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This contribution introduces a newly developed dielectric response method to measure the dielectric response and calculate the moisture concentration in oil-paper insulated power transformers. This method combines the measurement of charging and discharging currents in time domain (Polarization and Depolarization Currents PDC) and the dielectric spectroscopy in frequency domain (Frequency Domain Spectroscopy...
This paper discusses present day and new on-site approaches to determine moisture in power transformers: dielectric response methods and equilibrium diagrams. In recent years dielectric diagnostic methods have been developed, which derive moisture concentration of the solid insulation from its dielectric properties. This paper presents a new method, which combines measurements in frequency and time...
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