Engineering and Maintenance
Design, Inspection, Maintenance, Repair and Troubleshooting of LV/MV/HV Circuit Breakers and Switchgears
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Design, Inspection, Maintenance, Repair and Troubleshooting of LV/MV/HV Circuit Breakers and Switchgears Course
Introduction:
Course Objectives:
- This course is designed to enable participants to:
- List the voltage convention classifications used in this course.
- Describe switchgear construction.
- Describe a ground fault relay system.
- Describe the three basic types of low and medium voltage circuit breaker contacts.
- Describe the molded case circuit breaker.
Who Should Attend?
This course is recommended for skilled trades, supervisors, and anyone involved in the maintenance of industrial power circuit breakers.
Course Outlines:
General 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 Switchgears
- Fuses
- Auto-reclosers
- Automatic sectionalized
- 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 the power system.
- Symmetrical component analysis of three-phase network
- Network connection for various fault types
- Current and voltage distribution in the system due to a fault
- Effect of the system on zero sequence quantities
- Computer programs based on 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
- Restriking voltage transient
- 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 molded case current limiting circuit breakers
- Low voltage molded case 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
- The vacuum medium
- The 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
Other Type of Circuit Breakers
- Air Circuit Breakers
- Method of increasing arc resistance