Items considered : TRV and circuit configuration ; TRV for the first, second and third pole to clear ; Collection of TRV field data ; TRV under short line fault ; TRV in case of transformer fed faults ; TRV in cade of series reactor limited faults ; TRV in case of faults at the secondary side of transformers ; clearing faults near capacitor banks ; arc-circuit interaction ; topology of test circuits to represent realistic system conditions.