Pdf water ingress in highvoltage crosslinked polyethylene. Cable cabinet with possibilities to joint and toff 12 24 kv xlpeinsulated cable above ground. This technical article provides general guidelines for high potential hipot dc testing of mv power cables. This could be a connection to switchgear, a transformer, an overhead line etc. Preinsulated twiston type shall be permitted on solid conductor size no. The techniques described within the manual have been designed and developed for the. The document describes safe working practices on high voltage hv cables and pilot cables. Method statement for installation of high voltage hv. Since about 1960, all distribution class cables made with pe polyethylene, xlpe cross linked polyethylene or epr rubber since about 1990, most transmission class cables up to 230 kv made with epr or xlpe cables have splices along its length and terminations at each end. Chapter 3 hv and ehv cable system aging and testing.
Ns177 11kv joints including transition joints and terminations polymeric insulated cables amendment no 1 nw000s0101 uncontrolled if printed page 2 of 107 issue for issue to all ausgrid and accredited service providers staff involved with the high voltage cable jointing work, and is for reference by field, technical and engineering staff. Test procedure shall be as follows, and the results for each cable test shall be recorded as specified herein. Abb xlpe land cable systems 3 introduction interfaces you can trust abb manufactures land and submarine power cables up to the highest voltages available. These cold shrink terminations are lightweight for either freehanging or bracket mounting arrangements. Pdf in norway, there are 6000 to 7000 oilfilled highvoltage cable terminations in the transmission network, most of which are constructed. The table below has the earth fault duty of the hv cables used by ergon energy. When the various layers are removed, cuts should extend only partially through the layer.
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. Indoor terminations protected from exposure to the weather and uv radiation outdoor terminations exposed to the weather and uv radiation. Euromold provides a complete range of accessories for underground cables. 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. Verify that visible cable bends meet or exceed icea and manufacturers minimum published bending radius. Each component is vital to an optimally performing power cable and must be understood in order to make a dependable splice or termination. Insulation displacement connection idc termination is the recommended method of copper termination recognized by ansitiaeia568a for utp cable terminations. The cables need to be also terminated at sending and receiving end equipment, a very wide variety of them, in utility as well as industry applications and this calls for appropriate cable termination accessories. These limits should not be used for cables subjected to pulling tensions during installation. Furthermore, we produce associated joints, terminations and other accessories for all types of cables. The recommended minimum testing time for a simple withstand test on aged cable circuits is 30 min at. Cable terminations and joints form the weakest link in any distribution system. Power cable installation guide figure f5 multiple sheaves figure f6 sheave arrangements for feeding into cable tray training radius the training radius is the final positioning of cable ends after the cable has been placed in the raceway. A high voltage insulated cable circuit consists of three singlecore cables or one threecore cable with high voltage sealing ends at each end.
The cable end seals shall be checked after laying and if found damaged shall immediately be resealed. When the length of the circuit exceeds the capacity of a cable reel, joints are used to connect the unit lengths. All tests made following cable installation and during the warranty period must be performed in accordance with the applicable specifications. Insulation resistance of hv cable should be checked by using 5 kv megger after installation and before termination of cables and readings shall be submitted to the consultant. Medium voltage underground cables 4 cable l cable power circuit design 7 n conductor 78 n conductor screen 8 n insulation 8 n insulation screen 89 n metallic screen 910 n outer protective sheath 1011 l table of cable elements 12 l cable constructions l cable drums 14 l cable tests following production 15 accessories l introduction 16 l connectors and lugs 16. High voltage cable joints heatshrinkable joints ehvsh 46 one piece joints ehvss 48 three piece joints ehvst 51 fibreoptic addon kit for hv cable joints 54 iv. Screened separable connectors for terminating cable to equipment via standardised equipment. Highvoltage test techniques partial discharge measurements as 62271. Transformer installation method statement electrical. Hv cable joints terminations high voltage 11kv 33kv heat. High voltage xlpe cable systems technical user guide.
Wire, cable, and terminations november 2004 design guidelines and standards 3wct splices 600 volt. Testing of high voltage cables manual horizon power. They are terminated and joined together by accessories to constitute a cable system. The basic principles of cable jointing and terminations construction of electrical power cables, different types of cables for various voltage ratings and manufacturing aspects different types of connectors and connection methods different methods. Lesson six proper cable termination practices are vital for the complete and accurate transfer of both analog and digital information signals. Therefore, this paper presents a procedure for designing cable terminations to. A key to good cable preparation is the use of sharp, high quality tools.
Vlf cable test voltage ieee standard high voltage inc. The width of the cable trench shall be maintained minimum 800 width and mm depth according to the number of cables for buried cables. Raychem heatshrinkable medium voltage terminations ixsu. This video will show you various steps that are involved in medium voltage mv cable termination. Purpose this document supports the power system safety rules and its requirements assembled under high voltage transmission cables category 7. Commonly called punchdown connections, these connections. Cable dielectric provides sufficient insulation to allow testing voltages to be applied to the cable sheath while workers are working on the isolated and earthed primary conductor. Heat shrink cable termination outdoor hv 11kv 33kv 3 core. Every cable, whether it is lowtension type or hightension type, needs proper termination so that a cable run can be connected to a piece of equipment, usually a circuit breaker, a transformer, a motor and so on. The products are designed to work together as a cable system. Cable terminations and jointing are designed to eliminate the stress concentrationat the screen termination to avoid the breakdown of the cable electrical field has to be controlled in a cable termination and jointing. If cables are terminated through windowtype current transformers, inspect to verify that.
It should be noted that terminations may need to be added to avoid flashover for installation tests on cables rated above 35 kv. Mv cable accessories installation best practice pdf ensto. Shall be hydraulic compression longbarrel type with application preformed insulated cover, heatshrinkable. The high voltage live work manual has been compiled as a standard work technique document and as reference resource, to assists work parties who are conducting high voltage hv live work techniques for all voltages up to and including 33kv. Woking unit 19, woking business park, albert drive, woking, gu21 5jy tel. These sealing ends are also called terminations or terminals. Pdf onsite condition assessment of hv cable terminations in. In this next video the procedure for installing heat shrink cable terminations is covered including key stages of the mv hv cable preparation process a 33kv single core cable termination with polymeric xlpe insulation is installed. Addon kits for dry plug inswitchgear and transformer terminations 42 iii. Finally punch the cable lugs on each core terminal with the help of hydraulic crimping tool and insulate the lugs with insulation tape, tie the cable with supporting clamp and gland the cable in the transformer cable termination box, connect the cable to the bushing and fix the bolt tightly. The cable laying shall be performed continuously at a speed not exceeding 600 to meters per hour.
For example, when removing cable insulation, the installer. High voltage connectors high voltage connectors for outdoor terminations 58 high voltage cable. A termination intended for use where it is not protected from direct exposure to either solar radiation or precipitation. 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. Practical hv cable jointing and terminations for engineers. Euromold is also the manufacturer of electrical components for the high voltage accessories of the nexans group. This type of cable is normally constructed with five parts. Design of cable termination for ac breakdown voltage tests mdpi. Insure that the input voltage to the test set is regulated.
How to make termination joint to the 11kv 3 core xlpe cable. How to make termination joint of 11kv 3 core xlpe cable this video is explains the complete procedure of cable termination joint. Pdf the ultrahigh frequency partial discharge detection method described in the paper is successfully applied online to assess the insulation. Terminations for such cables would not be required to provide electric stress. Terminations to connect the end of a cable to another element of the network. Test voltages shall not exceed 80 percent of cable manufacturers factory test value or the maximum test voltage in table 100. Inspect shield grounding, cablesupports, and terminations. High voltage xlpe cable systems techincal user guide brugg cables page 3 1.
The second type of high voltage underground cable is the solid dielectric insulated cable. Safe work practices on high voltage cables revision no. General information on high voltage cable systems 1. Some cables below 2 kv do not have an insulation shield. Terminations to indoor switchgears, electric motors, power transformers, instrument transformers and other electrical mv and hv mv.
1530 503 44 1026 1011 342 1630 477 229 871 277 1155 926 465 1509 1288 329 1025 11 1342 1121 239 1405 1444 370 1509 133 1071 251 1591 1022 1337 319 1357 1556 886 1431 65 745 442 766 148 1497 477 602 235 730 1163 350