Run/Update short circuit current-ETAP
Run/Update short circuit current-ETAP
(OP)
Dear Folks,
Greetings...
In a small Isolated network with two generators are connected to a bus directly (without transformers) and operating in parallel. Each generator's ground (Earth) fault current is limited to 100A due to neutral ground resistor. Each generator has a neutral CT and connected to sensitive Earth fault relay. During update TCC clipping current in ETAP, the ground fault current in each generator neutral circuit is showing 200A rather 100A as shown in the attachment.
Please suggest me that how to update with 100A (calculated)as clipping current. Thank you so much...
Greetings...
In a small Isolated network with two generators are connected to a bus directly (without transformers) and operating in parallel. Each generator's ground (Earth) fault current is limited to 100A due to neutral ground resistor. Each generator has a neutral CT and connected to sensitive Earth fault relay. During update TCC clipping current in ETAP, the ground fault current in each generator neutral circuit is showing 200A rather 100A as shown in the attachment.
Please suggest me that how to update with 100A (calculated)as clipping current. Thank you so much...






RE: Run/Update short circuit current-ETAP
RE: Run/Update short circuit current-ETAP
RE: Run/Update short circuit current-ETAP
RE: Run/Update short circuit current-ETAP
Neutral Resistance: 19.0526 Ohms
Ground fault current:100A (through each neutral circuit)
If two units are in operations, total ground fault current: 200A, however the ground fault current in each neutral circuit is 100A
RE: Run/Update short circuit current-ETAP
RE: Run/Update short circuit current-ETAP
Modeling the GF relay and (zero sequence) CT on the gen connection to the bus provides the same value. As a matter of fact, it shows the total bus 3-phase fault current as well, not just the contribution from the one gen.
You may want to ask ETAP about it, as suggested.
You can always put in the User Defined value instead of Calculated to get 100A in the TCC graph.
RE: Run/Update short circuit current-ETAP