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rated voltage of arrester

rated voltage of arrester

rated voltage of arrester

(OP)
Hi.

i already have arrester with rated voltage is 144kv for 150kv  system voltage,

how do you determine the rated voltage of an arrester for 275kv system voltage? type metal-oxide w/o gaps.

IEC60099-4, tabel 2 gives range of rated voltage 96-288(kv r.m.s) with steps of rated voltage 12kv. what does it mean?

thank you

 

RE: rated voltage of arrester

Let me share my school knowledge with you.

A protection marge as 1.15 is selected. This is the ratio of a voltage level and the protection voltage level.
The voltage level is the strength level of the protected device.
The protection level is:

V2 = Va (arrester voltage) + Vb (connection voltage) + 2ml/v

This is just what I remember from my notes. That may give you an idea...  

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