G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/06 (2006.01) G01R 33/12 (2006.01)
Patent
CA 2060921
ABSTRACT A method and apparatus for detecting and locating a quench zone in a superconducting coil is provided, A sensor is positioned adjacent to and in heat transfer communication with the superconducting coil along the entire length of the superconducting coil. When a portion of the superconducting coil becomes normal, the adjacent portion of the sensor becomes resistive. A series of electrical pulses are sent along the sensor. At a normal zone, the discontinuity in impedance which occurs at such a zone, causes a reflective pulse to be sent back along the sensor. In addition, the sensor may be short-circuited at one end so that a return pulse opposite in polarity to the transmitted pulse will be reflected from that end. Alternatively, the sensor may be open-circuited at the end and a return pulse of the same polarity as the transmitted pulse is reflected back. Yet a further embodiment includes a resistive component of a predetermined value at the termination end. The reflective pulses and the echo pulses are detected by an associated receiver and processor which calculate the location of the resistive zone along the sensor and the corresponding quench zone along the superconducting coil using information derived from the pulses. A second embodiment provides two sensors which are adjacent to and in heat transfer communication with the coil which are pulsed from opposite ends. This provides additional information about the quench zone and also provides redundancy in the system. An associated method is also provided.
Logan James Randall
Shook Eric Paul
Wolfe William Richard
Bereskin & Parr
Westinghouse Electric Corporation
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