How are the calculations done in a digital power meter to calculate a delta connected load?

I know for a wye connected load there is a CT and PT on each phase as well as a PT lead on ground/neutral and it simply takes the L-N voltage on one phase multiples it by the current on each phase and then adds up the three phases for the total cpower (assuming pf is 1 here)

For a delta connected load however does the powermeter somehow use the L-L voltages since there really isn't a L-N voltage on a delta system? Or is a L-N voltage on each phase calculated from each L-L voltage and the calcualted L-N voltage used in the calculation?

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