Engineers prefer to test electric cables using very low frequency or VLF Hipot testing because of its safety and simplicity. This diagnostic test checks if the cable is still capable of withstanding the electricity passing through it. A test voltage of slightly higher than the cable's rating is applied and held for a specified time depending on the purpose for which the test is being performed. If the cable is bad, the defects in the cable will further deteriorate to the point of failure.
AC Hipot testing at the power system frequency requires a significantly higher level of energy than the same test performed at a relatively low frequency. The ability to test at lower frequencies (0.1 Hz) makes test equipment lighter while avoiding the potentially harmful effects of DC high potential testing. VLF high potential testing also doesn't generate traveling waves during testing and doesn't worsen the condition of insulators damaged by water treeing.
Preventive maintenance is the best protection against electrical hazards and damage to equipment. With Protec, conducting maintenance checks without the expense incurred in purchasing the tools needed is possible with our large inventory of test equipment from major brands, available for rent at affordable rates and variable terms.
Related electrical test equipment available for rent from Protec:
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.
Editor’s Note: This post was originally published April 2011 and has been updated freshness, accuracy and comprehensiveness.