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Types of Circuit Breaker
Working Principle of Circuit Breaker
Introduction to Circuit Breaker
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Types of Protective Relays
Relay Classifications
Principles of Relay Application
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Objectives of Power System Protection
• The objective of power system protection is to isolate a faulty section of electrical power system from rest of the live system ...
Lightning Protection System of Buildings
• The role of the building protection system is to protect it against direct lightning strokes. The system consists of: – - the ca...
Zones of Power System Protection
• For convenience and to limit the extent of the power system that is disconnected when a fault occurs, power system is divided into ...
Time Variation of Short-circuit Current
The short-circuit current from various sources is illustrated in figure 2-1. Since short-circuit current from rotating machines varies ...
Selective tripping or Discrimination
• When a fault occurs, the protection scheme is required to trip only those circuit breakers whose operation is required to isolate t...
Symmetrical and Asymmetrical Fault Current
• Symmetrical fault current: If in a circuit mainly containing reactance, a short circuit occurs at the peak of the voltage wave, th...
Consequences of Short-Circuit Currents
A short circuit is one of the major incidents affecting electrical systems. The consequences are often serious, if not dramatic: ...
Faults in the Power System Components
OVERHEAD LINE FAULTS : 1. 1. Lightning surge overvoltage cause by shielding failures or black flashover events which are transient...
Types of Circuit Breaker
• According different criteria there are different types of circuit breaker . • According to their arc quenching media the circuit...
Effects of Lightning on Electrical Installations
Lightning damages electrical and electronic systems in particular: transformers, electricity meters and electrical appliances on both r...