–- Direct Shorts
–- Excessive Current, and
–- Excessive Heat
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» Why We Need Protection System? (Cont…)
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• The objective of power system protection is to isolate a faulty section of electrical power system from rest of the live system ...
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• The role of the building protection system is to protect it against direct lightning strokes. The system consists of: – - the ca... -
• For convenience and to limit the extent of the power system that is disconnected when a fault occurs, power system is divided into ... -
The short-circuit current from various sources is illustrated in figure 2-1. Since short-circuit current from rotating machines varies ...
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• When a fault occurs, the protection scheme is required to trip only those circuit breakers whose operation is required to isolate t...
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• Symmetrical fault current: If in a circuit mainly containing reactance, a short circuit occurs at the peak of the voltage wave, th... -
A short circuit is one of the major incidents affecting electrical systems. The consequences are often serious, if not dramatic: ... -
OVERHEAD LINE FAULTS : 1. 1. Lightning surge overvoltage cause by shielding failures or black flashover events which are transient...
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• According different criteria there are different types of circuit breaker . • According to their arc quenching media the circuit...
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Lightning damages electrical and electronic systems in particular: transformers, electricity meters and electrical appliances on both r...
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