Transformer PROTECTION - PowerPoint PPT Presentation

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Transformer PROTECTION
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Transformer PROTECTION

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  1. Transformer PROTECTION

  2. 7.4. Differential Relays Figure 10: Differential protection for a generator phase winding.

  3. Transformer Protection • Problem 1: For a 45 MVA, 11 kV/66 kV, Y-∆ transformer design a percentage differential scheme. Use 125% overloading to find CT ratios. • What is the minmumrecommended percentage bias?

  4. Transformer Protection Example

  5. Magnetizing Inrush

  6. Harmonic Restraint • Flow Chart

  7. Percentage Bias Differential Relay with Harmonic Restraint

  8. Inter-turn Faults in Transformers

  9. Volts/Hertz Relay Characteristics

  10. Protection During an Earth Fault

  11. Condition for a fault in middle of phase C on 13.2 kV Side

  12. Problem 2:Connection Diagram

  13. Differential Protection for a Generator Connected in Star with four terminals