VLF Cable Testing

VLF cable testing with 0.01Hz to 0.1Hz is a standardized and state-of-the-art method to determine the condition of cables in medium- and high voltage networks. Compared to DC testing, it prevents damage to the insulation of aged, extruded cables which can cause premature loss and is suitable for various insulations, e.g. XLPE, PILC, PE, EPR.

Due to the negative side effects of DC hipot testing, VLF AC waveform testing of MV and HV cables during tests for installation, acceptance or maintenance is nowadays recommended by most of the cable testing standards, including IEEE 400.2, IEC 60502-2, DIN VDE 0276-620 and 0276-621, CENELEC HD 620 S2 and HD 621 S1.

To fit the needs of all our clients, b2 electronics offers the widest range of VLF hi-pot test sets on the market,

with test voltages from 28 kV to 200 kV (sine wave, DC, or square wave) and
output loads from 0.5 µF @ 0.1 Hz @ 20 kVrms to 0.6 µF @ 0.1 Hz @ 141 kVrms.

Key features

TD measurements with an accuracy of ± 0.1E-3
Pure sinusoidal output voltage (load-independent) over the entire power range
Continuous and unlimited operation without any thermal limitations
Easily exchangeable HV test lead
Oil-free design eliminates routine servicing and makes the HVA test sets almost maintenance-free
Safety: Dual Discharge Device (DDD) and integrated 12kV back feed protection (at 50 / 60Hz)
Programmable test sequences with a tailor-made software too