A new application has been identified for the Suparule
Planar Magnetic Current Sensor technology. This involves
the measurement of very low currents (down to 250uA) in
an environment where there are conductors carrying up
to 150A within a distance as short as 25cm.
The image above shows such an application where the sensor
is used to measure leakage current across an insulator
used to mount HV conductors to supporting pylons. The
PMCS-based sensor is mounted on the non-HV side of the
insulator. The PMCS technology senses the low-level leakage
currents, while rejecting interference caused by the magnetic
and electrical fields associated with the high current-carrying
HV conductor. This application allows the sensor to be
used to monitor such leakage current, which can then be
wirelessly forwarded to a control centre tasked with monitoring
deteriation in the insulating effects of the insulator,
thereby helping to implement timely maintenance before
costly flash-overs occur.
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