Power dampener for a fault current limiter

Abstract

A method of dampening a transient in a DC biasing coil in a fault current limiter, the method including the step of: interconnecting a transient suppression circuit across the DC biasing coil, the transient suppression circuit being operative when the transient voltage across the DC biasing coil exceeds a predetermined maximum.

Description

technical field The present invention relates to superconducting fault current limiter devices. Background technique The application of superconducting fault current limiters is known to have great potential in protecting electrical circuits from phase-to-phase faults and single-phase-to-ground faults. Examples of superconducting fault current limiter devices can be found in the following patents: Darmann et al. US Patent 7,193,825; Yuan et al. US Patent 6,809,910; Boenig US Patent 5,726,848; and Walker et al. patent application. Using the Darmann patent as an example, these devices may operate with a DC bias coil placed around a magnetic core to bias the core to magnetic saturation. Once a fault occurs, this core loses saturation, which creates a considerable reluctance relative to the fault. Other current limiter devices typically utilize manipulation of the magnetic properties of the magnetic core. In the operation of most fault current limiter devices, when a fault...

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Problems solved by technology

This is because the voltage ratio detection circuit will not work correctly

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