Transformer PROTECTION

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# Transformer PROTECTION - PowerPoint PPT Presentation

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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Presentation Transcript
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