transformer no-load current test

we have 4 nos 100MVA transformer at 220/34.5 kv rating, ynd1 group.

as per GTP drg current is 0.5A at no-load when we applied at rated voltage level.

but in site testing we applied only 415v at primary side i.e 220kv side. what will be the no-load current at that time?

regards