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Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
Email Address. Sign In. Whenever possible, cable systems are treated in a similar manner to individual cables. Tables are included as an aid to identifying the effectiveness of the VLF ac voltage test for various cable system insulation problems. Scope: This guide describes VLF withstand and other diagnostic tests and the measurements that are performed in the field on service-aged shielded medium and high-voltage cables rated 5 kV through 69 kV with extruded and laminated insulation.
VLF test methods utilize ac signals at frequencies less than 1 Hz. The most commonly used, commercially available, VLF test frequency is 0. Tables are included of the recommended test voltage levels for installation, acceptance, and maintenance tests. Purpose: This guide is intended to provide troubleshooting and testing personnel with information to test shielded medium- and high-voltage cable systems rated 5 kV through 69 kV using VLF ac techniques.
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VLF cable testing
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. Once partial discharge is triggered in a defect under the test voltage, enough time must be allowed to permit the PD to create an electrical tree and grow to failure. The test voltage and time duration are both critical to causing failures at defect locations severe enough to be triggered into PD during the test.