Lagging in the Transformer

Are you referring to power factor?

No sir,i said it clear transformer lagging.

Guest,

i fully agree with Wareagle,,it is about power factor. Check it in wikipedia

Have you heard of motor inrush current.the same phenomena happens here.in order to energize the winding the transformer draws more current leaving voltage behind.

study power factor topic

Hit

hi, all

reversing the phase connection, may cause the transformer lagging.???

If you are referring to the phase shift in a Delta-wye or Wye-delta transformer, it is due to how the windings are connected electrically. See the following articles, and do a Google search on 3-phase transformer windings:

http://ecmweb.com/ops/electric_basics_transformers_2/

http://www.ece.msstate.edu/~donohoe/ece3414three_phase_transformers.pdf

http://www.basler.com/downloads/3phXfmrs.pdf

In an ANSI standard configuration, as is used in most distribution transformers in the US, the secondary phase voltage lags the primary by 30 degrees. However, by swapping two of the primary phase conductors (e.g, H1 and H3) and the SAME TWO secondary conductors (X1 and X3), you end up with 30 degrees leading.

Hi, All

swapping of the phase connection, with cause lagging of 30 degree doesn't matter. the transformer still working.

Regard's