malachi constant
Senior Member
- Location
- Minneapolis
Utility gives me the following information for their service transformer:
kVA: 500
%R: 1
%X: 1.5
%Z: 1.8
Fault Current 120/208V Secondary: 77,100
The fault current prorgam I am using allows the following inputs:
* Three Phase Amps
* Line to Ground Amps
* Three Phase X/R (defaults at 8.0)
* Line to Ground X/R (defaults at 8.0)
My questions:
1. In the absence of information should I assume 3P and L-G amps are both 77100?
2. Can I plug 1.5 in for the X/R ratio?
I'm pretty sure 1.5 X/R ratio is OK to plug in. But the utility never provided %X or %R before, and I've been using the default for so long I'm hesitant to make any changes to how I do the study before bouncing it off some peers.
kVA: 500
%R: 1
%X: 1.5
%Z: 1.8
Fault Current 120/208V Secondary: 77,100
The fault current prorgam I am using allows the following inputs:
* Three Phase Amps
* Line to Ground Amps
* Three Phase X/R (defaults at 8.0)
* Line to Ground X/R (defaults at 8.0)
My questions:
1. In the absence of information should I assume 3P and L-G amps are both 77100?
2. Can I plug 1.5 in for the X/R ratio?
I'm pretty sure 1.5 X/R ratio is OK to plug in. But the utility never provided %X or %R before, and I've been using the default for so long I'm hesitant to make any changes to how I do the study before bouncing it off some peers.
