Cable faults cost money and create disruption, so there is an enormous demand for cable test techniques to ensure cables and joints are in good condition, and to allow cable faults to be located rapidly. P53 high voltage isolation and access procedures prior to gaining access to hv cable. Set parameters on otdr appropriate for the cable plant being tested range, wavelength, number of averages, etc. If you want to test beyond the cable, what do you need. Performed as a step test cables discharged 4 times test duration after test ieee 400 2012 omnibus ieee guide for field testing and evaluation of the insulation of shielded power cable systems rated 5 kv and above. Wire and cable cold bending test nasacr2010216086 february 2010. Several layers of the soft and friable insulation are. Cable preparation and pulling procedure best practices for. Two or three cable reference may be the only choice.
Neta developed specifications for the acceptance of new electrical apparatus prior to energization and for the maintenance of existing apparatus to determine its suitability to remain in service. A guide to low resistance testing test equipment depot. Astm d4565 15 standard test methods for physical and. Most network specs have been written around a loss test using one cable reference test as does eiatia52614 method b multimode fiber or eiatia5267 single mode fiber. The surest way to weed out bad cables and accessories is to just perform a simple ac hipot test, just like we do with vacuum bottles, arrestors, hot sticks, switchgear bus and insulators, etc. The first neta acceptance testing specifications for electrical power. Utilizing power cables to provide this power transfer capability is a very efficient method with. Ac is therefore recommended in most cable testing standards. If no evidence of distress or insulation failure is observed by the end of the total time of voltage application during the dielectric withstand test, the test specimen is considered to have passed the test. Connection setup for a vlf cable connecting a vlf test instrument to a cable refer to ieee 400.
The choice of testing techniques and procedures for medium voltage cables is now well defined and enables the implementation of effective plans for the proving cable fitness for service. Splicing procedures shall be done as per available fiber optic cable foc splicing instructions or with this procedure. This method works well, so long as there are few splices, joints, etc. Timely conducted testing procedures can help notice the loss of cable insulation integrity, spot signs of its deterioration caused by aging, and therefore prevent. Necafoa 301 standard for installing and testing fiber optic cables 2 figure 2. The following sections of the ansineta standard for acceptance testing specifications for. To test a cable with a megger, you connect one probe to the outside of the cable and, with the power turned off, you touch the probe to the conducting wire at the point of connection. Connect the high voltage test cable to the dc out f post and the ground test cable is connected to ground g post as shown in illustration e. 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. Ac voltage test setup and procedure setup for onesecond and sixtysecond ac voltage test methods.
Also, since the test takes only 5 10 minutes, the cable is not voltage stressed for a long enough period of time for breakdown to occur, unlike a vlf ac hipot test where up to 3 times normal voltage is applied for at least 30 minutes. Tap yl electrical uts with a ho all the way th amage the su s which lie electrical tap s a slick oute erformance. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Standard for installing and testing fiber optic cables. The instructions in this manual and the installation instructions included with the connection kits, control systems. The instrument used for this measurement shall have a. It should be noted that the recommended test time for a withstand test is 30 min. In 1998, iph began to test extruded hv and ehv cable systems after installation. Tests using multivoltage megger insulation testers 42. The hv test lead outside shield conductor is connected to the concentric neutral ground point of the cable under test.
Standard for maintenance testing specifications for electrical power equipment and systems is the most current revision of this document. Ieee guide for field testing of shielded power cable systems using very low. Testing of hv cables supplementary information ergon energy. Astm d456515, standard test methods for physical and environmental performance properties of insulations and jackets for telecommunications wire and cable, astm international, west conshohocken, pa, 2015, back to top. The minimum insulation resistance to earth or between phases shall be 100 megohms.
Both dc hipot testing and vlf testing can meet the needs of laminated paper cables such as pilc and newly installed solid. How much cable is behind the wall, left in the box or coiled up in the back of your truck, closet or. Cable testing revision 1 june 2, 2011 page 3 of 8 procedures to be used as well as the specifics regarding the cable sample. Each manufacturer is required to comply with the same set of tests according to the same test parameters.
Fiber optic system test procedures data systems performance engineering llc performs three tests in order to determine fiber optic cable adequacy. The healthiness of these back charge indicators must be monitored as per standard operating procedure sop standard maintenance procedure smp. Standard for acceptance testing specifications for electrical. The order in which the tests are to be performed is not particularly critical. Insulation testing technical guides megger insulation. This document describes the specification and instruction for assessing the quality and usability of cords and cable. Outside plant osp fiber optic cable installations are typically pointtopoint links with terminations inside buildings and intermediate connections in sealed closures. Inspection and test procedures for lv cables consists of. Original procedure for magnetic particle testing was created 8082016. Sep 26, 2018 a megger is an ohmmeter that measures resistance in the megohm scale. Cable procedures winchester customized interconnect solutions.
High voltage test is done by applying 80% of factorytested voltage. Based on first experiences at 400 kv prequalification tests at cesi. Since 1989, revised editions of the maintenance testing specifications have been published in 1993, 1997, and 2001. Typical test voltage profile for commissioning and recommissioning tests for hv. When vlf withstand testing cable, the proper test voltage and time duration are critical for the success of the test. The device is being used since 1889, popularity raised during 1920s, since long back devise is same in its uses and purpose of testing, few real improvement appeared in recent years with its design and quality of tester. Hundreds of standards including cable testing standards need for cable testing has existed the 1800s. Chapter 8 partial discharge pd hv and ehv power cable. Insulation resistance testing of low voltage cables in the. Yes the cable may fail under test if it has a severe defect, but thats the point of the test. Power frequency 5060 hz dielectric withstand voltage 2. The vlf test instrument should be solidly grounded before connecting up any cables. While doing the hv test the steps to be followed are as below.
The installation test is performed immediately after the cable is buried, and before splices or connectors are added. Vlf cable test voltage ieee standard high voltage inc. The choice of testing techniques and procedures for medium voltage cables is now well. That is, with the same test connections and with the same test voltage applied for the same length of time.
Test voltages shall not exceed 80 percent of cable manufacturers factory test value or the maximum test voltage in table 100. If the tan delta numbers indicate good cable insulation, the test voltage is raised up to 1. If a vlf test is too low in voltage andor too short in duration, more harm than good may result. Typically, the applied test voltage is raised in steps, with measurements first taken up to 1uo, or normal line to ground operating voltage. In 2005, this document was approved for the first time as an american national standard. Connect the opposite end of the test power cable to either outlet of the duplex box. Insulation resistance testing is a nondestructive test procedure. Standard for acceptance testing specifications for. In most cases hipot testing is applied as a passfail or gonogo test. Commissioning tests for hv cables up to 33kv swp ergon energy. Commissioning tests for hv underground cables up to 33kv swp page 5 of standard work practice sp0407 ver 16 ergon energy corporation limited abn 50 087 646 062 this test is required for xlpe and paper lead cables. Cable diagnostic focused initiative cdfi phase ii, released february 2016 62 disclaimer of warranties and limitation of liabilities this document was prepared by board of regents of the university system of georgia by and on. How much cable is behind the wall, left in the box or.
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. Based on the test methodology chosen, refer to applicable standards or manufacturers. Inception of an electrical tree and channel growth time are functions of. Field test procedure for optical fiber link measurements. Test procedure shall be as follows, and the results for each cable test shall be recorded as specified herein.
Launchcable a high quality fiber optic reference jumper cable used for loss testing,attached to a source and calibrated for output power. Cable installation acceptance test the cable installation acceptance test installation test is similar to the cable reel acceptance test except the installation test is conducted from both ends of the fiber. This document will focus only on the tests that are of importance for field installers which are described as installation and maintenance tests. This testing of high voltage hv cables manual has been developed for use by. Power cable installation guide introduction 01 general field practices 01 introduction 01. From the very beginning, powerful mobile resonant test systems as well as the ability to perform sensitive onsite pd measurements were indispensable to test very long ehv cable systems. If the test cable has a defect severe enough at the withstand test voltage, an electrical tree will initiate and grow in the insulation. Megger guide to electrical insulation testing pdf instrumart. The ansineta standard for maintenance testing specifications for electrical power equipment and systems was developed for use by those responsible for the continued operation of existing electrical. The ac test equipment used should have adequate voltampere va capacity to supply the required cable charging current requirements of the cable under test. Insulation resistance testing of low voltage cables in the field. Inspect bolted electrical connections for high resistance using one of the following methods. The following is a summary of insulation resistance ir testing commonly referred to as megger testing of low voltage cables rated less than 5 kv, recognized by nexans. Cable reels shall be shipped and handled on the edges of flanges only.
Distance 250m 500m m 2000m cable size m 11kv or less 400mm2 250 125 60 30 185 240mm2 300 150 75 37. Find here insulation testing and continuity, power protection, power transformer testing, power cable infrastructure, cable fault location, general electrical test. The first neta maintenance testing specifications for electrical power equipment and systems was published in 1975. Guidelines for high potential hipot dc testing of medium. A megger is an ohmmeter that measures resistance in the megohm scale. Raychem xltrace system installation and operation manual for. Low voltage and high voltage cable testing low voltage xlpe distribution cables. Isolation procedure the authorised person shall carry out the necessary isolations, using personal locks, according. Hazard incident reporting notification and investigation procedure. The applied test voltage is raised in steps, with measurements first taken up to 1uo, or normal line to ground operating voltage. Freeze protection and flow maintenance design guide h55838.
The purpose of a withstand test is to verify the integrity of the cable under test. Compare cable data with drawings and specifications. The procedure for vlf testing is nearly identical to that of dc hipot testing and is also conducted as a gonogo test. Low voltage and high voltage cable testing electrical. Also refers to the loss of a cable or cable plant when tested with an optical loss test set. If the cable system does not fail during the test, it is considered to have passed the test and can be placed into or back into service. May 02, 2018 test voltage is applied to the cable while the tan delta test set takes measurements. Cable testing to both predict and then deal with faults is a vital concern for all those involved with the distribution of electricity. Ac hipot tests can only be conducted as gonogo test and therefore may cause extensive damage, should the cable under test fail. The sheath and cable testing supports you in assessing whether a cable system. Hundreds of standards including cable testing standards. Inspection and test plan reference document acceptance criteria verifying document 1. These conditions result in a decrease in the surfacetosurface contact area with an associated increase in surfacetosurface contact resistance, ultimately causing excessive heating at the junction.
Calculation procedure 19 installation in cable tray 20 rollers and sheaves 20 pulling tensions 21. In this video we explain how to check cable insulation with megger or megaohm meter. Link,fiberoptic a combination of transmitter, receiver and fiber optic cable. Very low frequency vlf dielectric withstand voltage 3. Inspect exposed sections of cables for physical damage. Cat6 overview and testing document what is category 6. Insure that the input voltage to the test set is regulated. The category 6 standard is an integral part of the 2nd editions of the iso 11801, tia 568a and en5017. Example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. Make sure that all protective fuses, breakers, switches, etc. Cables shall be tested for insulation resistance with an insulation tester i. Safety operations on medium voltage switchgear author and presenter. Initially there were only two parameters proposed for category 6. All tests made following cable installation and during the warranty period must be performed in accordance with the applicable specifications.
Testing of high voltage cables manual horizon power. Standard for testing specifications electrical power. The test measures the insulation resistance between the phases andor between phase and ground. The complete guide to electrical insulation testing. This document is not intended to be training material for optical testing. The test procedure for performing the cold wirebending test is outlined below. Various cable testing practices are covered in the following documentation. Some ofthe available test methods are listed below. Power cable testing and diagnostics overview testguy. Attach launch reference cable to otdr and to cable plant under test. Procedure h r a 8 power cable aging test procedure iec, nec, nema, fdf, iso ansi, ci, ipcea iec, nec, nema, fdf, iso ansi, ci, ipcea procedure h r a inspection and test plan for power cable before manufacturing activity by no. Performed as a step test cables discharged 4 times test duration after test ieee 400 2012 omnibus.
A routine high voltage withstand test shall be carried out on the completed cables. Weve assembled helpful technical guides on insulation testing from leading manufacturers in the field. An onsite tour of the facility is highly recommended for familiarization and to provide an opportunity for an exchange of technical information. We know we can check any cable or equipment by testing insulation and by. Standard work practice sp0407 commissioning tests for new hv cables up to 33kv defines the procedure and test voltages to be used during a cable test. Unlike earlier cabling standards category 6 is a 200mhz classification.
It is important to recognize that many factors must be considered to properly characterize the test results obtained from any cable testing program. The cable shall be suitable for laying underground with uncontrolled back fill and chances of flooding by water and suitably designed by the addition of chemicals in the outer sheath to be protected against rodent and termite attack. Reel shall be shocked during shipping to prevent damage from load shifting. A wire sample approximately 20 cm in length is initially tested at room temperature. Description of test sources with discussion of tests does not address test results or parameters refers to point documents as definitive reference ieee 400 2012 omnibus ieee guide for field testing and evaluation of the insulation of shielded power cable systems rated 5 kv and above. Perform the test as instructed to make best use of vlf technology. Raychem xltrace system installation and operation manual. This technical article provides general guidelines for high potential hipot dc testing of mv power cables. Switchgear testing and commissioning procedure electrical. Typical test voltage profile for commissioning and recommissioning less than 5 years tests for hv and ehv power cable systems 57 figure 33.
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