Selection of Lighting Arrester

[pukar12345]

Hi everbody,

what is basic rule for selecting lighting arrester for 13.8KV four wire system.

Is there simple formula?


Thanks in advance for reply.

 

[dpc]

If ALWAYS solidly grounded, select MCOV to be about 110 to 120% of the maximum expected operating phase-to-ground voltage. If resistance-grounded or ungrounded, select MCOV to be about 110 to 120% of phase-to-phase voltage.

Assume you meant LIGHTNING arrester. This term is itself obsolete (at least in US) and should now be called SURGE arrester.



David Castor

http://www.cvoes.com

 

[odlanor]

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