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Unformatted text preview: reated by the fault has a very harmful effect on the service rendered by the
power system. If the voltage remains low for even a few seconds, the consumers’ motors may be shut
down and generators on the power system may become unstable.
Due to above deterimental effects of short-circuit, it is desirable and necessary to disconnect the
faulty section and restore normal voltage and current conditions as quickly as possible. Short-Circuit Currents
16.7 Short-Circuit Currents
Most of the failures on the power system lead to short-circuit fault and cause heavy current to flow in
the system. The calculations of these short-circuit currents are important for the following reasons :
(i) A short-circuit on the power system is cleared by a circuit breaker or a fuse. It is necessary,
therefore, to know the maximum possible values of short-circuit current so that switchgear
of suitable rating may be installed to interrupt them.
(ii) The magnitude of short-circuit current determines the setting and sometimes the types and
location of protective system.
(iii) The magnitude...
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This note was uploaded on 11/12/2012 for the course MBA 101 taught by Professor Muhannad during the Spring '12 term at Bradford School of Business.
- Spring '12