Transformer protection and testing procedures Quiz…

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

Overcurrent relays — Overcurrent relays are designed to trip when current exceeds a predetermined value, protecting against overload or faults.

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

Detecting internal faults like insulation breakdown or arcing — The Buchholz relay detects gas accumulation or oil surge inside the transformer tank, indicating internal faults.

Q: Which test is commonly performed on transformer oil to assess its insulating properties?

Dielectric strength test — Dielectric strength test measures the voltage the oil can withstand before breakdown, crucial for insulation integrity.

Q: What is the purpose of a turns ratio test on a transformer?

To verify the number of turns in primary and secondary windings — The turns ratio test verifies that the ratio of primary to secondary turns is as specified, ensuring correct voltage transformation.

Q: Which of the following is a key safety measure during transformer maintenance and testing?

Earthing and short-circuiting both high and low voltage windings before any work. — Earthing and shorting both HV and LV windings ensures the transformer is completely discharged and safe before work begins, protecting personnel.

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 predetermined value, protecting against overload or faults.

Question 2 of 5

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

The Buchholz relay detects gas accumulation or oil surge inside the transformer tank, indicating internal faults.

Question 3 of 5

Which test is commonly performed on transformer oil to assess its insulating properties?

Dielectric strength test measures the voltage the oil can withstand before breakdown, crucial for insulation integrity.

Question 4 of 5

What is the purpose of a turns ratio test on a transformer?

The turns ratio test verifies that the ratio of primary to secondary turns is as specified, ensuring correct voltage transformation.

Question 5 of 5

Which of the following is a key safety measure during transformer maintenance and testing?

Earthing and shorting both HV and LV windings ensures the transformer is completely discharged and safe before work begins, protecting personnel.

Transformer protection and testing procedures Quiz