Lightning A or Surge A?

[dalas]

Hi,

what is the main purpose? if you install a Lightning Arrester (or Surge Arrester?) with a power transformer 150/20 kV 60 MVA on HV side.
as lightning protection or switching ?

best regards

 

[edison123]

To protect the transformer windings from lightning induced high voltage surges in the transmission lines by shunting such surges to ground.

 

[dpc]

IEEE changed the name from "lightning arrester" to "surge arrester" a long time ago. It protects against transient voltage surges, regardless of the source.

 

[magoo2]

Depends on where you live. Some areas have little lightning activity and switching surges would dominate.

Correct answer is both lightning and switching surges.