摘要
Porcelain cap and pin insulators are by far the most popular suspension insulators in high voltage(HV) distribution networks all around the world.Inspection and condition monitoring of HV insulators is also very important to the utility companies because of the critical and vital role that they play in distribution systems.In terms of safety, practicality and ease of use,remote detection methods are more popular among the line technicians.A new remote condition assessment method based on electromagnetic radiations from porcelain insulators is presented in this paper. In a lab environment,a string of two porcelain insulators is energized by a 45 kV transformer.Electromagnetic radiations due to the partial discharge activities inside the porcelain insulator are captured by passive sensors and antennas. Two cases of defective insulators on a two insulator string are studied here.The first case focuses on the effect of contaminated porcelain shells on radiation signature of partial discharges.A polluted porcelain shell with ESDD level of 0.03 mg/cm^2 was first tested.The second case studies the effect of cracks of an intentionally-cracked porcelain shell. The cracked insulator is also tested on a two insulator string.To compare the partial discharge radiation signature of different faulty insulators,phase resolved graphs were developed.The electromagnetic radiated signature of a polluted insulator and a cracked insulator was calculated and compared using phase resolved graphs.
Porcelain cap and pin insulators are by far the most popular suspension insulators in high voltage （HV） dis- tribution networks all around the world. Inspection and condition monitoring of HV insulators is also very important to the utility companies because of the critical and vital role that they play in distribution systems. In terms of safety, practicality and ease of use, remote detection methods are more popular among the line technicians. A new remote condition assessment method based on electromagnetic radiations from porcelain insulators is presented in this gaper. In a lab environment, a string of two porcelain insulators is energized by a 45 kV transformer. Electromagnetic radia- tions due tO the partial＂discharge activities inside the porcelain insulator are captured by passive sensors and antennas. Two cases of defective insulators on a two insulator string are studied here. The first case focuses on the effect of con- taminated porcelain shells on radiation signature of partial discharges. A polluted porcelain shell with ESDD level of 0.03 mg/cmz was first tested. The second case studies the effect of cracks of an intentionally-cracked porcelain shell. The cracked insulator is also tested on a two insulator string. To compare the partial discharge radiation signature of different faulty insulators, phase resolved graphs were developed. The electromagnetic radiated signature of a polluted insulator and a cracked insulator was＇calculated and compared using phase resolved graphs.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第11期2649-2654,共6页
High Voltage Engineering
作者简介
Ehsan Azordegan received the B. Sc. and M. Sc degrees in electrical engineering from the University of Tehran, Tehran, Iran, in 2003 and 2006, respectively. He is currently work ing toward the Ph.D. degree in electrical engineering at the University of Manitoba, Win nipeg, MB, Canada. His research interests include High Voltage engineering, condition assessment of defective insulators and studying contamination effects on HV insulators
David R. Swatek （M＇85） received the B. Sc. and Ph.D. degrees in electrical engineering from the University of Manitoba, Winnipeg, MB, Canada, in 1988 and 1999, respectively. He joined Manitoba Hydro in 1988 where he is currently manager of the Insulation Engineer- ing and Testing Department. Dr. Swatek received the URSI Commission B： Fields and Waves, Young Scientist Award, St. Peters burg, Russia, in 1995; and the 1999 - 2000 University of Manitoba Distinguished Doctoral Dissertation Award in the Field of Natural Sciences and Engineering. His research in- terests include high voltage, electromagnetic propagation, power system transients and reliability. He is a member of the IEEE Pow er Engineering, Dielectric and Electrical Insulation, and Engineer ing Management Societies. David Swatek is a registered pro{ession- al engineer in the province of Manitoba
Behzad Kordi received the B. Se. （with distinction）, M. Sc. , and Ph.D. degrees all in electrical engineering from Amirkabir Universi- ty of Technology （Tehran Polytechnic）, Tehran, Iran, in 1992, 1995, and 2000, respectively. During 1998 and 1999, he was with the Lightning Studies Group at the University of Toronto, Canada. In 2002, he joined the Electrical and Computer Engineering Departmerit of the University of Manitoba as a Post Doctoral Fellow. He has been an assistant professor at this Department since 2005. His research interests include condition monitoring of high voltage aparatus, electromagnetic sensors, transmission lines, and electromag netic compatibility （EMC） in power systems. Dr. Kordi is the author/coauthor of more than 50 scientific papers published in reviewed journals or presented at international conferences
