Megger HVB10 High Voltage Bridge For Long Cable Fault Location
HVB10 is a highly accurate high-voltage bridge designed to locate cable and sheath faults, perform sheath testing, and pinpoint sheath faults, especially suited also for long HV cables.
With its top resolution, intermittent fault detection function, and load adaptation for faster cable charging, the HVB10 is an indispensable tool for all utilities that want to reduce downtime and facilitate repair of power and for example pilot and communication cables.
Complete with 2 different methods for fault location:
Standard Mode: providing good results for typical sheath faults, faults with fault resistances of up to some hundreds of kilo Ohms and shield cross sections in the range of 25 to 50 mm2. Typical measurement time: 30 seconds
High Accuracy Mode: Utilises the full measuring and control circuit potential. Ideally suited for prelocating difficult, high-resistive faults (eg. in the inner insulation of PILC cables). An intermittent fault detection algorithm is applied to gain a result under even worse conditions with sparking faults. Typical measurement time: 1 minute (longer due to algorithm completion time).
Megger HVB10 Key Features:
- Top class measurement and accuracy
- Automatic test sequence
- Bi-polar prelocation for the elimination of external influences
- Detection and indication of wrong connections
- Only one HV connection cable
- Completely independent of the parameters of auxiliary lines
- EasyGo operating system
Why do I need an HV bridge?
When I have ARM based prelocation!
- Because it locates faults where the otherwise perfect reflection based technologies have limits, for example on long cables such as subsea cables
- TDR reflection based technologies have very large reflections on cross bonded cables, which prevent longer ranges
- Reflection measurements are based on an impedance measurement, while the HVB10 measures resistance.
The HVB10 prelocation measurement and the common prelocation by reflection measurement or ARM (Arc Reflection Measurement) provide complementary information, which is very helpful in case of difficult faults, where critical decisions have to be done on a reliable base.
HVB10 Cable Fault Location
Accurately prelocates cable interruptions and short-circuit faults, and detects high-resistance conductor faults that cannot be prelocated with impulse reflection based methods.
The HV bridge is equipped with a strong discharge unit which allows the safe discharge of cables with a capacity of up to 25 μF. Prior to each test, a capacity measurement ensures that the expected discharge energy does not exceed these parameters and damage the HVB10. This makes is very suitable for very long cables and their parameters.
HVB10 Sheath Fault Prelocation
The prelocation of sheath faults takes place automatically. The only parameters that need to be entered are the peak test voltage and the cable length. If the cable length is not available, the fault distance is displayed as a percentage of the length. The HVB10 evaluates all measurements automatically, providing the user with a report of the test results and a statement about the sheath condition.
HVB10 Sheath Fault Pinpointing
Provides 2 different methods for fault location:
- Standard pulsed DC and the step voltage method (in combination with an earth fault probe such as the Megger ESG NT)
- 3 or 4.8 Hz signal and A-frame
Optionally, the HVB10 can be equipped with an audio frequency module. In addition to the step voltage, this module generates an audio frequency signal of 8.44 kHz for simultaneous tracing and fault pinpointing. The power can be supplied either from the mains, via the wide range AC input from 88 V to 264 V, or by using the integrated rechargeable battery for minimum of 2 hours operation. This battery can also be charged by a 12/24 DC input.