triden55
Electrical
- May 17, 2012
- 12
Hello,
I just created a star coordination in ETAP, but it seems that all displayed values are being transformed through my transformer turns ratio.
The simulation is very simple: 25kv overhead electrical service into a 25kv/600v 1000kVA transformer with primary fusing. On the secondary there is a 1200a CB feeding an MCC.
When I generate my star diagram, my current values in the plot labels for the transformer and anything downstream seem to be inflated by about 41 times (transformer turns ratio). Is there any way to fix this so that my coordination devices reference primary current instead?
The image below should show you what I mean. For instance, my transformer inrush is displayed at 8xFLA which should be 23x8=184amps, but it shows 7698 amps. Same with Primary FLA and the MCC pickup current.
I just created a star coordination in ETAP, but it seems that all displayed values are being transformed through my transformer turns ratio.
The simulation is very simple: 25kv overhead electrical service into a 25kv/600v 1000kVA transformer with primary fusing. On the secondary there is a 1200a CB feeding an MCC.
When I generate my star diagram, my current values in the plot labels for the transformer and anything downstream seem to be inflated by about 41 times (transformer turns ratio). Is there any way to fix this so that my coordination devices reference primary current instead?
The image below should show you what I mean. For instance, my transformer inrush is displayed at 8xFLA which should be 23x8=184amps, but it shows 7698 amps. Same with Primary FLA and the MCC pickup current.
