Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Space - charge or interfacial polarisation
Polarization mechanisms in dielectrics
This polarisation occurs due to the accumulation of charges at at the electrodes or at the interfaces of multiphase dielectric materials (two or more phases).
SPACE -
CHARGE OR INTERFACIAL POLARISATION
This polarisation occurs due to the
accumulation of charges at at the electrodes or at the interfaces of multiphase
dielectric materials (two or more phases).
When
such materials are subjected to an electrical field at high temperature, the
charges get accumulated at the interfaces (fig. 1.8). These charges create
dipoles. As a result, polarisation is produced. This kind of polarisation is
known as space - charge polarisation.
Space
- charge polarisation is very small when compared to other polarisation
mechanisms and it is not common in most of the dielectrics.
Example
This polarisation occurs in ferrites and
semiconductors.
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation : Tag: : Polarization mechanisms in dielectrics - Space - charge or interfacial polarisation
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Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation