Magnetising current
Magnetising current
Power will be consumed by the TX as magnetising current. because of the change of flux because of the 50 or 60 Hz frequency.
Depending upon the size of the TX it will vary.
For a small 30 VA TX, this magnetising current is around 80 mA's for a 230V 50 Hz TX.
Copperlosses, are only of significance if the TX is loaded, these do increase with load.
Ironlosses, are losses within the laminated iron pack and normally steady and added as part of magnetising losses.