in the rod-plane gap". IEE Proc., 1986, 133, No 8, pp [6] FESER, K., PIGINI, A.:"Influence of atmospheric conditions on the dielectric strength of external insulation". Electra, 1987, 112, pp
5 [7] IEC Publication 60-1, 1989 [8] STASSINOPOULOS, C.A., ANDREADOU, K, and SERGAKI, A.: "Influence of humidity on the breakdown mechanism of small rod-plane gaps stressed by positive impulse voltages". etzarchiv, 1990, 12, pp [9] MATALLAH, M., TURRI, R., DAVIS, A.J., and WATERS, R.T.: "Atmospheric correction factor for positive switching impulse breakdown voltages". 7th International Symposium on High Voltage Engineering, Dresden, 1991, paper [10] GELDENHUYS, H.J.: "The breakdown voltage of air in a 50cm rod-plane gap over a practical range of air density and humidity". 5th International Symposium on High Voltage Engineering, Braunschweig, 1987, paper [11] DAVIS, A.J., MATALLAH, M., and WATERS, R.T.: "The effect of humidity on the positive impulse breakdown characteristics of rod/plane and sphere/plane air gaps". Proc. 10th Int. Conf. on Gas Discharges and Their Applications, Swansea, 1992, 1, pp [12] MIKROPOULOS, P.N., and STASSINOPOULOS, C.A.: "On the influence of humidity on the breakdown mechanism of medium length rod-plane gaps stressed by positive impulse voltages". IEE Proc. -Sci. Meas. Tecnol., 1994, 141, No 5, pp [13] FESER, K., and SCHMID, J.: "Influence of atmospheric conditions on the impulse breakdown of rodplane gaps". Proc. 5th Int. Symp. on High Voltage Engineering, Braunschweig, 1987, paper 11.01
IMPULSE BREAKDOWN OF SHORT ROD-PLANE GAPS WITH A ROD COVERED WITH DIFFERENT DIELECTRIC MATERIALS
16th International Symposium on High Voltage Engineering, Cape Town, South Africa, 2009, paper No. 271 IMPULSE BREAKDOWN OF SHORT ROD-PLANE GAPS WITH A ROD COVERED WITH DIFFERENT DIELECTRIC MATERIALS P.
More informationDynamics of streamer propagation in air
J. Phys. D: Appl. Phys. 32 (1999) 913 919. Printed in the UK PII: S0022-3727(99)96805-5 Dynamics of streamer propagation in air N L Allen and P N Mikropoulos Department of Electrical Engineering and Electronics,
More informationTHE EARLY STREAMER EMISSION PRINCIPLE DOES NOT WORK UNDER NATURAL LIGHTNING!!
IX International Symposium on Lightning Protection 26 th -30 th November 2007 Foz do Iguaçu, Brazil THE EARLY STREAMER EMISSION PRINCIPLE DOES NOT WORK UNDER NATURAL LIGHTNING!! Marley Becerra Vernon Cooray
More informationThe leader propagation velocity in long air gaps
The leader propagation velocity in long air gaps Liliana Arevalo, Dong Wu Research and development ABB Power Grids, HVDC Ludvika, Sweden Liliana.Arevalo@se.abb.com Pasan Hettiarachchi, Vernon Cooray, André
More informationCopyright 2014 IEEE. Paper presented at 2014 IEEE conference on electrical insulation and dielectric phenomena, Des Moines, USA, October, 2014.
Copyright 2014 IEEE Paper presented at 2014 IEEE conference on electrical insulation and dielectric phenomena, Des Moines, USA, 19-22 October, 2014. This material is posted here with the permission of
More informationPreliminary study on the modeling of negative leader discharges
Author manuscript, published in "Journal of Physics D: Applied Physics 44, 31 (011) 31504" DOI : 10.1088/00-377/44/31/31504 Preliminary study on the modeling of negative leader discharges Arevalo and V
More informationSimulation of Prebreakdown Phenomena in Air Gaps of Rod Plane Configuration of Electrodes
Simulation of Prebreakdown Phenomena in Air s of Rod Plane Configuration of Electrodes V. P. CHARALAMBAKOS, C. P. STAMATELATOS, D. P. AGORIS, E. C. PYRGIOTI Department of Electrical and Computer Engineering
More informationElectrical Discharge Characteristics of 1-D Plane Micro-electrodes
Proc. ESA Annual Meeting on Electrostatics 2008, Paper C3 1 Electrical Discharge Characteristics of 1-D Plane Micro-electrodes Poornima A*, Mithila H*, Adnan B, Subhankar D, Balachandra TC *, Asokan T
More informationCOMPARATIVE EVALUATION OF BREAKDOWN STRENGTH OF NATURAL ESTERS AND MINERAL OIL
COMPARATIVE EVALUATION OF BREAKDOWN STRENGTH OF NATURAL ESTERS AND MINERAL OIL D. Vukovic * and S. Tenbohlen Institute of Power Transmission and High Voltage Technology Universität Stuttgart, Pfaffenwaldring
More informationCHAPTER 2 ESTIMATION OF BREAKDOWN VOLTAGES IN SMALL INSULATION GAPS AN EMPIRICAL APPROACH
17 CHAPTER 2 ESTIMATION OF BREAKDOWN VOLTAGES IN SMALL INSULATION GAPS AN EMPIRICAL APPROACH 2.1 INTRODUCTION Insulation materials of different types viz. gaseous, liquid and solid are used to make the
More informationExponential Expression of Relating Different Positive Point Electrode for Small Air Gap Distance
Research Journal of Applied Sciences, Engineering and Technology 2(6): 512-518, 2010 ISSN: 2040-7467 Maxwell Scientific Organization, 2010 Submitted Date: April 17, 2010 Accepted Date: June 14, 2010 Published
More informationEffect of High Voltage Impulses on Surface Discharge Characteristics of Polyethylene
9 th Nordic Insulation Symposium on Materials, Components and Diagnostics Effect of High Voltage s on Surface Discharge Characteristics of Polyethylene Roya Nikjoo, Nathaniel Taylor, Hans Edin School of
More informationBREAKDOWN STUDY OF WATER WITH DIFFERENT CONDUCTIVITIES
BREAKDOWN STUDY OF WATER WITH DIFFERENT CONDUCTIVITIES 1 S. THIVYA, 2 V. GOWRI SREE 1 M.E. High Voltage Engineering, Department of Electrical and Electronics Engineering, College of Engineering Guindy,
More informationOR Explain thermal breakdown in solid dielectrics. How this mechanism is
Subject : High Voltage Engineering (2090) ITM Universe, Vadodara Electrical Engineering Department Class : Electrical Sem : th Long Questions Sr. No Question Unit No : 0 Explain Charge Simulation method
More informationA New Model of Investigating the Electric Field in Dielectric Liquid for Streamer Initiation
A New Model of Investigating the Electric Field in Dielectric Liquid for Streamer Initiation E A. El-Zein and M. Talaat Electrical Power & Machines Department, Faculty of Engineering, Zagazig University,
More informationTHE APPROACH TO THE ANALYSIS OF ELECTRICAL FIELD DISTRIBUTION IN THE SETUP OF PAPER INSULATED ELECTRODES IN OIL
THE APPROACH TO THE ANALYSIS OF ELECTRICAL FIELD DISTRIBUTION IN THE SETUP OF PAPER INSULATED ELECTRODES IN OIL Pawel Rozga, PhD Dariusz Hantsz, MSc Technical University of Lodz, Poland Abstract Article
More informationOn Designing of a High Voltage Standard Capacitor Using a Semi-Analytical Field Computation Method
Proc. 2016 Electrostatics Joint Conference 1 On Designing of a High Voltage Standard Capacitor Using a Semi-Analytical Field Computation Method N. K. Kishore Professor, Dept. of Electrical Engineering
More informationEffect of Humidity on the Flashover Voltage of Insulators at Varying Humidity and Temperature Conditions
4299 J. Basic. Appl. Sci. Res., 2(4)4299-4303, 2012 2012, TextRoad Publication ISSN 2090-4304 Journal of Basic and Applied Scientific Research www.textroad.com Effect of Humidity on the Flashover Voltage
More informationEFFECT OF DIELECTRIC BARRIERS TO THE ELECTRIC FIELD OF ROD-PLANE AIR GAP
EFFECT OF DIELECTRIC BARRIERS TO THE ELECTRIC FIELD OF ROD-PLANE AIR GAP A. Kara 1, Ö. Kalenderli, K. Mardikyan 3 1,, 3 Istanbul Technical University, Electrical and Electronics Engineering Faculty, Istanbul,
More informationEXPERIMENT REFERENCE SHEET ALTERNATING VOLTAGES
ALTERNATING VOLTAGES Pages: 149 to 153 No. 1 B SCOPR OF SUPPLY (COMPONENTS LIST) Measuring Capacitor CM 100 HV9141 1 Connecting Rod V HV9108 2 Connecting Cup K HV9109 2 Floor pedestal F(S) HV9110 1 Motorized
More informationRecent Improvements in K-Factor Models
1 Recent Improvements in K-Factor Models Yixin Zhang NEETRAC, Georgia Institute of Technology 2014 IEEE PES Panel Session Discussions on IEEE Std.4-2013: High-Voltage Testing Techniques 2 Related Standards
More informationCode No: RR Set No. 1
Code No: RR410209 Set No. 1 1. What are the gases mainly used in insulating medium at high pressures? Which is more suitable? Why? What about its dielectric strength? Explain. [16] 2. (a) Define time lags
More informationModeling of Transmission Line and Substation for Insulation Coordination Studies
TRAINING DUBROVNIK, CROATIA - APRIL, 27-29 2009 SIMULATION & ANALYSIS OF POWER SYSTEM TRANSIENTS WITH EMTP-RV Modeling of Transmission Line and Substation for Insulation Coordination Studies Prof. Ivo
More informationSimulation of Partial Discharge in Solid Dielectric Material
IJSRD - International Journal for Scientific Research & Development Vol. 2, Issue 03, 2014 ISSN (online): 2321-0613 Simulation of Partial Discharge in Solid Dielectric Material Vishal Dayaram Kahar 1 Ch.V
More informationEFFECT OF EARTH DISCONTINUED TO THE ELECTRICAL FIELD DISTRIBUTION IN ROD-PLANE AIR GAPS UNDER LIGHTNING IMPULSE. A. Khechekhouche and D.
Journal of Fundamental and Applied Sciences Research Article ISSN 1112-9867 Available online at http://www.jfas.info EFFECT OF EARTH DISCONTINUED TO THE ELECTRICAL FIELD DISTRIBUTION IN ROD-PLANE AIR GAPS
More informationA Roadmap for Evaluation of Lightning Elimination Technologies
Non-Conventional Lightning Mitigation: Fact or Fiction? A Roadmap for Evaluation of Lightning Elimination Technologies IEEE PES 2003 General Meeting July 16, 2003 Purpose of Talk Review methods that have
More informationThe influence of the Effect of Grounding and Corona Current to the Field Strength the Corona Onset and the Breakdown Voltage of Small Air Gaps
The influence of the Effect of Grounding and Corona Current to the Field Strength the Corona Onset and the Breakdown Voltage of Small Air Gaps LEANDROS A. MAGLARAS, ATHANASIOS L. MAGLARAS, Electrical Engineering
More informationInvestigation of space charge in low-density polyethylene using a field probe technique
Downloaded from orbit.dtu.dk on: Nov 05, 2018 Investigation of space charge in low-density polyethylene using a field probe technique Khalil, M. Salah; Hansen, Bo Svarrer Published in: IEEE Transactions
More informationJournal of Electrostatics
Journal of Electrostatics 70 (01) 15e19 Contents lists available at SciVerse ScienceDirect Journal of Electrostatics journal homepage: www.elsevier.com/locate/elstat A new static calculation of the streamer
More informationAdaptive numerical simulation of Streamer. Shailendra Singh
Adaptive numerical simulation of Streamer Shailendra Singh Tools: BDV from Drift diffusion calculation Motivation: Streamer criteria works very well in moderately uniform field. But in highly non uniform
More informationThe Lightning Study of Overhead Transmission Lines
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 232-3331, Volume 1, Issue 5 Ver. II (Sep Oct. 215), PP 69-75 www.iosrjournals.org The Lightning Study of Overhead
More informationA Novel Analytical Expressions Model for Corona Currents Based on Curve Fitting Method Using Artificial Neural Network
Progress In Electromagnetics Research M, Vol. 41, 51 62, 2015 A Novel Analytical Expressions Model for Corona Currents Based on Curve Fitting Method Using Artificial Neural Network Gao Hui Fan*, Shang
More informationOnset voltage of negative corona on dielectric-coated electrodes in air
INSTITUTE OF PHYSICS PUBLISHING OURNAL OF PHYSICS D: APPLIED PHYSICS. Phys. D: Appl. Phys. 38 (5) 343 3411 doi:1.188/-377/38/18/13 Onset voltage of negative corona on dielectric-coated electrodes in air
More informationElectric Field and Potential Distributions along Non-Ceramic Insulators with Water Droplets. Integrated Engineering Software - Website Links
Electric Field and Potential Distributions along Non-Ceramic Insulators with Water Droplets ABSTRACT The electric field and potential distributions along wet non-ceramic insulators are calculated using
More informationEXPERIMENTAL DEVELOPMENTS ON SOIL IONIZATION: NEW FINDINGS
GROUND 2008 & 3 rd LPE International Conference on Grounding and Earthing & 3 rd International Conference on Lightning Physics and Effects Florianopolis - Brazil November, 2008 EXPERIMENTAL DEVELOPMENTS
More informationThe phenomenon of Ground Effect in contradiction to the Polarity Effect in rod plate air gaps.
The phenomenon of Ground Effect in contradiction to the Polarity Effect in rod plate air gaps. ATHANASIOS MAGLARAS, LEANDROS MAGLARAS Electrical Engineering Department Technological Educational Institute
More informationNumerical modelling of positive electrical discharges in long air gaps
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1389 Numerical modelling of positive electrical discharges in long air gaps OSCAR DIAZ ACTA UNIVERSITATIS
More informationUNCERTAINTIES IN THE APPLICATION OF ATMOSPHERIC AND ALTITUDE CORRECTIONS AS RECOMMENDED IN IEC STANDARDS
Paper Published on the16th International Syposiu on High Voltage Engineering, Cape Town, South Africa, 2009 UNCERTAINTIES IN THE APPLICATION OF ATMOSPHERIC AND ALTITUDE CORRECTIONS AS RECOMMENDED IN IEC
More informationEvaluation of the risk of failure due to switching overvoltages of a phase to phase insulation
Evaluation of the risk of failure due to switching overvoltages of a phase to phase insulation A. Xemard, J. Michaud, A. Guerrier, I. Uglesic, G. Levacic, M. Mesic Abstract-- The upgrade of an overhead
More informationParticle Intiated Breakdown Inside Gas Insulated Switchgear for Various Gases Mixtures
International Journal on Electrical Engineering and Informatics Volume 4, Number 2, July 212 Particle Intiated Breakdown Inside Gas Insulated Switchgear for Various Gases Mixtures Sayed A. Ward 1, M. A.
More informationElectric Field Stress Calculation on High Voltage Insulator
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 2320-3331, PP 65-69 www.iosrjournals.org Electric Field Stress Calculation on High Voltage Insulator Krutika
More informationEPRI Lightning Protection Design Workstation
EPRI Lightning Protection Design Workstation Tom McDermott Electrotek Concepts, Inc. 2000 Winter Power Meeting LPDW v5 Components Includes 1988-97 flash data from the National Lightning Detection Network
More informationI n many cold-climate regions of the world, overhead
Influence of Air-Gap Length and Position on the Flashover Performance of Ice-Covered Insulators under Switching Overvoltage T. Guerrero, J. Zhang, and M. Farzaneh NSERC / Hydro-Quebec / UQAC Industrial
More informationLightning Effect on Scaled Protected and Un-Protected Building Structures and the Air Terminal Bypasses
Indonesian Journal of Electrical Engineering and Computer Science Vol.11, No.1, July 2018, pp. 182~186 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v11.i1.pp182-186 182 Lightning Effect on Scaled Protected and
More informationModelling Of Mathematical Equation for Determining Breakdown Voltage
2013 First International Conference on Artificial Intelligence, Modelling & Simulation Modelling Of Mathematical Equation for Determining Breakdown Voltage Muhammad S. Laili, Noradila Yusof School of Electrical
More informationFlashover Performance of Station Post Insulators under Icing Conditions based on Electric Field Distribution
Flashover Performance of Station Post Insulators under Icing Conditions based on Electric Field Distribution V. Jaiswal and M. Farzaneh NSERC / Hydro-Quebec / UQAC Industrial Chair on Atmospheric Icing
More informationTHE grounding resistance decreases as injected current
194 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 21, NO. 1, JANUARY 2006 Current-Dependent Grounding Resistance Model Based on Energy Balance of Soil Ionization Shozo Sekioka, Maria I. Lorentzou, Maria P.
More informationDETERMINATION OF THE DIELECTRIC STRENGTH OF LPS COMPONENTS BY APPLICATION OF THE CONSTANT-AREA-CRITERION
X International Symposium on Lightning Protection 9 th -13 th November, 29 Curitiba, Brazil DETERMINATION OF THE DIELECTRIC STRENGTH OF LPS COMPONENTS BY APPLICATION OF THE CONSTANT-AREA-CRITERION Ottmar
More informationAn Innovative Simple Test Circuit for Single-Phase Short Circuit Making Test of High-Voltage Switching Devices
An Innovative Simple Test Circuit for Single-Phase Short Circuit Making Test of High-Voltage Switching Devices Downloaded from jiaeee.com at 2:32 +33 on Sunday November 4th 28 Abstract: N. Nikpour K. Niayesh
More informationHIGH VOLTAGE ENGINEERING. Electric discharges in electric power engineering
HIGH VOLTAGE ENGINEERING Electric discharges in electric power engineering Corona discharge There is suddenly an overall flashover between electrodes in a uniform electric field In case of nonuniform configurations,
More informationhttp://www.diva-portal.org This is the published version of a paper presented at 18th International Symposium on High Voltage Engineering (ISH), 213 Korea. Citation for the original published paper: Wang,
More informationAvailable online at ScienceDirect. Procedia Computer Science 83 (2016 )
Available online at www.sciencedirect.com ScienceDirect Procedia Computer Science 83 (2016 ) 766 773 The 6th International Conference on Sustainable Energy Information Technology (SEIT 2016) Analyzing
More informationINSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING
INSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING Course code : 5067(07-08) Course title : High voltage engineering Course structure Lectures Tutorials Practical credits
More informationTemperature and Field Dependence of Field Grading Tubes for Medium Voltage XLPE Cable Joints
24 th Nordic Insulation Symposium on Materials, Components and Diagnostics 138 Temperature and Field Dependence of Field Grading Tubes for Medium Voltage XLPE Cable Joints Frank Mauseth Norwegian Univ.
More informationHybrid Resistive-Capacitive and Ion Drift Model for Solid Gas Dielectrics
Hybrid Resistive-Capacitive and Ion Drift Model for Solid Gas Dielectrics N. Lavesson *1 and C. B. Doiron 2 1 ABB Corporate Research, Västerås, Sweden, 2 ABB Corporate Research, Dättwil, Switzerland *Corresponding
More informationDEPARTMENT OF ELECTRICAL ENGINEERING DIT UNIVERSITY HIGH VOLTAGE ENGINEERING
UNIT 1: BREAKDOWN IN SOLIDS 1.) Introduction: The solid dielectric materials are used in all kinds of electrical apparatus and devices to insulate current carrying part from another when they operate at
More informationSTUDIES ON LIGHTNING CHARACTERISTICS
STUDIES ON LIGHTNING CHARACTERISTICS Lohit Singh.G 1, Piyush Kankariya 1, Rakesh Kumar 1, Varun.P 1, Shreyas 1, Madhu Palati 2 1 UG Student, 2 Assistant Professor, 1, 2 Department of Electrical & Electronics
More informationFatima Michael College of Engineering & Technology
ANNA UNIVERSITY AFFILIATED COLLEGES BE EEE SEMESTER VI EE2353 - HIGH VOLTAGE ENGINEERING UNIT IOVER VOLTAGES IN ELECTRICAL POWER SYSTEMS 1. What is surge arrester? 2. Name the sources of switching surges.
More informationEXPERIMENTAL STUDY OF SHOCK WAVE INTERACTING PLANE GAS-PLASMA BOUNDARY
ISTP-16, 2005, PRAGUE 16 TH INTERNATIONAL SYMPOSIUM ON TRANSPORT PHENOMENA EXPERIMENTAL STUDY OF SHOCK WAVE INTERACTING PLANE GAS-PLASMA BOUNDARY Znamenskaya I.A., Koroteev D.А., Popov N.A. Moscow State
More informationI to assess the breakdown probability of the various insulation
IEEE Zkansactions on Electrical Insulation Vol. No., June 988 96 7 A Study of the Up-and-Down Method for non-normal Distribution Functions S. Vibholm and P. Thyregod Physics Laboratory, IMSOR, Technical
More informationThe Impulse Design of Transformer Oil-Cellulose Structures
IEEE Transactions on Dielectrics and Electrical Insulation Vol. 13, No. 3; June 2006 The Design of Transformer Oil-Cellulose Structures J.K. Nelson and C. Shaw Rensselaer Polytechnic Institute. Dept. of
More informationDIRECT STROKE LIGHTNING PROTECTION DESIGN
International Journal of Research in Engineering and Applied Sciences(IJREAS) Available online at http://euroasiapub.org/journals.php Vol. 7 Issue 1,January7, pp. 1~12cv ISSN (O): 2249-3905, ISSN(P) :
More informationwith embedded electrode
NAOSITE: Nagasaki University's Ac Title Author(s) Citation Estimation of surface breakdown vol with embedded electrode Yamashita, Takahiko; Iwanaga, Kazuh Hiroyuki; Fujishima, Tomoyuki; Asar IEEE Transactions
More informationInception Voltage of Corona Discharge from Suspended, Grounded and Stressed Particles in Uniform-Field Gas-Insulated-Gaps at Varying Pressures
Abdel-Salam et al. 1 Inception Voltage of Corona Discharge from Suspended, Grounded and Stressed Particles in Uniform-Field Gas-Insulated-Gaps at Varying Pressures M. Abdel-Salam 1, A. Ahmed, and A. Nasr
More informationInternational Journal of Advances in Engineering & Technology, May IJAET ISSN: D. Deepak Chowdary 1, J.Amarnath 2
ELECTRIC FIELD STRESS ANALYSIS FOR A COMPOSITE CONE TYPE SPACER DESIGNED FOR UNIFORM ELECTRIC FIELD DISTRIBUTION ON SPACER SURFACE IN THE PRESENCE OF A WIRE LIKE PARTICLE D. Deepak Chowdary 1, J.Amarnath
More informationOptical and Electrical Characterization of Creeping Discharges over Solid/Liquid Interfaces under Lightning Impulse Voltage
Optical and Electrical Characterization of Creeping Discharges over Solid/Liquid Interfaces under Lightning Impulse Voltage Lazhar Kebbabi, Abderrahmane Beroual To cite this version: Lazhar Kebbabi, Abderrahmane
More informationNECESSARY SEPARATION DISTANCES FOR LIGHTNING PROTECTION SYSTEMS - IEC REVISITED
X International Symposium on Lightning Protection 9 th -13 th November, 29 Curitiba, Brazil NECESSARY SEPARATION DISTANCES FOR LIGHTNING PROTECTION SYSTEMS - IEC 6235-3 REVISITED Fridolin H. Heidler 1,
More informationSurface corona discharge along an insulating flat plate in air applied to electrohydrodynamically airflow control : electrical properties
Surface corona discharge along an insulating flat plate in air applied to electrohydrodynamically airflow control : electrical properties E Moreau (1), G Artana (2), G Touchard (1) (1) Laboratoire d Etudes
More informationMultilayer Ultra High Gradient Insulator Technology
UCRL-JC-128812 PREPRINT Multilayer Ultra High Gradient Insulator Technology S. E. Sampayan I. A. Vitello M. L. Krogh J. M. Elizondo This paper was prepared for submittal to the International Symposium
More informationField Sensitive Air Terminal (F-SAT) Simply the Best Lightning Rod
Field Sensitive Air Terminal (F-SAT) Simply the Best Lightning Rod Introductory Technical Booklet Background (Physics of a Lightning Strike) It is well known that most lightning discharges are associated
More informationEE6701 HIGH VOLTAGE ENGINEERING UNIT II-DIELECTRIC BREAKDOWN PART A
EE6701 HIGH VOLTAGE ENGINEERING UNIT II-DIELECTRIC BREAKDOWN PART A 1. Mention the gases used as the insulating medium in electrical apparatus? Most of the electrical apparatus use air as the insulating
More informationHeriot-Watt University
Heriot-Watt University Heriot-Watt University Research Gateway Breakdown Process Experiments of Cap-and-Pin Insulators and their EMT Leader- Progression Model Implementation Koehler, Fabian; Swingler,
More informationEFFECT OF SURFACE CHARGING ON DC FLASHOVER CHARACTERISTICS OF POLYMERIC INSULATORS
EFFECT OF SURFACE CHARGING ON DC FLASHOVER CHARACTERISTICS OF POLYMERIC INSULATORS By IMTIAZ RIFANUL HOQUE SHAHID ALAM Diploma Work No. 73/211 Department of Materials and Manufacturing Technology CHALMERS
More informationThe Lightning Striking Probability for Offshore Wind Turbine Blade with Salt Fog contamination
The Lightning Striking Probability for Offshore Wind Turbine Blade with Salt Fog contamination Qingmin Li, 1,a) Yufei Ma, 1 Zixin Guo, 1 Hanwen Ren, 1 Guozheng Wang, 2 Waqas Arif, 1 Zhiyang Fang, 3 Wah
More informationProposed revisions to IEEE Standard 998 (1996) Guide for Direct Lightning Stroke Shielding of Substations
Rationale Proposed revisions to IEEE Standard 998 (1996) Guide for Direct Lightning Stroke Shielding of Substations Franco D Alessandro, PhD, MIEEE, WGD5 Participant Martin Havelka, MIEEE, WGD5 Member
More informationExperimental study on the dielectric breakdown voltage of the insulating oil mixed with magnetic nanoparticles
Available online at www.sciencedirect.com Physics Procedia 32 (2012 ) 327 334 18 th International Vacuum Congress, Beijing International Convention Center, August 2010 Experimental study on the dielectric
More informationC.V. Nguyen, A.P.J. van Deursen
MeV γ s from Long Leaders in STP Air C.V. Nguyen, A.P.J. van Deursen Group EPS, Technische Universiteit Eindhoven P.O. Box 513, 56 MB Eindhoven, The Netherlands Email: C.V.Nguyen@tue.nl, A.P.J.v.Deursen@tue.nl
More informationInvestigation and Analysis of Inception Voltage and Field Distribution in Power Cables with Internal Cavities in Dielectric
Investigation and Analysis of Inception Voltage and Field Distribution in Power Cables with Internal Cavities in Dielectric A. A. Hossam-Eldin Electrical Eng. Department, Faculty of Engineering, Alexandria
More informationELECTRICAL BREAKDOWN OF SHORT NON-UNIFORM AIR GAPS M. G. Hogg, I. V. Timoshkin, S. J. MacGregor, M. P. Wilson and M. J. Given, T.
Hogg, M. G. and Timoshkin, I. V. and Macgregor, S. J. and Wilson, M. P. and Given, M. J. and Wang, T. (013) Electrical breakdown of short nonuniform air gaps. In: Digest of Technical Papers-IEEE International
More informationUNIT I - INTRODUCTION SYLLABUS
SEM / YEAR: VII/IV QUESTION BANK SUBJECT : EE670 HIGH VOLTAGE ENGINEERING UNIT I - INTRODUCTION SYLLABUS Causes of over voltages and its effects on power system Lightning, switching surges and temporary
More informationUnderstanding Charge Dynamics in Elastomers Adopting Pulsed Electro Acoustic (PEA) Technique
Understanding Charge Dynamics in Elastomers Adopting Pulsed Electro Acoustic (PEA) Technique R. Sarathi, M. G. Danikas, Y. Chen, and T. Tanaka Abstract In the present work, Pulsed Electro Acoustic (PEA)
More informationINSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING
INSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING Course code : 067(07-08) Course title : High voltage engineering Course structure Lectures Tutorials Practical credits
More informationModeling of Partial Discharge Mechanisms in Solid Dielectric Material
Modeling of Partial Discharge Mechanisms in Solid Dielectric Material Y. Z. Arief, W. A. Izzati, Z. Adzis Abstract Partial discharge (PD) represents a physical phenomenon, in which discharges are involved
More informationA UNIFORM FIELD GAP PROTOTYPE
A UNIFORM FIELD GAP PROTOTYPE Nuraddin M. Giali, Milad A. Bashiri and Mohammed A. Abukhashan Electrical and Electronic Engineering Department, University of Tripoli, Libya National Authority for Scientific
More informationA Review of the Dynamic Modelling of Pollution Flashover on High Voltage Outdoor Insulators
Journal of Physics: Conference Series PAPER OPEN ACCESS A Review of the Dynamic Modelling of Pollution Flashover on High Voltage Outdoor Insulators To cite this article: Ali A. Salem and R. Abd-rahman
More informationExtremely far from equilibrium: the multiscale dynamics of streamer discharges
Extremely far from equilibrium: the multiscale dynamics of streamer discharges Ute Ebert 1,2 1 Centrum Wiskunde & Informatica Amsterdam 2 Eindhoven University of Technology http://www.cwi.nl/~ebert www.cwi.nl/~ebert
More informationThermal and temperature cycling tests on solid dielectric switches, interrupters, and reclosers
Thermal and temperature cycling tests on solid dielectric switches, interrupters, and reclosers Reclosers and Other Distribution Equipment Subcommittee Meeting September 21, 2004 Frank C. Lambert Members
More informationINTRODUCTION. The variation of the voltage distribution of an insulator string with ambient conditions has been studied
805 VOLTAGE DISTRIBUTION OF A STRING ILUSULATOR UNDER DC VOLTAGES K.N.Ravi, Dr. M. Ramammrty, Dr. M.S. Naidu Central Power Research Indian Institute of Institue, Bangalore Science, Bangalore INTRODUCTION
More informationINSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad
INSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad - 00 0 Department of Electrical and Electronics Engineering TUTORIAL QUESTION BANK Course Name : HIGH VOLTAGE ENGINEERING Course Code
More informationModeling of Degradation Mechanism at the Oil-Pressboard Interface due to Surface Discharge
Modeling of Degradation Mechanism at the Oil-Pressboard Interface due to Surface Discharge H. Zainuddin *1 and P. L. Lewin 2 1 Research Laboratory of High Voltage Engineering, Faculty of Electrical Engineering,
More informationIEEE TRANSACTIONS ON PLASMA SCIENCE 1
IEEE TRANSACTIONS ON PLASMA SCIENCE 1 Impulse-driven Surface Breakdown Data: A Weibull Statistical Analysis Mark P. Wilson, Member, IEEE, Martin J. Given, Senior Member, IEEE, Igor V. Timoshkin, Member,
More informationLightning Protection Of Wind Turbines
Lightning Protection Of Wind Turbines By Vidyadhar Peesapati Electrical Energy and Power Systems Group University Of Manchester 1.1 LIGHTNING PROTECTION OF WIND TURBINES What is lightning? Lightning is
More informationThermal and Electrical Breakdown Versus Reliability of Ta2O5 under Both Bipolar Biasing Conditions
Thermal and Electrical Breakdown Versus Reliability of Ta2O5 under Both Bipolar Biasing Conditions P. Vašina, T. Zedníček, Z. Sita AVX Czech Republic s.r.o., Dvorakova 328, 563 1 Lanskroun, Czech Republic
More informationNumerical Study on Influences of Barrier Arrangements on Dielectric Barrier Discharge Characteristics
504 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 31, NO. 4, AUGUST 2003 Numerical Study on Influences of Barrier Arrangements on Dielectric Barrier Discharge Characteristics Woo Seok Kang, Jin Myung Park,
More informationEHD flow produced by positive and negative point-to-plate corona discharges
Proc. 2018 Electrostatics Joint Conference 1 EHD flow produced by positive and negative point-to-plate corona discharges Eric Moreau, Patrick Braud, Etienne Defoort, Nicolas Benard University of Poitiers,
More informationComparative Analysis of Dielectric Properties of Enamel Filled with Various Nanofillers such as ZrO 2, Al 2 O 3, CNT and ZnO
Comparative Analysis of Dielectric Properties of Enamel Filled with Various Nanofillers such as,, and D. Edison Selvaraj Department of Electrical and Electronics Engineering, Mepco Schlenk Engineering
More informationA Novel Optimized Design for Busbar Structures using Finite Element Methods
A Novel Optimized Design for Busbar Structures using Finite Element Methods Xiaojuan Sun 1, Shuhong Wang, Ruilei Gong,3 1 School of Electronic Information Engeering,Xi an Technological University Xi an,71001,china
More informationEFFICIENCY OF DUAL WIRE-CYLINDER ELECTRODES USED IN ELECTROSTATIC SEPARATORS
EFFICIENCY OF DUAL WIRE-CYLINDER ELECTRODES USED IN ELECTROSTATIC SEPARATORS LAURENŢIU MARIUS DUMITRAN 1, LAURENŢIU VIOREL BADICU 1, MARIUS CRISTIAN PLOPEANU 1,2, LUCIAN DĂSCĂLESCU 2 Key words: Electrostatic
More informationPerformance analysis of 1200 kv ceramic disc insulator string under normal and faulted conditions
Available online at www.sciencedirect.com ScienceDirect Energy Procedia 75 (5 ) 4 9 The 7 th International Conference on Applied Energy ICAE5 Performance analysis of kv ceramic disc insulator string under
More informationPhysics 2220 Fall 2010 George Williams SECOND MIDTERM - REVIEW PROBLEMS
Physics 0 Fall 010 George Williams SECOND MIDTERM - REVIEW PROBLEMS The last four problems are from last years second midterm. Solutions are available on the class web site.. There are no solutions for,
More information