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Recent content by odlanor

  1. odlanor

    Parallel Generator Grounding

    Option 1- No good! You will increase potential ground , reducing personal security Option 2- Good!Add in a high resistance ground (<10A) at the generator frame.
  2. odlanor

    YnDyn0 vs Dzno, advantages and disadvantages

    subtransmission utilities in Brazil use 69kV supplied by source in delta grounded by zigzag grounding transformer step down transformer are 230/69kV or 138/69kV YNd
  3. odlanor

    YnDyn0 vs Dzno, advantages and disadvantages

    I guess less expensive will be Ynd11 with zig-zag grounding transformer.
  4. odlanor

    Vector Group

    attached assistance to set transformer protectionhttp://files.engineering.com/getfile.aspx?folder=e35b0af0-3e41-464c-aab8-24e5f9ef26a9&file=Yd5.png
  5. odlanor

    Vector Group

    Marmite, below my interpretation of your post for setting relay Siemens Transformer Relay Parametrization (extract): 270 Rated Frequency 60 Hz 271 Phase Sequence L3 L2 L1 313 Starpoint of Side 1 is Earthed 314 Transf. Winding Connection Side 1 Y (Wye) 323 Starpoint of Side 2...
  6. odlanor

    Vector Group

    Marmite: "You would need to check the LV connections as well. If A&C are crossed on the secondary the same as they are on the primary then your transformer will act as a Yd7. If not then you are just changing the phase rotation." LiteYear: "crossing A & C on the primary of a Yd5 will, provided...
  7. odlanor

    Current Differential Vs Distance relay

    Sorry for my ignorance. What do you mean: Check the OP?
  8. odlanor

    Current Differential Vs Distance relay

    current differential scheme is a unit-protection. distance relaying needs telecommunication to be a unit-protection. I did not understand David post.
  9. odlanor

    500 kV GIS type tested @ 60 Hz

    I had experience with circuit breaker SF6-50 Hz 230kV replacing 230kV breaker SF6-60 Hz. The only type test that it is not tended refers to maneuvers with capacitive loads.
  10. odlanor

    Generator Breaker

    DTR2011, This protection do not close or avoid close breaker; it opens breaker after wrong synchronization.
  11. odlanor

    Generator Breaker

    -Dedicated protection against wrong synchronization Despite all the prevention measures used in synchronization circuit: synchronism check, synchroscopy, automatic synchronizer, dead-line bar alive, etc, the synchronization information wrong that occurred in Brazilian plants reached the level of...
  12. odlanor

    Generator Breaker

    guys, you’re right! I wanted to summarize the introduction but I ended up writing nonsense! Forget my comment. I guess there is a thread about this logic diagram; I posted to show Shlim another protection relay. I just wanted to introduce a protection against wrong, poor, bad synchronization in...
  13. odlanor

    Optimal Insulator Design for Hight altitude power line

    Once I participated in a project of 230kV outdoor substation, we change it to 345 kV outdoor substation because high altitude region. Finally we discover utility only used indoor 230 kV SF6 substation. The priority is to discover the BIL used by utilities of high altitude region.
  14. odlanor

    Optimal Insulator Design for Hight altitude power line

    miltonboss, the reference is classical book of Insulation Coordination!!! ?????
  15. odlanor

    Generator Breaker

    ERRATA There is no protection relay specific to prevent the breaker from closing, because you have to close breaker to detect the synchronization criteria not satisfied for good synchronization. We have a dedicated very fast and selective protection for wrong synchronization occurred after...
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