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Portable device for rapid detection of permanent faults on overhead medium voltage grids

The Portable discoverer unit is designed to detect permanent faults on 50 Hz and 60 Hz medium voltage lines. It is capable to detect single-phase to ground faults without any direct connection to the lines. It is generally used to carry out the operations of troubleshooting along lines without protective relays or other fault detection devices.


Thanks to its sensor it can detect faut condition without any direct connection to MV line.

Fault detection can be performed at a safety distance from the faulty MV asset.

Quick detection of the fault and the consequent restoration of the service.


Portable Discoverer Fault Detector for rapid detenction of permanenet faults
  • Fault detection using an integrated inductive sensor.
  • Noise warning for fault detection.
  • Record event with date, time and type of failure.
  • Acquisition of event log via USB port.

Technical Specifications

Microprocessor 32 bit ARM M0+
Residual current detection sensor 1 internal inductive type sensor
Residual current threshold 10 - 20 - 40 - 80 A ± 10% freely selectable
MV line distance 5 - 6 - 7 - 8 m, freely programmable
Events detection Permanent faults longer than "x" MS and amplitude above threshold with "x" freely selectable in 60 - 80 -100 -120 - 140 - 160 - 180 - 200 - 220 - 240
Power supply Li-Ion battery, 3.7 V (2200 mAh)
Battery charge Through USB port - 5 V / 500 mA
Dimension (H x W x D) Maximum 142x84x47 mm
Weigh 400 g
Operating temperature -10° C ÷ 55° C
Relative humidity ≤ 93%
Atmospheric pressure From 70 to 160 kPa
Protection degree (EN 60529) IP 31