Transformer Powering Reading
Transformer Powering Reading
(OP)
we powered up a 12.47kv/4.16kv, three phase, delta-wye XFMR and the follwing readings were taken:
A to B 4160
A to C 4160
B to C 4160
A to A 5kV
B to B 2.5KV
C to C 2.5KV
A to Gnd 2.4kV
B to Gnd 2.4kV
C to Gnd 2.4kV
what seem to be the problem? we've the doble and TTR testing before powering up, everthing seems fine.
A to B 4160
A to C 4160
B to C 4160
A to A 5kV
B to B 2.5KV
C to C 2.5KV
A to Gnd 2.4kV
B to Gnd 2.4kV
C to Gnd 2.4kV
what seem to be the problem? we've the doble and TTR testing before powering up, everthing seems fine.






RE: Transformer Powering Reading
A to A 5kV
B to B 2.5KV
C to C 2.5KV
RE: Transformer Powering Reading
A to B 4160
A to C 4160
B to C 4160
A to Grd 5kV
B to Grd 2.5KV
C to Grd 2.5KV
A to N 2.4kV
B to N 2.4kV
C to N 2.4kV
Then I would say that the neutral is not connected to ground.
RE: Transformer Powering Reading
If the primary source was impedance grounded, you would get a voltage difference between the secondary ground and the primary neutral point. This could explain the different voltages.
RE: Transformer Powering Reading