Interested to know what safeguards are normally used when divers are in the water with a HV ROV.
IMCA D045 specs a maximum 20ms trip delay for RCD/isometer, which is hard to guarantee, and also seems aimed at smaller equipment types/lower voltages.
As you state most diver support is done with smaller /medium ROVs , Mohicans , panthers , Tigers etc and usually no special precautions other than reasonable separation from diver is made ,,,
Very mature of you T-Boy. You might think all people buy your idea of jokes but I know you have no clue what to say and the best thing for you is to pass a joke. The discussion is beyond your comprehension.
From my experience with work class HV systems , a LIM system offers no protection to personnel on deck due to the slow reaction time of the system and also the line capacitance of the system has a direct affect on the reaction time.
So for a diver, best to keep well away unless you have found a system better than the Bender .
Yes we use Bender and also Megacon LIMs, but they use the same principle, injecting DC.
A full blown earth fault will trip them very fast but for Bender it can be up to 4s response time for a lesser fault (if I remember).
We also use isolating transformers tho (non-earthed neutral), and cut power supply at the first earth fault.
Very interesting to hear peoples experience in this area.
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