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OLTC Failure

OLTC Failure. 45MVA 132kV. Manufacturer Takaoka Japan. 16 positions No change-over switch. Linear design of tap winding. Bucholz tripped the unit. OLTC oil sample. Bucholz relay oil sample. Phase U. Even positions higher resistance. Odd and Even contacts. Burned contacts.

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OLTC Failure

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  1. OLTC Failure 45MVA 132kV

  2. ManufacturerTakaoka Japan 16 positions No change-over switch Linear design of tap winding

  3. Bucholz tripped the unit OLTC oil sample Bucholz relay oil sample

  4. Phase U Even positions higher resistance

  5. Odd and Even contacts

  6. Burned contacts

  7. Phase V is good

  8. Zoom in one transition

  9. But diverter switch contacts rough

  10. Phase W PROBLEM

  11. Transition – opens the circuit

  12. Second resistor opens

  13. 1 A

  14. INVESTIGATION

  15. Diverter design

  16. One phase does not make

  17. Principle of operation

  18. Transition resistors

  19. After repair

  20. Going UP

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