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Practical HV cable jointing and termination 
www.idc-online.com/slideshare Technology Training that Works
Topics 
• Need for high voltage cables 
• Advantages of using cables over overhead 
transmission lines 
• Disadvantages of...
Function of electrical lines 
• Transmitting power from generating source to 
load centers 
• Distributing power from main...
Typical overhead line 
www.idc-online.com/slideshare Technology Training that Works
Section of typical HV cable 
www.idc-online.com/slideshare Technology Training that Works
Why high voltage? 
• The higher the voltage, the lower the current 
for a given value of power 
• More energy transmitted ...
Relation between voltage and load rating 
Motor rating in kw Operating voltages in Volts 
Up to 200kw 415V 
Between 200 to...
Cables: Advantages 
• Less space compared to overhead lines 
• No visual intrusion (also called visual 
pollution) 
• Not ...
Cable-drawbacks 
• Fault location is difficult and time consuming 
• Expensive 
• More monitoring (for certain types of ca...
Common types of HV cables 
• Low pressure oil filled cables 
• High pressure oil filled cables (Common for 
EHV) 
• Paper ...
Need for jointing (Splicing) 
• Cables are heavy and difficult to transport 
• Fixed drum lengths (e.g.,500m) are typical ...
Types of joints 
• Straight through 
– Long routes and repaired sections 
• Branch Y joints 
– For branching of a feeder 
...
Straight-through joint 
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Making of a T-Joint 
www.idc-online.com/slideshare Technology Training that Works
A typical Y-branch joint 
www.idc-online.com/slideshare Technology Training that Works
Need for termination 
• A cable needs to be connected to an equipment or 
another cable 
• A connection between two cables...
Typical outdoor termination 
www.idc-online.com/slideshare Technology Training that Works
DO YOU WANT TO KNOW MORE? 
If you are interested in further training or information, 
please visit: 
http://idc-online.com...
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Practical HV Cable Jointing and Terminations for Engineers and Technicians

The range of voltage and capacity of power transmitted through cables is showing a steady increase over the years. Environmental concerns, aesthetic issues, lack of transmission corridors and difficulty in routing overhead lines in crowded human habitats are some of the reasons for the explosive growth of cable technology well into the extra high voltage range. Due to physical limits on cable lengths for manufacturing and packaging, joints in cable become inevitable, particularly in the context of the utility sector. 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.

Cable terminations and joints form the weakest link in any distribution system. Also, a failed joint in an underground distribution system is much more difficult to locate and repair compared to any similar problem in overhead distribution systems. This means that we should do our upmost to achieve a good joint or termination, which can give years of trouble-free service. The quality of a joint or termination depends to a large extent on the skill of cable jointer. The aim of a cable jointer must therefore be to obtain a joint whose electrical properties are as good as the original cable both in electrical and mechanical terms. The design of cable jointing and termination accessories is based on this perception. Dependence on operator-skill is sought to be reduced to the extent possible by good choice and quality of jointing materials, though such dependence cannot be totally eliminated.

We will discuss these issues in this course by looking at the fundamental theoretical aspects involved so that the importance of the correct execution of a termination or joint will be brought home to those who attend the workshop.

MORE INFORMATION: http://www.idc-online.com/content/practical-hv-cable-jointing-terminations-engineers-and-technicians-3

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Practical HV Cable Jointing and Terminations for Engineers and Technicians

  1. 1. Practical HV cable jointing and termination www.idc-online.com/slideshare Technology Training that Works
  2. 2. Topics • Need for high voltage cables • Advantages of using cables over overhead transmission lines • Disadvantages of cables • Various types of high voltage cables • Need for cable jointing • Need for termination • Various types of jointing kits and termination kits www.idc-online.com/slideshare Technology Training that Works
  3. 3. Function of electrical lines • Transmitting power from generating source to load centers • Distributing power from main substations to individual consumers • Lines can be overhead conductors or underground cables • Long transmission lines and rural distribution by overhead lines • Shorter/urban feeders by cables www.idc-online.com/slideshare Technology Training that Works
  4. 4. Typical overhead line www.idc-online.com/slideshare Technology Training that Works
  5. 5. Section of typical HV cable www.idc-online.com/slideshare Technology Training that Works
  6. 6. Why high voltage? • The higher the voltage, the lower the current for a given value of power • More energy transmitted for a given conductor section • Lower conductor losses www.idc-online.com/slideshare Technology Training that Works
  7. 7. Relation between voltage and load rating Motor rating in kw Operating voltages in Volts Up to 200kw 415V Between 200 to 500kw 3300V Between 500kw to 2500kw 6600V Above 2500kw 11000V www.idc-online.com/slideshare Technology Training that Works
  8. 8. Cables: Advantages • Less space compared to overhead lines • No visual intrusion (also called visual pollution) • Not susceptible to atmospheric activity (wind/lightning) • Higher surge impedance reduces severity of switching over voltages • Ideal way to transmit power across a water body (e.g., supply to an island) www.idc-online.com/slideshare Technology Training that Works
  9. 9. Cable-drawbacks • Fault location is difficult and time consuming • Expensive • More monitoring (for certain types of cables) • Jointing/termination require persons with high skill levels • Joints/terminations become weak points • Testing is difficult and time consuming www.idc-online.com/slideshare Technology Training that Works
  10. 10. Common types of HV cables • Low pressure oil filled cables • High pressure oil filled cables (Common for EHV) • Paper insulated cables • Cross linked polyethylene (XLPE) cables www.idc-online.com/slideshare Technology Training that Works
  11. 11. Need for jointing (Splicing) • Cables are heavy and difficult to transport • Fixed drum lengths (e.g.,500m) are typical packaging norm • Longer feeder lengths need joints • Joints are needed for partial replacement (in case of a cable fault) • Joints are also needed for specific purposes (next slide) www.idc-online.com/slideshare Technology Training that Works
  12. 12. Types of joints • Straight through – Long routes and repaired sections • Branch Y joints – For branching of a feeder • T joints – For branching of a feeder • Transition joints – Special joints between two different types of cables (Oil filled/XLPE) www.idc-online.com/slideshare Technology Training that Works
  13. 13. Straight-through joint www.idc-online.com/slideshare Technology Training that Works
  14. 14. Making of a T-Joint www.idc-online.com/slideshare Technology Training that Works
  15. 15. A typical Y-branch joint www.idc-online.com/slideshare Technology Training that Works
  16. 16. Need for termination • A cable needs to be connected to an equipment or another cable • A connection between two cables is called a joint • A connection to an equipment is called a termination • Termination can be indoor type or outdoor type • End sealing kits are used to cover the cut end of a cable against moisture entry www.idc-online.com/slideshare Technology Training that Works
  17. 17. Typical outdoor termination www.idc-online.com/slideshare Technology Training that Works
  18. 18. DO YOU WANT TO KNOW MORE? If you are interested in further training or information, please visit: http://idc-online.com/slideshare www.idc-online.com/slideshare Technology Training that Works

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