Open Delta
Open Delta
(OP)
Why does an open delta provide 58% power instead of 2/3 the power of a regular delta?
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RE: Open Delta
Mike
RE: Open Delta
I-phase = I-line
V-phase = V-line
For regular delta:
1.73*I-phase = I-line
V-phase = V-line
Is this correct?
RE: Open Delta
When used in Open Delta, the transformers must be derated 86.6% to avoid overloading. After you have derated the transformers 86.6% you multiply by 2/3.
Look at it another way;
One 33 Kva transformer = 33 KVA
Two 33 1/3 Kva transformers, derated for open delta service.
66 2/3 Kva x 86.6% = 57.7 Kva
Three 33 1/3 Kva transformers = 100 Kva.
RE: Open Delta
a) Two transformer (Open Delta): PV=√3Elinex Iline/√3 = Elinex Iline.
b) Three transformer (Closed Delta): PΔ=√3Elinex Iline .
PV/ PΔ= 1/√3= 57.7%
RE: Open Delta
RE: Open Delta
Mike