Quench detection of multiple magnet system

Magnet protection mandates the detection of any normal zone so that the magnet can be safely discharged. This is usually achieved by having a center voltage tap and two voltage taps at both ends of the windings. The voltage across the two sections of the winding is compared and balanced for inductance. Any voltage signal is then due only to the presence of a normal zone. This method is shown to be inadequate for mutually coupled magnet systems. As a solution to this problem a theory of voltage detection for mutually coupled magnets is presented along with a voltage detection circuit based on Gaussian elimination. The method is confirmed by experiment. Two equivalent solutions are presented which involve either additional voltage taps or the incorporation of dI/dt signals from the coupled magnets.<>