IEVref: 131-12-78 ID: Language: en Status: Standard Term: ideal transformer Synonym1: Synonym2: Synonym3: Symbol: 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 u1, the output voltage u2, the input current i1 and the output current i2 are related by the formula: $\frac{{u}_{1}}{{u}_{2}}=-\frac{{i}_{2}}{{i}_{1}}=K$ 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 Z1 seen at the input port is the product of the terminating impedance Z at the output port by the square of the constant K: Z1 = K2Z 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 Source: Replaces: Internal notes: 2015-08-20: Tagging of variables corrected to be italic. JGO 2017-06-02: Cleanup - Remove Attached Image 131-12-78en.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: