The S-36VLF high voltage insulation tester is a compact, robust and portable kit for testing medium voltage cables according to IEEE400, IEC 60502-2, CENELEC HD 620 and 621 and DIN VDE 0276/620 and 621. The test is carried out using the low electrical stress method, with a VLF (Very Low Frequency) voltage of 0.1 Hz. The VLF test is the fastest way to detect insulation damage.
 
The S-36VLF instrument can test cables with plastic insulation (XLPE, PE-, EPR) as well as paper and oil insulation (PILC). Testing with DC 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…36 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…52 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 µF at 18 kVRMS, 0.02 Hz)*
*at a cable capacitance of approx. 0.25 µF/km
 
Max. load at max. output voltage (VLF) and 0.1 Hz
2.4 µF at 36 kVRMS
 
Discharge - integrated automatic discharge device
max. 12500 J
 
Voltage measuring range
-60…0…60 kV accuracy ±1%
 
Current measuring ranges
±0…100 µA / 1 mA / 10 mA