Sylgard Hvic Image Brochure.Pdf
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Sylgard Hvic Image Brochure.Pdf Sylgard Hvic Image Brochure.Pdf Document Transcript

  • SYLGARD® High Voltage Insulator Coating Proven protection against pollution The same formulation for more than 25 years To deliver products and services which safely solve today’s problems and prevent tomorrow’s
  • SYLGARD High Voltage Insulator Coating The reliable, cost-effective, long term solution to pollution induced flashovers of high voltage insulators. Insulator contamination has been a problem since the birth of SYLGARD HVIC, high reliability, electrical power distribution. Salt spray, industrial pollutants, low lifetime running costs and even desert sand can lead to costly power interruptions due To deliver the performance required by demanding maintenance to arcing and flashover. While numerous attempts with other engineers, SYLGARD HVIC was formulated and put to the test protective methods have had their limitations, there is a solution globally by several major electrical utilities and many high voltage that utility maintenance engineers can rely on: SYLGARD High laboratories. It was found to resist corona, ultraviolet light, water Voltage Insulator Coating (HVIC). erosion and the accumulation of airborne particle contamination. Researched and developed by Dow Corning Corporation in the During the last 25 years SYLGARD HVIC has demonstrated its early1970’s in response to utility engineers requirements for superiority in providing long term, virtually maintenance free, longterm protection against pollution, the SYLGARD HVIC flashover protection of high voltage insulators in polluted formulation has remained unchanged for more than 25 years. environments. A long history of successful performance in highly contaminated areas has proven that SYLGARD HVIC provides superior arcing The high performance of SYLGARD HVIC is a direct result of and flashover protection in the most hostile environments. It lasts its weather resistance and electrical characteristics. These special longer than other coatings and greases, providing significant features include: savings in maintenance and replacement costs. One application of SYLGARD HVIC generally leaves insulators virtually • Long-term water repellency/hydrophobicity. This is invaluable to high voltage applications because without it, contaminants maintenance free for many years. on the surface of the insulators become wet and produce a conductive layer of ionisable material. This contributes to an increase in leakage current and probable flashover. The problem with other “solutions” Previous methods to protect insulators from flashover caused by • Resistance to atmospheric and chemical degradation. The coated insulators remain unaffected by salt air, airborne pollution have included changes in insulator design to provide pollutants, rain or humidity. longer leakage paths and installation of conductive glazed insulators to ensure continuous surface-drying currents. • Resistance to arcing and corona. SYLGARD HVIC does not degrade to conductive by-products when exposed to electrical Changing insulator specifications to provide longer leakage paths discharge. results in increased weight and higher initial costs. Although an improvement, these installations still require frequent washing or greasing in polluted areas. Conductive glazes often lose stability and increase losses through their consumption of electricity. The result is lower reliability, higher running costs and frequent insulator changes 132kV substation at Anglesey Aluminium Metals, UK. Les Ankers, the substation maintenance Frequent water washing or repeated applications of hydrophobic engineer, commented “before we greases are also methods used to combat pollution. applied SYLGARD HVIC we were always on a knife edge when frequent flashovers almost stopped Water washing requires expensive equipment and has to be the smelting process, however repeated frequently. The hydrophobic grease technique is labour since the application of SYLGARD HVIC 10 years ago we have not intensive, messy and disliked by linemen. Neither of these experienced a single flashover. In addition we have eliminated the methods provides the long-term protection expected by the need for insulator cleaning and modern utility maintenance engineer. greasing”. © 1998, 2001 Dow Corning Corporation. All rights reserved.
  • High reliability, long service means lower lifetime costs. With SYLGARD HVIC, one application does it all – for years, SYLGARD HVIC – the superior coating eliminating the need for repeated water washing or greasing and We at Dow Corning believe that SYLGARD HVIC is clearly this results in significant savings in maintenance and replacement superior. Only SYLGARD HVIC – with its unchanged formulation costs. Time and again SYLGARD HVIC has proven the long over the last 25 years and combined with an unparalleled field lasting, reliable and most economical solution. application history can provide true peace of mind, long term, SYLGARD HVIC is supplied as a white, one part room uninterrupted reliability and lowest life time running costs. temperature vulcanising (RTV) silicone elastomer dispersion in a high flash point (40°C [104°F]) naphtha spirits solvent. Prove it for yourself The product provides un-primed adhesion to glass and porcelain insulators and can be applied by spraying, brushing or dipping. We challenge you to complete an economic evaluation for your Recommendations on proper application, dilution techniques own specific situation. You’ll discover that SYLGARD HVIC and spraying equipment are covered in the SYLGARD HVIC delivers more than just superior performance and better long-term application guide. SYLGARD economics. Why? Because SYLGARD HVIC delivers long-life HVIC is normally applied in two performance without the need for costly repeated maintenance to three coats depending on the procedures. We will provide you with a simple computer cost type of spraying equipment being model which will allow you to compare the costs of installing used. A 10 to 15 minute drying SYLGARD HVIC versus the application of greases or water time between coats is required washing to generate a typical lifetime cost curve similar dependant on the temperature to the example shown below. and humidity. Maximum protection and life SYLGARD HVIC - the lowest cost in the expectancy is achieved with long-term a cured thickness of 0.5 mm (0.020 in). The white colour On a one-time basis in a typical installation, water washing is Insulator coated with SYLGARD HVIC and covered allows visual inspection for usually the least expensive protection against pollution-induced with iron ore dust, 10 years on uniform coating and the flashovers. However water washing needs to be repeated regularly it still shows excellent hydrophobicity. identification of thin spots. so to evaluate the long term costs of water washing vs. grease and SYLGARD HVIC, a typical calculation as below should be Porcelain and glass surfaces should be dry and clean before untertaken: application. If silicone (or other) grease has been previously used on the insulators, this should be completely removed by wiping and the surface cleaned with isopropyl alcohol before application Cost, $ Total costs for one 45kV insulator over 15 years 1000 of the SYLGARD HVIC. 900 800 Long field-testing proves quality 700 600 For more than 25 years Dow Corning customers have been using 500 SYLGARD HVIC throughout the world – from Argentina to 400 Alaska, from Saudi Arabia to Singapore, and test sites such as 300 these have proven that SYLGARD HVIC is the superior coating. 200 At many of the test sites, arcing and flashovers had been causing 100 frequent outages – up to once a month. In most cases, once 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SYLGARD HVIC was applied, arcing and flashover were Time, years eliminated. Water washing Silicone grease SYLGARD HVIC Total $900 Total $468 Total $67
  • Assumptions for this specific calculation: • Material/labour costs to water wash one 45kV insulator one time: $15* • Material and labour costs to coat one 45kV insulator with silicone grease one time: $55* • Material and labour costs to coat one 45kV insulator with SYLGARD HVIC: $67* • Water washing is repeated every three months • Grease application repeated every two years • SYLGARD HVIC anticipated life for this example: 15 years * Costs vary; these are in the ranges given to Dow Corning by several utilities In-use service conditions vary widely, so Dow Corning cannot warrant a 15-year life for each installation. The predicted lifetime will depend on the pollution severity and the type of installation and how well it was designed. The cost model provided will allow you apply the specific details which relate to your specific situation, the type and size and numbers of insulator(s), your own experience of water washing or the use of grease, together with local costs of labour and materials. You can then work out the lifetime cost advantage of using SYLGARD HVIC for yourself in your own specific situation Your Global Connection Asia North America Dow Corning Asia Ltd. - Japan Dow Corning Corporation Tel.: +81 3 3287 1151 World Headquarters Tel.: +1 989 496 6000 Dow Corning Asia - Singapore Tel.: +65 253 6611 South America Dow Corning do Brasil Australia & New Zealand Tel.: +55 11 3759 4300 Dow Corning Australia Pty. Ltd. Tel.: +61 1300 360 732 Europe Dow Corning Europe Tel.: +32 (0) 64 880 000 LIMITED WARRANTY INFORMATION - PLEASE READ CAREFULLY The information contained herein is offered in good faith and is believed to be accurate. However, because conditions and methods of use of our products are beyond our control, this information should not be used in substitution for customer's tests to ensure that Dow Corning's products are safe, effective, and fully satisfactory for the intended end use. Suggestions of use shall not be taken as inducements to infringe any patent. Dow Corning's sole warranty is that the product will meet the Dow Corning sales specifications in effect at the time of shipment. Your exclusive remedy for breach of such warranty is limited to refund of purchase price or replacement of any product shown to be other than as warranted. DOW CORNING SPECIFICALLY DISCLAIMS ANY OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY. DOW CORNING DISCLAIMS LIABILITY FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES. WE HELP YOU INVENT Dow Corning and SYLGARD are registered trademarks of Dow Corning Corporation. THE FUTURE.TM TM WE HELP YOU INVENT THE FUTURE is a trademark of Dow Corning Corporation. © 1998, 2001 Dow Corning Corporation. All rights reserved. www.dowcorning.com Form No. 11539-5290200