What does VLF test for?
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.
What is a VLF meter?
VLF Meter – VLF stands for “Very Low Frequency”, i.e. frequencies of 0.1 Hz and below. The VLF meters generate an AC sine wave voltage waveform at a low frequency of 0.1 Hz or less. When used, the test voltage is applied for the desired duration during which the DUT either maintains the voltage or collapses.
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 VLF Tan Delta testing?
Very low frequency (VLF) tan delta testing is a precise and non-destructive method to provide information on the extent of ageing in cable insulation. The test applies an AC sinusoidal waveform at 0.1 Hz frequency and measures the degree of real power dissipation (or losses) in a dielectric material.
What is VLF kit?
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 field testing where transport and space can be issues.
What is VLF signal?
ELF/VLF stands for Extremely Low Frequency and Very Low Frequency, and refers to the range 300 Hz to 30 kHz. We’re talking about radio waves, like the AM/FM signals you get, just at an even lower frequency.
Who uses VLF?
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 frequency is VLF?
VLF electromagnetic technology is used in the frequency range of 15–30 kHz. VLF utilizes the carrier waves of distant powerful communications transmission of military organizations also.