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Based on two-probe inductive coupling and two-port cascade network theorem, in-circuit impedance extraction of primary of operational transformer has been discussed and validated. The importance of this approach is to overcome drawbacks in existing on-line Frequency Response Analysis (FRA) which is used to monitor impedance of the transformer winding to detect movement or deformation of transformer...
Based on inductive coupling approach, an on-line impedance frequency response method is proposed for early detection of defects in induction motors. Using a 4-pole induction motor as a system-under-test, the proposed method is validated experimentally through emulated inter-turn and shorted coil. Statistical indicators are also introduced for better detection of faults in the motor. As the setup has...
By treating the inductive coupling probes and the electrical system to be monitored as three cascaded two-port ABCD networks, the in-circuit impedance of the electrical system can be extracted with ease. The proposed method simplifies the setup calibration and allows real-time impedance monitoring of critical electrical system to be implemented without interrupting its normal operating conditions...
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