Vlf Cable Tester

The principal use of vlf is testing medium and high voltage shielded power cables.

Vlf cable tester.

The design optimized for rapid transportation and quick setup and the continuous duty cycle are two attributes that qualify the system. The device under test must withstand a vlf very low frequency ac voltage for a preset testing time without flashover. An ac voltage test is the best way to verify the ac integrity of a cable. In the first step a go no go statement is sufficient.

If a vlf test is too low in voltage and or too short in duration more harm than good may result. Vlf cable testing very low frequency is a technique for testing of medium and high voltage mv and hv cables. 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. If a cable can t hold 2 3 times normal voltage it is not.

Vlf cable testing makes use of ac voltages in a frequency range of 0 01. Once partial discharge is triggered in a defect under the test. With monitored withstand test mwt testing and diagnostics in compliance with ieee400. The hva28td vlf high voltage test set is an ultra compact lightweight 0 1 hz vlf cable tester with integrated tan delta diagnostics.

Making them useful especially for field testing where transport and space can be issues. This combination of size and power makes very low frequency cable testing perfect for testing longer sections of cable and apparatus. As an ideal tool for routine cable testing. To ac high voltage test this cable requires the use of vlf technology.

Vlf cable testing is the cutting edge technology for proof testing of fully operating medium voltage cables and the detection of faulty ones. This combination of size and power makes very low frequency cable testing perfect for testing longer sections of cable and apparatus. When vlf withstand testing cable the proper test voltage and time duration are critical for the success of the test. Vlf testers are smaller and more practical than ac testers but output the same amount of power as a 50 hz mains device.

Vlf testers are smaller and more practical than ac testers but output the same amount of power as a 50 hz mains device. Because the inherent capacitance of a power cable. Hva28 td vlf test set at a glance. Vlf testing uses very low frequencies as part of an ac cable maintenance routine.

Perform the test as instructed to make best use of vlf technology. The vlf sine wave 34 kv is a compact robust and portable vlf sine wave test system for medium voltage cables. A long cable may have many microfarads of capacitance. Vlf cable testers also known as vlf hipot testers are used to conduct vlf withstand tests.

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. 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.