Transformers 2

Question 1

What are the 3 voltages of triple ratio transformers

Answer 1

4kV, 6.9kV, 7.2kV

Question 2

What rules must be followed when single phase transformers are paralleled together?

Answer 2

• connect to same primary phase
• y types with y types, delta with delta
• primary voltage setting must be identical

Question 3

When taking a transformer out of service, perform what steps before disconnecting neutrals or grounds?

Answer 3

• de-energize the transformer
• take primary phase tap off the line
• remove secondary taps *first step when disconnecting transformers in parallel