G-Finder™

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A clear indicator of the ground fault tower

The G-finder™ detects ground faults caused not only by lightning but also by animals, etc. and then indicates the fault tower. It utilizes the fault current as a power source, therefore no battery is necessary. G-Finder™ is highly effective in early detection of the ground fault tower.

Features

  1. Available for powerline below 500kV (also for Multilinear)
  2. Detect faults by the fault current phase
  3. No power sources
  4. Can be attached to a hot line
  5. Can be detected from the ground
  6. Replace indicators only after operation
  7. No maintenance necessary

Operation principles (G15H)

The ground fault current is detected by the detection coil fitted to the overhead ground wires on either side of the tower. If a ground fault occurs, the fault current branches to the overhead ground wires as well as to the ground. Additionally the fault current branches to the towers adjacent to the fault tower where the G·finder™ detects the phase difference of these currents and indicates only the fault tower. Generally, phase detection needs IC circuits and power, but Gfinder needs no battery thus no maintenance is necessary. For the towers without ground wires, G3HC, G3HS or G0 are applicable.

Type

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G15TH is for three-way branch and G15X is four-way branch

Specification by type

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Type System Number of overhead
ground wires
Max ground
fault current
Conditions for
operation
G15H Resistance
grounded system
1 100A or over 30A or over 3 cycles or over 
2 200A or over
G15TH Resistance
grounded system
1 100A or over 40A or over 3 cycles or over
2 200A or over
G15X Resistance
grounded system
1 200A or over 85A or over 3 cycles or over
2 400A or over
G50 Direct
grounded system
1 to 3 1kA or over 2 cycles or over
G3HC Resistance
grounded system
None 100A or over 5A or over 15 cycles or over
G3HS Resistance
grounded system
None 100A or over 10A(5A+5A) or over  12 cycles or over
G0 No
grounded system
None Line distance 4km or over 0.5A 36 cycles or over

How to install

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*Exampels for G50 and G15H

Accessories included

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Compatible indicators 
  • Type-F indicator
  • Type-R indicator

Validity period

GFinderTM: 10 years
F-Type indicator:5 years
FR-Type indocator:10 years

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