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A traveling wave 400 ∕ 1 ∕ 50 means crest value of
400 V with rise time of 1∕ 50 s
400 kV with rise time 1 s and fall time 50 s
400 kV with rise time 1 μs and fall time 50 μs
400 MV with rise time 1 μs and fall time 50 μs