Navigator LM | Navigator LM HV
The Navigator faulted circuit 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 can differentiate 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 an automatic re-closing) switches the LED to double flashing mode.
- Fault detection
- LED indication with 360 degrees of visibility
- Double-flashing mode upon detection of a second fault
- Battery status indication
- Reset depending on type: manual, current restoration, voltage restoration
- Mounting on live overhead lines possible
- Navigator-LM HV: permissible voltage ≤161 kV
Technical specifications
| Short-circuit trip current | ≥100 A / ≥100 ms, load-dependent self-adjustment |
|---|---|
| Response delay short-circuit | - |
| Accuracy | ±10 % @ 20 °C |
| Self-adjustment | ≥30 A load current |
| Trip factor | 4 – 6 x load current |
| Adjustment delay | 60 s |
| Peak load memory | 72 h |
| Indication (short-circuit/earth fault) | 4 red LEDs (>5,000 mcd resp. 7000 mLm each LED) 2 yellow LEDs (>5,000 mcd resp. 7,000 mLm each LED) |
| Visibility | >50 m / day, >150 m / night, 360 degrees of visibility |
| Flash rate | 30 flashes per minute, total indication time >500 h |
| Manual reset | With magnet (Version A, B, C, E) |
| Automatic time reset | 4 h ±10 % (2 or 8 h) (Version A, B, C, E) |
| Remote reset | - |
| Reset on current restoration | >3 A load current (Version A) Red LEDs turn off, yellow flash until manual or time reset (Version C) |
| Reset on voltage restoration | ≥5 kV line voltage (Version E) |
| Current measurement accuracy | - |
| Tripping | - |
| Power supply | Lithium battery, replaceable, shelf life ≥20 years |
| Battery check | 1 yellow LED, flash rate: 6 per minute, 6 month |
| 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 |
| Event reporting | - |
| Remote monitoring | - |
| Communication | - |
| Cellular (WAN) | - |
| Server | - |
| Remote maintenance | - |
| Installation | - |
| Pairing | - |
| Housing | UV resistant polycarbonate / polyamide, IP68 Clamping yoke: stainless steel |
| Temperature range | –30 to +75 °C (IEEE 495: −40 to +85 °C) |
| Cable diameter | Navigator LM: 8 – 29 mm Navigator LM HV: 13 – 36 mm |
