NT-111 High Voltage Insulator Coating is a new generation with nano-technology one-part room temperature vulcanizing silicone coating. The coating exhibits highly hydrophobic and arcing resistance and is designed to improve the performance of porcelain or glass insulator. The coating could significantly depress the leakage current and dry band arcing and totally prevents the tracking and flashover. It provides a virtually maintenance–free power system. The nano-technology additive extreme increase the strength of silicone coating that proves NT-111 not only have a long term performance but also will not be affected by ozone, UV light, temperature and corrosive environments(salt-fog, industry dust and mist of hydrochloric acid or sulfuric acid, etc.)
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| 220 KV Ping-Shan Substation |
Due to excellent properties of NT-111 the coating could eliminate or reduce the routine maintenance as the following:
- Regular insulator water washing.
- Periodic re-application of silicone grease or compound.
- Replacement of insulators damaged by flashover.
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| 500 KV Ling-Dong Jia Line |
*Applied unique nano-technology and exhibited highly hydrophobic and arcing resistance. It significantly depresses the leakage current and prevents flashover on insulators.
*Specially formula of one-part RTV silicone coating, designs for easy application on both substation and transmission line.
*Stable weatherability, proves coating will not be affected by ozone, UV light, temperature and corrosive environments.
*Provide highly protection for all kind of contaminations that include heavy salt-fog, industry dust and chemical mist.
*correspond to IEC60587 Class 1A 4.5.
Application
The surface of insulator must be thoroughly clean and dry. In general that use high pressure water washing will be enough for most case. If insulator have previously been coated with silicone greases or other type of compounds, it would be hard to get it off by only water washing. The workers should scrape the greases off by scraper first and then hand wiping the residual grease film with paraffin and naphtha. If the surface contaminated cement like material, the dry abrasive have to be applied with crushed corn cob.
The methods of coat on insulator include brushing, dipping and spraying. Usually the coating has to be applied from one to three layers that depend on the coating methods. When applied by brushing or dipping, usually one coat is sufficient to obtain complete coverage. When applied spraying it needs two or three coats and depends on the equipment we use. Each coat can be applied after the surface of previous coat is tacky.
According to IEEE std 1523-2002 the thickness of dry layer is about 15 mil to 20 mils (0.4 mm to 0.5 mm). When apply coating for only few insulators, we can coat by the way of brushing. If we try to apply coating on suspension insulator, dipping is the best way. If we try to apply coating on an entire substation, spraying is the best way. It is also cost efficiency and will form a smooth silicone elastomer surface. The details about how to apply the coating on insulators please refer to the HVIC Field Application Guide.
NT-111 High Voltage Insulator Coating can be sprayed for live line application but must be used high-flash point carrier solvent. It could keep it off the fire. The application has to be operated by professional workers with a special design tool.
Packaging
ELPLUS NT-111 is available in 4 kg (1 gallon can), 20 kg (5 gallon pail), 10 lb (1 gallon can) and 45 lb (5 gallon pail).
Colors
ELPLUS NT-111 standard colors are dark grey and white. Other colors are available by request.
Storage
ELPLUS NT-111 when store at or below 32 oC in original unopened container has a shelf life for 12 months from date of production.
Safety precaution
Adequate ventilation should be provided when apply HVIC in closed type environment. Contact uncured coating may irritate eyes. Flush well with water and call a physician. The details please refer to Material Safety Data Sheet.
Uncured
Type One-Part Silicone
Appearance Smooth Paint
Specific Gravity 1.22
Cure System Oxime
Tack-free 30 minutes
Solid Content 72%
Viscosity 10000±1000cps
Cured – at standard condition* for 7 days
Dielectric strength 455 V/mil
Dielectric constant 3.8(at 100Hz)
Volume Resistivity 3.75 x1015Ω/cm
Dissipation Factor 0.022(100Hz)
0.016(100KHz)
Dry arc resistance Track > 180s
Burn out > 420s
IEC 60587 1A4.5
*Standard condition is at 25 Degree Celsius and 50% R.H.
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