superhydrophobicity 1
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SUPERHYDROPHOBIC COATINGFOR POLYMER INSULATORS
DEVELOPED BY NEETRAC / GEORGIA TECH
SUPERHYDROPHOBIC COATINGFOR POLYMER INSULATORS
DEVELOPED BY NEETRAC / GEORGIA TECH
MISSISSIPPI CHEMICAL –MOSS POINT EAST 115 KV T.L.
IEEE Insulators WG
7/22/2008
Jack Varner – Southern Company
Frank Lambert –NEETRAC
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Lotus Effect Surface
Lotus Leaf
Lotus Effect Surfaces:
Avoid water sheeting – drops stay as drops
Self Cleaning – remove dust / contamination
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Superhydrophobic Surface Coating• Contact angle≥ 150°
• Water droplets bead up, no “sheeting action”
• Prevents electrical tracking
• Improves insulator performance, especially in
contaminated areas.
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Lotus Effect Surface for Insulators Developed
by Georgia Tech / NEETRAC
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Lab Results
• Works on all
polymer
insulations
• Lasts at least
2000 hours in
energized salt fog
testing
• Increases the
endurance in
accelerated tests
E n d u r a n c e ( % )
TreatedUnTreated
140
130
120
110
100
90
80
70
60
50
100
in Endurance
Improvement
28%
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SUPERHYDROPHOBIC COATING
• Gives insulators superior performance in contaminated environments.• Coating can be applied in several ways:
– Sprayed on in f ield
– Painted on with brush in field – Can be dipped in solution
• Treatment can also be applied to glass and porcelain insulators, but they
must be pre-treated to ensure the solution adheres to the surface.
• Both US and Foreign Patents Filed.
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• Ohio Brass Polymer Silicone Insulators
• Southern Company Transmission Lines
• Test Site at Mississippi Power
• Miss. Chemical –Moss Point 115kv line
Field Test Participants
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Insulator
InstallationSite
MISSISSIPPI CHEMICAL
MOSS POINT EAST
115 KV T.L.
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CHEVRON
PLANTMISSISSIPPI
PHOSPHATE
X
X
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XX
XX
XX STR#: 54
STR#: 55
STR#: 56
H W Y 6 1 1
Wooden H-Frame
Wooden H-Frame
Wooden 3PDDE
XX
XX
XXSTR#: 54
STR#: 55
STR#: 56
H W Y
6 1 1
Wooden H-Frame
Wooden H-Frame
Wooden 3PDDEX
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STR# 54
• Replaced three Suspension Insulators installed in 2005 with three newPolymer Suspension Insulators.
• Insulators were new and NOT Coated with the new solution.
STR #55
• Replaced three Suspension Insulators installed in 2005 with three new
Polymer Suspension Insulators.
• Insulators were treated with the new coating solution.
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Superhydrophobic solution applied to the new Quadri*silTM Insulators
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Superhydrophobic solution on new Quadri*silTM Insulator
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Installing new uncoated Insulator at Str.# 54
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Severe Pin Corrosion was found on all of the Porcelain Insulators which were
removed. These insulators had been in service approximately three years.
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This guy grip had been in service for six weeks. Notice that the loop that
wraps around the anchor attachment point has corroded out of theguy grip.
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This guy wire had been in service for six weeks. Notice that the individual strands
have necked down much like you would expect to see from a tensile failure.
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