What Is the Advantage of VLF Hipot Testing?

Posted by Protec Tech Team on

High Voltage VLF-65E 65kV VLF Tester VLF hipot —very low frequency hipot — is an AC high potential instrument used for testing the dielectric strength of insulating materials at 0.1 Hz or lower. Instead of having to perform DC testing because high potential test equipment that operates at power system frequency are large, heavy and therefore not very portable, VLF high potential testing  makes testing cables and electrical apparatus in the field more practical and economical. 

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Where DC testing can leave harmful space charges in microscopic voids of solid insulation, testing with a VLF hipot exposes cable defects without harming good insulation. When you perform cable or generator testing with a VLF hipot at 0.1 Hz, it requires 600 times less power than at 60 Hz and 500 times less power than at 50 Hz. The added benefit of this type of test equipment translates into portability benefits for field testing applications. The VLF hipot test is a go/no go stress test where the load either holds the test voltage or breaks down. What could be simpler for exposing defects in cables and generators?  

VLF sinewave test equipment can also be used in monitored withstand tests where diagnostic information can be collected for Tan Delta and Partial Discharge.

Related electrical test equipment available for rent from Protec:

High Voltage VLF-65E 65kV VLF Tester

HV Diagnostics HVA28TD 28kV VLF / DC High Voltage Test Instrument

HV Diagnostics HVA30 30kV VLF / DC High Voltage Test Instrument

This electrical test equipment is available for rent, lease, or purchase from Protec Equipment Resources. We are here to help you with your testing equipment needs.

Wherever the job takes you (and the equipment), with Protec's multiple locations, we always ship from the office closest to your desired drop location (if the electrical test equipment you need is in-stock at that location), and the equipment can be returned to the nearest office.

We always consider ALL shipping options in order to save you the most time and money.

Also, if you happen to be close to one of our many office locations, walk-ins are always welcome!

Rely on the Electrical Test Equipment Rental Experts, we are there when and where you need us.

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Editor’s Note: This post was originally published October, 2010 and has been updated freshness, accuracy and comprehensiveness.

Topics: Rent Electrical Test Equipment, Hipot

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