Analytical expressions for calculating the electric field distribution at high voltage cable terminations under ac test voltage have been derived and discussed in our previous manuscripts 17, 28. A key to good cable preparation is the use of sharp, high quality tools. A high voltage insulated cable circuit consists of three singlecore cables or one threecore cable with high voltage sealing ends at each end. High voltage systems air bagtm cable system real time monitoring systems rtms system solutions and innovation prysmian cavi e sistemi energia srl viale sarca 222, 20126 milano, italy tel. They provide a completely shielded, deadfront, fully submersible cable connection for mediumvoltage apparatus, including transformers, switchgear and large motors. Technical note voltage cable splicing and cable termination. Inspect bolted electrical connections for high resistance using one of the following methods. The current carrying components are made of copper or aluminum. Mv cable accessories installation best practice pdf ensto. When advancing the saw, be sure to maintain a straight line by cutting along the high point of. Pdf the ultrahigh frequency partial discharge detection method described in the paper is successfully applied online to assess the insulation. Highvoltage test techniques partial discharge measurements as 62271.
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. The copper wire screened cable is 12 kv, 150 mm2 stranded aluminium. For this reason it is common practice to cut off a portion of cable after pulling to assure an undamaged end. These sealing ends are also called terminations or terminals. 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. The cable termination was accompanied by the associated bracket and lightning arrester, both of which were damaged.
Requalification testing is carried out on a regular basis with installed components. Terminations for extruded high voltage cables are traditionally made with a supporting insulator porcelain or composite, a premoulded rubber stresscone slip on. When a high voltage cable is terminated for a connection to a circuit or equipment in a substation or switchyard, the termination must also be made to exact specifications. Raychem medium voltage termination hvt 5 kv 35 kv broad range of standard indoor and outdoor kits for all plastic cable types, including armored cable easy installation with a single technique which eliminates retrainingeven on armored cable hvt erminat tion emt sys may be installed upright or inverted and can bend. Mediumhigh voltage cable preparation it is necessary to begin with a good cable end. Nov 24, 2017 this video will show you various steps that are involved in medium voltage mv cable termination. When the length of the circuit exceeds the capacity of a cable reel, joints are. The high voltage cable terminal 67 8 is an indispensable accessory for connecting other electrical equipment when high voltage cables are laid.
The shield must be grounded for the cable to perform these functions. This section covers mediumvoltage cable and terminations for use in the universitys primary and secondary power distribution systems. Simply pull out the support core and allow the termination to shrink in order to create a tight void free interface between the termination and the cable. The cable termination, the lightning arrester, and the bracket were visually examined for general condition, and the termination was examined for any construction anomalies. These cold shrink terminations are lightweight for either freehanging or bracket mounting arrangements. Medium high voltage cable preparation it is necessary to begin with a good cable end. High voltage cable terminations heatshrinkable terminations ihvth ohvth lhvth 10 heatshrinkable terminations for dc filter cables fcev 14. Heat shrink, cold shrink, pushon and slipover cable accessories enable the jointing, terminating and connection of 11kv33kv and. The range of voltage and capacity of power transmitted through cables is showing a steady increase over the years. Cable layout and system design the dimensioning of a high voltage cable system is always based on the specifications and demands of the project at hand. High voltage electrical system 750v technical safety bc.
This video will show you various steps that are involved in medium voltage mv cable termination. Raychem high voltage cable accessories up to 245 kv. The elaspeed terminations shrink evenly on the cable as the inner support core is removed. High voltage connectors cable services group, cable.
Pdf design of cable termination for ac breakdown voltage tests. Customers can therefore have full confidence in the products, services and data. Hv cable joints terminations high voltage 11kv 33kv heat. Prysmian has developed a quick and easy splice for single and three conductor airguard cable. Practical hv cable jointing and terminations for engineers. High voltage cable preparation it is necessary to begin with a good cable end. Mirzahan hizal january 2005, 74 pages the terminations and the joints are the basic accessories of the power cables.
Qtii and qtiii cold shrink silicone rubber is specifically formulated as a high track resistant material with. Pdf design of cable termination for ac breakdown voltage. Power cables require electrical stress control when terminated. Sps high voltage cable joint kits are designed and tested to bs7888 and cenelec hd 628 s1 and hd 629 s1 hv cable joints kits are available to joint xlpe, pilc, picas, epr and triplex high. When the various layers are removed, cuts should extend only partially through the layer. This publication is a collection of items of general information related to the subject of power cable. 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. Keeping up with their demands means ensuring your highvoltage cables are performing at peak condition in rain, shine or anything else the climate throws your way. Raychem heatshrinkable terminations for filter cables dc fcev raychem switchgear terminations shvt raychem transformer terminations thvt raychem three piece joint raychem link boxesaddon kits for hv cable accessories voltage page 145 kv 17 voltage page 52 kv indoor 19 52 kv outdoor 20 72 kv indoor 21 72 kv outdoor 22 72 kv long creepage 23. 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. Provide a ground path for leakage and fault currents.
Cable services stock the tyco high voltage connectors for 145kv outdoor terminations. The fault was located right in the boundary of the stress grading of the termination and the semicon layer of the cable. Rated voltage u kv 60 69 110 115 2 8 rated lightning impulse withstand voltage bil kv 325 550 650 partial discharge measurement pc termination is designed for voltage classes up to 145 kv and to operate under severe environmental conditions. Medium voltage mv accessories catalog prysmian group. The cable is fed from the bottom of the reel so that its curvature is continuous with no reversed bends. This group of high voltage elbow terminations is the c phase in the inground vault.
Wire, cable, and terminations wct 1design guidelines and standards basis of design this section applies to the design and installation of wire and cable systems and terminations. The following details are required for calculation. When the various layers are removed, cuts should extend only partially. Our cold shrink terminations offer a reliable sealing solution for medium and high voltage applications, and are simple to install even in confined work areas helping you save time and money. High voltage withstand testing 39 timeleakage test 41. Iec xlpe cable systems specified according to iec international electrotechnical commission are among many other standards accepted. Obtain a symmetrical radial distribution of voltage stress within the dielectric 3.
Another common method is heat shrinkable stress control tubing that is used to control high electrical stresses at insulation screen terminating point in medium voltage plastic and paper insulated cable joints and terminations up to 36 kv. Terminations to indoor switchgears, electric motors, power transformers, instrument transformers and other electrical mv and hv mv. High voltage xlpe cable systems technical user guide. Pdf onsite condition assessment of hv cable terminations in. May 14, 2014 sps high voltage cable joint kits are designed and tested to bs7888 and cenelec hd 628 s1 and hd 629 s1 hv cable joints kits are available to joint xlpe, pilc, picas, epr and triplex high. Deadbreak connectors fully submersible cable connection. Terminations making permanent connections between cable and electrical equipment or overhead. Highvoltage withstand testing 39 timeleakage test 41. Ordering instructions select the part number corresponding to both the system voltage and the cable insulation diameter in mm. Prysmians patented airguard cable is a superior alternative for ccw type armored cables. Dirt and dust combined with moisture on the surface of high voltage termination elbows in some instances can cause high voltage tracking over the insulated parts which can also cause a failure of the terminations resulting in a fault to ground or a fault to one of the other phases. If this is not done, the termination could become a weak point in the circuit.
Power cable joints and terminations up to 245 kv transition joints link boxes and sheath voltage limiters cable end caps. Sep 08, 2014 the range of voltage and capacity of power transmitted through cables is showing a steady increase over the years. Method statement for installation of high voltage hv cables. As part of its continuous commitment to innovation prysmian. Figure f2 cable feed into conduit at floor level c from cable reel to cable tray, the cable is fed from the top of the reel to maintain required curvature. All raychem high voltage cable accessories products are subjected to extensive testing from the time they enter our plants as raw material until they leave as finished products. It is not intended to be nor should it be used as authority for design, construction, or use of power cable. Compare cable data with drawings and specifications.
When the various layers are removed, cuts should extend only partially through the. High voltage underground transmission cable systems. Proper performance of these steps is described in detail in section 2. The complete itk termination kit comprises the following components. High voltage xlpe cable systems techincal user guide brugg cables page 6 2. Te splicing and termination of underground electrical distribution cable requires that the integrity of cable conductor and insulation be maintained. They also control the high stresses over the connectors in joints. For this reason, it is common practice to cut off a portion of cable after pulling to assure an undamaged end. High voltage termination hvtz for shielded cables coextruded onepiece termination builtin stress control as an option, the hvtz can also be ordered with tes new line of aluminum shearbolt terminals. The highvoltage cable terminal 67 8 is an indispensable accessory for connecting other electrical equipment when highvoltage cables are laid. Method statement for installation of high voltage hv. When the length of the circuit exceeds the capacity of a cable reel, joints are used to connect the unit lengths. Root cause failure analysis of termination and cable. Review and modify the attached guide specification as required to meet the project requirements.
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