Hello everyone!
How to evaluate CB short circuit rating based on the calculated short circuit current? How many percent must be the calculated fault current compared to CB short circuit rating?
Do you have standard CB short circuit ratings table for ANSI and IEC CB?
Thanks everyone
Hello everyone!
How did ETAP solve the base value on its short circuit report manager?
How can I also solve for the per unit impedance of my transformer if the rating of the transformer is 67kV/13.8kV... my base voltage that I used is 69kV/13.8kV since that is connected in a 69kV/13.8kV...
Hello everyone!
Can I ask what is the meaning of low, medium, and high on the graph of the typical X/R ratio of transformer and induction motor in IEEE standards?
Attached here is the picture of the typical X/R ratio.
Thanks...
Dear Everyone,
The system where I did its short circuit calculation has 72.5kV PCB with 25kA breaking current and 65kA making current with 44% dc component rated in IEC standard which is used in the 69kV line, the 13.8 kV line used 15kV vacuum circuit breaker with rated short circuit current...
Dear All,
If based from ETAP software and manual calculation shows that the single line to ground fault is higher compared to three phase fault what will I used
in the Evaluation of the short circuit rating of breaker.
Thank You.
Dear All,
How can I know the time in milliseconds or the breaker or the time constant, if the breaker has 44% DC component,
25kA breaking current and 65kA making current?
Thank You
Dear Everyone,
The Circuit Breaker nameplate used Standard IEC 62271-100,but sadly I don't have that standard.
I don't know how can I get the minimum time delay of that circuit breaker as well as its X/R test ratio.
I used manual calculation of short circuit calculation. And used ETAP software...
Dear Everyone,
Anyone who knows the minimum time delay and X/R test ratio of ABB 72.5kV SF6 Circuit breaker with 44% DC component, type EDF SK1-1?
It has a standard of IEC 62271-100 in the nameplate.
Thank You
I have a 72.5 kV power circuit breaker with a breaking current of 25 kA and a making current of 65kA with a DC component of 44 percent.
What will I used to evaluate the breaking current rating of CB. The symmetrical breaking current or the asymmetrical breaking current?
How can I know the...
