Phasing in Transformer

Chapter 9.4 Phasing

Lessons In Electric Circuits Volume II – AC Book
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Lessons In Electric Circuits Volume II – AC Book

  • 9.4.PHASING237Figure 9.22: Isolation transformer isolates power out from the power line.9.4PhasingSince transformers are essentially AC devices, we need to be aware of the phase relationships be-tween the primary and secondary circuits. Using our SPICE example from before, we can plot thewaveshapes (Figure 247,9.23) for the primary and secondary circuits and see the phase relations forourselves:spice transient analysis file for use with nutmeg:transformerv1 1 0 sin(0 15 60 0 0)rbogus1 1 2 1e-12v2 5 0 dc 250l1 2 0 10000l2 3 5 100k l1 l2 0.999vi1 3 4 ac 0rload 4 5 1k.tran 0.5m 17m.endnutmeg commands:setplot tran1plot v(2) v(3,5)In going from primary, V(2), to secondary, V(3,5), the voltage was stepped down by a factor often, (Figure 247,9.23) , and the current was stepped up by a factor of 10. (Figure 247,9.24) Both current(Figure 247,9.24) and voltage (Figure 247,9.23) waveforms are in-phase in going from primary to secondary.