Robust, readily portable and easy to use, the SebaKMT HVB10 high-voltage bridge from Megger allows cable and sheath faults in power cables to be prelocated reliably and accurately, even in difficult applications. The instrument, which also has facilities for sheath fault testing and sheath fault pinpointing, is particularly suitable for use on long HV cables, and in situations where pulse-reflection methods of fault prelocation do not give satisfactory results.
The HVB10 is also an ideal choice for use on sub-sea cables where a fault has been prelocated using pulse-reflection techniques, but verification of this result by a different method is needed before proceeding to the very costly step of chartering a cable repair vessel.
To provide the best possible accuracy, the HVB10 uses the bi-polar voltage drop method at voltages up to 10 kV to prelocate cable faults. This method eliminates the complicated setting up associated with conventional bridge techniques and also excludes many sources of error including, for example, voltage drop in the test leads. Bi-polar testing also means that galvanic and thermoelectric effects in the cable do not affect the test results.