Question 1 of 10
Which of the following is NOT a common type of transformer fault?
Capacitor bank failure is not a primary transformer fault type, though it can indirectly impact transformer operation. The other options are directly related to transformer component failures.
Question 2 of 10
What is the primary function of transformer oil in a power transformer?
Transformer oil primarily insulates the windings and other internal components. While it also aids in cooling, its insulation property is the most critical function.
Question 3 of 10
What does a reduction in transformer oil dielectric strength indicate?
A decrease in dielectric strength suggests the oil's ability to insulate is compromised, often due to contamination or degradation.
Question 4 of 10
What is the function of a Buchholz relay?
The Buchholz relay is a protective device that detects faults inside an oil-filled transformer by sensing the gases and oil flow generated by these faults.
Question 5 of 10
What protection method is based on Kirchhoff's current law?
Differential protection compares incoming and outgoing currents, relying on Kirchhoff's current law to detect imbalances that indicate a fault within the transformer.
Question 6 of 10
What type of protection is commonly used on MV transformers up to 2.5 MVA?
Over-current relays are a common and cost-effective protection method for smaller and medium-voltage transformers.
Question 7 of 10
Which component is NOT a part of built-on protection for oil-filled transformers with a conservator?
Over-current relays are an additional protection method and are not considered part of the built-in protection. They are a separate protection system.
Question 8 of 10
What is a key function of fuses used for transformer protection?
Fuses are designed to open the switch-disconnector, preventing the transformer from operating when a fault causes the fuse to blow.
Question 9 of 10
What is the consequence of a major fault in a transformer?
Major faults cause a quick and significant release of gases and oil vapor, leading to pressure buildup and potential damage.
Question 10 of 10
What can cause winding insulation faults in a transformer?
Winding insulation faults can be caused by the failure of oil or the breakdown of the winding insulation, including external impacts.
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