HVI manufactures the most portable and easiest to use VLF hipots available. Offering the largest selection in the industry (including CE marked models), voltage ratings range from 30 kV – 200 kV with load ratings from 0.4 µF – 50 µF.

A VLF hipot is an AC output tester with an output frequency of 0.1 Hz or lower rather than 50/60 Hz. Although the frequency is very low, it is an alternating current with polarity reversals every half cycle.

Apr 25, 2024 · VLF testing is more focused on simulating operational stresses at lower frequencies, whereas hipot testing is geared towards quickly assessing insulation strength and detecting immediate breakdown points at higher voltages.

VLF cable testing (Very Low Frequency) is a technique for testing of medium and high voltage (MV and HV) cables. VLF systems are advantageous in that they can be manufactured to be small and lightweight; making them useful – especially for …

What VLF hipots are available? HVI produces VLF hipots that produce from 30 kVac up to 200 kVac with load ratings from 0.4 µF to 50 µF, the equivalent capacitance ratings of cable approximately 3000’ (914 m) to 40 miles (64 km) in length and

Aug 20, 2018 · I'm more interested in hearing the community discussion of using the VLF for AC HiPot for or against arguments. From what I understand the issue with DC hipotting has something to do with the rectification process and filtering.

High potential (hipot) cable system testing can be performed using DC, AC or Very Low Frequency AC (also known as VLF) test voltage. Such testing can be conducted as an acceptance test for new installations or as a maintenance test for existing installations.

The VLF-34E is a new generation VLF AC hipot that uses a solid state design with microprocessor controls. It meets the requirements of applicable world standards regarding cable testing up to 25kV class Maintenance testing.

A VLF hipot is just an AC output tester but with an output frequency of 0.1 Hz or lower rather than 50/60Hz. Although the frequency is very low, it is still an alternating current with polarity reversals every half cycle.

VLF tests use frequencies between 0.1 Hz and 0.01 Hz, allowing for testing at lower voltages while still achieving effective insulation testing. In contrast, hipot testing involves applying high voltages, often several times the rated voltage of the equipment under test. VLF Hipot Testing can effectively reduced the risk of electrical shock.