POWER & UTILITY
DJ-1000
HV Cable On-line Monitoring and Fault Location System
About the DJ-1000
The use of cables on transmission systems is becoming increasingly common, which can make the location of faults on the system difficult to locate. The DJ-1000 uses travelling wave technology, coupled with an extremely high sampling rate, to provide an accurate fault location. The system is also capable of identifying and locating sheath faults and monitoring the load. It is applicable to HV AC cables, including underground, underwater and hybrid systems.
Photos
Key features
- High performance capture of travelling wave signals for fault location.
- Samples at 50MHz per channel, with a fault location resolution of less than 4m.
- High precision GPS time synchronization with a 20ηs accuracy.
- High fidelity reproduction of travelling wave signals.
- Fundamental frequency current measurement, for load monitoring faulty section identification using the current differential principle.
- Sheath fault detection using sensitive currents measurement.
- Indoor and outdoor, non-intrusive installation.
- AC mains powered, solar-powered and/or self-powered by the phase current.
- Communications to the master station through the 4G/5G mobile network
Detailed specifications
Scope of supply
- DJ-100 HV cable monitoring and fault location device
- 3-phase power system frequency current sensors
- 3-phase travelling current sensors
- 3-phase travel wave voltage sensors (optional)
- 3-phase + residual sheath current sensors
- Solar panel (optional)
- AC power coupling CT (optional)
- GPS antenna
- Service manual
- Master station software
Technical Data
| TRAVELLING WAVE FAULT LOCATION | ||
|---|---|---|
| Number of travelling wave analogue channels | 3 (phase currents) + 3 (phase voltages) | |
| Travelling wave sampling frequency | 50MHz | |
| GPS timing accuracy | 20ns | |
| Fault location resolution | 4m | |
| Number of power frequency analogue channels | 3 (phase currents) + 3 (sheath currents) | |
| Power frequency sampling frequency | 6.2kHz | |
| Power frequency disturbance record length | 500ms | |
| VOLTAGE SENSORS (TRAVELLING WAVE) | ||
| Measurement accuracy | 5% | |
| Measurement bandwidth | 1kHz to 10MHz | |
| Cable operating voltage range | 100V to 500kV | |
| Installation method (voltage sensor) | Outdoor overhead line to cable terminals | |
| CURRENT SENSORS (TRAVELLING WAVE AND LOAD) | ||
| Measuring range (travelling wave) | 10mA to 1000A | |
| Measuring range (load) | 10A to 5000A | |
| Measurement bandwidth (travelling wave) | 1kHz to 10MHz | |
| Measurement bandwidth (load) | 20Hz to 100Hz | |
| Measurement accuracy (travelling wave) | 5% | |
| Measurement accuracy (load) | 1% | |
| Installation method | Clip-on CT, indoor or outdoor installation | |
| Load sensor internal diameter | 200mm | |
| SHEATH CURRENT SENSOR | ||
| Measurement accuracy (Sheath current) | 0.5% | |
| Measuring range | 0 to 300A | |
| Installation method (Sheath current sensor) | Clip-on CT, indoor or outdoor installation | |
| Sheath current sensor internal diameter | 60mm | |
| POWER SUPPLY | ||
| Mains power supply | AC 220V ± 20% | |
| Power from cable load; current range | 30A to 1000A | |
| Power from cable load; installation method | Clip-on CT, indoor or outdoor installation | |
| Solar panel | 18V, 180W | |
| Battery (2 sets) for solar power back-up | 12V 20AH (40AH total) lithium-ion | |
| ENVIRONMENTAL | ||
| Maximum temperature | -20°C to 70°C | |
| Humidity | 5% to 95%RH | |
| Altitude | ≤3000m | |
| Atmospheric pressure | 80 kPa to 106kPa | |
| Insulation withstand level | DC 10kV/1min | |
| Ingress protection | IP54 | |
| PHYSICAL CHARACTERISTICS | ||
| Dimensions (main unit) | 350 x 300 x 430mm | |
| Weight (main unit) | 34Kg | |
