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Distinctions of EasyQuench Line Arresters Versus Conventional Metal Oxide Arresters ALEXANDER NEFEDOV Distinctions of EasyQuench Line Arresters Versus Conventional Metal Oxide Arresters Alexander Nefedov Streamer Electric Inc. 2015 INMR World

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Distinctions of EasyQuench Line Arresters Versus Conventional Metal Oxide Arresters

ALEXANDER NEFEDOV

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Distinctions of EasyQuench Line Arresters Versus Conventional Metal Oxide Arresters

Alexander Nefedov

Streamer Electric Inc.

2015 INMR World Congress, 18-21 October, 2015

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Content

1. Introduction
2. Company info
3. Technology
4. Testing
5. Application
6. Summary and conclusion

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Introduction

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Company info

20 years of operation in the field of lighting protection Over 20 patents 4 main locations all over the world: St.Petersburg, Moscow – HQ, domestic sales, R&D, manufacturing Chur, Rapperswil (Switzerland) – international sales, R&D Beijing (China) – China representative Bangkok (Thailand) – South-East Asia representative Over 1 million pcs. installed in 12 countries

200 400 600 800 1000 1996 1998 2000 2002 2004 2006 2008 2010 2012 2013 2014

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Company info

Utilities in 12 countries are already familiar with EasyQuench line arresters Russia Belorussia Kazakhstan Ukraine China Iran UAE Vietnam Indonesia Thailand Brazil Switzerland Malaysia (upcoming)

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Technology

EasyQuench™ system

4 3 2 2 1 4 1 4 2

а) b) c) d)

a) top view; b) front view, initial stage of spark discharge; c) front view, final stage of spark discharge; d) discharge chamber cross-section, side view. 1 – silicon rubber profile; 2 – intermediate electrodes; 3 – discharge chambers; 4 – spark discharge channel.

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Technology

Examples of EasyQuench line arresters

ReDDragon – specifically developed for China “Distribution class” line arrester SAi20z Line arresters for protection against direct lighting strikes

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Testing

“Follow current interrupting test”

Power grid simulating circuit parameters: Lighting impulse generator parameters: Ieff = 1…7 kA Ueff = 1…60 kV Imax = 1…30 kA Typical current impulses: Direct lighting strike: 8/55 µs Back flashover: 1/50 µs Umax = 250 kV Different operational principle -> different follow current interrupting test Follow current = short-circuit current in the location of arrester’s installation Several kA vs several A for EGLA (IEC 60099-8)

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Testing

“Follow current interrupting test”

Current, kA Voltage, kV Time, ms

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Testing

Lighting discharge capability test

18 discharge operations (as per IEC 60099-8) 230 µs @ 16 kA => 2.4 C (limited by lab capability) Complete performance and characteristics conservation (verified by follow current interrupting test) 2.4 C for a “distribution class” arrester (Urated = 24 kV)

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Testing

High current impulse withstand test

Very important for conventional metal-oxide arresters Not that important for EasyQuench arresters, but can be easily passed 4/10 µs @ 65 kA => “distribution class” arresters 4/10 µs @ 100 kA => can be achieved with insignificant modification of EasyQuench system

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Application

Footing resistance

High footing resistance isn’t always bad For EasyQunech arresters it provides additional follow current limiting effect No need to arrange separate grounding “Natural” footing resistance of a pole is enough

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Application

Pilot projects

Areas with high lighting activity (>15 strikes/km2/year):

Faster and clear results of pilot projects;
Advantages become sharper and more obvious.

“Bold” utilities:

Eager to try something new because of previous

negative experience with conventional lightning protection solutions;

Ready to continue cooperation and equip more lines.

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Application

Pilot projects

Main test sites:

Malaysia
Indonesia
Thailand
Vietnam
China
Brazil

Positive results and feedback from utilities

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Summary and conclusion

Conclusion

1. EasyQuench line arresters have been developed to protect overhead lines from cutoffs and provide reliable and uninterruptable power supply of customers. 2. Operational principle of EasyQuench line arresters is based on dissipation of excessive energy

f a lightning-caused overvoltage and power arc quenching by the means of a large number of

elementary discharge chambers. 3. EasyQuench line arresters for distribution lines are able to transfer at least 2.4 C with maintaining all main characteristics, including follow current interrupting capability. High current impulse test with amplitudes up to 100 kA is also not an issues for EasyQuench line arrester.

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Summary and conclusion

Conclusion

4. Follow current interrupting test for EasyQuench line arresters is performed in a very special way and includes two types of simultaneous impacts – lighting impulse plus power arc. The value of follow current in such test is equal to fault current value of modern distribution networks. 5. Footing resistance of a pole is not so crucial for EasyQuench line arresters and might be considered as an extra current limiting factor. 6. Pilot projects in areas with high lightning activity help to verify performance of EasyQuench line arresters within relatively short period of time and reveal superiority over conventional solutions.

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Distinctions of EasyQuench Line Arresters Versus Conventional Metal Oxide Arresters

Alexander Nefedov

Thank you for your attention!