General information on high voltage cable systems 1. Introduction this reference is intended to give a basic overview of insulating materials that can be used during high voltage withstand testing, in particular cable testing. High voltage cables have a metallic sheath, along which a voltage is induced as a function of the operating current. In addition we are producing and using our own raw material which will allows us to optimize the material properties perfectly based on our customer needs. Switchgear testing and commissioning procedure electrical. Acceptance and maintenance testing of medium voltage power cables part 1.
The following sections of the ansineta standard for acceptance testing specifications for. Vlf ac voltage testing methods utilize ac signals at frequencies in the range of 0. Hvi offers some the most reliable and easy to use tools for assessing cable health in addition to the vlf withstand test. Typical test voltage profile for commissioning and recommissioning tests for hv and ehv power cable systems using joint hopping or daisy chain pd measurement. Commissioning test for hv underground cable up to 33kv swp sp0407. The basic principles of cable jointing and terminations construction of electrical power cables, different types of cables for various voltage ratings and manufacturing aspects different types of connectors and connection methods different. High quality installation work performed by abb certified field personnel is essential for achieving the low. Hundreds of standards including cable testing standards need for cable testing has existed the 1800s guided ieee 400 series bundle standards ieee cable testing standards.
Generally, vlf withstand testing calls for testing the cables up to 3u 0, where u 0 is the rated phase to ground voltage. Investigations on dac and vlf performance showed less efficiency compared to ac 5060 hz voltage testing 15,16,17 and led to the cigre. All tests made following cable installation and during the warranty period must be performed in accordance with the applicable specifications. Several layers of the soft and friable insulation are wrapped around the cable in long, wide strips. High voltage test is done by applying 80% of factorytested voltage. Hvi offers some the most reliable and easy to use tools for assessing cable health in addition. Electrical insulation testing of hv equipment up to 33kv. From testing devices with ac or dc voltage, from low to high voltage, con. The major application is for testing solid dielectric cable per ieee 400. In general testing of hv cable systems to be used in the swedish national grid shall follow applicable iec standards and cigre recommendations. Costoptimised maintenancethrough cable diagnostics 3 wide range of devices for testing and diagnostics baur offers you products that make it possible to quickly and reliably perform cable and cable sheath testing and condition evaluation diagnostics. Method statement for installation of high voltage hv cables. The tests specified within this procedure are the mandatory minimum requirements.
Quantitative information were derived from dc tests mainly the. It is important to recognize that many factors must be considered to properly characterize the test results obtained from any cable testing program. Chapter 3 hv and ehv cable system aging and testing issues. Oct 14, 2016 11 kv hv cable megger test tamil language. Calls out 12 of iec 6084062067 type test on cable systems, but with the high temperature tests to be performed. Pdf hv onsite testing on cables by alternating voltage of. Cable testing covers many topics and a broad range of testing methods and equipment, including diagnostic methods of insulation testing such as tan delta assessment and partial discharge detection.
Testing of high voltage cables manual horizon power. Chapter 8 partial discharge pd hv and ehv power cable. Commissioning tests for hv cables up to 33kv swp ergon energy. This technical article provides general guidelines for high potential hipot dc testing of mv power cables. Withstand and diagnostic field testing of medium and high voltage cable is now practical using hvi vlf technology along with. However, there is a risk that the cable may be understated due to a combination of lower test voltage and allowed uncertainty of the measuring circuit. While doing the hv test the steps to be followed are as below. Cables passed a prequalification test on a 400 kv xlpe cable system according to the. Standard for acceptance testing specifications for electrical. The values associated with the testing methods shall be in accordance with the applicable table 100. It may be prudent in certain circumstances to pressure test the cable section prior to connection to the system where it is considered appropriate to do so. Chapter 8 partial discharge pd hv and ehv power cable systems.
For example, a minimum test time of 30 minutes is recommended for aged cable circuits. May 02, 2018 vlf testing is not only used for testing solid dielectric cable, any application requiring ac testing of high capacitance loads can be tested using very low frequency. Hv onsite testing on cables by alternating voltage of variable frequency. Test hv ug cables up to 33kv confined space awareness note. Cable diagnostic tools minimize inservice failures. Guidelines for high potential hipot dc testing of medium. Before moving on to the main hipot testing techniques, it is important to introduce the basic information on power cables, namely their types and typical structure. Raise the conductor to the specified maximum test voltage and hold for 15 minutes. Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. Abb xlpe land cable systems 5 design, installation and testing installation of xlpe cable systems installation of cable systems includes trenching, cable pulling, clamping of cable, cable splicing as well as mounting of accessories. Documentation hazchat onsite risk assessment sp0407r01 commissioning tests for new hv cables up to 33 kv job safety analysis sp0407r02 testing hv cables supplementary information sp0407r03. Need some advise on doing some end to end phasing test on 3km 110kv cable, the cable impedance is 34ohms, one end of line is overhead and it then goes underground and going overhead again, overhead cable one side is about 3km then undergrond of 3kms and overhead again for 30kms, can we use a generator to inject current into this cable. This testing of high voltage hv cables manual has been developed for use by horizon power employees and service providers engaged to perform construction and.
Vlf testing times should last between 15 and 60 minutes, depending on the age of the circuit and what type of test is conducted. Testing of electrical power cable type test acceptance. Additional testing may be required depending upon projectsite conditions. Various cable testing practices are covered in the following documentation. Testing wave shape and frequency are the same as the service voltage. From testing devices with ac or dc voltage, from low to high voltage, con dition evaluation. Electrical, mechanical and thermal design of high voltage cable accessories and respective connectors. Testing of high voltage cables manual horizon power 1st edition february 20 prepared by field practices. Ac resonant test systems for onsite testing and offline. Testing of hv cables supplementary information page 1 of 24 reference sp0407r02 ver 2 ergon energy corporation limited abn 50 087 646 062 1. Staff performing hv cable testing should complete this training if not competent. Hv and lv single core cables shall be laid in trefoil groups with 150 mm clear spacing.
Hv routine test fields for extruded power cables n complete solutions including comprehensive technical support n reliable performance for even the highest cable ratings and testing levels n highest pd measuring sensitivity n power upgrades for testing of even ultralong power cables 9. Very low frequency vlf high voltage test set for xlpe cables dc high voltage test set for paper lead. Example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. Of all systems in a hv plant, cable systems must satisfy possibly the widest range of test requirements. Persulphate test for copper annealing test for copper tensile test for aluminium wrapping test for aluminium conductor resistance test for all test for thickness of insulation for all measurement of overall diameter where specifiedfor all physical tests for for. Ieee guide for the design and installation of cable systems. The purpose of this technical guideline is to provide a general overview of the requirements related to the testing of high voltage cable systems.
Testing and commissioning of mvhv cables example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. Compare bolted connection resistances to values of similar connections. Hv type testing extrudeddielectric cable systems for north. Mediumvoltage cable systems are tested on site for commissioning and for diagnostic purposes. Cable testing and diagnostics are various techniques used to help assess the overall insulation quality of medium voltage cable systems, such as withstand testing, tan delta testing, and partial discharge testing. For doing r phase the other phases are shorted and earthed. Testing of hv cables work will only be performed by individuals who are appropriately trained and qualified in accordance with accepted standards within horizon. Several layers of the soft and friable insulation are wrapped around the cable in long, wide. Vlf cable test voltage ieee standard high voltage inc. Highvoltage hv testing with direct voltage dc worked well for the traditional oilfilled power cables with relatively high dielectric losses. Type testing in practice in north america to date, it would seem that most north american utilities require type testing in accordance with aeic cs9 6. They are terminated and joined together by accessories to constitute a cable system. If performed by means of direct voltage dc, reduce the test set potential to zero and measure residual voltage at discrete. This document details powersystems requirements for electrical testing of hv equipment up to and.
Actually, both alternative test voltages are not in accordance with iec standards for afterinstallation tests of extruded hv ehv cable systems. Aug 16, 2018 the following tests are type test of electrical power cable. Electrical insulation testing of hv equipment up to 33kv sub026 issue no. Several layers of the soft and friable insulation are. High voltage xlpe cable systems technical user guide. Testing of high voltage cable systems svenska kraftnat. Kinectrics has tested more than 6,500 km of hv cable rated 66 kv and above. Onsite hv cable commissioning testing with kinectrics mobile resonant test system rts kinectrics variable frequency resonant test sets are capable of performing postinstallation tests on transmission class xlpe cables. Documentation hazchat onsite risk assessment sp0407r01 commissioning tests for new hv cables up to 33 kv job safety analysis. Pdf hv onsite testing on cables by alternating voltage. General discussions for field testing of cables testing objectives. Even if a utility doesnt adopt vlf for widespread cable testing, one of the best reasons to use vlf is to.
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