Design, Maintenance of High, Medium and Low Voltage Switchgears (HV, MV & LV)

INTRODUCTION
• Electrical engineering basic concepts
• Three-phase review and per unit
• Voltage levels
• One-line and three-line diagram
• Generation system layout
• Transmission system layout
• Substation system layout
• Distribution system layout

INDUSTRIAL SWITCHGEAR
• Fuses
• Auto-reclosers
• Automatic sectionalizing
• Circuit Breakers
• Isolator switches
• Load switches
• Relays
• Current transformers
• Voltage transformers

CB DESIGN SPECIFICATION BASED ON SHORT CIRCUIT CURRENT LEVEL
• Per unit system
• Faults on power systems
• Transient phenomena in power systems
• Symmetrical component analysis of three-phase network
• Network connection for various fault types
• Current and voltage distribution in systems due to a fault
• Effect of systems on zero sequence quantities
• Computer programs based short circuit calculation
CB DESIGN SPECIFICATION BASED ON ARC PHENOMENA AND CIRCUIT INTERRUPTION
• Arc phenomena
• Maintenance of the Arc
• Properties of Arc
• Arc Interruption theory
• Circuit Breaker Rating
• Circuit constants and circuit conditions
• Conditions of severity
• Class A ultra-fast transients
• Class B system transients
• Class C low transients
• Transmission line transient
• Switching transients
• Duties of Switchgear

LV CIRCUIT BREAKERS
• Low voltage current limiting circuit breakers
• Low voltage circuit breakers with high breaking capacity
• Insulated case circuit breakers
• Low voltage air circuit breakers
• Low voltage circuit breakers specification

MODERN MV AND HV VACUUM CB
• Introduction
• Advantages of vacuum interruption
• Vacuum contactors and interrupters
• Vacuum medium
• Vacuum arc
• Vacuum arc stability
• Vacuum break down
• Vacuum switch construction
• Applications of vacuum circuit breakers

MODERN MV AND HV SF6 CB INTRODUCTION
• Basic Features of SF6 Breakers
• Dielectric properties of SF6
• Quenching properties of SF6
• Construction of SF6 breaker
• SF6 CB types
• Puffer type SF6 breakers
• Double Pressure System
• Single Pressure Puffer-Piston System
• Single Pressure Self Blast System
• Improvement in SF6 Breakers for HV

AIR CIRCUIT BREAKERS
• Method of increasing arc resistance
• Plan break type
• Magnetic blow out type
• Arc splitter type
• Application
• Construction and operation
• Axial air CB
• Blast air CB

OIL CIRCUIT BREAKERS
• Arc rupture under oil
• Advantages of oil
• Disadvantages of oil
• Plan break oil circuit breakers
• Arc control circuit oil breakers
• Minimum oil circuit breakers
• Construction and operation

DC CIRCUIT BREAKERS
• Construction
• Methods of interruption
• Application

CIRCUIT BREAKER INSPECTION, MAINTENANCE AND SERVICES
• Inspection
• inspection technical procedure
• Daily inspection of circuit breakers
• Monthly inspection of circuit breakers
• Annual inspection of circuit breakers
• Disassembly
• Cleaning
• Tightening
• Lubrication
• Equipment used in testing
• Testing procedure
• Direct testing
• Contact resistance test.
• Insulation resistance test
• Test report
• Indirect testing
• One-hour Video, HV CB Maintenance and Repair

CIRCUIT BREAKERS CONTROL, PROTECTION AND TESTING
• Switchgear control devices and wiring
• Switchgear protection devices and wiring
• Testing classification
• Testing laboratories
• Description of a simple testing station

1ST BATCH: Tuesday, February 3, 2026 — Tuesday, February 3, 2026.

2ND BATCH: Tuesday, May 26, 2026 — Friday, May 29, 2026.

3RD BATCH: Tuesday, September 22, 2026 — Friday, September 25, 2026.

The training methodology integrates lectures, interactive discussions, collaborative group exercises, and
illustrative examples. Participants will acquire a blend of theoretical insights and hands-on practical
experience, emphasizing the application of learned techniques. This approach ensures that attendees return
to their professional environments equipped with both the competence and self-assurance to effectively
implement the acquired skills in their responsibilities.