Transformers Single Phase
An electrician is not expected to know how to construct or repair a
transformer. Our job is to install what we are told to install. Usually the
specifics about a transformer are provided on a blueprint. An electrician may be
expected to evaluate an issue with a transformer. So some familiarity with
terminology and calculations is helpful.
Here are terms associate with transformers:
Line Side - Input - Primary - L1 L2 L3 - Supply Side
Load Side - Output - Secondary - T1 T2 T3 - Use Side
P primary (p) wattage of line side
P secondary (s) wattage of load side
E primary (p) voltage of line side
E secondary (s) voltage of load side
I primary (p) current of the line side
I secondary (s) current of the secondary
N primary (p) number of turns in the primary
N secondary (s) number of turns in the load side
eff efficiency of a transformer
pf power factor of a transformer
ratio comparison of primary to secondary voltages
Here are some of the electrical relationships for single phase transformers
as given in Reference Formulas Appendix:
To insure that you understand the calculator technique for these formulas,
here is a check values chart which you can use to practice with a calculator.
Use the values given in the chart to find other values given in the chart. If
after making the calculation, you get a different answer than in the chart, redo
the calculation until your answer matches the check values.
Find practice problems HERE.
There are several pages available for this topic.
Find audio support HERE.
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