High Leg Delta Power Measurement

[lj]

I need to measure the total load (kW) on the secondary of a delta-connected 240V (high leg) transformer. It seems to me that four currents and four voltages need to be measured - one for each "240V" leg and one for the "120V" leg. Does this sound right? If so, how is this done with a standard three-phase power meter that has only three current loops and three voltage leads (plus ground)? Thanks.

 

[Strife]

You only need to measure the three phases (240 legs). The neutral only carries the unbalanced current of the three legs (which is already in the the three legs measurement). Unless I'm missing something.

I need to measure the total load (kW) on the secondary of a delta-connected 240V (high leg) transformer. It seems to me that four currents and four voltages need to be measured - one for each "240V" leg and one for the "120V" leg. Does this sound right? If so, how is this done with a standard three-phase power meter that has only three current loops and three voltage leads (plus ground)? Thanks.