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Pufferphish

Lightning/Surge Arrester meter?

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Hi, saw what look like meters at the bottom of some lightning arresters for a transformer in a main outdoor substation.  I've never seen them before, anyone know what they are or used for?  Some sort of sensing or indication if there is a surge perhaps?  Thanks!

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This appears to be some sort of surge counter and/or AC leakage current monitor for the arrester.

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It is a surge counter that increments when a surge over voltage or over current is exceeded. 

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