Vlf testers are smaller and more practical than ac testers but output the same amount of power as a 50 hz mains device.
Vlf cable tester.
With monitored withstand test mwt testing and diagnostics in compliance with ieee400.
This combination of size and power makes very low frequency cable testing perfect for testing longer sections of cable and apparatus.
In the first step a go no go statement is sufficient.
To ac high voltage test this cable requires the use of vlf technology.
These tests are typically carried out on a frequency between 0 1 hz and 0 01 hz and operate off of a pass fail model.
As an ideal tool for routine cable testing.
Vlf cable testing makes use of ac voltages in a frequency range of 0 01.
A long cable may have many microfarads of capacitance.
The principal use of vlf is testing medium and high voltage shielded power cables.
The design optimized for rapid transportation and quick setup and the continuous duty cycle are two attributes that qualify the system.
Once partial discharge is triggered in a defect under the test.
Vlf testing uses very low frequencies as part of an ac cable maintenance routine.
From the above relationship when comparing vlf 0 1 hz to power frequency 60 hz there is a 600x lower power and current requirement when testing a cable at the same test voltage.
When vlf withstand testing cable the proper test voltage and time duration are critical for the success of the test.
Perform the test as instructed to make best use of vlf technology.
Hva28 td vlf test set at a glance.
An ac voltage test is the best way to verify the ac integrity of a cable.
Vlf cable testing very low frequency is a technique for testing of medium and high voltage mv and hv cables.
Vlf cable testers also known as vlf hipot testers are used to conduct vlf withstand tests.
Vlf testing uses very low frequencies as part of an ac cable maintenance routine.
The hva28td vlf high voltage test set is an ultra compact lightweight 0 1 hz vlf cable tester with integrated tan delta diagnostics.
Vlf testers are smaller and more practical than ac testers but output the same amount of power as a 50 hz mains device.
Compared to traditional ac dc hipot testing vlf cable testing methods are able to more easily determine the high voltage field of.
Because the inherent capacitance of a power cable.
This has the added benefit that the size of the test instrument can be significantly reduced to allow for a very portable high voltage tester.
The device under test must withstand a vlf very low frequency ac voltage for a preset testing time without flashover.
The vlf sine wave 34 kv is a compact robust and portable vlf sine wave test system for medium voltage cables.
Vlf systems are advantageous in that they can be manufactured to be small and lightweight.
This combination of size and power makes very low frequency cable testing perfect for testing longer sections of cable and apparatus.
Making them useful especially for field testing where transport and space can be issues.
