No, I understand now - the tap winding is centrally neutered.
Like a tom cat ?
No, I understand now - the tap winding is centrally neutered.
If you pull the centre of the winding to earth then view the two outputs on a scope, surely you'd see two sine waves 180degrees out with reference to earth?
like this:
http://www.beananimal.com/media/3246/split-phase-sine-wave.gif
I'm not really sure how that differs from two phases 180degrees apart?
Speaking from ship systems - a 220V supply (or any other voltage supply for that matter) on the ship is floating. There is no tie to ground so the potential difference between any one wire of the supply is only 110V to ground.
Speaking from ship systems - a 220V supply (or any other voltage supply for that matter) on the ship is floating. There is no tie to ground so the potential difference between any one wire of the supply is only 110V to ground.
WRONG
If the supply is floating without any connection to ground ( or hull ) then there is no supply generated potential between any wire and ground.
There will be induced potentials and these could be very high voltage but ( hopefully ) very low energy meaning taking any current reduces the voltage to near zero. A fault in equipment could lift the supply to a dangerous level above ground (hull). A radar unit with a defective high voltage unit for its magnatron could create a high voltage potential with high energy capability between supply and ground.
All the ship born supplies I ever saw were referenced to the hull in some way. ( working for Staveley Smith Controls in 1969-70 )
But the LV side is floating.
How can there be any PD to ground if the supply is not tied to it anywhere?There is no tie to ground so the potential difference between any one wire of the supply is only 110V to ground.
I never realised that nobody in the USA has ever been killed by their 110V supply.110V tingle
Measured what, between what?I work for a popular british cruise line and have been there and measured it myself.
Between what and what?I've measured 680V on a light fitting befor
So a 220V lamp was quite happy with 680V across it?- it was a 220V fitting, but it was still working!!!
Ships back then ran mostly on low voltage DC and used steam to power them. Things have changed since!
Sitting on a crank shaft - i hope not inside the engine - certain death if it started up! We'd get sacked for entering a non isolated engine now. Which ship was that on by the way?
How can there be any PD to ground if the supply is not tied to it anywhere?
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