Transformers
Connections
Connections
This connection needs help?
What is Delta?
This bank has high leg.
120/240 has a high leg
delta connection on secondary
What is another name for a hot leg?
All legs are hot.
How do I get extra credit on my transformers test?
Perfect Bank
Lable either Series or Parallel
Perfect Vectors
CSP transformers have a trip handle or switch on the side of the transformer. This is considered a visual open point. T/F
False
Each transformer stands alone.
What is Wye?
What voltages are possible with a wye
connection on the secondary?
120/208v
277/480v
Another name for Vectors
What are Phasors?
Three 50kva transformers is equal to.
150kva or 150,000w
All cutout fuses are the same, just made by different manufactures. T/F
False. Some melt slow and some melt fast or quick
What kind of bank has a lighting and power transformer? wye or delta
Delta
Voltage that most customers require
What is 120/240?
Best place to live in Florida?
What is Lakeland?
How do you find the high leg voltage?
Multiple the phase to neutral voltage by 1.732
Who requires ground rods to be at least 8'
What is NESC?
Delta system requires 1 phase to energize the transformer: T/F
False - it requires 2 phases
You should ground both transformers x2 bushings on an open bank. T/F
False
____ volt transformers will have only 2
secondary bushings
What is 277volt?
How do you check phase to ground voltage on a delta (primary) system?
You can't. You can only check phase to phase.
You should always jerk transformers around by the bushings. T/F
False. This will most likely damage the transformer
You should always make these connections first and disconnect these connections last.
What are ground/neutral connections?
Closed Bank:
What must be done to the transformers to get
120/208?
Change transformer leads internally:
From A CB D to AC BD
What is Cuz's real name?
What is Larry?
What is the purpose of the oil in the transformer?
Cooling and Insulating.
The entire load never being on at the same time.
What is diversity factor?