IEEE Std ™ I. EEE Standards. TM. IEEE Guide for Field Testing of Shielded Power. Cable Systems Using Very Low. “IEEE Guide for Field Testing and Evaluation of the Insulation of Shielded Power IEEE “Guide for Testing of Shielded Power Cable Systems using Very. Guided IEEE Series (Bundle) Standards IEEE – • IEEE Guide for Field Testing of Shielded Power Cable Systems Using Very.
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Skip to main content. Log In Sign Up. Very low frequency VLF withstand and other diagnostic tests and measurements that are performed using VLF energization in the field on shielded power cable systems are described in this guide.
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.
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VLF cable testing – Wikiwand
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Balloters may have voted for approval, disapproval, or abstention. The Working Group would also like to thank EPRI for allowing the use of its data to expand the data base thus allowing greater precision in the data. John Kulick, Chair David J. Law, Vice Chair Richard H. A significant investment with respect to electric power systems is underground cables.
A high degree of reliability and reasonable life expectancy of cable systems are necessary. In order to get the optimum performance, standards and guidelines have been developed which address the specific testing requirements for new and service-aged extruded and laminated dielectric cable insulations. This Guide is one part of a series of guides that discuss known diagnostic techniques for performing electrical tests in the field on shielded power cable systems.
It is intended that the technique-specific guides provide the definitive information on voltages, times and criteria. Ideally, field withstand testing of cable systems would be done using the same power frequency as would normally applied to the cable under operating conditions, but at higher test voltage.
High-voltage dc testing would eliminate the charging current issue associated with ac tests, but would not subject the cable system to the voltage stress distribution that it is exposed to under normal operating conditions.
Furthermore oeee are significant negative issues affecting the integrity of aged cross linked polyethylene XLPE cable after it is exposed to high-voltage dc tests and then placed back into service.
There is also the unknown influence of elevated dc voltage on other extruded cables such as mineral-filled EPR. In iede, dc is not effective in detecting many forms of gross defects that may be present in a cable system that will otherwise be detected by VLF or at operating frequency. The charging current at a very low frequency of 0. This guide provides a definition of VLF, a description of the wave-shapes and their magnitudes and frequencies that can 4002.
applied as a source for overvoltage field testing, the issues with different wave shapes, the duration of testing and what diagnostic information can be learned when these VLF voltages are applied. Definitions, acronyms, and abbreviations Very low frequency VLF ac testing IEEE Standards documents are not intended to ensure safety, health, or environmental protection, or ensure against interference with or from other devices or networks.
Implementers of IEEE Standards documents are responsible for determining and complying with all appropriate safety, security, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available for use subject to important notices and legal disclaimers. Overview This guide provides a description of the methods and practices to be used in the application of very low frequency VLF ac high-voltage excitation for field testing of shielded power cable systems Bach [B1]1 and [B2]; Baur, Mohaupt, and Schlick [B6]; Gnerlich [B11].
VLF ac voltage testing is an alternative method of continuous ac voltage testing and is used for a broad range of accessory and cable types Kobayashi, et al. It iede a method of evaluation, and helps to fill the need for more complete information on the cable system condition while minimizing or eliminating some potential adverse charging effects of the direct voltage high-potential test method commonly known as the dc hi-pot test Srinivas and Bernstein [B31]; Eager, et al.
This guide addresses VLF ac voltage withstand and dielectric loss testing in the frequency range from 0. The guide does not focus on the effects of insulation materials parameters: Therefore, caution is recommended in interpretation of results.
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. Normative references The following referenced documents are indispensable for the application of this document i. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments or corrigenda applies.
Cables ,Medium, and High Voltage. Definitions and requirements for on-site tests.
Electrical test methods for electric cables. Test methods for partial discharge measurements on lengths of extruded power cables. Definitions, acronyms, and abbreviations 3. A field test made after cable system installation, including terminations and joints, but before the cable system is placed in normal service.
The test is intended to detect installation damage and to show any gross defects or errors in installation of other system components. A thermoset filled or unfilled polymer used as electrical insulation in cables.
If filled, it is referred to 4400.2 a filled XLPE. A field test made during the operating life of a cable system. It is intended to determine and, for some tests, locate degraded regions that may cause cable and accessory failure. Tree-like growths, consisting of non-solid or carbonized micro-channels, that can occur at stress enhancements such as protrusions, contaminants, voids, or water trees subjected to electrical stress.
The insulation is damaged irreversibly at the site of an electrical tree. A type of thermoset filled polymer used as electrical insulation in cables and accessories. For purposes here, the term also encompasses ethylene propylene diene monomer rubber EPDM. A field test conducted after cable installation but before jointing splicing or terminating or energizing. The test is intended to detect shipping, storage, or installation damage. It should be noted that temporary terminations may need to be added to the cable to successfully complete this test, particularly for cables rated above 35 kV.
Insulation formed in layers typically from tapes of ieee cellulose paper or polypropylene or a combination of the two. It is intended to detect deterioration and to check the serviceability of the system.