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Safe Operation & Maintenance of Circuit Breakers and Switchgears

Why Attend

Circuit breakers, fused switches, and switchgear in the form of motor Control Centres (MCC) are necessary system items for the electrical control of the electrical plant. The safe use of these devices and associated equipment require correct initial selection, operation, and maintenance. It is also necessary to have a detailed understanding of how these devices should be installed, the local substation and system ratings, and how the various breakers operate, in order to enable accurate troubleshooting and subsequent repair.

Overview

Course Outline

Schedule & Fees

Course Methodology

Instructor-led training that uses interactive learning methods, including class discussion, small group activities, and role-playing

Course Objectives

Understanding of the operational characteristics of circuit breakers and switchgear.; Understanding of troubleshooting procedures, as applied to circuit breakers and associated switchgear.; Improved capability in the use of test equipment.; A better understanding of failure modes and failure analysis as applied to fuses, circuit breakers, and switchgear. In relation to air brake, vacuum, and SF6 devices.; Refreshed awareness of electrical safety concerns within substations and control centres; Ability to determine fault levels in substations

Target Audience

Target Competencies

n/a

Day One

The Technology of Circuit Breakers and Switchgear

  • Typical substation arrangements and MCC's

  • Definitions and terminology

  • Fault level calculations

  • Motor and generator fault contributions

  • Low voltage equipment

  • Medium voltage equipment

  • High voltage equipment

  • Nameplate ratings - interpretation

  • CT's and VT's

  • Basic protection requirements

  • Case studies

Day Two

Operation of various types of interrupting equipment

  • Fuses - motor starting types

  • Fused switches

  • Molded case type breakers

  • Air break switches

  • Vacuum contactors - fused

  • Vacuum circuit breakers

  • SF6 puffer, rotating arc devices

  • Special insulating requirements for 36kV

  • Solid and gaseous insulation - problems!

Day Three

The Operation and Maintenance of Circuit Breakers and Switchgear

The Use of Test Equipment

  • Digital voltmeter (DVM)

  • Oscilloscopes

  • Megger

  • Frequency meter

  • Temperature probes/ IR pyrometers

  • Ammeters

  • Power meters

  • Load banks

  • Cable fault locators

Special Techniques

  • NEC checklists to ensure the correct installation

  • Troubleshooting of Electrical Equipment

  • Methods

  • Terminology

  • Principles

  • Special techniques

  • Case studies/ examples

  • Single line drawings

  • Group exercises and case studies

Day Four

The Interpretation and Use of Drawings

  • Single-line electrical drawings

  • Control schematics

  • Basic generic wiring lists

  • Nameplate information

  • Logic and standard symbols

  • Step and touch potential?

The Development of a Job Plan

  • Identification of the troubleshooting step-by-step sequence

  • Procedure preparation

  • Documentation

  • Follow-up

  • Safety considerations and training

  • Case studies

Day Five

The Identification and Repair of Problems/ Failures

  • Common mode failures

  • Phase imbalance - lost phase

  • Phase sequence checkout

  • Contact pitting/arcing - why?

  • Load and fault rating

  • Electronic component failure

  • Fusing

  • Switches

  • Control circuits

  • Ground faults - cable and busbar faults

  • Case studies

  • A review of Safety Requirements

  • Area classifications

  • NEC electrical codes

  • Safety information

$2875

Maputo

Country: Mozambique

Duration: One week

Date: 20–24 Oct 2025

Register

$4475

Stockholm

Country: Sweden

Duration: One week

Date: 06–10 Apr 2026

Register