Medium Voltage & High Voltage Switch-gear Operations & Maintenance
Who should attend?

This training course will benefit all levels of professionals in an electrical installation. It will enable them to understand the operations and maintenance of medium and high voltage circuit breakers and switchgear. This training course is suitable for a wide range of technical professionals but will greatly benefit:

  • Electricians
  • Electrical supervisors
  • Plant electricians
  • Operations & maintenance engineers, supervisors & technicians
  • Maintenance technicians
5 Days
Programme Overview

This training course will present a comprehensive capsule of all the knowledge essential for the medium voltage and high voltage switchgear operations and walk the participants through the switchgear design process using a set of interlinked case studies. The training course focuses mainly on the operation and maintenance of distribution equipment namely transformers, circuit breakers, contactors, isolators, and disconnectors (this will also include the auxiliary peripherals and control circuits). Medium and high voltages switchgear are the integral component of any electrical distribution system; hence, the selection and installation of this switchgear are vital so as to provide protection and safe distribution of electrical power. The equipment needs to be operated in a safe manner securing continuity of supply to consumers. This training course will feature:

  • Understanding the types of medium voltage and high voltage switchgear
  • Operation principle of medium voltage circuit breakers
  • Identification of the various types of high voltage switchgear
  • Maintenance of testing of switchgear
  • Construction and operations of high voltage transformers

By the end of this training course, participants will be able to:

  • Understand the role and importance of switchgear
  • Determine the components and operations of medium voltage circuit breakers
  • Explain the different types of maintenance and testing for switchgear
  • Analyze the common faults and short circuit current
  • Design and components of high voltage transformers
This training course will utilize a variety of proven adult training techniques to ensure maximum understanding, comprehension, and retention of the information presented. This includes presentation and discussion of the latest videos and technologies on medium and high voltage switchgear. Questions are encouraged throughout, particularly at the daily wrap up sessions. This provides opportunities for participants to discuss with the Presenter specific issues and, if possible, find appropriate solutions. Specific goals of each participant will be discussed to ensure that their needs are fulfilled whenever practicable.
Course Outline

Day One: The Role and Importance of the Switchgear in Power Systems

  • Circuit breakers, auto reclosers, disconnectors, and sectionalizers operations
  • Earth switches construction and applications
  • Switchgear symbols on single-line diagrams
  • Substation switchgear layouts
  • Types of the current situation
  • Fault clearing process

Day Two: Sulphur HexaFlouride (SF6) and Vacuum Circuit Breakers

  • Compression principles
  • SF6 hazards and test equipment
  • Dead and Live tank HV circuit breakers
  • Operation mechanisms of HV circuit breakers
  • Vacuum interrupters operation and maintenance
  • Automated circuit breaker monitoring

Day Three: Maintenance and Testing of Switchgears

  • Manufacturer testing
  • Installation and commissioning
  • Documentation requirements
  • Importance of maintenance & testing
  • Maintenance strategies
  • Infrared testing

Day Four: Short Circuit Currents and Calculations and Working Safely

  • Introduction to types of relay
  • Relay selection, basic concepts, and characteristics
  • Types of distress and protection modes
  • Introduction to safety in HV Substations
  • Switchgear numbering and nomenclature
  • Switchgear mechanical and electrical interlocking

Day Five: HV Transformer

  • HV current transformers construction, operation and maintenance
  • HV potential transformers features and operation
  • Power transformer construction and operation
  • Buchholz relay, pressure relief device
  • Protective relay, conservator and breather operating principles
  • Maintenance of power transformers

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