EE028: Practical High Voltage Cable Jointing and Termination

Transcription

1 EE028: Practical High Voltage Cable Jointing and Termination EE028 Rev.001 CMCT COURSE OUTLINE Page 1 of 5

2 Training Description: 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. Training Objective: By the end of the training, participants will be able to gain understanding on: 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 of cable termination and jointing and choosing an appropriate type for every application Importance of stress control and methods of stress redistribution in joints and terminations Importance installation aspects in cable joints and terminations International and national standards applicable Type testing and routine testing Failures, failure analysis and failure prediction Future trends in cable technology and cable accessories EE028 Rev.001 CMCT COURSE OUTLINE Page 2 of 5

3 Training Designed for: The course is intended for Instrumentation and Control Engineers, Consulting Engineers, Electrical Engineers, Project Engineers, Maintenance Engineers, Power System Protection and Control Engineers, Building Service Designers, Data Systems Planners and Managers and Electrical and Instrumentation Technicians. Training Program: DAY ONE: PRE-TEST 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 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 DAY TWO: Typical Overhead Line Section of Typical HV Cable 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 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 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 Cable-Drawbacks Fault location is difficult and time consuming Expensive EE028 Rev.001 CMCT COURSE OUTLINE Page 3 of 5

4 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 DAY THREE: 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 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 DAY FOUR: 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) Straight-through Joint Making of a T-Joint A typical Y-branch Joint DAY FIVE: 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 Typical outdoor termination Course Conclusion POST-TEST and EVALUATION Training Requirement: Hand s on practical sessions, equipment and software will be applied during the course if required and as per the client s request. EE028 Rev.001 CMCT COURSE OUTLINE Page 4 of 5

5 Training Methodology: This interactive training course includes the following training methodologies as a percentage of the total tuition hours:- 30% Lectures, Concepts, Role Play 30% Workshops & Work Presentations, Techniques 20% Based on Case Studies & Practical Exercises 20% Videos, Software & General Discussions Pre and Post Test Training Certificate(s): Internationally recognized certificate(s) will be issued to each participant who completed the course. Training Fees: As per the course location - This rate includes participant s manual, hand-outs, buffet lunch, coffee/tea on arrival, morning & afternoon of each day. Training Timings: Daily Timings: 07:45-08:00 Morning Coffee / Tea 08:00-10:00 First Session 10:00-10:20 Recess (Coffee/Tea/Snacks) 10:20-12:20 Second Session 12:20-13:30 Recess (Prayer Break & Lunch) 13:30-15:00 Last Session For training registrations or in-house enquiries, please contact: Aisha Relativo: aisha@cmc-me.com Tel.: or Mob.: Training & Career Development Department EE028 Rev.001 CMCT COURSE OUTLINE Page 5 of 5