# Work related

Discussion in 'General Electronics Chat' started by smitty13, Jul 22, 2008.

1. ### smitty13 Thread Starter New Member

Jul 22, 2008
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The Plant I work use's a three phase delta transformer to run there equipment I'm having trouble explaining why, on (A) phase the voltage is lower than (B) & (C) phases. Please help explain?

2. ### SgtWookie Expert

Jul 17, 2007
22,183
1,728
How much lower?

Actually, what are you measuring on each phase, and how are you measuring it?

Phase to phase, or phase to a neutral somewhere?

If your secondary winding is indeed a delta, you'll only be able to measure phase to phase. If it's a wye-wound, you'll have three phases and a neutral.

3. ### theamber Active Member

Jun 13, 2008
318
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Because you are measuring A to the neutral which is center tapped.
For example in a 120/240 four wire Delta High leg.
A to Neutral is 120 but if you measure A to B, B to C or A to C you will get 240 in all.
You should buy Ugly's Electrical References booklet.

Last edited: Jul 23, 2008