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Grounding ZNzn transformers in ETAP

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!

RE: Grounding ZNzn transformers in ETAP

Since the zigzag transformer isn't available in ETAP, you could simulate with a Ygd.  Left the secondary not connected.  A Ygy will not act as a grounding transformer.

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

(OP)
busted! I googled for "Zig-Zag transformers" only :p thanks a lot!

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