Transformer protection and tyesting procedures Quiz…

Q: Which protection device is primarily used to detect overcurrent conditions in a transformer?

Overcurrent relay — Overcurrent relays are designed to trip when current exceeds a set limit, protecting against overload.

Q: What is the primary function of a Buchholz relay in a transformer?

To detect internal faults by sensing gas accumulation and oil surge — Buchholz relays are gas-actuated relays that detect internal faults by sensing gas and oil surges.

Q: Which of the following tests is NOT typically performed on a transformer?

Temperature test of the external surface — While surface temperature is monitored, it is not a core standard test like insulation resistance.

Q: What does the 'turns ratio test' measure in a transformer?

The ratio of primary and secondary winding turns — The turns ratio test verifies that the actual turns ratio matches the nameplate rating.

Q: Which protection scheme is commonly used to protect a transformer against internal faults like winding-to-winding shorts?

Differential protection — Differential protection compares primary and secondary currents to detect internal faults within the transformer.

Question 1 of 5

Which protection device is primarily used to detect overcurrent conditions in a transformer?

Overcurrent relays are designed to trip when current exceeds a set limit, protecting against overload.

Question 2 of 5

What is the primary function of a Buchholz relay in a transformer?

Buchholz relays are gas-actuated relays that detect internal faults by sensing gas and oil surges.

Question 3 of 5

Which of the following tests is NOT typically performed on a transformer?

While surface temperature is monitored, it is not a core standard test like insulation resistance.

Question 4 of 5

What does the 'turns ratio test' measure in a transformer?

The turns ratio test verifies that the actual turns ratio matches the nameplate rating.

Question 5 of 5

Which protection scheme is commonly used to protect a transformer against internal faults like winding-to-winding shorts?

Differential protection compares primary and secondary currents to detect internal faults within the transformer.

Transformer protection and tyesting procedures Quiz