A 150kVA will give you 416 Amps of 208Y/120, but Mort is looking for 230/3 phase, which is a different animal altogether than the Wye connection we're all familiar with.
He's also going to have a separate zig-zag transformer in order to get a working Neutral, since a Delta connection on a 230/3 phase system is limited to not more than 5% of the transformer rating available for phase-to-neutral loads.
