Abstract: A system includes a circuit protection device (CPD) having an input coupled to an aircraft power generator and an output coupled to an aircraft electrical load. A shorting switch is coupled to the input of the CPD. The shorting switch, when closed, provides a fault current path that returns to the aircraft power generator and avoids passing through the CPD and the aircraft electrical load. A controller, based upon the voltage measurements from one or more voltage sensors and current measurements from at least one current sensor selectively opens and closes one or more of the CPD and the shorting switch.

Abstract: An electrical power distribution system can distribute electricity from a source to a load, and can comprise at least one solid state power controller (SSPC) having an input coupled to the source and an output coupled to the load. The SSPC can include an open shunt switch connecting the input to ground. A control circuit can couple to the shunt switch and can be configured to detect a failure in the SSPC. A fuse can be connected between the source and the input. A failure can be detected in the SSPC and the control circuit can close the shunt switch to cause a short circuit that will blow the fuse and isolate the SSPC from the source.

Abstract: One example aspect of the present disclosure is directed to a method for monitoring performance of a plurality of processors, wherein the plurality of processors are arranged in a daisy-chained ring configuration. The method includes receiving, by a first processor from the plurality of processors, a first signal from a second processor of the plurality of processors. The method includes determining, by the first processor, a status of the second processor based at least in part on whether the first received signal was received at a first expected interval. The method includes transmitting, by the first processor, a second signal to a third processor of the plurality of processors, wherein the third processor determines a status of the first processor based at least in part on whether the second signal was received at the third processor at a second expected interval.

Abstract: One example aspect of the present disclosure is directed to a method for monitoring performance of a plurality of processors, wherein the plurality of processors are arranged in a daisy-chained ring configuration. The method includes receiving, by a first processor from the plurality of processors, a first signal from a second processor of the plurality of processors. The method includes determining, by the first processor, a status of the second processor based at least in part on whether the first received signal was received at a first expected interval. The method includes transmitting, by the first processor, a second signal to a third processor of the plurality of processors, wherein the third processor determines a status of the first processor based at least in part on whether the second signal was received at the third processor at a second expected interval.

Abstract: An electrical power distribution system can distribute electricity from a source to a load, and can comprise at least one solid state power controller (SSPC) having an input coupled to the source and an output coupled to the load. The SSPC can include an open shunt switch connecting the input to ground. A control circuit can couple to the shunt switch and can be configured to detect a failure in the SSPC. A fuse can be connected between the source and the input. A failure can be detected in the SSPC and the control circuit can close the shunt switch to cause a short circuit that will blow the fuse and isolate the SSPC from the source.