Cable fault location
The shortcut to the source of a fault
In spite of major developments in this field, faults still occur frequently in cable systems for various reasons. In addition to trained personnel, you also need very efficient equipment to rectify faults.
BAUR cable fault location devices and systems cover the entire cable fault location process: During pre-location, the position of the fault is roughly located. The subsequent pinpointing enables precise determination of the cable fault. You can use various measurement methods depending on the kind of fault and cable type.
Burn down transformers
A high-resistive fault is exposed to high voltage by a burn down transformer. This way, the fault is converted into a low-resistive fault which is easy to locate by time domain reflectometry (TDR). This technology is used for traditional lead-coated impregnated paper-insulated cables.
The correct core identification before cutting a cable is essential in view of safety and accident precaution . The computer-based BAUR APT (Amplitude – Phase – Time) method enables the core identification at a high level of security.
Cable sheath testing
Multimeter measurements enable the detection of cable sheath faults and determination of their position in lighting cables and low voltage systems.
Pin-pointing of faults
The twist method successfully applies in signalling and multi core cable systems. When usual methods do not show results, e. g. in case of direct short circuits or for the location of joints, the twist method at audio frequency can be applied.
Surge voltage generators
The acoustic method is used for accurate pin-pointing of faults. The pre-selection of filters and the measurement of signal propagation time faciliate operation under field conditions and ensure precise location of the cable fault even under the condition of a complicated soil structure and a high interference level.
Time domain reflectometers
The method of low voltage impulses is used for the pre-location of a cable fault with a high breakdown voltage of over 32 kV. A DC or VLF source releases an impulse that is flashing over at a high-resistive fault and causes a transient current wave, which is measured by the TDR and enables the distance determination of faults.
Cable route tracing
The route tracing of buried cables and other conductive systems is necessary for the successful location of cable faults. The audio frequency method, which is based on magnetic principle, enables cable tracing and depth determination by minimum or maximum modes. The precise position of cable joints can be detected by the twist method.