Select a station-class metal-oxide surge arrester from
Chapter , Problem 13.24(choose chapter or problem)
Select a station-class metal-oxide surge arrester from Table 13.2 for the high-voltage side of a three- phase 400 MVA, 345-kV Y/13.8-kV D transformer. The maximum 60-Hz operating voltage of the transformer under normal operating conditions is 1.10 per unit. The high-voltage windings of the transformer have a BIL of 1300 kV and a solidly grounded neutral. A minimum protective margin of 1.4 per unit based on a 10-kA impulse current wave cresting in 0.5 ms is required. (Note: Additional considerations for the selection of metal-oxide surge arresters are given in reference [22] (www.cooperpower.com).
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