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
- Available for powerline below 500kV (also for Multilinear)
- Detect faults by the fault current phase
- No power sources
- Can be attached to a hot line
- Can be detected from the ground
- Replace indicators only after operation
- 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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*Examples for G50 and G15H on the top of a transmission tower
Accessories included
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Compatible indicators
- FR-type indicator
- F-type indicator (Japan only)
Validity period
G-Finder™ : 10 years
FR-type indocator : 10 years
F-type indicator (Japan only) : 5 years
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