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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.

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MR type R switch

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  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?

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