Supply & Application of 8,000kg of Epsilon Midsun HVIC by Epsilon Asia Group: 2011

Supply & Application of:

Epsilon Midsun 570 Gen-4 RTV HVIC (High Voltage Insulator Coating) and

Epsilon Midsun 579 RTV Anti-Corrosion Coating

At

Udupi Power Corporation Ltd. (Previously known as Nagarjuna Thermal Power Plant)

• Established over 25 years ago, LANCO is a leader in the Power

Sector in India

• Emerging as a top-3 Power Sector Developer in India with

projects as follow:

• Under Operation: 4,410 MW

• Under Construction: 4,968 MW

• Under Development: 7,103 MW

About LANCO Group

Epsilon: Key Partners in India

• Epsilon an engineering company and is

exclusive national partners with:

• Dongfang India for Minimal-Oil Boiler

Combustion Systems

• Dongfang-Hitachi VFDs, PV Inverters

• SYCG/Nexans XLPE Cable

• Epsilon Midsun HVIC & Silicones

UPCL Switchyard Overview

• Insulators prone to severe contamination due to:

– Coastal Location

– Cooling Tower Drift as Seawater is used for cooling

– No Drift Eliminator Installed at the Cooling Towers at the time

• Extreme Leakage Current & Corona observed

• Frequency of unplanned outages due to flashovers was increasing rapidly

• Extreme Corrosion on JBs and metal infrastructure observed

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UPCL 400kV and 220kV Switchyards Prone to contamination due to Location and Cooling Tower Drift

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Contaminated Insulator Surfaces

• Despite Extremely frequent Washing Cycles,

pollution deposits were unavoidable

• The salt deposit in this image is within 7

days of the previous wash

Extreme Corrosion to Ferrous Infrastructure

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• Metal Infrastructure Corroding

within 18 months

• Such Corrosion Results in

degrading IP54/IPxx ratings

which pose a safety risk

• Changing JBs requires re-

commissioning of equipment

• After coating with EM 579,

Resistance to Corrosion

Fortified

Corona Visible with the naked eye

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Corona Visible through UV Corona-Cam

Watch the video clip at: http://www.youtube.com/watch?v=NLZRZ6mYd2M

Targets:

Mitigate Risks of Leakage Current

Reduce the need for Insulator Washing

Mitigate Risks of Flashovers

HVIC of LANCO’s Choice:

Epsilon Midsun 570 Gen-4 RTV Ultra-Hydrophobic RTV High Voltage Insulator Coating (HVIC)

Conductive Tracking Path Cannot be Formed

(All drops of water are discrete)

IEEE Evaluation of RTV Coating in Coastal Conditions

• IEEE Evaluation of RTV Coating for Station Insulators subjected to Coastal Pollution – H.M Schneider, Senior Member, EPRI High Voltage Research

Centre)

•Performance of Breaker Support Insulators (BSIs) tested before and after application of RTV Coating •Resistance to Flashovers tested in field tests to check for additional equivalent creepage imparted by the coating

… The results

Measurements are given in ESDD as: Quantity of NaCl per unit area (mg/cm2) Test Reports showed ESDD as high as 0.034 mg/cm2 several months after wind storms, natural and manual washing •Uncoated BSIs flashed over at 209kV •RTV coated BSIs flashed over at 300kV Improvement of performance of:

43.5% withstand voltage

Hydrophobicity Recovery (CPRI labs Test)

Hydrophobicity Tested (CPRI Labs)

Hydrophobicity Classification (HC level as per STRI)

Virgin Sample HC 1

After 100-hours continuous exposure to Corona

HC 6

Epsilon Midsun Hydrophobicity Recovery within 48 hours of Corona Destruction

HC2

•It is essential for the silicone material to recover its hydrophobicity for long-term effective performance •Epsilon HVIC Test Results of Hydrophobicity recovery at CPRI

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Hydrophobicity (Water-Repellency) Classification

Hydrophobicity Classification (HC) goes from HC1 to HC7 HC1: Completely Hydrophobic HC7: Completely Hydrophilic

Typical Examples from HC1 to HC6

HC Description

HC1 Only discrete droplets formed. θr≈80° (or larger) for majority of droplets

HC2 Only discrete droplets formed. 50°<θr< 80° for the majority of droplets.

HC3 Only discrete droplets formed. 20°< θr<50° for majority of droplets. Usually they are no longer circular

HC6 Wetted areas cover > 90% small un-wetted areas still observed

HC7 Continuous water film

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Application Procedure

Surface Preparation

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Gentle Scraping of Salt Deposits

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Agitate Epsilon Midsun HVIC prior to Application

Application of Epsilon HVIC

Airless Spray Application

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Application of Epsilon HVIC

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Corona Eliminated on Coated Insulators

(as viewed with a UV Corona cam)

Watch the video clip at: http://www.youtube.com/watch?v=NLZRZ6mYd2M

Epsilon HVIC Team

Safety Training + Documentation

29-30 SEP 2011

Scheduled Start:

01 OCT 2011

Actual Start:

01 OCT 2011

Scheduled End:

31 OCT 2011

Actual End:

98.5% job completed by 31 OCT

2011

At least 7 working days were lost due to UPCL not

being given shutdown permission by Karnataka

State Government

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A few of Epsilon’s HVIC Customers

Our sincere thanks to UPCL and the LANCO Group

Epsilon Asia Group X29 Hauz Khas, New Delhi, India

Level 29, Offices at CentralWorld, Bangkok, Thailand +91. 11. 4101.4888; www.epsilonasia.com