leakage reactance

leakage reactance

[′lēk·ij rē¦ak·təns]
(electromagnetism)
Inductive reactance due to leakage flux that links only the primary winding of a transformer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Figure 4 shows the schematics of an equivalent circuit with six circuit parameters, including stator winding resistance [R.sub.1], rotor winding resistance [R.sub.2], stator leakage reactance [X.sub.1], rotor leakage reactance [X.sub.2], magnetizing reactance [X.sub.m], and core loss resistance [R.sub.c].
Estimated Equivalent Circuit Parameters Parameter Value, ohms Stator winding resistance 0.276 Stator leakage reactance 1.56 Magnetizing reactance 21.9 Core loss resistance 722 Rotor winding resistance 0.207 Rotor leakage reactance 1.05 Table 3.
The transformer model therefore can be represented by the leakage reactance Xeq only.
Another interesting quality of this measurement system is the possibility to perform on-line measurement of the stator leakage reactance. This is performed by measuring the angle [beta] which is an angle between the terminal voltage phasor U and the air-gap induced voltage phasor E (Fig.
Similar approaches for the measurement of the armature leakage reactance can be found in [21].
The topics include magnetism and related core issues, reactance and leakage reactance calculations, fault current analysis, the multi-terminal three-phase transformer model, mechanical design, capacitance calculations, losses, and load tap changers.
Tolerance power mismatch =0.001 Line Line in Km 4-5 500 4-6 600 5-7 300 7-8 250 8-9 250 9-6 200 Transformer Leakage reactance (p.u) 1-4 0.01 2-7 0.02 3-9 0.015 References
Figure 1 shows the schematics of an equivalent circuit with six circuit parameters, including stator winding resistance [R.sub.1], rotor winding resistance [R.sub.2], stator leakage reactance [X.sub.1], rotor leakage reactance [X.sub.2], magnetizing reactance [X.sub.m], and core loss resistance [R.sub.c].
The measurements enable to approximate computation of the sum of the magnetizing reactance [X.sub.M] and the stator leakage reactance [X.sub.l] as follows [3]:
A method called ORMEL96 uses the motor's nameplate data as well as statistical data, including assumed stator and rotor leakage reactance ratio, stray load loss, friction and windage losses, locked rotor current, and stator winding resistance, to compute these circuit parameters without field measurements (Kueck et al.