–- Direct Shorts
–- Excessive Current, and
–- Excessive Heat
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» Why We Need Protection System? (Cont…)
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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... -
A short circuit is one of the major incidents affecting electrical systems. The consequences are often serious, if not dramatic: ... -
• It is not practical to design and build electrical equipment or networks so as to completely eliminate the possibility of failure i... -
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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• 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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Lightning damages electrical and electronic systems in particular: transformers, electricity meters and electrical appliances on both r... -
• The circuit breaker mainly consists of fixed contacts and moving contacts. In normal "on" condition of circuit breaker, 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... -
• According different criteria there are different types of circuit breaker . • According to their arc quenching media the circuit...
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• “Symmetrical" and “Asymmetrical” are terms used to describe the symmetry of the short-circuit current waveform around the zer...
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