HVB10 could be an extremely correct high-voltage bridge designed to find cable and sheath faults, perform sheath testing, and pinpoint sheath faults, particularly suited conjointly for long HV cables.
With its prime resolution, intermittent fault detection operates, and cargo adaptation for quicker cable charging, the HVB10 is an imperative tool for all utilities that wish to scale back period and facilitate repair of power and for instance pilot and communication cables.
The HVB10 has two different methods for fault location:
The standard mode, which provides good results for typical sheath faults with fault resistances of up to some hundreds of kilo Ohms and shield cross sections in the range of 25 to 50 mm2. This measurement is typically done in app 30 seconds
The high accuracy mode, which takes approximately 1 minute for the algorithm to complete, but will utilize the full potential of the measuring and control circuits of the instrument. Thus, it is ideally suited for pre-location difficult, high-resistive faults (e.g. 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.
Why do you need an HV bridge when you have ARM-based pre-location?
Because it locates faults where the otherwise perfect reflection based technologies have limits, for example on long cables 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. Resistance- and impedance values can be completely different while having the same cause.
The HVB10 pre-location measurement and the common pre-location 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.
Key features of HVB10 high voltage bridge for fault location:
Top class measurement and accuracy
Automatic test sequence
easy Go operating system
Only one HV connection cable
Completely independent of the parameters of auxiliary lines
Bi-polar prelocation for the elimination of external influences