Variable Speed Drive - Triplen and even harmonic currents - ABB DriveSize Ver5.9

[EddyWirbelstrom]

ABB variable speed drives type ACS580 with front-end uncontrolled 6 pulse rectifier are supplied via Delta-Wye Ground transformers.
The ABB DriveSize Ver 5.9 software reports triplen and even order harmonic currents injected into the system impedance, on both sides of the Delta-Wye Ground transformer.
How can triplen and even order harmonic currents flow in the system imepdance ?

 

[EddyWirbelstrom]

My earlier post incorrectly stated that the ABB DriveSize 5.9 reported triplen and even harmonics.
The attached DriveSize 5.9 report for a 315kW VSD shows insignificant triplen and even harmonics.