Prot123
Electrical
- Jul 25, 2018
- 43
Hi All,
I have a question about fault current behaviour in a ZNyn1 (22kV/0.440kV) transformer, which is being used as an earthing and auxiliary transformer.
For a line-to-ground (LG) fault on the LV (yn) side, my calculations show a very low fault current, which seems to align with standard guidelines and references (e.g., JP Transformer Handbook). However, I want to double-check a few things:
Any input is highly appreciated. Thanks
I have a question about fault current behaviour in a ZNyn1 (22kV/0.440kV) transformer, which is being used as an earthing and auxiliary transformer.
For a line-to-ground (LG) fault on the LV (yn) side, my calculations show a very low fault current, which seems to align with standard guidelines and references (e.g., JP Transformer Handbook). However, I want to double-check a few things:
- Is this expected, or am I missing something?
- Does the zero-sequence balancing flux flow through the transformer tank on the yn side?
- Would a buried delta winding help reduce zero-sequence impedance?
- Zero sequence impedance is 20ohm/phase.
- The Y side is solidly grounded.
Any input is highly appreciated. Thanks
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