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IEVref: | 131-12-78 | ID: | |

Language: | en | Status: Standard | |

Term: | ideal transformer | ||

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Definition: | two-terminal-pair network for which the sum of instantaneous powers at the two-terminal pairs is identically equal to zero and for which the ratio of the input voltage and the output voltage has a constant value K
NOTE 1 – An ideal transformer can be considered as a linear inductive 2-terminal-pair element characterized by a singular inductance matrix. NOTE 2 – For an ideal transformer, the input voltage $\frac{{u}_{1}}{{u}_{2}}=-\frac{{i}_{2}}{{i}_{1}}}=K$ with the usual reference conventions for associated voltages and currents given for two-port networks in IEC 60375:2003, Clause 7. NOTE 3 – Under sinusoidal conditions, the impedance K:
NOTE 4 – An ideal transformer is a circuit element that neither stores nor dissipates energy. The transformer as a device is defined in IEC 60050-151. | ||

Publication date: | 2008-09 | ||

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Internal notes: | 2015-08-20: Tagging of variables corrected to be italic. JGO 2017-06-02: Cleanup - Remove Attached Image 131-12-78en.gif | ||

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$\frac{{u}_{1}}{{u}_{2}}=-\frac{{i}_{2}}{{i}_{1}}}=K$

with the usual reference conventions for associated voltages and currents given for two-port networks in IEC 60375:2003, Clause 7.
__Z___{1} seen at the input port is the product of the terminating impedance * Z* at the output port by the square of the constant

__Z___{1} = *K*^{2}__Z__