December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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143Transformer
5.12 CONTINUOUS EQUIVALENT CIRCUIT
THROUGH TRANSFORMER
Consider a 480-120 V, single-phase transformer connected to load impedance Z
Load
ohms via secondary side cable impedance Z
LVcable
ohms and primary side cable
impedance Z
HVcable
ohms, all connecting to the source as shown in Figure 5.9a. We
can reduce this circuit into a continuous circuit with one total impedance powered
directly from the HV side source as follows.
The equivalent ohm values of Z
Load
and Z
LVcable
looking from the source side
get transformed by n
2
, that is, the voltage ratio squared. The ohm value of Z
HVcable
remains the same as given; it does not get transf ...
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