EdgeTech
Instrument Protect Power Switch Insulators from Dangerous Effects
of Moisture Contamination
Reliable monitoring of moisture levels provides safety and efficiency
for
high voltage power transmission
Marlborough,
MA - EdgeTech instruments have again been chosen to keep
the power industry running safely and efficiently. Bonneville Power
Administration (BPA), a world leader in high voltage power transmission,
relies on EdgeTech's DewTrace™ Model 1C hygrometer to detect
moisture contaminants that create hazards for switching contacts
on power lines.
Moisture
dampens performance
The
mechanical switches in circuit breakers and transformers must be
insulated with transformer oil or SF 6 (sulfur hexafluoride) gas
to protect the electrical current routing through them from arcing
or "flash over." The higher insulating value of SF6 permits
circuit designers to position switches closer to the walls of the
enclosure and other components, resulting in smaller, lighter, and
less costly switches. But if moisture migrates inside the enclosure,
it contaminates the SF6, creating decomposition and toxic effects.
The
oil used as insulation in power transformers is also adversely affected
by moisture. In order to cushion the effects of the oil's expansion
and contraction with temperature, a nitrogen blanket covers the
oil. If moisture from the environment or from the oil itself enters
the blanket, it can oxidize the switches and reduce efficiency.
EdgeTech
sets standard
To
detect moisture in both SF6 and blanket nitrogen, it is necessary
to establish measurement locations in the field and also at the
standards calibration lab. BPA uses the Model 1C DewTrace™
moisture analyzer to measure trace moisture in the field.
Regarding
such consistency a BPA Labs publication stated, "These standards
are critical to BPA's reliability, safety and financial well-being.
. . "
To download the Model 1-C DewTrace Brochure click
here.
EdgeTech
Moisture & Humidity is headquartered in Marlborough, MA where
the company performs all product design, development, and manufacturing.
For more information on EdgeTech products, please visit www.edgetech.com
or call 508.263.5900 or Toll Free 800.276.3729.
Contact:
Ken
Murray
Phone 508-263-5900
Email: h2o@edgetech.com | 
