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Why doesn't the primary winding on a transformer have a neutral?
Wiki User
∙ 13y ago
In a three phase transformer, the primary winding is often configured in a Delta. The delta winding configuration does not use a neutral. The secondary winding is often in a Wye configuration, which does have a neutral.
The Delta configuration is typically used for transmitting power to various locations, and thee phase loads where a neutral is not needed. The Wye configuration is typically used to distribute power in a facility where there are single phase loads that need a neutral.
There are other reasons to use either Wye or Delta, such as grounding issues, but I think the short answer is probably what you're looking for (I hope).
Hope this helps!
Dave
Wiki User
∙ 13y ago
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The only time that there will be zero current flow on the neutral is when the panel is completely balanced on both legs. When you state that the "tester is put on the neutral wire" suggest that the wrong kind of meter or meter scale is being used to test for current. The amperage testing of conductors is done by inserting a meter in series with the conductor or a meter has to be clamped over the wire to measure its magnetic flux of the current going through the wire. If you have mistakenly used a voltage meter to do the test, you will have a zero potential because the neutral and ground wire are bonded together and will have no reading between each other. The same will occur if you are trying to use probes and read off of the amps scale. The probes have to be in series with the circuit to get a reading.
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Why don't we supply to DC to the transformer?
When we give d.c supply to a transformer the primary winding will burn because constent flux will be will be produced which doesnt link with secondary so max current will circulate on primary winding only
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