Virtual Labs

Electrical Engineering Virtual Power Lab Experiments

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Theory

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Simulation

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Study of Differential Protection of a Three-Phase Delta-Delta Connected Transformer

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Beginner

Intermediate

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1. Differential protection should be provided in the transformers whose rating:

a: Above 5 MVA Explanation

Explanation

b: Below 5 MVA Explanation

Explanation

c: Above 50 MVA Explanation

Explanation

d: Below 50 MVA Explanation

Explanation

2. The differential protection of transformer does not cover the following fault:

a: Winding to ground fault Explanation

Explanation

b: Winding to winding faults Explanation

Explanation

c: Inter turn fault in any winding Explanation

Explanation

d: Short circuit faults at transformer bushing Explanation

Explanation

3. Which type of connection is employed for current transformers for the protection of Delta-Star connected 3-phase transformer:

a: Delta-Star Explanation

Explanation

b: Star-Delta Explanation

Explanation

c: Delta-Delta Explanation

Explanation

d: Star-Star Explanation

Explanation

4. Which Differential protection principle is used in the protection of transformer:

a: Current difference Explanation

Explanation

b: Voltage difference Explanation

Explanation

c: Power difference Explanation

Explanation

d: Power factor difference Explanation

Explanation

5. In differential protection of transformer the CTs on both side of transformer are:

a: Identically same Explanation

Explanation

b: Their turns ratio has inverse relation Explanation

Explanation

c: Their turns ratio has no relationship Explanation

Explanation

d: None of the above Explanation

Explanation

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