Case study: True dynamic resistance measurement
Pinpointing concealed problems inside a resistive-type OLTC before physical inspection - the application of true DRM.
A maintenance team at the Electric Power Transmission Network in the City of Karbala performed routine electrical tests on a transformer including: winding resistance measurements (WRM), transformer turns ratio (TTR), short circuit impedance (SCI), excitation current, and line-frequency power factor (a.k.a. dissipation factor or tan delta). This case study looks into their investigations and their results.