Standard LIWV from IEC 60071-3 for ±500 kV: choose 1050 kV (closest standard value).
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For DC withstand: ( U_cw,DC = 630 \times 1.10 = 693 , \textkV ) → ( U_rw,DC = 693 \times 1.10 \approx 762 , \textkV ). Standard DC test voltage = 750 kV (1 min). Iec 60071-3
Insulation Co-ordination for HVDC Converter Stations: A Comprehensive Review of IEC 60071-3 Standard LIWV from IEC 60071-3 for ±500 kV: