Impedance conversion

ccording to energy transfer between the same, before and after conversion to know the active and reactive power are constant:
; Similarly,
Be seen that the secondary side of each physical quantity when converted to the primary side is to:
Current divided by the transformation ratio; voltage (potential) multiplied by the transformation ratio; resistance, reactance, impedance transformation ratio multiplied by the square.
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After conversion, see top right of transformer equations
1.3.4 phase diagram
After taking the secondary voltage conversion for the reference   phasor.
Steps: lag angle, 90 degrees ahead of it
Angle iron loss ahead of α,
4 transformer equivalent circuit
Equivalent circuit can be expressed by the basic equation of the electromagnetic circuit in the form of relationship with that out of the "field into the road" to analyze, the "field of the Road" is the study of the basic theory of transformers and electrical methods.
1.4.1 T-type equivalent circuit
According to equation after conversion, the transformer T type equivalent circuit can be obtained.
1.4.2 Γ-type equivalent circuit similar
In fact, the excitation is much greater than the leakage impedance Zm impedance Z1, the leakage impedance of a small pressure drop. Basis, so that the excitation at both ends of the slip road to the power forward in parallel, making the analysis and calculation simplified.
1.4.3 The simplified equivalent circuit
Conditions: When the transformer or transformer short-circuit load current large run-time, you can ignore the small field current disconnect.