Among two special highlights of the ehv cable technology, one of the longest 500 kv cable systems. Extra high voltage ehv cables the stateoftheart ehv cable plant with german technology manufactures cables up to 220kv. Continuous vulcanizing are the best machinery for insulating the hvehv cables applying the. A braid is the standard coaxial cable outer conductor. Description as per eil technical specification unit gtg07 bay transformer 220kv gis bay grid transformer01 220kv gis bay grid transformer02 stg01 bay transformer 11kv cpp aux. 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. Elmeridge cable services have developed a strong and close relationship with two of the leading manufacturers of high voltage cable systems. Evolutions and trends inin a changing operating environment reinhard schroth pirelli berlin chairman of cigre sc b1 good afternoon, ladies and gentlemen. High voltage xlpe cable systems technical user guide. When contact is made, the valve will open the humidity section to max. Ehv power cable systems iljin electric printed in korea 2015. Cable designers guide how to specify cable insulated conductors specify quantity, gauge, stranding and insulation type for the conductors. When the length of the circuit exceeds the capacity of a cable reel, joints are used to connect the unit lengths.
The 400 kv cables may be delivered in lengths of 800 to 900 meters, lower voltage cables may be longer. Market study reports reveal that within just a few years the ehv cable. Chapter 8 partial discharge pd hv and ehv power cable. In urban areas, high voltage underground cables are commonly used for the transmission and distribution of electricity. The selection and performance of insulated cables in electrical grids is a vital part of electric power transmission, but is often neglected in favour of a focus on technological construction. To do what the ev htb enables the user to spread and to tear off the outersheath with its aluminium shield previously cut and scored making possible the positionning of the ega to spread and remove the outer sheath. Pdf lightning overvoltages in hvehv mixed overheadcable. Ehv ac undergrounding electrical power springerlink. Xlpecables the manufacture of ehvxlpe cables using horizontal technology has now been perfected and is reliable. Single core cables can be laid in flat or trefoil formation as shown in figures. A is not the most suitable for hv ehv cables, due to their. Ehv ac undergrounding electrical power discusses new methods of analysis for cable performance and for the network behaviour of cable, mixed and overhead. Ehv power cable systems power cables cable accessories. Such high voltage cables have metallic sheaths or screens surrounding the conductors, andor armour and metallic wires surrounding the cables.
In addition, we provide field technical services such as jointing, hydraulic and testing. Cables are among the investment goods with a high service life of over 40 years. New transmission line systems must be designed, constructed, operated and maintained with maximum efficiency and flexibility. This paper describes the standards applicable to ehv cables, but also gives a good overview of documents created by cigre working groups, which are supporting people that are dealing with. Among two special highlights of the ehv cable technology, one. It convinces by precise and reliable measurements of concentricity, wall thickness, diameter and ovality as well as by controlling cables with up to three layers. They exceed the requirements of our customers technical specifications while meeting international standards like iec 60840, iec 62067, icea s108720, and aeic cs9. Cable division head office factory website iljin family 12f iljin building 45, mapodaero, mapogu, seoul, 121716, korea i tel. After extruded cables had already proven their excellent service performance for several decades in the medium mv and high voltage hv ranges, great efforts were spent since the 1980s in the development of synthetic cables for ehv applications, the main challenge being associated with high electrical stresses in cables and accessories. The paper deals with very long ehv cables say, over 30 km and their application in ehv mixed lines, i. Readers are encouraged to consult the link below for the version of this chapter with the most recent release date. Today there are more than 1,000 xray 8000 systems at customer locations worldwide assuring online quality control. Chapter 8 partial discharge pd hv and ehv power cable systems.
Read cable systems for high and extra high voltage online, read in mobile or kindle. Universal cables ltd, the pioneer of xlpe cables in india, manufactures extra high voltage ehv xlpe cables in the range of 66220 kv using vertical continuous vulcanising vcv technology in technical collaboration with world leader in cable manufacturing, furukawa electric co. At its new plymouth factory, nexans olex produces a wide range of electrical power cables, ranging from building wires and control cables to power cables with rated voltages up to 35 kv. During the past decade numerous cable manufacturers have changed to this instrument during the modernization of their. The cable corporation of india cci was the first company to make the country acquainted with the ehv technol. Presentation overview of ehv cables inno consulting. The trend in the ehv cable market, as it is today, reflects two things. For extruded xlpe cables, joints can be directly buried in a trench approx m long and 3m wide. Lightning performance of long mixed overheadcable ehv lines. The accessories of high voltage hv and extra high voltage ehv cables are usually also pretested.
As is the case with most segments of the electrical equipment industry, the cables industry also is a victim of disarray and irregularities at the lowestend of the product segment, which is the ubiquitous lowtension wire used in home and building wiring. In some cases a concrete vault may be necessary for special requirements, i. Based on experiences made on more than 1,300 km underground ehv xlpe cables, the technical solutions and concepts for development, manufacturing, assembly, testing and operation have been largely confirmed. Complete solutions for hv and ehv underground cables. New plant for extra high voltage cables at jeddah cable company moving one step further in its horizontal expansion, jeddah cable company and energya cables saudi arabia has recently deployed the new extra high voltage ehv plant in rabigh industrial area getting operational from the month of june20. Dow endurance hfdb4201 sc and ehv are superclean compounds with accompanying superclean packaging and logistics solutions that help assure the delivery of clean compounds to cable manufacturers. Ev htb hv and ehv cables outer sheath and shield splitters. The two cables from the ehv are routed to a singlepole switch. The indian companies are in the process of expanding their technical capabilities the country has started to look beyond the present, to the longterm cost advantages and efficiency of ehv cables. Pdf lightning overvoltages in hvehv mixed overhead.
This tb explains the reasons for this dramatic change and have provides. Complementing this range is a wide selection of power and datacommunications cables manufactured by other nexans factories around the world. Clean material handling and precise temperature and pressure monitoring during extrusion, dry curing and cooling guarantee a high standard of quality during manufacture. Vcv line at ucl, satna unistar ehv xlpe cables the main cutting edge features of this technology are. Latest trends and best practices in hv and ehv cables system. A high voltage insulated cable circuit consists of three singlecore cables or one threecore cable with high voltage sealing ends at each end. Since the terminal test has a visibility over the entire cable system, only one short voltage application is needed. Ehv power can provide a full range of engineering, procurement, construction, maintenance and repair services for various underground power systems. Due to the high stress levels that hv and ehv cables are subjected to, the cleanliness of insulation is crucial to the cables longevity.
High voltage hv and extra high voltage ehv cables, performing tests with different configurations to analyze the influence of the arrangement of the cables on the spread of a fire, given that it is considered that the test standardized in iec 60332322 cat. Cutting edge features of vcv technology vcv line at ucl, satna unistar ehv xlpe cables the main cutting edge features of this technology are. Xlpe cables the manufacture of ehv xlpe cables using horizontal technology has now been perfected and is reliable. During earth faults applied to directly earthed systems, these metallic paths. High and extra high voltage cables single core copper conductor, xlpe insulated, copper wire screen and hdpe sheathed 38 66 72. Download cable systems for high and extra high voltage ebook free in pdf and epub format. However, mechanical forces during the laying, hidden imperfections, and flaws caused by improper handling, for instance, require partial discharge commissioning tests. Ehv power cables division excalon is highly experienced in the design, installation and jointing of power cables.
My name is reinhard schroth and i am coming from berlin in germany. The installation of long stretches of ehv underground cables could circumvent some of the problems experienced in building new overhead lines, possibly in the socalled mixed lines. Humiditycontrolled air extraction unit overridden by an external onoff switch. By providing world class cable networks in the power industry, we have also been playing a pivotal role as the backbone of a nations key industries. New plant for extra high voltage cables at jeddah cable. I have been busy with the development of hv and ehv cables with. Thermal monitoring can indicate, for instance, a change in the surroundings of the cable, for example if the back filling has been changed or removed, or soil or garden waste has been dumped on top. High voltage xlpe cable systems techincal user guide brugg cables page 4 selection process of cable design.
Through these partnerships, we can provide a range of high voltage cable solutions for xlpe cable systems, oil filled cable systems and gas filled cable systems at 33kv. Today however, we are seeing many underground or subsea cable circuits being established which are 50 150 km in length. Ehv cables in india and the market potential the introduction and development of ehv cables in india was a relatively delayed phenomenon. The service life of a cable is defined as its operating time. These sealing ends are also called terminations or terminals. Conductor the conductor shall be formed from plain copper or aluminum, basically of 2 types, compacted circular and segmental compacted circular. Consistently executing works proficiently and without issue, we are dedicated to achieving 100% customer service, safely, on time, in program and within budget. True simultaneous triple extrusion with single common cross head conductor screen, insulation and insulation shield applied in single process. High and extra high voltage cables with synthetic insulation. We also offer total turnkey solution for extra high voltage ehv cables which includes manufacturing, testing, supply of cables, supply of cable accessories, installation of cables and accessories, testing and commissioning. Even a few years ago, the domestic competency was restricted to low and medium voltage cables. Excalon provides a comprehensive power cables service which is undertaken by a dedicated ehv power cables division comprising designers, saps, cable installers and jointers all with appropriate accreditations and qualifications. With options including watertight design, corrosion and moisture resistance, longdelivery lengths and protection against rodents and aggressive chemical.
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