The compact, robust and portable cable test set is used for testing of medium voltage cables in accordance to the standards IEEE400, IEC 60502-2, CENELEC HD 620 & 621 and DIN VDE 0276/620 & 621. The test is carried out with a low strain practice with VLF (very low frequency) test voltage at 0.1 Hz frequency.
 
VLF test enables detection of damages of the insulation within shortest test time. The S  VLF series device can test cables with extruded insulation (XLPE-, PE-, EPR-insulation) as well as cables with paper-oil insulation (PILC). Cable sheath testing with direct voltage is also possible.
 
Features
Extremely compact high-power VLF test device
Easily portable for 1-2 people
Simple operation: menu-assisted control with industrial class OLED display
Fully automatic test sequence
Integrated timer 1-300 min with automatic tripping
Integrated breakdown detection
Integrated fault time detection
Voltage measurement direct at HV output
Protective ground connection
High voltage start key interlock
Protective circuit / indication in accord. with EN 50191
Leakage current measurement during VLF test
 
Optional features
Data logging (USB stick) for VLF test sets
Frequency extension: 0.05 + 0.02 Hz
Customized test cables
Transport case
 
Power supply
230 V (±10%), 10 A, 50/60 Hz
 
Output voltage
0…57 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…62 kV DC
 
Voltage waveshape
 
VLF
similar sine-wave, symmetrical, with True RMS measurement
DC
direct voltage, negative and positive polarity
 
Overcurrent trip (DC)
10 mA
 
Max. testable cable length, max. capacitance (VLF)
up to 60 km (15.0 µF at 18 kVRMS, 0.02 Hz)**
**at a cable capacitance of approx. 0.36 µF/km
 
Max. load at max. output voltage (VLF) and 0.1 Hz
0.9 µF at 57 kVRMS
 
Discharge - integrated automatic discharge device
max. 12500 J
 
Voltage measuring range
-70…0…70 kV accuracy ±1%
 
Current measuring ranges
±0…100 µA / 1 mA / 10 mA