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The presence of moisture in a transformer
deteriorates the insulation by decreasing its
electrical, mechanical, and thermal strength.
Therefore, it is critical to monitor the moisture
condition in both liquid and solid insulation.
This book performs an extensive study of on-line
moisture monitoring for transformer insulation
systems and provides new tools and advanced
approaches on this topic.
A new set of moisture equilibrium curves for oil and
paper systems is constructed with a wider range than
reported in prior literature. Such curves can be
used to predict moisture in the paper insulation
from oil moisture measurements taken when the system
is in equilibrium.
When the system is not in equilibrium, the three-
wavelength interdigital dielectrometry sensor
developed at MIT provides a unique way to non-
destructively measure the spatial profile of the
moisture distribution in transformer pressboard. A
universal curve is found relating dielectric
properties to moisture concentration and
temperature. The diffusion coefficient for
pressboard as a function of temperature and moisture
concentration is estimated.
deteriorates the insulation by decreasing its
electrical, mechanical, and thermal strength.
Therefore, it is critical to monitor the moisture
condition in both liquid and solid insulation.
This book performs an extensive study of on-line
moisture monitoring for transformer insulation
systems and provides new tools and advanced
approaches on this topic.
A new set of moisture equilibrium curves for oil and
paper systems is constructed with a wider range than
reported in prior literature. Such curves can be
used to predict moisture in the paper insulation
from oil moisture measurements taken when the system
is in equilibrium.
When the system is not in equilibrium, the three-
wavelength interdigital dielectrometry sensor
developed at MIT provides a unique way to non-
destructively measure the spatial profile of the
moisture distribution in transformer pressboard. A
universal curve is found relating dielectric
properties to moisture concentration and
temperature. The diffusion coefficient for
pressboard as a function of temperature and moisture
concentration is estimated.