Grounding ZNzn transformers in ETAP
Grounding ZNzn transformers in ETAP
(OP)
Hi everyone, I'm sorry if this question is already answered, but I didn't find it.
I have a 132kV system, a 132/13.8kV YNd transformer and a Znzn transformer to provide neutral on 13.2kV system. I need to calculate LG short circuit current, so I'm using ETAP.
I don't know how to simulate the ZNzn transformer. I've tried with a YNyn connected to the 13.2kV, but current still in 0 kA (I don't figure out where to connect the secondary winding).
I've attached a snapshot to clarify.
Any tip?
Thank you very much in advance!
I have a 132kV system, a 132/13.8kV YNd transformer and a Znzn transformer to provide neutral on 13.2kV system. I need to calculate LG short circuit current, so I'm using ETAP.
I don't know how to simulate the ZNzn transformer. I've tried with a YNyn connected to the 13.2kV, but current still in 0 kA (I don't figure out where to connect the secondary winding).
I've attached a snapshot to clarify.
Any tip?
Thank you very much in advance!






RE: Grounding ZNzn transformers in ETAP
The zero sequence impedance (Z0) of the Ygd transformer must be the same as the zigzag transformer. Since it is in % of the transformer rating, you must convert it in ohms because usually Zigzag grounding transformer have Z0 specify in ohms.
RE: Grounding ZNzn transformers in ETAP
http
Rafiq Bulsara
http://www.srengineersct.com
RE: Grounding ZNzn transformers in ETAP