Generator voltages

[bibi1964]

hi

a friend asked me a question:
In the generator test, the voltage between phase and zero was measured
400,400,230
What could be the problem?

thanks

 

[RRaghunath]

It seems Blue phase terminal and star point (neutral terminal) got interchanged it looks.
It could be in the generator terminal box.

Rompicherla Raghunath

 

[waross]

Operator error.
A-B = 400 Volts
A-C = 400 Volts
A-N = 230 Volts.
The tester inadvertently interchanged one phase and the wye point when testing.
Instead of testing from neutral to A, B, and C he tested from A to B, C, and neutral.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[bibi1964]

hi
Further to the question I asked:
Regarding to the attach drawing if I change the connection between points 9 and 12 this mean the star point (4,8,9)
What tensions will I measure between the phases and and neutral
L1-N
L2-N
L3-N

thanks

 

[waross]

Tiredly, 230 V, 230 V and 230 V.
Se my previous post.
To see 400 Volts you are measuring phase to phase. A-B, and A-C. To see 400 Volts from two 230 Volt windings the phase angles are correct.
Your friend had one phase interchanged with the neutral when he took his measurement.


Bill
--------------------
"Why not the best?"
Jimmy Carter