Pollution Maintenance Techniques in Coastal High Voltage Installations

K. Siderakis, D. Pylarinos, E. Thalassinakis, I. Vitellas, E. Pyrgioti

Abstract


Pollution of outdoor high voltage insulators is a common problem for utilities, with a considerable impact to power system reliability. In an effort to prevent possible flashovers due to pollution, many methods have been applied, aiming to improve the insulation performance, either by suppressing the formation of surface conductivity or by increasing the possible insulation level. In the case of substations, the selection of the appropriate technique is complex due to certain issues correlated to the nature of the installation. In this paper, several techniques usually implemented by utilities, are investigated based on the experienced gained in the case of Crete, a Greek island in southern Europe, where due to the coastal development of the power system, the majority of high voltage installations are exposed to intense marine pollution. The technique of coating insulators with Room Temperature Vulcanized Silicone Rubber (RTV SIR) has proved rather efficient and therefore is presented extendedly. Correlation of the material behaviour with environmental conditions is discussed and results from long term monitoring, including environmental parameters and leakage current measurements, in a 150 kV Substation are presented. It is shown that RTV SIR coatings have remarkably suppressed surface activity and that porcelain insulators exhibit different activity period when coated.


Keywords


pollution; RTV SIR; GIS; substation; insulator; leakage current;

Full Text:

PDF

References


R. E. Brown, T. M. Taylor, “Modeling the impact of substations on distribution reliability”, IEEE Transactions on Power Systems, Vol. 14, No. 1, 1999

CIGRE WG 33-04, TF 01, “A Review of current knowledge: Polluted Insulators”, Cigre Publications, 1998

IEEE Std 957-1987, IEEE Guide for Cleaning Insulators

J. S. T. Looms, “Insulators for high voltage”, IEE Power Engineering Series 7.

J. G. Wankowicz, S. M. Gubanski, W. D. Lampe, “Loss and recovery of hydrophobicity on RTV coating surfaces”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 1, No. 4, 1994

H. Hillborg, U. W. Gedde, “Hydrophobicity recovery of polydimethylsiloxane after exposure to corona discharges”, Polymer, Vol. 39, No. 10, 1998

J. Kim, M. K. Chaudhury, M. J. Owen, “Hydrophobicity loss and recovery of silicone HV insulation”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6, No. 5, 1999

S. H. Kim, E. A. Cherney, R. Hackam, “The loss and recovery of hydrophobicity of RTV silicone rubber insulator coatings”, IEEE Transactions on Power Delivery, Vol 5, No 3, 1990

D. P. Agoris, K. G. Siderakis, E. J. Thalassinakis, “Influence of the environment to the pollution performance of RTV Silicone Rubber coatings in Crete”, 13th ISH, Netherlands 2003

E. Thalassinakis, J. Stefanakis, K. Siderakis, D. Agoris, “Measures and Techniques against Pollution in the Cretan Transmission System”, European Power and Energy Systems, IASTED, Crete, GREECE, 2002

K. Siderakis, D. Agoris, J. Stefanakis, E. Thalassinakis, “Influence of the profile on the performance of porcelain insulators installed in coastal high voltage networks in the case of condensation wetting”, IEE Proceedings on Science, Measurements and Technology, Vol. 153, No. 4, 2006

E. Thalassinakis, K. Siderakis, D. Agoris, “Experience with new solutions to combat marine pollution in the power system of the Greek islands”, World Conf. on Insulators, Arresters and Bushings, Malaga, Spain, 2003

R. S. Gorur, E. A. Cherney, J. T. Burnham, Outdoor Insulators, R. S. Gorur Inc, Phoenix, Arizona, USA

IEEE Std 1523 – 2002, IEEE Guide for the application, maintenance and evaluation of RTV SIR Coatings for outdoor ceramic insulators, IEEE Outdoor Service Environment Committee, 2002

E. A. Cherney, R. S. Gorur, “RTV SIR Coatings for Outdoor Insulators”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol 6, No 5, 1999

E. A. Cherney, “RTV Silicone – A high tech solution for a dirty insulator problem”, IEEE Electrical insulation Magazine, Vol. 11, No. 6, 1995

K. Siderakis, D. Agoris, “Performance of RTV silicone rubber coatings installed in coastal systems”, Electric Power Systems Research, Vol. 78, No. 2, 2008

F. Pratomosiwi, Suwarno, “Performance Improvement of the Ceramic Outdoor Insulators Located at Highly Polluted Environment Using Room Temperature Vulcanized Silicone Rubber”, International Journal of Electrical Engineering and Informatics, Vol. 2, No. 1, 2010

D. Pylarinos, K. Siderakis, E. Pyrgioti, E. Thalassinakis, I. Vitellas, “Impact of Noise Related Waveforms on Long Term Field Leakage Current Measurements”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 18, No. 1, 2011




eISSN: 1792-8036     pISSN: 2241-4487