using 270Vdc as input power
What are the separation criteria of this line what are the wiring protection needed And more
Please help me find information on this subject
tnks
HAIM
:oops[/i]
i need info on this topic fast
pls can someonr help
tnks
haim
270 V DC as input power instead of e.g. 230 V AC requires the same kind of wiring. If you think in terms of ordinary 230 V AC cabling, isolation and connections this would do fine for connection to 270 V DC as well. The peak voltage of 230 V AC is 230*SQRT(2) = 325 V which exceeds 270 V.
There may be legal safety requirements for your situation. I agree with the above post that technically this is less stringent than 230 AC.
One thing to keep in mind is that all switches and relays that control the application of the 270 V should be rated for the voltage and ccurrent you are using and DC at that.
AC is much easier to switch because as the contacts spread apart they arc but the ac goes to zero rapidly and the arc is for a short time. For DC it is for a long time and will damage the contacts eventually.
Arcs have the property that once they start, it takes a much longer gap to extinguish them than to start them. In other words, air is nonlinear.
thnks all
but what about products to 270 v
or wab site about it
pls help me find
thnks all
again
270 V DC is mainly used in Military Aircrafts.
Not completely true... You must also take consideration of the power dissipation, that is not the same for DC and AC.
AC has cos(phy) to consider and instantaneous power dissipation is variable, not so DC...
-OT mode ON- (sorry)
ELECTRON, sei di Pisa? (are you from Pisa?)
-OT mode OFF-
270 V DC is mainly used on new Aircrafts !
hi
Iagree with above , besudes you should consult rthe company that produced the source you are speaking about
regards
To whom it may concern:
The newer aircraft that 270VDC power is used specifically on is the latest fighters as well as a few UAV's and other military ground support and missle support systems worldwide. The legasy aircraft still use 400Hz, but are more and more sensitive and power hungry. In some cases the power for aircraft through 4 receptacles exceeds 360kVA from one power unit....momentarily 5 times that in some cases.
The 270VDC power is used because it is more efficient, uses lighter components and has faster reaction times from those components. 400hz is the standard for almost all other aircraft except when dealing with smaller aircraft and helicopters, which require 28VDC power. Currently the aviation market is looking at 270VDC as a new animal, but it has been in use for many years, possibly 15 or more. I have only been invloved in newer platfomrs for the last 13yrs.
Aircraft hangar designs for supporting both 400Hz and 270VDC aircraft are a unique and specialized trade very few have knowledge of ; )