Navigator LM | Navigator LM HV
Overhead line short-circuit indicator with phase-selective fault indication
The Navigator LM is an electronic indicator intended for medium-voltage overhead line networks.
The indicator has a load-dependent self-adjustment of the response current, i.e. it constantly monitors the load current of the overhead line and automatically determines the corresponding response value for short-circuit detection depending on this. The maximum load current determined is stored for at least 72 hours so that the indicator is always optimally adapted to the network to be monitored, even with a low instantaneous load.
The indicator has an integrated battery check. When the battery capacity drops from the original 500 to 50 hours of remaining flashing time, a yellow LED indicator light starts to flash for 6 months.
The Navigator LM distinguishes between two short-circuit excitations: A first short-circuit excitation leads to a steady flashing LED display. If a second short-circuit is detected within the reset time (e.g. after AWE), the flashing frequency switches to double flashing.
Product features
- 360° all-round LED display
- Battery check indicator
- Double-flash function for second fault detection
- Depending on version: Manual / current / time reset and reset on voltage recovery
- Can be mounted under voltage
- Navigator LM HV: permissible voltage ≤161 kV
Your added value
- Maintenance planning made easy: 6-month LED warning when the battery is low avoids unplanned downtime
- Automatic adjustment: Automatic adjustment to network conditions ensures reliable fault detection.
- Fast troubleshooting
Technical data
| Navigator LM | Navigator LM HV | |
|---|---|
| I>> Response values short-circuit current | >= 200-1000 A / 100 ms, self-adjusting to the load current |
| Response tolerance | ±10 % at 20 °C |
| Self-calibration | >=30 A load current / response current = 4-6 x load current from 60 s load current flow time / 72 h hold time |
| Indicators (short-circuit / earth fault) | Ultra-bright LEDs / Visibility >50 m during the day / >150 m at night / 360° all-round visibility |
| Reset |
|
| Power supply | Replaceable lithium batteries, service life >= 20 years, display time >500h |
| Battery control | One yellow LED, flashing frequency: 6 per minute, 0.5 years |
| Max. Permissible voltage | Navigator LM: ≤46 kV / 50 Hz or 60 Hz Navigator LM HV: ≤161 kV / 50 Hz or 60 Hz |
| Dielectric strength | Navigator LM: 25 kA / 3 s Navigator LM HV: 40 kA / 1 s |
| Cable diameter | Navigator LM: 8 – 29 mm Navigator LM HV: 13 – 36 mm |
| Housing | UV-resistant polycarbonate / polyamide, IP68 Folding yoke: stainless steel |
| Temperature range | -40 °C to +85 °C (IEEE 495: -40 °C to +85 °C) |
All important documents for the device
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Matching articles
PERFECT MATCH
Here you will find the matching equipment set and accessories for this item. All components are technically matched to each other and guarantee optimum functionality. For customer-specific requirements and individual offers, please contact our sales department.
Equipment set
- 1 Navigator LM | Navigator LM HV display unit
Other overhead line indicators
Smart Navigator 2.0 |
Smart Navigator 2.0 HV
- Overhead line short-circuit indicator with fast fault detection
- Built-in mobile radio modem
- Remote reporting of measured values - highly accurate measured current values, load flow direction & conductor cable temperature