The S-44 VLF 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.  
 
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
110 V (100 V...127 V),15 A, 50/60 Hz
 
Output voltage
0…44 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 6 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
1.0 µF at 44 kVRMS
 
Discharge - integrated automatic discharge device
max. 12500 J
 
Voltage measuring range
-65…0…65 kV accuracy ±1%
 
Current measuring ranges
±0…100 µA / 1 mA / 10 mA