Higher order harmonics during inrush

[bacon4life]

Is it typical for higher harmonics to increase well after transformer energization? The attached file show 3rd and 5th harmonics actually peak after about 2 seconds. This is first time our transient recorder has capture this long of file, so I curious as to whether this is typical.

The bank is 500 MVA 230/115 kV autotransformer. The graph has both the bank neutral and high side phases. The phase harmonics are B phase as it was the largest in magnitude.

 

[bacon4life]

Here is a better copy of the recording. I can't seem to remove the link in the first post though