Power Cables: Operation, Maintenance, Location and Fault Detection

THE WORKSHOP

Faults in underground cable may cause loss of supply to customers and loss of revenue for suppliers so it is imperative that the fault location process is efficient and accurate to minimise excavation time, which results in reducing inconvenience to all concerned. For fault locating to be efficient and accurate technical staff need to have expert knowledge accompanied with experience in order to attain service reliability.

This workshop is designed to ensure that those responsible for the selection, laying, operation, maintenance and monitoring of power cables understands the technical issues involved and comply with relevant specifications and requirements.

WHAT IS INCLUDED?

  • Receive a certificate of attendance in support of your continuing professional commitment
  • All workshops include the associated hardcopy technical manual
  • Printed workshop handouts
  • Lunch and refreshments
  • Interact and network with workshop attendees and experienced instructors
  • Practical, industry driven content to assist you in your continuing professional development (CPD)
  • Attendees automatically become IDC subscribers and receive exclusive deals and technical content every month

WHO SHOULD ATTEND?

Anyone associated with power cable operation, maintenance, location and fault detection techniques. The workshop will also benefit those working in system design as well as site commissioning, maintenance and troubleshooting. Typical personnel who would benefit are:

  • Electrical maintenance technicians and supervisors
  • Maintenance personnel
  • Operations personnel
  • Process control engineers
  • Service technicians

CONTENT SUMMARY

CABLES AND ACCESSORIES - AN INTRODUCTION

  • Low and high voltage cables
  • Advantages over overhead transmission lines
  • Disadvantages of cables in power transmission
  • Various types of cables
  • Cable jointing (splicing) accessories
  • Need for termination kits
  • Installation of cables

CONSTRUCTION OF CABLES

  • Basic constructional aspects
  • Insulation
  • Application areas
  • Cable standards

SELECTION AND INSTALLATION OF CABLES

  • Selection criteria
  • Sizing
  • Installation
  • Special locations
  • Fire prevention and fire protection for cable installations

JOINTS AND TERMINATIONS – THEORY

  • Importance of joints and terminations in a power cable installation                                                                                                     
  • Basic approach
  • Classification of joints and terminations
  • Pre-moulded (slip on) joints
  • Slip on termination
  • Cold shrink terminations
  • Insulating tape joint
  • Heat shrinkable joints
  • Extrusion moulded jointed for EHV cables
  • Additional requirement for outdoor terminations
  • Reconstitution of cable properties
  • Connectivity for cable screen and armour
  • Mechanical protection of joint and terminations
  • Special joints
  • Stress gradients in cable joints and terminations
  • Areas requiring stress control
  • Basics of stress control approach

PRACTICAL ASPECTS OF CABLE JOINTING AND TERMINATION

  • Kits for joints and terminations
  • Shelf life
  • Issues with prefabricated kits
  • Preparation of cable for termination and jointing
  • Connection and reconstitution of cable properties
  • Continuity and grounding aspects
  • Sealing, healthiness of joint/termination and repairs
  • Installation aspects for cables and joints
  • Safety issues and access for repairs
  • Termination to electrical machines
  • Termination of outdoor HV installation
  • Terminations to GIS installation
  • Importance of correct orientation of terminations
  • Installation aspects for cable joints and terminations
  • Safety issues and access for repairs

CABLE STANDARDS AND TESTING

  • Review of codes for testing requirements
  • Drum length checks   
  • Post installation checking
  • Pre commissioning and periodic tests
  • Test as tools for condition monitoring and early failure alarm
  • DC high potential test
  • Very low frequency AC HV tests
  • Partial discharge tests and mapping of results
  • Dielectric dissipation factor measurements   
  • Micro destructive and non-destructive tests for life assessment
  • Tips on operation and maintenance of cables for longer life

CABLE TERMINATION TO EQUIPMENT

  • Types of failures
  • Reasons for failures
  • Fault location
  • Electrical tests for detection of cable faults  
  • Safety issues in fault location
  • Analysis of failures
  • Documentation of work
  • Documentation of failures

NEW TRENDS

  • Increasing use of underground cables
  • New technologies for very high capacities and voltages
  • EHV XLPE cable systems
  • High temperature superconductivity in cables

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