IEC 60909 Transformer Impedance Correction Factor
IEC 60909 Transformer Impedance Correction Factor
(OP)
Hi, I was wondering what reason is behind IEC 60909's transformer impedance correction factor. Is this replace transformer impedance tolerance, or should they both be applied?






RE: IEC 60909 Transformer Impedance Correction Factor
The same form of formula for both transformer and generator suggests that the power factor before the fault influences the impedance.
Flux before and after fault ?
Can anyone comment ?
RE: IEC 60909 Transformer Impedance Correction Factor
In the older versions of IEC 60909 (pre-2001), there was no explicit impedance correction factor for transformers, instead just a suggestion that considerations need to be made. IEC found this unsatisfactory and introduced the correction factor in the 2001 edition. The correction factor was essentially defined empirically through an statistical analysis of a few hundred transformers. Most of this is described in some detail in IEC 60909-1.
RE: IEC 60909 Transformer Impedance Correction Factor
RE: IEC 60909 Transformer Impedance Correction Factor
RE: IEC 60909 Transformer Impedance Correction Factor