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Super Conducting Fault Current Limiters - Papers Online

Super Conducting Fault Current Limiters

The recent growth of power circuit capacities has caused fault currents to increase. Damage from a short circuit is a constant threat to any electric power system. Insulation damaged by aging an accident or lightning strike can unloose immense fault currents practically the only limit on their size being the impedance of the system between their location and power sources. All power system components must be designed to withstand short circuit stresses for certain period.The higher the fault currentsthe higher will be the equipment and also the maintenance cost.So there obviously is a big demand for devices that under normal operating conditions have negligible influence on power ...

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sufficiently large impedance under fault conditions. Provide rapid detection and initiation of limiting action within less than one cycle or 16ms.Provide immediate (half cycle or 8ms) recovery of normal operation after clearing of a fault.Be capable of addressing tow faults within a period of 15 seconds.
Before examining super conducting fault current limiters some characteristics Of non-linear material deserve a closer clock.Super conductors because of their sharp transition from zero resistance at normal currents to finite resistance at higher current densities are tailor made for use in fault current limiters.A simplified phase diagram of a super conductor defines three regions.(Diagram)
In the innermost, where values for temperature, field, and current density are low enough, the material is in its true superconducting state and has zero resistance. In a region surrounding that area, resistively rises steeply as values for three variables so higher. Outside that area, ...

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Super Conducting Fault Current Limiters. (2011, February 25). Retrieved November 28, 2024, from http://www.essayworld.com/essays/Super-Conducting-Fault-Current-Limiters/95278

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PAPER DETAILS

Added: 2/25/2011 04:34:38 AM
Submitted By: pintu2050
Category: Science & Nature
Type: Premium Paper
Words: 1133
Pages: 5

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