What is the difference between VLF and hipot?

What is the difference between VLF and hipot?

VLF hipot test has the same advantages as DC hipot testers – they are relatively small and light weight. But unlike DC hipot testing, the IEEE standard does not caution that VLF hipot testing may not provide meaningful information.

What is AC hi pot test?

A dielectric strength test, commonly called a hipot test, dielectric withstand, or high potential, is a stress test of the insulation of a device under test (DUT). Such a test applies a voltage to the DUT that is much higher than normal operating voltage; typically 1000V AC plus twice the normal operating voltage.

What is a Hi Pot transformer?

HiPot, or high potential, is a class of electronic test equipment used to verify electrical insulation. Engineers use HiPot-testing instruments on cables, wires, circuit boards, appliances, electric motors, and transformers.

How does hi pot work?

Hipot testing uses a high voltage source to make sure insulation is doing its job. An AC hipot test uses a voltage source that continually changes its voltage. The voltage alternates from positive to negative and back again. Generally there are 50 or 60 complete cycles of the alternating voltage each second.

What is VLF used for?

The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines.

What is the purpose of VLF testing?

Very Low Frequency testing for Medium Voltage and High Voltage cables is a method for verifying the integrity of the cable insulation. VLF testing is a withstand test usually carried out at a frequency of between 0.1 Hz and 0.01 Hz rather than 50/60 Hz.

Is hipot testing destructive?

The hipot test can be a destructive test; especially when very high test voltages are used. A catastrophic failure of the unit may result if a test voltage greater then 2500 Vac is applied between primary and secondary circuits.

How does VLF testing work?

VLF testing is a withstand test usually carried out at a frequency of between 0.1 Hz and 0.01 Hz rather than 50/60 Hz. The test is conducted on entire drum of cable rather than a test sample length. Although the frequency is very low, it is an alternating current with polarity reversals every half cycle.

What are hi pots?

A hi-pot (a shorted way to say high potential or high voltage) is a term used for electrical safety testing instruments used to verify electrical insulation in finished appliances, cables or other wired assemblies, printed circuit boards, electric motors, and transformers.