Vlotage Limits for shore power connection to Naval Vessels
Vlotage Limits for shore power connection to Naval Vessels
(OP)
Does anyone know of the standard that defines the voltage limits that must be normally maintained for a shore power connection to naval vessel at 60 HZ 460V nominal i.e what is the allowable+/- percentage






RE: Vlotage Limits for shore power connection to Naval Vessels
Most equipment onboard ships are fairly standard and probably designed for the same voltage tolerances as their firma terra counterparts.
But I do not know for sure. Must be someone out there that has the standards available.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Vlotage Limits for shore power connection to Naval Vessels
We were asked to readjust our normally 480 VAC output generator down to below 470 before ships crew would attempt close.
RE: Vlotage Limits for shore power connection to Naval Vessels
Applying the narrow tolerance (5%) to 480 V gives upper and lower limits 504 V and 456 V. Standard tolerance limits give 528 V and 432 V.
That ship's crew were either bean counters or newbies.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
Mil-std-1399 section 300A or DOD-std-1399 section 300A or STANAG 1008 defines tolerances for normal power.
http://assist.daps.dla.mil/quicksearch/
RE: Vlotage Limits for shore power connection to Naval Vessels
This is confusing. Does that also apply to commercial ships? Or is it just the navy? I have seen installations on European ships that seem to follow normal "land" standards.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Vlotage Limits for shore power connection to Naval Vessels
Most of the yardbirds agree that around 450 to 460 is normal for all the vessels that come in. That is my experience as well.
Hope that helps.
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
440V +/- 5% steady state line to line
440V +/- 16% with a recovery time of 2 seconds
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
Where is your application (if you don't mind me asking)
RE: Vlotage Limits for shore power connection to Naval Vessels
As always I am often perplexed by the design of others.
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
RE: Vlotage Limits for shore power connection to Naval Vessels
What about mil-specs? Equipment are supposed to work under very adverse conditions. Is that not valid shoreside?
Considering what an on-board generator can do to the voltage when starting or dumping heavy loads, I do not believe that is a valid reason.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Vlotage Limits for shore power connection to Naval Vessels
Most of the equipment onboard will work fine, but there are always those special pieces of equipment that will suffer abnormal failure rates if you feed them power outside the range. You might not outright blow anything up, especially for short term over/undervoltages, but long-term overvoltages is another thing entirely and it doesn't take too many premature failures of $100k components to justify strict compliance. A lot of this equipment is older than dirt and flakey enough as it is!
MIL-STD-1599/300A Table 1 states 440V +/-5%, which is 462V max, with some allowance outside the range for brief periods.
RE: Vlotage Limits for shore power connection to Naval Vessels