Aug 16, 2018 the following tests are type test of electrical power cable. General discussions for field testing of cables testing objectives. Hv cable termination shall be carried out as per approved drawings. Inspection and testing inspection and testing of cables shall be done at manufacturer works. Hipot test is a contraction for high potential hv testing. Technical specification for 112233 kv nominal voltage ht xlpe power cables 1. The method qfl testing of x lpe cable insulation resistance 827. Cable types, design, and associated insulation faults. There are many reasons why a cable may fail in service. Qualification of officers appointed to assist the inspectors 5. 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. High voltage dc cable testing both dc hipot testing and vlf testing can meet the needs of laminated paper cables such as pilc and newly installed solid dielectric cables such as xlpe.
Method statement for installation of high voltage hv. Perform a shieldcontinuity test on each power cable. Autocad format and manuals in pdf format, for offered item shall be. Approximately 12% of cables fail during the test and cable repair can then be done in a planned manner. Electrical control panel, ht panels, lt panels, capacitor. Estimate of weibull distribntton parameters and correlation coefficients of the. The information from this project contributes to energy research and development divisions energy systems integration program.
Testing of electrical power cable type test acceptance. Commissioning test for hv underground cable up to 33kv swp sp0407. Crimped terminations shall be used for cables and pinch screw should not be used. For good insulation, the resistance usually reads in the megohm range. Testing manual for electrical equipment nahed alhajeri 1and anantha madhavan 2 abstract quality assurance qa refers to a program for the systematic monitoring and evaluation of the various aspects of a project, service, or facility to ensure that standards of quality are being met. The values associated with the testing methods shall be in accordance with the applicable table 100. Several layers of the soft and friable insulation are wrapped around the cable in long, wide strips. Very low frequency vlf withstand testing the basics. 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. Cable systems are equipped with accessories, which have passed the relevant type tests pursuant to national and international standards, such as longduration tests.
Megger guide to electrical insulation testing pdf instrumart. 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. This is in contrast to an overhead line, which does not have insulation. This document details powersystems requirements for electrical testing of hv equipment up to and. Simply connect each tester to its corresponding harness connector using snapin adapters, choose one unit to act as the host, retrieve a previously stored wirelist, link the ht 128s together and begin testing. Hv cable earthing shall be done as per local authority regulation, specification and approved drawings. Vlf cable testing very low frequency is a technique for testing of medium and high voltage mv and hv cables. Figure 2typical megger test instrument hookup to measure insulation resistance. Test details levels of control cl requirement test method part no. Several layers of the soft and friable insulation are.
Solar ive allows both testing a singlephase threephase with optional mpp300 photovoltaic system and verifying iv curve. General information on high voltage cable systems 1. Testing of hv cables work will only be performed by individuals who are appropriately trained and qualified in accordance with accepted standards within horizon. Cable section with or without jointtermination 2 no pressure test. The insulation resistance test is typically done on every cable tested and usually done at 300 to 500 vdc with 100 to. However with aging of the latter the insulation is no longer homogenous and defects accumulate. A series of contacts that are connected with wires, resistors, capacitors, diodes, and other components is called a network of connections or net. Jun 07, 2011 low voltage and high voltage cable testing low voltage xlpe distribution cables. Sp0407r01 commissioning tests for new hv cables up to 33 kv job safety analysis sp0407r02 testing hv cables supplementary information sp0407r03. Dec 20, 2016 cable termination kaise kiya jata hai ll 11kv xlpe armoured cable heat. The minimum insulation resistance to earth or between phases shall be 100 megohms.
Evolved with cable and testing technology field tests identified major categories installation acceptance maintenance further divided depending on user needs withstand diagnostic ieee cable testing standards. Oct 14, 2016 11 kv hv cable megger test tamil language. Cables passed a prequalification test on a 400 kv xlpe cable system according to the relevant international standard iec 62067 2001. The cable samples are type tested inhouse to ensure conformance as to various standards. The final stage of hv cable manufacture is the high voltage test, which comprises an hv withstand, and a partial discharge detection test. Pl let us know what is the limit of leakage current while doing hipot test for cable and ht busbar. Ieee guide for the design and installation of cable systems. The complete guide to electrical insulation testing. Ignition coils in motor vehicles function, diagnosis. Regular routine maintenance testing of aged cables has been demonstrated to reduce the chance of unscheduled failure to approximately 10% of the failure rate that might be encountered without such testing. Perform a shieldcontinuity test on each power cable by ohmmeter method.
If performed by means of direct voltage dc, reduce the test set potential to zero and measure residual voltage at discrete. That is, with the same test connections and with the same test voltage applied for the same length of time. Electrical insulation testing of hv equipment up to 33kv. Thanks to remote unit solar02, it is possible to test the system complying with the requirement of simultaneity as provided for by the reference standard. Low voltage and high voltage cable testing electrical. High voltage xlpe cable systems techincal user guide brugg cables page 2. The method of testing of xlpe cable insulation resistance.
Testing of high voltage cables manual horizon power. In general testing of hv cable systems to be used in the swedish national grid shall follow applicable iec standards and cigre recommendations. Solar ive the first multifunction iv curve tracer ht. Individually test each conductor with all other conductors and shields grounded. Of all systems in a hv plant, cable systems must satisfy possibly the widest range of test requirements. In accordance with icea, iec, ieee and other power cable consensus standards, testing can be performed by means of direct current, power frequency alternating current, or very low frequency alternating current. Netaworld online versus offline partial discharge testing for cable assessment 65 figure 1. The following tests are type test of electrical power cable. Qtii and qtiii cold shrink silicone rubber is specifically formulated as a high trackresistant material with hydrophobicity water repelling action to virtually ensure a long life expectancy. The test is sensitive to arcs or corona so it often finds terminal spacing problems, overmold problems, tolerance errors in idc cables, or any problem that might produce arcs. Several layers of the soft and friable insulation are wrapped around the cable in long, wide. Very low frequency vlf withstand testing the basics published on march 3. Testing of high voltage cable systems svenska kraftnat. 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.
Method statement for installation of high voltage hv cables. Compare cable data with drawings and specifications. High voltage xlpe cable systems technical user guide. Relationship between capacitive and resistive currents the ratio of the two currents i r i c is the tangent of the angle. The best method to use can vary based on the cable type and construction and the type of cable fault. Chapter 8 partial discharge pd hv and ehv power cable. Insulation resistance test includes line and neutral together to earth and between live conductors. The megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Low voltage and high voltage cable testing electrical notes. A megger is an ohmmeter that measures resistance in the megohm scale. This test required one year of operation, along with the thermal monitoring of. Compare bolted connection resistances to values of similar connections.
Inspect bolted electrical connections for high resistance using one or more of the following methods. High voltage xlpe cable systems techincal user guide brugg cables page 3 1. This testing showed that there were no identifiable changes to the epoxy resin compound once testing had been completed at higher temperatures. If you are looking for something specific, dont hesitate to contact us. Uniflex cables, has stateoftheart manufacturing facility to manufacture high voltage xlpe cables up to 66 kv on a high precision ccv line from scholzsupermac dry cure dry cool system and royale systems, usa. The instrument used for this measurement shall have a. Operating conditions of cable and system components suitable field tests. It is not intended to be a design document, although many of the problems of installation can be avoided by designing cable layouts within the installation limits of this recommended practice. The purpose of this technical guideline is to provide a general overview of the requirements related to the testing of high voltage cable systems. Use of a lowresistance ohmmeter in accordance with section 1. Ht069xx gecko cable assembly backpotting, temperature test. All test result shall be submitted after meggering of the cables.
Routine tests are performed on each manufactured length of cable in routine test laboratory. The megger insulation tester is essentially a highrange resistance meter ohmmeter with a builtin directcurrent generator. Perform an insulationresistance test utilizing a megohmmeter with a voltage output of at least 2500 volts. Example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. 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. Testing of hv cables supplementary information page 1 of 24 reference sp0407r02 ver 2 ergon energy corporation limited abn 50 087 646 062 1.
The ditmco ht 128 is a distributed cable test system that allows you to connect individual testers to each wire harness branch connector rather than relying on a single, centralized tester and multiple return adapter cables. A tool chest of test equipment options should be onhand to ensure a successful and an expedient fault location exercise. The ht 128 performs continuity and resistance diagnostics for each wire in the harness. 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. If cable routes are guarded with no way of opening them between termination and installation, it is ideal to terminate the cables for the time being, so they can be tested before the routes are protected.
Commissioning test for hv underground cable up to 33kv swp sp0407 field instruction sp0407c01 hv cable commissioning test report form sp0407c04 commissioning tool hv cables up to 33kv. These cold shrink terminations are lightweight for either freehanging or bracket mounting arrangements. Contractor shall take back all the cable drums from site after successful laying, testing and commissioning of cables. This method statement defines the procedure step by step to implement the correct practices for installation of high voltage hv cable in order to ensure that the job execution complies with the project requirements and serves the intended function to satisfactory level.
The instrument used for this measurement shall have. Experienced cable fault location testing personnel. Testing cables with high voltage cirris systems corp. Appointment of officers to assist the inspectors 4b.
The following data has been collated from harwin test report 1884. Weve assembled helpful technical guides on cable testing and cable fault location from leading manufacturers in the field. The supplied length of cable is not sufficient to perform the intended job, e. Home technical articles what is hipot testing dielectric strength test. A highvoltage cable hv cable is a cable used for electric power transmission at high voltage. The sheath and cable testing supports you in assessing whether a cable system is safe and ready to operate.
Cables shall be tested for insulation resistance with an insulation tester i. Low voltage and high voltage cable testing low voltage xlpe distribution cables. Introduction ht power cables, lt power cables, ht xlpe. In ht aerial bunched cables the phase conductor consists of stranded circular compacted aluminium conductor, conductor screened with extruded semicon compound, insulated with cross linked polyethylene xlpe, insulation screened with extruded semicon compound followed by copper tape or plastic coated aluminium tape, outer sheathed with pvc or black weather resistant polyethylene and three such. Testing wave shape and frequency are the same as the service voltage. Ht aerial bunched cable, ht aerial bunched cable manufacturers. Fault analysis in underground cables is the final report for the underground cables project, contract number 500. Vlf systems are advantageous in that they can be manufactured to be small and lightweight. At present, numerous high voltage xlpe cable systems with nominal voltages up to 500 kv and with circuit lengths up to 40 km are in operation worldwide. This passes through the ignition cable to the spark plugs spark gap and ignites the fuelair mixture in a sparkignition engine. Inspect exposed sections of cables for physical damage. 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. Very low frequency vlf high voltage test set for xlpe cables dc high voltage test set for paper lead. Practical hv cable jointing and terminations for engineers.
The amount of high voltage induced depends on the speed of change in the magnetic. Distribution of maximum apparent charges in the specimens. Commissioning tests for hv cables up to 33kv swp ergon energy. Ieee guide for the design and installation of cable systems in substations.
A guide for installing, splicing, terminating, and field proof testing of cable systems in industrial and commercial applications is provided. Highvoltage cables of differing types have a variety of applications in instruments, ignition systems, and. What happens when you test something more complicated than just contacts. Testing a contact in this fashion makes sure it is isolated from all other contacts. Raise the conductor to the specified maximum test voltage and hold for 15 minutes. A cable includes a conductor and insulation, and is suitable for being run underground or underwater. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Testing and commissioning of mvhv cables example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. Withstand and diagnostic field testing of medium and high voltage cable is now practical using hvi vlf technology along. Technical specification of ht cables for power stations installed. Cable failures cables damaged after installation a tap into an existing cable tee or wye splices. Termination type selection guide for 3m three conductor cable 7600 series kit series insulator con.