A 2½ Element WYE Configuration uses 3 current phases and 2 voltage phases to calculate what is on the third voltage phase in order to measure the total power on all three phases.
The voltage on all three phases must be closely balanced for the total measurement to be accurate.
Blondel’s theorem does not apply to 2½ Element WYE as it does to 2 Element Delta measurements, so under unbalance conditions, some errors can occur.
This White Paper Includes: