BAUR/HVT Frida - VLF Tester and Diagnostics Device

The portable BAUR viola and viola TD devices are used for:

• Testing medium-voltage cables and electrical equipment (generators, transformers and switch gear)
• Cable sheath testing
• Cable diagnostics (viola TD):
  • Dissipation factor measurement and Monitored Withstand Test with tan δ
  • Partial discharge measurement*
  • Full Monitored Withstand Test with tan δ and partial discharge measurement*

The VLF testing makes it possible to locate insulation faults in plastic and paper in zulated mass-impregnated cables in the shortest of testing times without impairing the quality of the surrounding insulating material.

The dissipation factor diagnostics with 0.1 Hz VLF truesinus® provides differentiated information on the ageing condition of paper-insulated mass-impregnated and PE/XLPE cables. In the case of PE/XLPE cables, the dissipation factor measurement is capable of differentiating between new, slightly or severely "water tree"-damaged cables. This makes it possible to prioritize the need to replace cables.

The Monitored Withstand Test with tan delta combines the cable testing and dissipation factor measurement, allowing an accurate and comprehensive assessment of the cable condition. In addition, there is minimum load on the cable due to the optimized test duration.

Diagnostic Reporter – Sample log (extract)

General Information

• Data transfer via USB interface
• Management of test and measurement data with PC software
• Automatic discharge unit
• Optionally expandable
• viola: to a PD diagnostics system
• viola TD: to a PD and full MWT diagnostics system

Full Monitored Withstand Test

Combination of methods for more significant information

With the BAUR viola TD VLF tester and diagnostics device and in combination with the PD-TaD 60 PD portable diagnostics system, you can measure dielectric losses and test the cable route for partial discharges during the VLF cable testing. This combination of methods is called Full MWT and provides significantly more information than the cable test alone. While the cable test shows whether the cable system can withstand a load over a specified test duration, the dissipation factor measurement enables an evaluation of the condition of the cable insulation. Moreover, a partial discharge measurement shows and locates the PD faults precisely. The highlight of MWT is the condition-based test duration: Provided it is permitted, the test duration can be shortened, which in turn lowers costs. This way, the cable is only exposed to the increased test voltage for the required duration.

VLF truesinus ® - A voltage shape for all methods and method combinations

VLF truesinus® is the only voltage shape that enables both the reliable voltage tests as well as precise dissipation factor and partial discharge measurements. Unlike other voltage shapes, the VLF truesinus® voltage is load-independent, symmetrical and continuous. This is a prerequisite for high precision as well as reproducibility and comparability of measurement results.