Ground Mounted Fault Passage Indicator
Chris Goodhand, Innovation Manager (01977 605641)
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Innovation Funding Incentive
High Voltage Technology
The development of a new type of fault passage indicator that is
intended to measure the magnetic field strength associated with each
phase conductor in a three phase cable to give an indication of both
phase to phase and phase to earth faults. The device is intended to use
three magnetic field sensors placed around a trefoil cable in close
proximity to each phase core. The device is intended to overcome the
problems associated with earlier types of fault passage indicators,
Many of those presently in service require a manual re-set following
fault detection (this has been overcome by more modern types but
the retrofit problems remain).
The projects aims to correlate the externally detected magnetic fields around a three
phase cable to the positive, negative and zero sequence currents within
the phase conductors, thereby determining fault types.