Electrical Protection

introduction
The Electrical Protection training course will look into the fundamental and critical aspects of electrical installations. Protection is applied on a component basis. Relays are associated with each significant component of the power distribution system to detect various forms of distress associated with those components. If one of those relays operates, which means that an output contact protective device, which then isolates the defective system components. It may be convenient to think of the circuit breaker as the muscle that does the work of isolating the component, while the relay is the brain, which decides that isolation is required.
OBJECTIVES
By the end of this training course, participants will be able to:
• Appreciate the practical solutions for specifying the correct type of electrical protection
• Understand comprehensive understanding of principles and selection of relays
• Develop design of protection schemes
• Learn the construction and functions of instrument transformers
• Explain types grounding system and earthing fault protection

Course Outline
DAY 1
Types of Electrical Protection Devices and Faults
• Importance of Electrical Protection and Control Devices
• Types of Electrical Faults
• Characteristics of High Voltage Fuses for Electrical Protection
• Characteristics of Circuit Breakers for Electrical Protection
• Microprocessor Overcurrent Relays
• Time, Current, Curves and Logic Discrimination
• Hot and Cold Tripping Curves
• LV Switchboard Protection against Short Circuit
DAY 2
Protection Functions and Instrument Transformers
• Power System Architecture
• Protection Functions
• Selective Coordination
• Lock out and anti-pumping relays
• Sensors
• Current and Voltage Instrument Transformers
• Types of Relays
• Numerical Relays and Functions

DAY 3
Busbar, Transformer and Motor Protection Systems
• Busbar Protection
• Transformer Protection
• Motor Protection
• Capacitor Protection
• Overhead Line Protection
• Type of Related Faults
• Relevant Protection Functions
• Protection device coordination
DAY 4
Grounding Systems and Earth Fault Protection
• Overcurrent Protection for Phase and Earth Faults
• Unit Protection Schemes
• Distance Protection
• Protection of Feeders against Overload and Short Circuit
• Types of Grounding System
• Restricted Earth Fault Protection
• Sensitive Earth Fault Protection
• Protection against Over-voltages
DAY 5
Methods of Commissioning Relays, Short Circuit Current Calculation and Harmonics
• Commissioning of Protective Relays
• Calculation of Short Circuit Current
• Fault Topologies
• Short Circuit Current at Fault Point
• Positive, Negative and Zero Sequence Systems
• Triple Harmonics Effects and Mitigation Techniques
• Wrap-up Session
• Q&A Session