Course at a Glance
Code: CCB
Course Length: 3 Months

In this interactive 3 month LIVE ONLINE course, you will learn how to:

  • Describe the fundamentals of operating switchgear and circuit breakers
  • Select appropriate type and rating of circuit breakers and switchgear
  • Understand the operation of switchgear components (CTs, VTs, relays and cable terminations)
  • Describe the principles of operation of power transformers
  • Identify and apply the different transformer types
  • Set up simple transformer protection schemes
  • Detail power transformer testing procedures
  • Manage power transformer breakdowns to minimise disruption
  • Detail safe working procedures in switch rooms, indoor and outdoor substations
  • Draw up simple operational policies for safety rules
  • Detail practical maintenance strategies for switchgear and transformers 


 

Course Details

Overview

Switchgear (and circuit breakers) and transformers are critical components in electrical distribution systems and their operation significantly affects the overall performance of the system. This course will discuss the application, installation, maintenance and testing issues relating to medium and high voltage switchgear, circuit breakers and transformers. Low voltage switchgear will also be covered and you will receive a thorough grounding in switchgear theory and standards. You will gain a solid understanding of the issues associated with the proper application, installation and maintenance of these critical items of equipment with an overriding emphasis on safety. The emphasis is on medium voltage (referred today as high voltage) switchgear which represents most of the switchgear installed on electrical distribution systems. The focus is on air blast, oil, SF6 and vacuum circuit breakers.

Case studies covering the main manufacturers' equipment will illustrate the important practical principles. Other power system protection components will be discussed as well to ensure that switchgear is understood in the correct context. Installation of high voltage distribution and transmission equipment has increased significantly over the years due to ongoing global demand for power. As a result, the need to ensure reliability of operation of power systems is paramount. Power transformers are among the most important and most expensive components of power systems. Their failure can impose extraordinarily high costs on plants, factories and utilities of all descriptions. It is critical that all personnel operating and working with such equipment have a sound knowledge of their operational requirements and maintenance.

This practical course provides knowledge on both the theory and operation of power transformers. The course will develop and enhance an understanding of what is involved in the maintenance of these essential components of the power systems, through the tips and tricks learnt and developed by some of the world's pre-eminent electrical engineers.

 

Course Outline

MODULE 1: INTRODUCTION TO SWITCHGEAR AND TRANSFORMERS

Single line diagrams
Active and passive network components
Circuit breaker utilisation
Alternative forms of MV switchgear – ring main units and load breaking/fault making switches
Fuse switches
HV fuses in combination with and as alternatives to circuit breakers
Auto-reclosers and auto-reclose operation


MODULE 2: APPLICATION OF SWITCHGEAR

Principles of current interruption
Plain break circuit breakers
Bulk and small oil volume circuit breakers
Turbulator (explosion pot)
Operating mechanisms
Transfer earth circuit breakers
Air break and air blast switchgear
SF6 and vacuum
Switchgear in association with isconnectors
Fixed and withdraw-able designs
Switchgear standards
Factors affecting switchgear selection


MODULE 3: SPECIFICATION OF SWITCHGEAR

Switchgear ratings - highest system and impulse withstand voltages, load and short circuit currents
Simple and complex protection systems
Switchgear ancillaries, measurement CTs, VTs and relays
Cable terminations
Indoor and outdoor operation
Substation and switch room layouts and design

SHORT CIRCUIT TESTING

Symmetrical and asymmetrical breaking
Make and break operations
Understanding test oscillograms
Case study - Specification for a 132 KV Switchboard


MODULE 4: SAFETY POLICIES

General safety precautions and the use of personal protective equipment
Principles of safety rules
Principles of personal authorization
Operative training for safe operation of switchgear
Isolation in a circuit breaker context
Safety documentation
Operational and safety locking, caution and danger notices
Work safety in a substation environment
Safety interlocks
Substation alarms
Individual study tasks and presentation - safety policies in my company and how they might be  improved


MODULE 5: OPERATION OF MODERN SWITCHGEAR

Case Studies
- Sprecher and Schuh
- Schneider
- ABB
- Siemens

ASSETS MANAGEMENT IN A SWITCHGEAR CONTEXT

Principles of time and condition based asset management
Asset registers
Asset management systems


MODULE 6: DIAGNOSTICS, TESTING AND MAINTENANCE

Switchgear inspection methodologies
Partial discharge measurement and survey
Timing tests
Thermovision
Mechanisms of deterioration
Principles of circuit breaker maintenance
Maintaining oil circuit breakers
Contact maintenance and contact wipe
Oil testing
Maintaining vacuum circuit breakers
Maintaining SF6 circuit breakers
SOPs and DINs
Switchgear defects and defect control Systems


MODULE 7: TRANSFORMERS' MAIN FUNCTIONS AND CLASSIFICATION

Construction (shell type and core type)
Classification and type in relation to insulation, windings, core, cooling systems, voltage level, sizing, tank and breathing action
Transformer parts

POWER TRANSFORMERS AND SAFETY

How to install, operate and work with high voltage power transformers safely
Earthing of HV transformers


MODULE 8: TRANSFORMER THEORY

Electrical values and their definition in a power transformer - voltage, current, number of turns,  impedance and their interrelation

OPERATION OF POWER TRANSFORMERS IN A POWER SYSTEM

Thermal performance, loading, paralleling, tap-changing, connections and vector groups


MODULE 9: POWER TRANSFORMER PROTECTION

Surge protection
Protective relaying (differential, over-current and earth fault)
Buchholz relay and pressure relief relay
Thermal devices and instruments (oil temperature alarm and trip, winding temperature alarm and trip)


MODULE 10: AUTO-TRANSFORMERS, GENERATOR TRANSFORMERS, UNIT TRANSFORMERS AND STATION TRANSFORMERS

Design criteria
Specifications


MODULE 11: OIL QUALITY

Oil contents: water, acidity and dissolved gas
Oil tests: dielectric breakdown, moisture, resistivity, interfacial tension, specific gravity, power factor and furan analysis
Recovery voltage measurement test


MODULE 12: POWER TRANSFORMER ELECTRICAL TESTS

AC Tests:

- Power factor tests (insulation, oil, and bushings)
- Single phase excitation current test
- Transformer turns ratio test

DC Tests:

- Insulation resistance test
- Dielectric absorption test
- Polarization index test
- Step voltage test
- Hi-pot test

PREVENTATIVE MAINTENANCE ON POWER TRANSFORMERS

Techniques to improve life expectancy

 

Learning and Teaching

Benefits of eLearning to Students

  • Cost effective: no travel or accommodation necessary
  • Interactive: live, interactive sessions let you communicate with your instructor and fellow students
  • Flexible: short interactive sessions over the Internet which you can attend from your home or office. Learn while you earn!
  • Practical: perform exercises by remotely accessing our labs and simulation software
  • Expert instructors: instructors have extensive industry experience; they are not just 'academics'
  • No geographical limits: learn from any location, all you need is an Internet connection
  • Constant support: from your instructor(s) and a dedicated Learning Support Officer for the complete duration of the course
  • International insight: interact and network with participants from around the globe and gain valuable insight into international practice 


Benefits of eLearning to Employers

  • Lower training costs: no travel or accommodation necessary
  • Less downtime: short webinars (60-90 minutes) and flexible training methods means less time away from work
  • Retain employees: keep staff who may be considering a qualification as full time study
  • Increase efficiency: improve your engineering or technical employees’ skills and knowledge
  • International insight: students will have access to internationally based professional instructors and students

 

How Does it Work?

EIT eLearning courses involve a combination of live, interactive sessions over the Internet with a professional instructor, set readings, and assignments. The courses include simulation software and remote laboratory applications to let you put theory to practice, and provide you with constant support from a dedicated Learning Support Officer.


Practical Exercises and Remote Laboratories

As part of the groundbreaking new way of teaching, our online engineering courses use a series of remote laboratories (labs) and simulation software, to facilitate your learning and to test the knowledge you gain during your course. These involve complete working labs set up at various locations of the world into which you will be able to log to and proceed through the various practical sessions.

These will be supplemented by simulation software, running either remotely or on your computer, to ensure you gain the requisite hands-on experience. No one can learn much solely from lectures, the labs and simulation software are designed to increase the absorption of the materials and to give you a practical orientation of the learning experience. All this will give you a solid, practical exposure to the key principles covered and will ensure that you obtain maximum benefit from your course.

 

Brochure

Brochure

To access the detailed program brochure, please complete this form.

 

Endorsed by ISA

School of Electrical Engineering