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Recent content by Robert2025

  1. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    Could you please have a look into SLD I sent.
  2. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    SLD attached. @Masius , @waross , @Kiribanda please comment.
  3. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    @Masius : It is not exactly what I wanted to post here. Thank you! At delta side I have a 33 kv switchgear and one of the outgoing feeder is connected to a Zigzag - Aux transformer. The Zigzag-Aux transformer in my project is 50kVA. How much have you limited L-G fault by use of Zigzag Tr and NGR?
  4. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    @Kiribanda : Thanks for the inputs. We need LV supply and therefore we would like to have a mix of earning and auxiliary transformer at least 50 KVA 33/0,4 ZNyn. From an old zigzag earthing transformer, i found ghe short circuit impedance Zk% is around 5% and zero sequence is 110/phase. Without...
  5. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    @waross: Thank you for your quick feedback. Customer has chosen a NGR with 220ohm 105A-10s, To what current should i limit the ground fault?
  6. R

    Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer.

    I am currently working on a 33 kV distribution system, and i must design a Zigzag earthig transformer+ NGR on the secondary side of a 132/33 kV Yd transformer. I need a sample calculation file. If you have any sample files available, I would greatly appreciate it if you could share one with me.
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