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

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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