Patent ID: 6700222
Filing Date: 2004-03-02
Classification: H02J

Abstract:
A power transfer apparatus for selectively connecting first and second variable frequency generators to a distribution bus, the apparatus comprising a controller and first and second connection devices, each comprising an electromechanical contactor in parallel with an associated solid state switch, in which in response to a change over request to change from the first to the second generator the controller is arranged to monitor the respective outputs of the first and second generators in order to determine when the outputs are matched to within a predetermined range, and to operate the connection devices to switch the distribution bus from one generator to the other when their outputs are matched, such that during changeover current flow occurs via the solid state switches with the first generator being disconnected before the second generator is connected and wherein the closing of the solid state switch associated with the second generator is performed immediately after the solid state switch associated with the first generator has opened.