Test the condition of the cables with VLF or DC slow voltage  
The S-24 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.  
 
The VLF test is the fastest way to detect insulation damage. The S-24 VLF 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.
 
Sonel offers online training course on the use of this product (instructional video and consultation with a specialist).
 
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