HV Cable Joining & Termination for Engineers & Technicians

Course Overview

Power cables are essential components in the power system that ensure the safe and efficient transmission of electricity from one point to another. One of the key importance of cables is safety. These Cables are designed to handle high levels of current without overheating or causing electrical hazards. 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 This means that we should do our utmost 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/splicer.

Course Objectives

Upon completion of the course. Participates will be aware with:-

• Electrical cable importance ,types ,construction and application
• Cables system Laying
• Cable system design
• Termination of the power and control cables
• Cable splicing ( Jointing ) different techniques

And Participates will be able to:-

• Identify the components layers of cables
• Sizes cables according to load and voltages rating
• Perform the jointing procedures for different cable types, size
• Safely carry out the necessary jointing for power cables
• Identify Cables faults and faults locators

Course Contents

Day.1

Construction of Electrical Power Cables

• Cables functions
• Cables types for different application and construction introduction
• Cables Conductor
• Electrically Non-Conducting Materials In the Cables
• Compositions of power and control cables
• Semi conducting Screen
• Insulation
• Armoring
• Outer cover
• Typical examples

 

Day.2

Cables Voltage Ratings and Manufacturing Aspects

• Current Ratings of Power Cables
• Volt-drop within a Cable
• Heat dissipation during short circuits
• Earth fault loop impedance
• Protection against Overloading Current
• Cables with Special Performance
• Comparison between Overhead &underground cables
• Selection tables

Day.3

Engineering cable tables, and selection criteria’s

• Cable sizing techniques
• De-rating factors for various temperatures
• Underground installations for industrial, commercial, and mining applications
• Typical example from DUCAB company
• Cable Termination Theory and Practice introduction
• Cable Failure Modes and causes
• Cable splicing and jointing components and specifications introduction

 

Day.4

Cable  Jointing and Terminations Theory and Practice

• Cable Termination Theory and Practice details
• Preparation the location of the fault cable to repair
• Preparation the cable to make splice
• Heat-shrinkable joints (video)
• Cold shrinkable joints
• Cable Stripping Tool
• Crimping Tool
• Heat shrinkable Termination (video)
• Cold shrinkable Termination.
• Importance Installation Aspects in Cable Joints and Terminations
• Measurement and Testing Cables
• Life test and loading the cables
• Cables Joints test
• DC Hi-Pot Testing
• AC Hi-Pot Testing
• Very Low Frequency (VLF) Testing

 

Day.5

Techniques for Cable Fault Locating

• Frame / Earth Fault Detection
• Wheatstone Bridge
• Time Domain Reflect meters (TDR)
• High-voltage surge generators / thumpers
• Defined the fault location of the cable
• Understanding Cable Deterioration
• Electrical Treeing (pre-breakdown)
• Thermal Problems