Comparative Investigation of Pollution Accumulation and Natural Cleaning for Different HV Insulators

M. Dimitropoulou, D. Pylarinos, K. Siderakis, E. Thalassinakis, M. Danikas

Abstract


High Voltage insulators are scattered throughout any HV network and a single insulator fault may cause an excessive outage. Reliability is a key issue for electric power systems and fault-free performance of insulators greatly reflects on the reliability of the system. Environmental influence is rather important for the optimum selection of outdoor insulators and, therefore, field measurements provide valuable information. Utilities perform such measurements in order to decide upon the location/route of new HV installations (substations, lines etc) and also to optimize the selection, maintenance and replacement of already installed insulators. A rather interesting case in Greek territory is the island of Crete, due to the coastal development of the network and the local weather conditions. The Greek utility has employed a variety of remedies to cope with the pollution problem. Following the positive feedback after the installation on certain tower in the past, a large project to replace all ceramic insulators with new polymer ones of hydrophobic surface is now in progress. Polymer coatings have also been extensively applied on substations and also on certain areas/towers of the transmission network in the past. In order to investigate the pollution accumulation and the impact of natural washing on different insulator types, a series of periodical ESDD and NSDD pollution measurements were conducted in HEDNO’s TALOS High Voltage Test Station for a 3-months period. Multiple measurements were performed on each insulator every month in order to collect additional data. Five different insulators were selected based on the types historically used in the Cretan Network. Along with the standard glass disc profile, two strings of glass fog profile (the one coated with RTV) and two long-rod composite insulators of different shed profile and material were used. Results are presented and discussed in this paper.


Keywords


Outdoor insulators; pollution; field measurements; ESDD; NSDD

Full Text:

PDF

References


CIGRE WG 33-04, TF 01, A review of current knowledge: polluted insulators, CIGRE, 2000

CIGRE WG C4.303, Outdoor insulation in polluted conditions: Guidelines for selection and dimensioning, CIGRE, 2008

IEC/TS 60815, Selection and dimensioning of high-voltage insulators intended for use in polluted conditions, International Electrotechnical Commission, 2008

K. Siderakis, D. Pylarinos, E. Thalassinakis, E. Pyrgioti, I. Vitellas, “Pollution maintenance techniques in coastal high voltage installations”, Engineering, Technology & Applied Science Research, Vol. 1, No. 1, pp. 1-7, 2011

D. Pylarinos, K. Siderakis, E. Pyrgioti, “Measuring and analyzing leakage current for outdoor insulators and specimens”, Rev. Adv. Mater. Sci., Vol. 29, Page 31, 2011

D. Pylarinos, K. Theofilatos, K. Siderakis, E. Thalassinakis, I. Vitellas, A. T. Alexandridis, E. Pyrgioti, “Investigation and classification of field leakage current waveforms”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 19, No. 6, pp. 2111-2118, 2012

K. O. Papailiou, F. Schmuck, Silicone composite insulators: materials, designs, applications, Springer, 2013

K. Siderakis, D. Pylarinos, “Room temperature vulcanized silicone rubber coatings, application in high voltage substations", in: “Concise Encyclopedia of High Performance Silicones”, John Wiley & Sons Inc, 2014

J. Stefanakis, E. Thalassinakis, K. Siderakis, D. Agoris, E. Dialynas, “Fighting pollution in the cretan transmission system. 25 years experience”, presented at the Contamination Issues on High Voltage Installations conference, Iraklion, Crete 2001 (available at: http://talos-ts.com/files/2001_CIHVI.pdf)

D. Pylarinos, K. Siderakis, E. Koudoumas, E. Thalassinakis, "Polymer insulators and coatings in the cretan power system. the transmission line case", 9th Mediterranean Conference on Power Generation, Transmission Distribution and Energy Conversion, Athens, Greece, 2-5 November, 2014

S. Gubanski, "Greek power company evaluates alternatives to combat pollution in transmission system on Crete", INMR Vol. 10, No. 4, 2002

D. Pylarinos, K. Siderakis, E. Thalassinakis, "Comparative investigation of silicone rubber composite and RTV coated glass insulators installed in coastal overhead transmission lines", IEEE Electrical Insulation Magazine, Vol. 31, No. 2, pp. 23-29, 2015

TALOS High Voltage Test Station, www.talos-ts.com

R. Znaidi, “Expanded test station helps Greek power system operator assess insulator design & performance”, INMR, Issue 107, Q1, pp. 54-67, 2015

D. Pylarinos, K. Siderakis, E. Thalassinakis, “R&D in TALOS high voltage test station-assessing aging and performance of polymer insulators”, 13th International Conference on Circuits, Systems, Electronics, Control & Signal Processing (CSECS '14), Lisbon, Portugal, October 30-November 1, 2014

D. Pylarinos, K. Siderakis, I. Pellas, E. Thalassinakis, “Assessing pollution of outdoor insulators in the cretan power system”, 18th International Conference on Circuits, Systems, Communications and Computers (CSCC 2014), Santorini, Greece, July 17-21, 2014

P. W. Haberecht, Pollution deposition rates on insulator (HV) surfaces for use in atmospheric corrosivity estimation, The University of Newcastle, 2008




eISSN: 1792-8036     pISSN: 2241-4487