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MONITORING PRESSURE in real time is one
of the critical parameters in a pipe-type cable installation and
proves to be challenging by traditional methods, whether it is done
manually or with pressure transmitters Common problems with
hard-wired pressure transmitters around the substation environment
include noisy signals caused by high EMF, and damage to the
transmitters themselves due to lightning, switching surges, and
ground loops. Measuring other parameters such as dielectric fluid
tank level, flow, and temperatures within the substation all involve
similar challenges.
The wireless transmission technology
known as “frequency hopping - spread spectrum” has proven successful
in a wide range of applications for monitoring pressure, level, flow
and temperature at different substations. Other applications include
the dynamic feeder rating calculation using temperature and current
data on solid dielectric cables. Transmission distances of 2500 feet
between the field units and receiver station are easily achievable,
and longer distances can be accommodated using high gain antennas.
Steel structures and other obstructions in the transmission path do
not compromise signal strength.
The wireless field
transmitters provide a “true wireless” solution, since the sensors
run on integral lithium batteries designed to last 5-7 years at a
data transmission interval of 30 seconds. The monitoring system
built around the wireless network is designed to provide real time
diagnostics of the system, including battery status and connectivity
status. Faster scan rates can be automatically triggered by alarm
events, and real-time logging and trending provide useful historical
information. All variables can be easily viewed on a color TFT
touch screen display with Ethernet capabilities for LAN and/or web
connectivity. Data can also be moved wirelessly to additional
control locations. |
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BENEFITS
Real
time monitoring in the control room allows immediate alarming of any
critical changes in pressure, temperature, level, or flow, allowing
quick reaction by operators to avoid costly cable damage and
repairs. |
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