Rolls-royce Corporation

Andrew John Forsyth

David Reginald Trainer

John J A Cullen

Alan J Mitcham

Chunjiang Jia

Ding Wu

Andrew M Cross

Ahmed A-m Abdel-Hafez

Ahmed Abdel-Malek Electrical Eng: Dept: Faculty Of Engineering Assint University Abdel-Hafez

Alan John Mitcham

Andrew Mark Cross

An apparatuscomprising a cryogenic chamberand a galvanic input interfaceto the cryogenic chamberconfigured to receive a lower amplitude electric current. A converteris located within the cryogenic chamberand configured to convert the lower amplitude electric current, provided by the galvanic input interface, to a higher amplitude electric currentfor supply to a loadwithin the cryogenic chamber. A controlleris configured to control the converterand to detect the onset of quench by comparing the duration of the charge/discharge cycle of the convertor with a stored value. The controllermay also compare an instantaneous value of load current with a stored value of load current.

Cryogenic power control

A synchronous electrical machine having a plurality of phases, a detecting unit arranged to detect a fault in at least one of the phases of the synchronous electrical machine, an isolating unit arranged to isolate the at least one phase of the synchronous electrical machine with the fault, a phase shift unit arranged to produce a controlled phase shift between the voltage and the current within the remaining phases of the synchronous electrical machine to adjust the phase angle and magnitude of the second harmonic powers produced by the remaining phases of the synchronous electrical machine such that the vector sum of the second harmonic power vectors of the remaining phases of the synchronous electrical machine is zero.

Synchronous electrical machine

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Manchester, United Kingdom

Andrew John Forsyth