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:
The purpose of this workshop is to provide participants with up-to-date information on Circuit Breakers and to cover the essential aspects of maintenance for low, medium, and high voltage switchgear. It is crucial to acknowledge the wide range of equipment utilized in modern low, medium, and high voltage switchgear.
Switchgears play a vital role in distributing and controlling electrical power in manufacturing facilities, power plants, and utility distribution systems. Neglecting proper maintenance practices can result in power system inefficiencies and a decrease in system reliability.
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