Hi all,
I have the following doubts:
[1] In the past 23 years of my service, I have only seen every ship being built in my yard with 3 Phase, 3 wire system with the neutral isolated. why is it that 3 phase 4 wire not used on a ship like in a land based power system?
[2] Earlier we used to procure Galley equipment for such a system and off late we are procuring COTS (commercial off the shelf) items which require a Neutral. This is being achieved with a local Delta / Star transformer with its neutral grounded to ships hull. The Galley equipment get their supplies from the secondary phase to this neutral. What effect could this have on the EMI signature of the hull .
[3] is this forum appropriate to ask questions on EMI/EMC?
By the way we also connect every equipment body to the hull with a bonding strap to maintain an equipotential surface. Anyone have any ideas? Anything historical or is it to do with protection and telemetry aspects. An underlying physics would be helpful to me in understanding this.
--
Regards,
I have the following doubts:
[1] In the past 23 years of my service, I have only seen every ship being built in my yard with 3 Phase, 3 wire system with the neutral isolated. why is it that 3 phase 4 wire not used on a ship like in a land based power system?
[2] Earlier we used to procure Galley equipment for such a system and off late we are procuring COTS (commercial off the shelf) items which require a Neutral. This is being achieved with a local Delta / Star transformer with its neutral grounded to ships hull. The Galley equipment get their supplies from the secondary phase to this neutral. What effect could this have on the EMI signature of the hull .
[3] is this forum appropriate to ask questions on EMI/EMC?
By the way we also connect every equipment body to the hull with a bonding strap to maintain an equipotential surface. Anyone have any ideas? Anything historical or is it to do with protection and telemetry aspects. An underlying physics would be helpful to me in understanding this.
--
Regards,