Asian Experience With Rtv Silicone Coatings
1 like738 views
The document discusses case studies of using RTV silicone coatings like Sylgard HVIC on high voltage insulators in Asia. It describes projects in India, Taiwan, and China where Sylgard HVIC was applied to substations and transmission lines experiencing flashovers from pollution. In all cases, applying the RTV silicone coating eliminated flashovers for many years with no need for reapplication or cleaning during that time.
Asian Experience With Rtv Silicone Coatings
- 1. Asian Experience with RTV Silicone Coatings for Insulators Case Histories Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 2. Abstract Review 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:[email protected]
- 3. 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:[email protected]
- 4. Cost of Flashovers Loss of revenue Disruption of business Disruption of service Inconvenience to consumers Poor service provider image Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 5. Flashover Protection Methods Cleaning 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:[email protected]
- 6. Flashover Protection Methods Design 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:[email protected]
- 7. Flashover Protection Methods Surface 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:[email protected]
- 8. RTV Silicone Coating Developed 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:[email protected]
- 9. 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:[email protected]
- 10. Review Of Silicone RTV Coating Installations Across Asia Few Case Studies Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 11. 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. Very frequent 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:[email protected]
- 12. 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:[email protected]
- 13. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 14. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 15. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 16. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 17. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 18. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 19. Sylgard HVIC at 400 kvSS in India Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 20. 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:[email protected]
- 21. Sylgard HVIC Applied to Transformer Bushings at Taiwan Power Company Substation started operation in Substation wanted a long-term 1988 maintenance free solution. Situated near the coast exposed Sylgard HVIC applied on 345 kV to saline environments as well as transformer bushings in 1993. industrial and chemical Washed them in 1996 during third pollutants. year inspection. Weekly washing in the first few Continued to perform until 1998. years of operation. Recoated with Sylgard HVIC Applied Silicone Grease in 1992. 0.25mm thick in 1999. Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 22. 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:[email protected]
- 23. Sylgard HVIC at Hsinchu Industrial Park 68 kV Substation Substation located 10 km from Entire substation coated including ocean. support and suspension Serves Industrial customers insulators, bushings, etc with including large manufacturing Sylgard HVIC in 1993. plants. Sylgard HVIC sprayed over a Used Silicone Compound but week in two stages – 8 hours found shutdown for repetitive each. application difficult. No flashovers since 1993. Sylgard Started energized washing HVIC continues to perform. weekly but experienced flashovers during and between washing. Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 24. 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:[email protected]
- 25. Bhutan Power Station 220/132 kVSS Customer: 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:[email protected]
- 26. 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:[email protected]
- 27. 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:[email protected]
- 28. What kind of approach would you use ? Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 29. What kind of approach would you use ? Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 30. What kind of approach would you use ? Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 31. What kind of approach would you use ? Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 32. 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:[email protected]
- 33. RTV Silicone Coating in Taiwan and China Year Customer Voltage Contaminant 1989 Ge Zhou Ba Power Plant 500 kV DC Industrial pollution 1989 Nan-Pu Power Plant 161 kV Salt, dust 1990 Hsin- Tao Substation 69 kV Salt, dust 1990 Mai-Laio Transmission line 69 kV Salt 1990 Ta-Lin Power Plant 161 kV Salt, Industrial 1990 Sang-Min Power Plant 161 kV Salt, Industrial 1991 Sang-Yang Motor Company 69 kV Industrial, dust 1991 Taiwan Styrene-Petrochemical Plant 69 kV Industrial, dust 1991 Taiwan Glass 69 kV Salt, industrial 1991 Fang-Liau Substation 69 kV Salt 1991 Fang-San Substation 69 kV Salt 1991 Taichung Transmission Lines 345 kV Salt 1992 Chung-Mei-Ho Power Plant (petrochemical) 69 kV Salt, Industrial 1993 Hseih-ho Power Plant 69 kV Salt 1993 Lin-Co Substation 345 kV Salt 1993 Taichung Power Plant 345 kV Salt 1994 Shen-au Power Plant 161 kV Salt Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 34. RTV Silicone Coating in Thailand Year Customer Voltage Contaminant 1993 TPI Petrochemical Public co. Ltd 11 kV Industrial pollution 1993 MEA Transmission Line 69 kV Pollution 1994 Thai Asahe 69 kV Sodium hydroxide/others 1994 Thai Central Chemical 69 kV Phosphate/others 1994 Nagyang Factory Co Ltd 22 kV Industrial pollution 1994 Charernsawat CoLtd 22 kV Industrial pollution 1994 Nakornluang Cement 115 kv Pollution 1995 Phadaeng Industry Public Co 230 kV Salt, industrial 1995 Egat ( Switchyard Bay 1 - 6 ) 230 kV Salt, industrial 1995 Egat ( Switchyard Bay 11 - 12 ) 230 kV Salt, industrial 1995 Magtric Co Ltd 22 kV Industrial pollution 1995 Siam Tire cord Co Ltd 22 kV Industrial pollution 1995 Egat ( Switchyard Bay 7 - 10 ) 230 kV Salt, industrial 1996 KR Precision Public Co Ltd 22 kV Industrial pollution 1996 Thai Caprolactam Public Co Ltd 115 kV Lignite, Chemical 1996 Egat Substation 115 kV Salt, industrial 1996 Egat Substation 115 kV Salt, industrial 1996 Egat Substation 115 kV Salt, industrial 1996 Egat Substation 115 kV Salt, industrial 1996 Egat CC&CC Block 1 & 2 230 kV Salt, industrial Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 35. RTV Silicone Coating in Korea Year Customer Voltage Contaminant 1995 KEPCO (Suncheon Power Station) 154 kV Industrial 1997 Namdong Power plant (Samcheonpo) 345 kV Salt, dust 1998 Dongseo Power plant (Ulsan petro) 345 kV Salt, dust 2000 Hyundai Mipo (Ship building Co.) 154 kV Salt, dust 2001 KERI 154 kV Industrial 2001 KEPCP (Jinju Power Station) 345 kV Salt, Industrial 2002 Nambu Power Plant (Hadong petro) 345 kV Dust 2002 Youngkwang Nuclear Plant 345 kV Salt, dust 2002 Kumho Power Plant 154 kV Salt, industrial 2003 KEPCO (Sin-Ulsan) 345 kV Salt 2003 KEPCO (Sin-Goyang) 345 kV Salt 2003 Nambu Power Plant (Youngnam petro) 154 kV Salt 2003 Seobu Power Plant (Pyungtaeck) 154 kV Salt, Industrial 2003 Uljin Nuclear Power Plant 345 kV Salt 2004 KEPCO (Suwon Power Station) 345 kV Salt 2004 Gori Nuclear Power Plant 345 kV Salt 2004 Wolsung Nuclear Power Plant 345 kV Salt 2005 Dongseo Power plant (Dangjin petro) 345 kV Salt Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]
- 36. To Conclude After 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:[email protected]
- 37. Special Thanks Mr. 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:[email protected]
- 38. Thank you Paper Presented at INMR Hongkong 2005 by Project Sales Corp. mailto:[email protected]