1 / 28

MR type R switch

MR type R switch. 4 resistors. Example Canada 3.4 and 6 Ohms. Phase shifting transformer 840 MVA 240kV. MCa - Main contact (copper) opening. First region. MSCa - Main switching contact opens. Adding resistance – current drops. Second region – subtracting turns.

gail-martin
Download Presentation

MR type R switch

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MR type R switch 4 resistors

  2. Example Canada 3.4 and 6 Ohms Phase shifting transformer 840 MVA 240kV

  3. MCa - Main contact (copper) opening

  4. First region MSCa - Main switching contact opens

  5. Adding resistance – current drops

  6. Second region – subtracting turns TCa2 - Transition contact closes Connecting onto the contact at “potential” and lower resistance

  7. UP

  8. Second region – adding turns Connecting onto the contact with potential at lower resistance

  9. DOWN

  10. Third region

  11. Fourth

  12. Fifth

  13. Recovery

  14. Main contact = b

  15. Influence of L More or less turns Phase shifter

  16. More turns

  17. Less turns 4th segment influenced

  18. OLTC problem ? 890MVA 500kV/25kV Malaysia

  19. Nameplate2 type R OLTCs in parallel

  20. Type R – two resistors sequence

  21. Nameplate Double tap changer windings in parallel Y connected Fine-coarse regulation

  22. Double time on ODD transitions Transition 100mSec

  23. Good time on EVEN transitions Transition 40mSec

  24. Complete test – up and down

  25. Is it because two parallel windings and two parallel OLTCS tested at the same time?

More Related