Surge current protection using superconductors

Introduction
The recent growth of power circuit capacities has caused fault currents to increase. Since the protection of power systems from the fault currents is very important, it is needed to develop a fault current limiter.

A fault current limiter is required to assure (1) rapid reaction to fault currents, (2) how impedance in normal operation and (3) large impedance during fault conditions. A super conducting fault current limiter (SCFCL) can meet these requirements superconductors, bec ....etc

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The recent growth of power circuit capacities has caused fault currents to increase. Since the protection of power systems from the fault currents is very important, it is needed to develop a fault current limiter.

A fault current limiter is required to assure (1) rapid reaction to fault currents, (2) how impedance in normal operation and (3) large impedance during fault conditions. A super conducting fault current limiter (SCFCL) can meet these requirements superconductors, because of their sharp transition from zero resistance at normal cu ....etc

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Voltage surges are unpredictable, momentary increases in voltage. Typically, lightning, inductive switching, or power switching cause surges, which can damage the insulation in building wiring, electrical appliances, or electronic equipment.

Power surges, which can create havoc with today's highly sensitive electrical and electronic equipment, are an unavoidable fact of life. Power surges, both voltage and current, are occurring continually in today?s power systems.

Whether they occur naturally, such as from lightning and static electri ....etc

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The aim of this study is to propose simple and reliable techniques to assess the condition of metal oxide arrester based on the dielectric response techniques. A number of modern electrical diagnostics for Metal Oxide Surge Arrester (MOSA) are discussed in this paper. The techniques included return voltage, decay voltage and polarisation/depolarisation current measurement. The single and multipulse current (8/20micros) was used to artificially degrade the MOSA. The before and after diagnostic ....etc

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Compressor Anti-Surge Control Application Introduction
Surges occur when the compressor outlet pressure is too high in relation to the flow through the compressor. The flow can change rapidly when there is a sudden change in the load that the compressor is expected to deliver. If the surge is not controlled, the compressor can be destroyed. An anti-surge control strategy is designed to protect a compressor from these surges. The typical methods for accomplishing surge control are either a blow-off to at ....etc

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