My point exactly.Correct.
Neutral is Neutral. Must be seen as different from a 'ground'.
Expressed better.
For that, I thank you.
My point exactly.Correct.
Neutral is Neutral. Must be seen as different from a 'ground'.
Larry -Well, the code requires grounding of a neutral.
There is no 'real' neutral in an ungrounded Delta. However, because of capacitance between the three lines and the surrounding world, the lines tend to hover around the same voltage to earth that a sensitive voltmeter (i.e., one with a high input impedance) would actually read that voltage.Even though a delta transformer is ungrounded there still is a neutral point that exists in the middle of one of the phases even though it is not attatched to so the statement that a ungrounded delta system contains a neutral point is true? it just may not be used?
Because one may have only three-phase loads, so no neutral is needed, or one may have machinery whose operation cannot withstand an unplanned shutdown without damage or danger.My question would then be why would people still deal with Delta systems when you can get a lot more versatility out of a 4-wire uni-grounded or multi grounded wye system?
That's easy: bond one of the three lines. It gets's colored white and isolated from ground after the main, and can be switched or breaker'ed, but not fused.And if I wanted to operate this transformer as a 3 phase delta with a grounded conductor how would I get to the grounded conductor connection point? Assuming you did not specify a 4 wire delta when you ordered the transformer.
I was referring to the absolute declaration here:Larry - Not necessarily.
In the sense of the OP, there is no mandated bonding.A wye system has to be grounded/neutral
And if I wanted to operate this transformer as a 3 phase delta with a grounded conductor how would I get to the grounded conductor connection point? Assuming you did not specify a 4 wire delta when you ordered the transformer.
Because one may have only three-phase loads, so no neutral is needed, or one may have machinery whose operation cannot withstand an unplanned shutdown without damage or danger.
In such cases, an ungrounded supply can be used. Because there's no bonding, the first accidental of a ground fault will not cause a shutdown, so the fault can be found before a second fault.
If you mean the OP, I thought he was asking how come a non-grounded Delta measures like a Y with a voltmeter.But that is not what the poster said he said he could pick up a neutral off any delta transformer (if I understood him correctly).
Even though a delta transformer is ungrounded there still is a neutral point that exists in the middle of one of the phases even though it is not attached to so the statement that a ungrounded delta system contains a neutral point is true? it just may not be used?
I have been on a site with a 3 phase wye supply transformer, system was ungrounded all loads were 3 phase 3 wire No nuutral and for sure nor a grounded conductor. I guess I am stupid?
Having even an ungrounded wye system can lead to potentially dangerous overvoltages in the event that there is a re-striking or arcing ground fault on one of the three phases.