:: DEFINE | Management Consultancy & Training Provider In UAE, Abu Dhabi,Dubai,Saudi Arabia ::

LV/MV/HV CIRCUIT BREAKERS (SWITCHGEAR): INSPECTION, MAINTENANCE, DESIGN, REPAIR & TROUBLESHOOTING

Location

Dubai, UAE

Date

From Date: 01-Sep-2025
To Date: 05-Sep-2025

Duration

5 days

Language

ENGLISH

Discipline

ELECTRICAL & POWER ENGINEERING

Introduction

Circuit breakers (switchgear) are vital components in electrical systems, designed to protect circuits from overcurrents and faults. They are categorized by voltage levels:

Low Voltage (LV) Circuit Breakers: For residential and small commercial systems (up to 1,000 V).
Medium Voltage (MV) Circuit Breakers: For industrial plants and power distribution (1,000 V to 72 kV).
High Voltage (HV) Circuit Breakers: For power plants and transmission networks (above 72 kV).

Key aspects of circuit breaker management include inspection, maintenance, design, repair, and troubleshooting. Regular inspections ensure reliability, maintenance extends lifespan, and troubleshooting helps identify and fix issues. Proper functioning is crucial for electrical system safety, preventing damage, downtime, and hazards.

Objective

This course is designed to enable participants to:

Specifications & overviews of switchgear components, selections & ratings up to 33 kV.
Describe switchgear construction: metal-enclosed & Metal-clad
Describe the four basic types of low and medium voltage circuit breaker.
Switchgear rating (breaking & making capacities).
Testing and Maintenance policies of Switchgear testing & failure analysis.
Electrical Safety Practices.
Safety Aspects of some switchgear elements.
Importance of arc flashing and relay co-ordination studies from operation & safety point of view.
Evaluate the advantages of modern state-or-the-art switchgear protection for your applications, including preventative maintenance information

Audience

Managers, Engineers and Technicians, responsible for the design, installation, testing and operation of electrical substations and power stations, who require to refresh their knowledge and skills in working with circuit breakers at low and medium voltage level. Technicians and engineers who are responsible for maintaining, testing and troubleshooting of HV/MV/LV switchgear.

Content

Overview of HV switchgear

Related Standards
Switch board layout
Ratings
Switchgears types & function
Switchgear Components
Types of MV switchgear
Switch
Disconnector/Isolator
Circuit breaker
CB behavior under fault conditions
Contactors
Insulation methods
Oil circuit breakers
Air break switchgear
Sulphur-hexaflouride (SF6)
GIS switchgear
Vacuum breakers
Comparison of insulating methods for CBs
Types of closing mechanisms
Circuit?Breaker Control

Overview of Low Voltage Switchgear

Purpose of LV Switchgear.
Construction
Main Air Break Circuit-Breaker
Contactors
Moulded Case Circuit-Breaker
Miniature Circuit-Breaker
Earth Leakage Circuit-Breaker
Low Voltage Switchboards
Centre (Incomer) Section
MCC Section
Fuses
LV CB Nameplate

Hazards of Electricity

Electrical Safety Hazards.
Electric Shock.
Effects of current on human beings based on IEC 60479.
Shock Hazard Analysis.
Arc-Flash and Arc Blasts.
Electrical Arc Flash Characteristics
Arc-Flash Metrics.
Arc-Blast Effect.
Light and Sound Effects.
Elements and characteristics of an Arc Flash Event.
Arc Flash Hazard Analysis.

Different Tests

Insulation Testing
Insulation Resistance Testing
Components of DC Leakage Current
Polarization Index
DC Hi-Pot Test
Insulation Power Factor
On-Line Monitoring
Thermography
PDA - Partial Discharge Analysis
- What is a Partial Discharge
- Measuring Partial Discharge Activity
- PDA Curves
Contact Resistance Test.
Timing Test.
Motion Analyzer Test.
Turns Ratio Test.
Protective Relay System Tests.
Oil Analysis.

CT & VT and Relays maintenance & Tests

Introduction
Relay Maintenance Testing and Commissioning
Type tests
Routine factory production tests
commissioning tests
Periodic maintenance tests
Secondary Injection Testing
Frequency of Inspection and Testing
Relay Maintenance Tests
Protection Scheme Design for Maintenance
Primary Injection Tests
Current Transformer Tests
- CT Ratio Check
- CT Polarity Check
- CT Magnetization Curve
Voltage Transformer Tests
- Polarity check
- Ratio check
- Phasing check

CBs Failure investigation

Failure investigation
Procedure for the investigation of circuit breaker failures
- Immediate action
- Investigations
- Recommended plan of action
Failure analysis
- Operating mechanism failures
- Failures due to degradation of external solid insulation
- Failures due to voltage transients
- Failures due to misapplication
- Failures due to animals
- Other causes of failures
- Failures due to loss of SF₆
- Failures due to degradation of the SF₆
- Failures due to SF₆ gas liquefaction
- Failures due to degradation of Internal solid insulation
- Interrupter failures
Bulk & Minimum oil circuit breakers
Vacuum circuit breakers
Air magnetic circuit breakers
Air blast circuit breakers
circuit breakers
Failure modes and causes
Diagnostics & Diagnostic tests

NOTE:

Pre & Post Tests will be conducted

Case Studies, Group Exercises, Group Discussions, Last Day Review & Assessments will be carried out.

Certificate

Define Management Consultancy & Training Certificate of course completion will be issued to all attendees.

Methodology

A highly interactive combination of lectures and discussion sessions will be managed to maximize the amount and quality of information and knowledge transfer. The sessions will start by raising the most relevant questions and motivating everybody to find the right answers. You will also be encouraged to raise your questions and to share in the development of the right answers using your analysis and experiences. Tests of the multiple-choice type will be made available daily to examine the effectiveness of delivering the course.

Very useful Course Materials will be given.

30% Lectures
30% Workshops and work presentation
20% Group Work& Practical Exercises
20% Videos& General Discussions

Course Details