I am guessing that a 600 A fuse would blow in under 5 s with a fault current of around 3 - 5 kA, which would be possible if Ze is 0.08 - 0.05 ohms.
The DNO must know the size of its fuses and their blow times (could be more than 600 A, but unlikely to be less) and therefore the maximum possible Ze. I feel sure that they would not just say 0.35 ohms because that would be impossible.
As a matter of interest, how precisely can Ze be measured and with what? I am not thinking of my MFT here. ?
I am guessing that a 600 A fuse would blow in under 5 s with a fault current of around 3 - 5 kA, which would be possible if Ze is 0.08 - 0.05 ohms.
The DNO must know the size of its fuses and their blow times (could be more than 600 A, but unlikely to be less) and therefore the maximum possible Ze. I feel sure that they would not just say 0.35 ohms because that would be impossible.
As a matter of interest, how precisely can Ze be measured and with what? I am not thinking of my MFT here. ?
