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Asian Experience with RTV Silicone Coatings
for Insulators
Asian Experience with RTV Silicone Coatings
for Insulators
Case Histories
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
AbstractReview RTV silicone coating experiences for high voltage
porcelain insulators in Asian countries such as Korea, China, Taiwan, Thailand and India.
Focus on case histories of field application of RTV Silicone Coatings in these countries.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
The Flashover Process
Accumulation of Contaminants(Salt particles from coastal environment/ industrial pollution)
+Water Filming
(light rain, dew, heavy fog)
Leakage Currents
Dry-band Arcing & Flashover
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Cost of FlashoversLoss of revenueDisruption of businessDisruption of serviceInconvenience to consumersPoor service provider image
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Flashover Protection MethodsCleaning
Manual wiping or energized washing with high pressure systems. Repetitive short-term solution. Cleaning must be repeated at a rate that will stay ahead of the contamination in order to be effective
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Flashover Protection MethodsDesign
Extended creepage distance insulators/ Units designed for a high voltage class.When pollution problem is known before equipment is specified. More often pollution levels are not known or pollution comes after the construction of the utility system.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Flashover Protection MethodsSurface Modification
Modify the surface properties of the insulator with the use of silicone greases and coatings. Silicones imparts hydrophobicity to the insulator surface that prevents a conductive film to be formed, thereby limiting and managing surface leakage currents. Additives used in the formulation suppress arc and control surface temperatures.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
RTV Silicone CoatingDeveloped by Dow Corning between 1970-74 as a response
to industry’s need for a maintenance free solution.
Extensively tested at various utilities across the United States between 1974-84.
Commercially available since 1984 as Sylgard® HVIC.
Global Applications across United States, Europe, Middle East and Asia in voltage ranging from 11kV to 500 kV DC.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
How RTV Silicone Coating Works ?Imparts hydrophobicity and prevents wetting of contaminants
and formation of an ionisable solution that can lead to increased leakage, dry band arcing and eventual flashovers.
Low molecular weight silicone molecules encapsulate contaminants and neutralize them.
In extreme weather events, arc resistance fillers, ATH releases H2O and resists degradative effects of high temperatures.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Review Of Silicone RTV Coating Installations
Across Asia
Review Of Silicone RTV Coating Installations
Across Asia
Few Case Studies
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Customer:State Power Utility
Location:South India
Pollution:Salt particles from cooling tower of a thermal power plant. Veryfrequent flashovers
Solution:Sylgard® HVIC applied in 2004 on all equipments in one bay at the 400 kvSS
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
All equipments in one bay of the 400 kVSS, incl. CTs, CBs, Pilots, Suspension, Pantograph Isolators, Supports, etc coated with Sylgard HVIC
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at 400 kvSS in India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC Applied to Transformer Bushings at Taiwan Power Company
Customer:Taiwan Power Company Din - Hu Substation
Location:LinCo, Taipei County, North West Region of Taiwan
Pollution:Saline, smog, industrial and chemical pollution
Solution:Sylgard® HVIC applied in 1993 continues to perform until 1999
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC Applied to Transformer Bushings atTaiwan Power Company
Substation started operation in 1988Situated near the coast exposed to saline environments as well as industrial and chemical pollutants.Weekly washing in the first few years of operation.Applied Silicone Grease in 1992.
Substation wanted a long-term maintenance free solution.Sylgard HVIC applied on 345 kV transformer bushings in 1993.Washed them in 1996 during third year inspection.Continued to perform until 1998. Recoated with Sylgard HVIC 0.25mm thick in 1999.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at Hsinchu Industrial Park 68 kV Substation
Customer:Taiwanese Power Utility – Hsinchu Industrial Park Substation
Location:Hsinchu Industrial Park, Taiwan
Pollution:Dust, salt deposits and chemical pollution
Solution:Sylgard® HVIC applied in 1993 continues to perform.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Sylgard HVIC at Hsinchu Industrial Park 68 kV Substation
Substation located 10 km from ocean.Serves Industrial customers including large manufacturing plants. Used Silicone Compound but found shutdown for repetitive application difficult.Started energized washing weekly but experienced flashovers during and between washing.
Entire substation coated including support and suspension insulators, bushings, etc with Sylgard HVIC in 1993.Sylgard HVIC sprayed over a week in two stages – 8 hours each.No flashovers since 1993. SylgardHVIC continues to perform.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Shanghai Extra High Voltage Power Transmission Company
500kV Nanqiao HVDC Converter station, wall bushings coated with Sylgard HVIC.
This line links central and eastern network (Yangtze to Shanghai).
HVDC creates special problem. Contaminated particles get polarized and attract to the insulators.
Converter stations are located at each end of the line. Light industrial and river pollution necessitated continual hand cleaning of the HV DC insulators until the application of Sylgard® HVIC coating in 1991
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Bhutan Power Station 220/132 kVSSCustomer:Pashaka Substation 220/132 kVSS
Location:Bhutan
Pollution:Slurry from land slides, carbide dust from carbide plant, cement dust from cement plant
Problem:Frequent tripping and repeated shutdowns to clean 220 kv support insulators and isolator switches.
Solution:Sylgard® HVIC applied in 2000
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Cement Plant, North India 132/33 kVSS
Customer:Gujarat Ambuja Cement 132/33 kV SS
Location:North India
Pollution:Captive Dust; Fly Ash from adjacent thermal plant
Problem:Frequent tripping and shutdowns to clean insulators
Solution:Sylgard® HVIC applied in 2004
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Gujarat, West India, Petrochemicals Complex 220kv SS
Customer:Reliance Petrochemicals
Location:Gujarat, West India
Pollution:Iron Ore Dust from a neighboring steel plant, captive dust and saline environment
Problem:Shutdowns to regularly clean insulators was difficult; CT Failure
Solution:Sylgard® HVIC applied in 2000 on CTs and other critical equipment
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
What kind of approach would you use ?
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
What kind of approach would you use ?
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
What kind of approach would you use ?
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
What kind of approach would you use ?
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Trend Towards RTV Coating in Power Utilities Utilities gradually moving from water washing and greasing
to one time application of Silicone RTV Coating for installed equipments.
Silicone RTV coating has proven as a very cost-effective protection method.
Internal study of 132 kv SSs in a state utility in India –(i) The cumulative revenue losses from outages over a period 3 years is almost equal to the investment in Sylgard HVIC coating. (ii) It also works to approx. 1% of annual revenue of the sub-station. With better reliability vis-à-vis other methods.
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Salt161 kVShen-au Power Plant1994
Salt345 kVTaichung Power Plant1993
Salt345 kVLin-Co Substation1993
Salt69 kVHseih-ho Power Plant1993
Salt, Industrial69 kVChung-Mei-Ho Power Plant (petrochemical)1992
Salt345 kVTaichung Transmission Lines1991
Salt69 kVFang-San Substation1991
Salt69 kVFang-Liau Substation1991
Salt, industrial69 kVTaiwan Glass1991
Industrial, dust69 kVTaiwan Styrene-Petrochemical Plant1991
Industrial, dust69 kVSang-Yang Motor Company1991
Salt, Industrial161 kVSang-Min Power Plant1990
Salt, Industrial161 kVTa-Lin Power Plant1990
Salt 69 kVMai-Laio Transmission line1990
Salt, dust69 kVHsin- Tao Substation1990
Salt, dust161 kVNan-Pu Power Plant1989
Industrial pollution500 kV DCGe Zhou Ba Power Plant1989
ContaminantVoltageCustomerYear
RTV Silicone Coating in Taiwan and China
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Salt, industrial230 kVEgat CC&CC Block 1 & 21996
Salt, industrial115 kVEgat Substation1996
Salt, industrial115 kVEgat Substation1996
Salt, industrial115 kVEgat Substation1996
Salt, industrial115 kVEgat Substation1996
Lignite, Chemical115 kVThai Caprolactam Public Co Ltd1996
Industrial pollution22 kVKR Precision Public Co Ltd1996
Salt, industrial230 kVEgat ( Switchyard Bay 7 - 10 )1995
Industrial pollution22 kVSiam Tire cord Co Ltd1995
Industrial pollution22 kVMagtric Co Ltd1995
Salt, industrial230 kVEgat ( Switchyard Bay 11 - 12 )1995
Salt, industrial230 kVEgat ( Switchyard Bay 1 - 6 )1995
Salt, industrial230 kVPhadaeng Industry Public Co1995
Pollution115 kvNakornluang Cement1994
Industrial pollution22 kVCharernsawat CoLtd1994
Industrial pollution22 kVNagyang Factory Co Ltd1994
Phosphate/others69 kVThai Central Chemical1994
Sodium hydroxide/others69 kVThai Asahe1994
Pollution69 kVMEA Transmission Line1993
Industrial pollution11 kVTPI Petrochemical Public co. Ltd1993
ContaminantVoltageCustomerYear
RTV Silicone Coating in Thailand
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Salt345 kVDongseo Power plant (Dangjin petro)2005
Salt345 kVWolsung Nuclear Power Plant2004
Salt345 kVGori Nuclear Power Plant2004
Salt345 kVKEPCO (Suwon Power Station)2004
Salt345 kVUljin Nuclear Power Plant2003
Salt, Industrial154 kVSeobu Power Plant (Pyungtaeck)2003
Salt154 kVNambu Power Plant (Youngnam petro)2003
Salt345 kVKEPCO (Sin-Goyang)2003
Salt345 kVKEPCO (Sin-Ulsan)2003
Salt, industrial154 kVKumho Power Plant2002
Salt, dust345 kVYoungkwang Nuclear Plant2002
Dust345 kVNambu Power Plant (Hadong petro)2002
Salt, Industrial345 kVKEPCP (Jinju Power Station)2001
Industrial154 kVKERI2001
Salt, dust154 kVHyundai Mipo (Ship building Co.)2000
Salt, dust345 kVDongseo Power plant (Ulsan petro)1998
Salt, dust345 kVNamdong Power plant (Samcheonpo)1997
Industrial154 kV KEPCO (Suncheon Power Station)1995
ContaminantVoltageCustomerYear
RTV Silicone Coating in Korea
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
To ConcludeAfter its commercial introduction in 1984, hundreds of
installations have been successfully coated in Asia and worldwide with Sylgard® HVIC, the brand from Dow Corning.
In particular, Asian installations now have a proven alternative to mitigating contamination related flashovers.
Sylgard® HVIC has successfully avoided flashovers in most kinds of pollution and weather environments.
Sylgard® HVIC is a cost-effective method to prevent contamination induced flashovers..
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Special ThanksMr. Venkatraman Sundaramoorthy, Sales Manager, EEI,
Dow Corning India (P) Limited, India
Mr. Nitin Kamat, Industry Sales Manager, HVIC, Dow Corning India (P) Limited, India
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
Thank you
Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:satish@projectsalescorp.com
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