600 kVA Generator installation - 3 phase, 4 wire

[tissparks]

I don't know what modern ships have fitted, it could well be something like impedance earth monitoring and expensive at that. The problem ships have and why they don't have OCPD's is when trying to get an aircraft carrier alongside a jetty say in the restricted areas of the Thames, the last thing you want is the steering gear to fail on an over current. It will come up as an earth fault but that can be investigated once alongside safely when usually everyone's gone out for a beer :17:leaving the engineers to fix things:thinking:.