Star Connected VTs

[Cerkit]

Hi,

If there are three VTs connected in star configuration, with 100VA burden unity pf across A-B and 100VA burden unity pf across B-C, and no burden across C-A.

How can I calculate the burden on each phase?

Thanks

 

[davidbeach]

Vectorial summation on the burdens on each phase.

 

[Cerkit]

Hi,

I get
Phase A 100/√3VA (30° leading)
Phase B 100VA upf
Phase C 100/√3VA (30° lagging)

Is that correct?

Thanks

 

[davidbeach]

A strong possibility. A quick check seems to show 200W and 0Var; an essential outcome. Your own math is always a better solution than some random number from the internet.