{"title":"Behaviour of outdoor vacuum circuit breakers under simulated environments","authors":"V. Vaidhyanathan, T. Bhavanishanker","doi":"10.1109/CATCON.2017.8280242","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280242","url":null,"abstract":"Outdoor vacuum circuit breaker are the most commonly used switchgear in the Medium High Voltage(MHV) segment particularly in the 11 kV and 33 kV distribution grids. As these breakers are used in outdoor switchyards they are exposed to varied weather conditions. A study was undertaken to ascertain the performance of outdoor Vacuum Circuit Breaker (VCB) under simulated low and high ambient conditions which are presented in this paper. The results of this study have been analyzed to understand the performance of the MHV Outdoor VCBs under various low and high ambient conditions. Important conclusions derived from the study have been discussed in the paper.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123089636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cavity discharge behaviors under trapezoid-based voltage at very low frequency","authors":"H.V.P. Nguyen, B. Phung","doi":"10.1109/CATCON.2017.8280204","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280204","url":null,"abstract":"As Very Low Frequency (VLF) diagnostic testing is becoming more widely used in assessing electrical insulation degradation, it is important to investigate partial discharge behaviors in insulation defects under VLF excitation. This paper is an experimental study of discharges in an air-filled void bounded by solid dielectric under different trapezoidal-shape voltage waveforms at 0.1 Hz. Measurement results show that discharge characteristics are strongly dependent on the rate of change of voltage rather than the applied frequency. The rise time of voltage also affects the inception of discharges in the cavity as it influences the local electric field causing discharges. Comparing between VLF and 50 Hz, the accumulated charge decay rate in the cavity surface contributes to differences in discharge magnitudes.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115363194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Influence of PWM technique on breakdown in twisted pairs","authors":"S. N. Rao, K. Elanseralathan","doi":"10.1109/CATCON.2017.8280258","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280258","url":null,"abstract":"Premature insulation failure is frequently observed in the stator winding of electrical motors fed by inverter drives in industrial applications for obtaining adjustable speeds. The Power Electronic Converters using PWM technique produces pulsed waveforms having a very short rise and fall times due to the high switching frequency of IGBT's. The life of such motor winding insulation is tested using twisted pair samples prepared using enameled wires. The enamel coating of Modified Polyester (non-corona resistant material) of 40 microns thickness is used for this work. The breakdown tests were performed by applying a high frequency high voltage stress of PWM and PWM-peak waveforms with different frequency levels up to 30 kHz. The test results show that the insulation fails much earlier for PWM-peak waveform than the PWM waveform.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124200600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electric field enhancement in LDPE/MgO nanocomposite materials","authors":"A. K. Upadhyay, C. Reddy","doi":"10.1109/CATCON.2017.8280257","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280257","url":null,"abstract":"Space charge phenomenon in Low Density Polyethylene (LDPE) is being investigated for more than two decades. Several theories have been put forth by researchers. Several experiments have been done and analysed on space charge dynamics in general, yet, the understanding on mechanism of space charge dynamics, field variations, charge packet movement inside the material etc. is incomplete. In this paper investigation has been done to observe the space charge dynamics of LDPE/MgO, with different concentrations of MgO, using Pulsed electroacoustic technique. Field enhancement due to charge accumulation and distortion has been investigated for a duration as long as five hours.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129837296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multistress aging studies on HTV silicone rubber insulators","authors":"A. Verma, B. S. Reddy","doi":"10.1109/CATCON.2017.8280202","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280202","url":null,"abstract":"Polymeric insulators are used for overhead transmission line insulation due to various advantages, but long term performance and estimation of service life is still a challenge. During service life, these insulators are stressed under different mechanical, electrical, environmental stresses etc. and over a period, they lose their insulation properties. In the present work, an attempt is made to study the effect of multiple stresses like thermal, ultra violet (UV) radiation, humidity along with electrical stress on the long term performance. These stresses are applied in a specific cyclic manner to closely meet the real climatic service conditions. During experimentation leakage current is monitored regularly. Physicochemical analysis is performed using Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Analysis (EDAX) to find elemental composition changes during experiment and Thermo-Gravimetric Analysis (TGA) is used to analyze the thermal stability. Fourier transform infrared (FTIR) spectroscopy is performed to detect chemical changes and surface hydroxylation in aged insulating samples. Further, the effect of multiple stresses on tensile strength is observed and reported.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125912983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental and simulation studies on room temperature vulcanization (RTV) silicone material under inclined plane tracking and erosion test","authors":"A. Gomez, A. B. R. Mathersa, N. Vasudev","doi":"10.1109/CATCON.2017.8280233","DOIUrl":"https://doi.org/10.1109/CATCON.2017.8280233","url":null,"abstract":"In an electric power system, one of the most vital equipment is the insulator. In early times, porcelain insulators are commonly used in transmission as well as in distribution network. The proposal of this work is to make sure that safer and more protected distribution system, to decrease maintenance expenses of the insulation system and to enhance system efficiency. The aim of this paper was to study and assess the performance of RTV (Room temperature vulcanization) silicone materials used to reduce flashover in high voltage insulators that run in polluted environments. Electrical tracking is a development process of a conducting path across the material due to erosion under High Voltage application. The leakage current on the polluted surface resulted in the material deterioration. Electric field and voltage distribution for RTV silicone material under contamination condition have been done using finite element analysis. The simulation works using Finite Element software of ElecNet was applied to the tracking test condition of IEC 60587 standards. The results show that the electric field strength is high on the edges of pollutant track at a higher voltage level, and pollutant track has no effect on the voltage distribution along the surface. Experiments have been conducted for the RTV silicone material for the different voltage and contaminant flow as per the standards. From the results, it was observed that increase in voltage potential eventually increases the electric field distribution. The leakage current was measured across the shunt using the Pico scope. A protective circuit was made across the shunt. The leakage current pattern has been studied on the different applied voltage for the RTV silicone material. Room Temperature Vulcanization silicone material shows an evidence of good insulation to tracking and erosion test.","PeriodicalId":250717,"journal":{"name":"2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129334599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}