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Surge protection for systems <66kV

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kaspor

Electrical
Joined
Aug 12, 2021
Messages
52
Location
AU
hello

I have read in some literature that switching surges in systems <66kV do not typically exceed equipment BIL ratings.

Is this true? If so, have you come across this conclusion in a standard or any other literature? Looking for some further references.

Thanks
 
Switching impulse test is specified for transformers rated 220kV and above. For lower voltage ratings, lightning impulse test is adequate. You can refer IEC 60076.
 
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