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Power Transformer

MacIntyre

Could a 400/33kV 120MVA power transformer with a YNyn0 vector group be applicable to a renewable generation project as the main transformer?

Im concerned that the vector group is a star-star winding that could cause zero sequence impedance, unbalanced loads and Harmonics issues. Could any of the potential issued be mitigated by introducing an NER or Earthing Transformer?

Parents
  • 0

    Yes  the energy park will be the 33kV side and will step up to 400kV for connection to the transmission system. 

    1) The Neutrals will be Solidly grounded, built to IEC 60076 / IS 2026.

    2) The wind turbine rectifies the wave to 50Hz sin wave. There may be an opportunity to introduce reactive compensation and a harmonic connection at 33kV. Further system studies would need to be undertaken.

  • 0 in reply to MacIntyre

    will step up to 400kV for connection to the transmission system

    That feels rather unusual. I thought that very little got direct connections to the supergrid in the UK - is this a massive project? or outside of the UK?

    Most of the stuff around here gets connected to the 11kV distribution system.

       - Andy.

Reply
  • 0 in reply to MacIntyre

    will step up to 400kV for connection to the transmission system

    That feels rather unusual. I thought that very little got direct connections to the supergrid in the UK - is this a massive project? or outside of the UK?

    Most of the stuff around here gets connected to the 11kV distribution system.

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Renewable energy projects connecting to 132kV and above are common. Stepping from 33kV to 400kV is not so common but it still works. 

    The project is above 100MW connecting into NGET so not huge in today's terms. 

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