Out of phase switching on step up transformer
Out of phase switching on step up transformer
(OP)
Hi folks,
Anyone has faced problems with transformer out of phase switching?
Is this condition worst than a three-phase short circuit?
Considering a two windings transformer, what about the sense of the winding currents during this condition? Opposite, like in the short circuit condition?
Thank you for any reply.
Anyone has faced problems with transformer out of phase switching?
Is this condition worst than a three-phase short circuit?
Considering a two windings transformer, what about the sense of the winding currents during this condition? Opposite, like in the short circuit condition?
Thank you for any reply.
Best Regards,
Herivelto S. Bronzeado
Brasília, Brazil
http://www.linkedin.com/profile/view?id=46319837&a...






RE: Out of phase switching on step up transformer
RE: Out of phase switching on step up transformer
RE: Out of phase switching on step up transformer
RE: Out of phase switching on step up transformer
At first I thought the currents would be double but then I considered that the impedances would also be doubled. The result for equal transformers would be similar to a bolted fault on each one (neglecting external impedances).
However, in the case of transformers with unequal impedances, the current would be the result of the sum of the voltages of both transformers driving the current through the sum of both transformer impedances. This may result in a greater than expected current through the "less equal" transformer. The magnetic forces may exceed the strength of the bracing in the less equal transformer.
Bill
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"Why not the best?"
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