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ASEA Model UZBLN 250/300

ASEA Model UZBLN 250/300. 3MVA trafo, 44kV tap changer UZB , One resistor – asymmetrical L – Linear regulation N- at neutral 250kV impulse 300A rated. Asymmetrical pennant. Raising the voltage = up. Lowering the voltage = down. Linear regulation.

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ASEA Model UZBLN 250/300

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  1. ASEAModel UZBLN 250/300 3MVA trafo, 44kV tap changer UZB , One resistor – asymmetrical L – Linear regulationN- at neutral 250kV impulse 300A rated

  2. Asymmetrical pennant

  3. Raising the voltage = up

  4. Lowering the voltage = down

  5. Linear regulation Linear = adding the turns or subtracting the turns • for DC testing this is important, because : • Raising voltage • when subtracting turns, you are switching onto position with voltage but lower resistance (due to the voltage drop) and current is higher each position (UP) • Peak up - current jumps, when connecting to the point with voltage

  6. Lowering - DOWN • Lowering voltage • when adding turns, you switch onto the position without voltage but higher resistance, and the current is lower each position (DOWN) • Peak down - current drops • when connecting with point without voltage

  7. Peak-up : going up T breaks S makes T makes

  8. up T breaks S makes T makes

  9. up T breaks S makes T makes

  10. up T breaks S makes T makes

  11. Peak-down : going down T breaks T makes S breaks

  12. down T breaks T makes S breaks

  13. down T breaks T makes S breaks

  14. down T breaks T makes S breaks

  15. Photos found on theinternet

  16. Before repair

  17. After repair

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