Normal zone detectors for a large number of inductively coupled coils
Abstract
In order to protect a set of inductively coupled superconducting magnets, it is necessary to locate and measure normal zone voltages that are small compared with the mutual and selfinduced voltages. The method described uses two sets of voltage measurements to locate and measure one or more normal zones in any number of coupled coils. One set of voltages is the outputs of bridges that balance out the selfinduced voltages. The other set of voltages can be the voltages across the coils, although alternatives are possible. The two sets of equations form a single combined set of equations. Each normal zone location or combination of normal zones has a set of these combined equations associated with it. It is demonstrated that the normal zone can be located and the correct set chosen, allowing determination of the size of the normal zone. Only a few operations take place in a working detector: multiplication of a constant, addition, and simple decision making. In many cases the detector for each coil, although weakly linked to the other detectors, can be considered to be independent.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 January 1983
 Bibcode:
 1983STIN...8324789O
 Keywords:

 Bridges (Structures);
 Decision Making;
 Electric Potential;
 Inductance;
 Measuring Instruments;
 Safety;
 Superconducting Magnets;
 Coupling Coefficients;
 Data Acquisition;
 Errors;
 Graphs (Charts);
 Magnetic Coils;
 Mathematical Models;
 Matrix Methods;
 Simulation;
 Electronics and Electrical Engineering