EddyWirbelstrom
Electrical
- Feb 17, 2002
- 215
For both transformers and synchronous generators,IEC60909-0 specifies an impedance correction factor proportional to 1 / ( 1 + x * sin pre-fault powerfactor angle ).
Where x = per-unit reactance of transformer and x"d for generator.
For generators I already calculate the subtransient voltage E" = (((V+x"d*I*sin(load pf angle ))^2+(x"d*I*cos(load pf angle))^2)^0.5
Why introduce the IEC60909-0 transformer impedance correction factor ?
Why is the IEC60909-0 transformer impedance factor required ?
Where x = per-unit reactance of transformer and x"d for generator.
For generators I already calculate the subtransient voltage E" = (((V+x"d*I*sin(load pf angle ))^2+(x"d*I*cos(load pf angle))^2)^0.5
Why introduce the IEC60909-0 transformer impedance correction factor ?
Why is the IEC60909-0 transformer impedance factor required ?