Traffos

Question 1

Bucholtz Relay safety features

Answer 1

• Upper tilt switch (triggers alarm for oil replacement or filtration)
• Lower tilt switch (Disconnects transformer due to dangerously low oil levels. Either caused from oil leaks or internal insulation breakdown)

Question 2

3 methods to cool oil filled power transformers

Answer 2

• Natural ventilation (cooling fins)
• Forced ventilation (fans)
• water cooling

Question 3

What is voltage regulation of a transformer?

Answer 3

The difference between no-load and full-load voltage

Question 4

Formula for Copper losses (Pc)

Answer 4

Copper losses = (Actual load/full load)^2 X full load copper losses

Question 5

What the value of copper losses on half load?

Answer 5

0.25 of copper losses on full load