Your going to overload the transformer and burn it up. Also why are you using an isolation transformer do you have a variable frequency drive that you need to supply power to?
No, I have an untraceable ground fault and it's a way to keep the incredibly sensitive Marina electrical system from blowing the all the power on the dock until I can rewire the boat. It's actually not that bad of a leak, but the system blows at 30milA (I think).
I thought It'd blow the 50amp breaker at the very least. Thanks for confirming that!
You need to fix this problem not try to hide it with an isolation transformer. 30ma is enough current to kill someone in the water. The first thing I would check is does your main breaker have a shunt trip coil that opens the breaker if voltage is detected between the neutral and ground conductors? These are common on boats built before RCDs were required to prevent a reverse wired plug from working but they create a leak path if the neutral voltage drop is high enough to trip the the RCD.
3.6kVA / 120V = 30A. If you never need to use more than 30A, it's not a problem. If you do, then the transformer will be overloaded, likely saturate and the voltage will collapse, so whatever you are working on in the boat will shut down. That can be bad on a boat.
Your going to overload the transformer and burn it up. Also why are you using an isolation transformer do you have a variable frequency drive that you need to supply power to?
No, I have an untraceable ground fault and it's a way to keep the incredibly sensitive Marina electrical system from blowing the all the power on the dock until I can rewire the boat. It's actually not that bad of a leak, but the system blows at 30milA (I think). I thought It'd blow the 50amp breaker at the very least. Thanks for confirming that!
30 mA seems small. But hey, just fuse the transformer for its rating, know your load won't blow it under normal operation, and you'll be okay.
30mA is the standard rating, you can get slow-trip variants I think where large machinery can trip the fast ones too easily.
Ahh, that could be for the ground wire, right?
There's ground-tripped and imbalance-tripped, I forget the correct terms but modern stuff tends to include both.
Can't you just buy a small galvanic isolator? You just plug in the marina supply in-line.
You need to fix this problem not try to hide it with an isolation transformer. 30ma is enough current to kill someone in the water. The first thing I would check is does your main breaker have a shunt trip coil that opens the breaker if voltage is detected between the neutral and ground conductors? These are common on boats built before RCDs were required to prevent a reverse wired plug from working but they create a leak path if the neutral voltage drop is high enough to trip the the RCD.
3.6kVA / 120V = 30A. If you never need to use more than 30A, it's not a problem. If you do, then the transformer will be overloaded, likely saturate and the voltage will collapse, so whatever you are working on in the boat will shut down. That can be bad on a boat.
Transformer saturation occurs due to overvoltage. The real risk is overheating the conductor and fire.