60071-3 | Iec

Assume ( k_sa = 1.10 ) (indoor valve hall) → ( U_rw = 920 \times 1.10 = 1012 , \textkV )

Standard LIWV from IEC 60071-3 for ±500 kV: choose 1050 kV (closest standard value). Iec 60071-3

[University/Department – For academic purposes] Assume ( k_sa = 1