Switchgears help in protecting our modern power system network, from generation to distribution end. For proper control, protection and maintenance of a transformer, a well-bred switchgear system is required. As there are various voltage levels from generating to the distribution centers, various types of switchgears are required depending upon the requirements. Electrical switchgear also includes circuit breakers which help in protecting the circuit from over load or from short circuit.
This course gives a clear layout about switchgears and circuit breakers for high and medium voltage levels.
After completion of this course, students will have a clear idea about the urge and purpose of using a switch gear and circuit breakers. They will also know about the various types of circuit breakers being used presently.
WHO SHOULD COMPLETE THIS COURSE?
- Electrical engineers
- Electronics engineers
- Power system analysts
- Instrumentation engineers
- Process Engineers/Operators
- University Power System educators
- Electricians
- Machine Operators
COURSE OUTLINE
SWITCHGEAR
- Definition of switchgear
- Outdoor open type
- Outdoor metal enclosed type
- Indoor metal enclosed type
- Metal enclosed & metal clad
- Switch gear configuration
- Panel – single and double bus
- 2 bus and double bus switchgear
- Ring main unit
- Insulation & gas insulated switchgear
MV & LV SWITCHGEAR
- MV switchgear components
- Auxiliary devices & power
- Control, Measuring & protection element
- Earthing arrangement
- Safety interlocks & features
- Switchgear functions
- Standards
- LV switch gear – Major types
- LV switchboard
- Safety features
- IEC 62272-200 arc containment criteria
MAINTENANCE, MONITORING AND THERMAL IMAGING
- Instrument transformers
- Current transformer types
- Protection Vs. metering CTs
- Voltage transformers
- Maintenance and asset management
- Important asset classes
- Types of maintenance in use
- Condition based maintenance
- Condition determination for CBM
- Reliability – Centered Maintenance(RCM)
- Risk matrix
- Preventative task categories
- Insulation deterioration & causes
- Major diagnostic techniques
- Simple Insulation Resistance test & results
- Switchgear panel PD sites
- Transient Earth Voltage(TEV) monitoring
- PD monitoring
- DDF testing
- Thermal imaging
- Problems in switchgear
- Defect management
CIRCUIT BREAKERS – OIL VOLUME & AIR BLAST
- Circuit breakers – Need & Utilization
- CB fault clearing time
- Arc behavior during breaker operation
- Oil CB 'explosion pot' Arc control device
- Side vent arc control device
- Oil volume circuit breaker
- Basic air blast circuit breaker
- Axial air blast circuit breaker
- Performance of oil and air blast circuit
SF6 & VACUUM CIRCUIT BREAKERS
- SF6 circuit breakers
- Puffer type SF6 circuit breaker
- Rotating arc type SF6 circuit breaker
- Application & benefits of SF6
- Vacuum CB interrupter
- Current chopping in a vacuum CB
- Advantages & disadvantages of vacuum switchgear
- Comparison of breaker types
- Comparison of circuit breakers & their installation medium
- CB failure to trip
OPERATION MECHANISMS & SERVICE CONDITIONS
- Operation mechanisms used in breakers
- CB/Switchgear Ratings
- Indoor equipment
- Special service conditions
- Effect of altitude
- Voltage ratings
- Rated insulation level
- Rated short time & peak withstand current
- Symmetrical and Asymmetrical rating
- DC offset
LV CIRCUIT BREAKERS
- LV Circuit Breakers
- Air Circuit Breakers (ACB)
- Molded Case Circuit Breakers
- Type of releases for ACB/MCCB
- LV air CB adjustable characteristics
- MCCB current and current-time co-ordination
- Miniature circuit breakers
