Navigator LM | Navigator LM HV
Overhead line short-circuit indicator with phase-selective fault indication
The Navigator fault passage indicator is an electronic device which is designed for medium voltage utility overhead lines.
The indicator is provided with a self-adjusting load-dependent control of the trip current level. This function allows the indicator to continuously sample the load current on overhead lines and automatically set a
corresponding trip value for fault detection as a function of the load current. The maximum load current sampled by the indicator, is kept in a memory for a period of at least 72 hours. Thus, the indicator is most favourably adapted to the network to be monitored, even if low load is currently present.
The indicator is provided with a built-in battery control. When the battery capacity decreases from a total indicating time of 500 hours to a residual time of 50 hours, the yellow LED of the display starts flashing for a period of 6 months.
The Navigator LM differentiates between two subsequent short-circuit detections. Upon the detection of a first short-circuit, the LED indicator light starts flashing at equal rates. The detection of a second short-circuit (e. g. after ARC) switches the LED to double flashing mode.
Product features
- LED indication with 360 degrees of visibility
- Battery status indication
- Double-flashing mode upon detection of a second fault
- Reset depending on type: manual, current restoration, voltage restoration
- 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>> Short-circuit trip current | >= 200-1000 A / 100 ms, self-adjusting to the load current |
| Accuracy | ±10 % at 20 °C |
| Self-adjustment | >=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 |
| Withstand current | 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 Clamping yoke: stainless steel |
| Temperature range | -40 °C to +85 °C (IEEE 495: -40 °C to +85 °C) |
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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