Transformer X/R Ratio
Transformer X/R Ratio
(OP)
Dear Friends,
I need to specify X/R ration of a transformer and for this I am using C37.010-1979 Sec.5.4.1
However this chart does not represent the exact values of the transformer X/R as I have to guess (For example 1.5MVA XFR. whats X/R ratio)
Does anybody have an Excell spread sheets with these values ?
Thanks
I need to specify X/R ration of a transformer and for this I am using C37.010-1979 Sec.5.4.1
However this chart does not represent the exact values of the transformer X/R as I have to guess (For example 1.5MVA XFR. whats X/R ratio)
Does anybody have an Excell spread sheets with these values ?
Thanks






RE: Transformer X/R Ratio
Typically, this is a tested, or at worst, estimated value.
RE: Transformer X/R Ratio
I have seen some accurate numbers like 8.32
How can somebody estimate this accurately.
Is there a formula to calculet this?
RE: Transformer X/R Ratio
Estimates can be made, such as Table 1 in the IEEE 242 (Buff) book. For a 1.5MVA, 3-phase transformer, primary volatge up to 15kV and secondary voltage 600V or less, X/R is listed as 7.0.
RE: Transformer X/R Ratio
But just because someone uses three significant figures doesn't prove they know the answer to that accuracy.