In the core material test, you have the insulationinsulation. Field testing of medium and highvoltage cables may performed for various reasons, such as acceptance after installation, charting the gradual. This section specifies the furnishing, installation, and connection of medium voltage cables, indicated as cable or cables in this section, and medium voltage cable splices and terminations. Abb unveils an asset health solution optimizing switchgear efficiency. Dec 28, 2016 one can use a wide variety of tests for medium voltage cables. Vlf cable testing very low frequency is a technique for testing of medium and high voltage mv and hv cables. Dekra tests and certifies your medium and high voltage power transmission and distribution equipment through services, such as type testing, product certification, production supervision, factory acceptance tests, quality assurance, factory inspections and more as part of asset management programs. Checking power capacitor banks for failed capacitors. Highvoltage hv testing with direct voltage dc worked well for the traditional oilfilled power cables with relatively high dielectric losses. This is done to prove the integrity of the cable prior to system energisation thus avoiding a high power failure of the cable when first connected to the system. Testing and commissioning of mvhv cables example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. There are serious concerns about the integrity of u. Insures that the soils properties can support a ground system.
Source type usage for onsite pd testing of mv cable systems. Field testing of medium and high voltage cables may performed for various reasons, such as acceptance after installation, charting the gradual deterioration of insulation over time, verification of splices and joints, and for special repairs. Mv 500 1c cu 15kv epr medium voltage cable southwire mv 40 1c cu 15kv epr. Standard for acceptance testing specifications for. Smart communication energy automation and smart grid. Tranmission communication solutions digital highvoltage station the massive changes within the energy generation structure, caused by infeed of renewables as well as the deregulation of the energy markets, place high demands on the availability, reliability and data throughput of communication solutions of transmission utilities inside and between substations.
Vlf systems are advantageous in that they can be manufactured to be small and lightweight. This method finds the highest voltage the cable can stand before it fails. Acceptance and maintenance testing for mediumvoltage. This section specifies the furnishing, installation, and connection of mediumvoltage cables, indicated as cable or cables in this section, and mediumvoltage cable splices and terminations. Use the kirby risk product search to find products in our extensive products listing. Lowvoltage designsoften those used in industrial settingsare rated to 2,000 v or lower. The pressure being exerted by network agencies, network end customers and distributed network operators is the driving force behind the expansion of a seamless system for monitoring power quality in high and mediumhigh voltage networks.
By identifying the electrical stress points and quantifying their severity, the facility engineer can determine the aging and failure mode that will cause degradation or other damage that, over time, could lead to the ultimate failure of a cable system. Medium voltage primary cables a continuity test, a 2,500 volt dc megger test, high potential testa dc and a second 2,500, volt dc megger test shall be performed on 15 kv primary cables after the cables have been spliced or terminated. Planning and developing a neta acceptance testing program and fundamentals of epm. Medium voltage cable replacement is costly and generally difficult. Class a power quality pq analyzers are used for this per iec 6430.
Ate recommends and performs regular routine maintenance testing of aged cable. Neta international electrical testing association inc. Perform megger and high potential testing on low and medium voltage cables. One can use a wide variety of tests for medium voltage cables. With its extensive technical and engineering expertise and a state of the art compound facility, general cable is committed to using materials with the best overall properties to create the most comprehensive line of industrial power cables to meet your design requirements.
As one of the most trusted resources in the industry, our certification mark for low voltage power distribution products serves as the industry standard for acceptance giving you access to industrial, commercial and residential markets around the world. Cables are designed to carry high earth fault currents comparable with system symmetrical fault currents. Abb improves switchgear efficiency and operational safety with abb ability condition monitoring for switchgear swicom, reducing maintenance costs by as much as 30 percent. These qualification testing include those for jacket material, cv extrusion, core material, thermomechanical, and others. Requirements that apply to all sections of division 26. The pressure being exerted by network agencies, network end customers and distributed network operators is the driving force behind the expansion of a seamless system for monitoring power quality in high and medium high voltage networks. If medium voltage cable is used this requirement is applicable. Software allows detailed reports with infrared images showing points of concern before costly failure occurs. These instruments not only test mv medium voltage and transmission class. Testing and commissioning of mvhv cables example of asbestos paper insulation wrap on high voltage cable inside an underground cable vault. According to okonites guide, its 300 volts per mil, so at 15kv class for acceptance testing.
Acceptance testing is performed to detect any defects in cable. Neta acceptance testing contact the term electrical maintenance refers to a program of regular inspection and service of equipment to detect potential problems and to take proper corrective measures through the approved work process controls. Aug 27, 2012 alfanar testing and commissioning 33,176 views 3. The epm program should be planned and developed to include each of the functions, requirements, and economic considerations described in nfpa 70b, chapter 6, planning and developing an epm program, and nfpa 70b, chapter 7, fundamentals of epm.
Cable testing standards overview of the ieee 400 bundle youtube. High voltage cable testing withstand tests may include a dc withstand or hipot though not to be used on xlpe cables. Mvhv cable testing vlf technology high voltage inc. Home technical articles testing and commissioning of mvhv cables example of asbestos paper insulation wrap on high voltage cable inside an underground cable vault. The test measures the insulation resistance between the phases andor between phase and ground. Medium voltage cable electrical wires cable company. This is the final results from years of study of cable testing. Given below are the tests and inspections that must be done before energizing low voltage cable rated 600v or below. The most basic use of the vlf is to perform a gonogo withstand test to expose defects that cannot hold the test voltage. Accepted industry practice calls for high potential hi pot testing of medium voltage cable to verify the integrity of terminations and splices. Neta atslatest standard for acceptance testing specifications for electrical power equipment and systems.
Unity cables is a leading cable company that provides medium voltage cables. The test increases the voltage until the current increases. Engineering data for copper and aluminum conductor electrical. The values associated with the testing methods shall be in accordance with the applicable table 100. Mediumvoltage cable systems are tested on site for commissioning and for diagnostic purposes. This requires an assessment of the condition of the cable system by understanding the aging mechanisms and also the development of diagnostic tests. Once the cable fails, it is usually damaged or destroyed. These cable solutions include nonshielded type mv90 and copper tape shielded type mv105 designs used extensively in pulp. This publication is a collection of items of general information related to the subject of power cable. Apply voltage in accordance with manufacturers published data. Acceptance and maintenance testing of medium voltage cable. Ever since, all siemens medium voltage drives have been and continue to be rigorously tested and certified to the most current safety standards, including iec, ul and csa. This paper will explore developments in testing and evaluation of medium voltage cable seen over the last 20 years.
Compare bolted connection resistances to values of similar connections. This technical note provides background information on capacitance testing of medium voltage double bushing capacitors commonly used in capacitor banks and harmonic filter banks with rated line voltages greater than 2. Siemens first began arcfaulttesting its medium voltage drives in 1998. In general, acceptance proof test are conducted at 80% of final factory test voltage. The test needs to be capable of detecting and locating problem areas in cable. Leading supplier of electrical test equipment hv diagnostics. Meggering 15kv cables ieee electrical code issues engtips. Dc cable testing is now frown upon as it can accelerate insulation defects which leads to earlier failure of cables both new and service aged. May 05, 2017 this webinar covers new cable testing technologies and the five major standards known as the ieee 400 bundle. Power cable testing and diagnostics overview testguy. Baurs truesinus is a voltage generation technology invented in 1990 and patented in 1995 for the very low frequency vlf high voltage cable test equipment. During the past decade numerous cable manufacturers have changed to this instrument during the modernization of their. Acceptance and maintenance testing of medium voltage cable posted by protec tech team on thursday, march 15, 2012 over the years there have been several methods andor philosophies regarding the testing of underground electrical power cable. Given below are the tests done while cable testing is done.
Perform an insulationresistance test individually on each conductor with all other conductors and shields grounded. At present, numerous high voltage xlpe cable systems with nominal voltages up to 500 kv and. Acceptance and maintenance testing of medium voltage power. Low potential testing of dielectric 37 highvoltage withstand testing 39 timeleakage test 41. Insulation resistance testing is a nondestructive test procedure. As with hv and ehv cables, the icmcompact is used for shopfloor production testing on medium voltage cables and icmflex applications include hvmv cable acceptance testing, mvhv cable onsite testing and cable joints and accessories laboratoryonsite. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Electrical testing for power systems generator testing. Acceptable procedures for conducting hipot testing, although varying slightly in technique, have been standardized as either a withstand test or a timeleaking current test. This technical article provides general guidelines for high potential hi pot dc testing of mv power cables. Nuclear regulatory commission nrc is requiring per reg guide 1. If medium voltage cable is used this requirement is. The epri report begins by stating dc highvoltage testing of cables is.
The wellknown hva control center software comes free of charge with all hva. Guidelines for high potential hipot dc testing of medium. An overview of diagnostic testing of medium voltage power. Three ranges of voltages are available for cables today. Section 8 high voltage proof testing table 8 1 high voltage field acceptance test 52 table 8 2 high voltage maintenance test 53 table 8 3 frequency of proof testing 53 section 9 miscellaneous information table 9 1 jacket materials selection chart 55 table 9 2 decimal equivalents of one inch 56 table 9 3 temperature conversion table 56. Medium voltage distribution equipment testing and certification. Also, routine mainte nance hv tests may be conducted in the field on installed cables as maintenance tests. Tranmission communication solutions digital high voltage station the massive changes within the energy generation structure, caused by infeed of renewables as well as the deregulation of the energy markets, place high demands on the availability, reliability and data throughput of communication solutions of transmission utilities inside and between substations. Ieee guide for field testing of laminated dielectric, shielded power cable systems rated 5 kv and above with high direct current voltage.
Medium voltage drives sinamics electric drives simply. Several layers of the soft and friable insulation are wrapped around the cable in long, wide strips. In this series of 15 blogs we provide chapter breakdowns for the nexans published book, medium voltage cable accessories, a theoretical and practical approach. This webinar covers new cable testing technologies and the five major standards known as the ieee 400 bundle. Dielectric breakdown testing answers the question, how much voltage can i apply between the wires before the insulation fails. What are the parameters used in testing medium voltage cable. Abb introduces unisec with airplus a compact and completely sf6free mediumvoltage switchgear. The continuity test also called low resistance measurement is measuring the low resistance of cables, from 1 m. Feb 26, 2019 accepted industry practice calls for high potential hi pot testing of medium voltage cable to verify the integrity of terminations and splices. Medium voltage drives sinamics electric drives simply my. The high potential test shall be performed at on new cable 45kv. Medium voltage designs range from 2,000 to 35,000 v and highvoltage.
Its 0 65 kv ac output voltage meets world standards for acceptance testing up to 35 kv class cable, and its sine wave output is also suitable for using optional td and pd measurement systems. High voltage proof testing 52 53 high voltage dc field testing 52 dc field acceptance testing 52 test limitations 52 test notes 53 maintenance proof testing 53 frequency of tests 53 section 9 miscellaneous information 54 60 formulas for calculating charging current 54 capacitance of cables 54 insulation resistance 54 jacket materials. Neca neis 6002003 recommended practice for installing and maintaining mediumvoltage cable. After a new cable has been installed and before it is energized, acceptance proof testing hv tests should be performed. The following sections of the ansineta standard for acceptance testing specifications for. Accessory equipment necessary to safely conduct high voltage tests such as. Ieee std 400 provides additional information on dc testing and evaluation of the insulation of shielded power cable systems c. The major differences to the 2004 issue is the recommended testing time to 30 minutes from the previous time of 15 minutes. Acceptance and maintenance testing for medium voltage electrical power cables over the years there have been several methods andor philosophies regarding the acceptance and maintenance testing of medium voltage underground electrical power cable in the field. For maintenance testing for cables less than 5 years old. General cable is recognized as a worldclass leader in the development and design of mediumvoltage industrial cables. Illustration of pd distributed measurement on mv power cable systems. Perform a shieldcontinuity test on each power cable. High voltage xlpe cable systems technical user guide.
In 1996, the insulated conductor industry determined that dc withstand testing of the plastic xlpe insulation systems either in the cable factory as a routine production test or after installation as the higher voltage proof test was detrimental to the life of the insulation and therefore discontinued recommending dc testing. Uls power utility cable testing works directly with utilities to help ensure compliant products and the utilitys needs and specifications are addressed by their suppliers for. Ul 1072latest ul standard for safety, mediumvoltage power cables. 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. Premature failures of the new solid dielectric cables like hmwpe and xlpe. In the absence of manufacturers published data, use table 100. In three phase systems uo is u 3 the voltage of the cable must be chosen according to the maximum voltage um in normal working conditions, which must not exceed the rated voltage by more than 20%. Electrical acceptance tests architecture engineering and. It is not intended to be nor should it be used as authority for design, construction, or use of power cable. The development of high voltage xlpe cable systems goes back to the since then production and material technology have improved significantly, providing reliable and maintenancefree products to the utility industry. Uls power utility cable testing works directly with utilities to help ensure compliant products and the utilitys needs and specifications are addressed by their suppliers for high and medium voltage and non shielded cable. Section 26 05 11, requirements for electrical installations. Though not yet mandatory, arc resistance requirements are right around the corner.
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