초록 ▼

A ground fault interruption (GFI) system is incorporated onto a DSP based LRM of an aerospace vehicle. The GFI system operates with digital controls and, unlike the prior art, the system does not employ current transformers. Synchronization pulses are employed to coordinate instantaneous current mea

A ground fault interruption (GFI) system is incorporated onto a DSP based LRM of an aerospace vehicle. The GFI system operates with digital controls and, unlike the prior art, the system does not employ current transformers. Synchronization pulses are employed to coordinate instantaneous current measurement samplings in each phase of a multi-phase power system. Coordinated sampling may reduce phase angle current differential errors and improve operational precision of the GFI system.

대표청구항 ▼

We claim: 1. A power distribution control system with ground fault interruption (GFI) protection, comprising:a current measurement sensor for a first conductor;a current measurement sensor for a second conductor;analog to digital converters to convert current measurements to a first digital represen

We claim: 1. A power distribution control system with ground fault interruption (GFI) protection, comprising:a current measurement sensor for a first conductor;a current measurement sensor for a second conductor;analog to digital converters to convert current measurements to a first digital representation of current in the first conductor and a second digital representation of current in the second conductor;a digital processor that receives the first and second digital representations, calculates differentials between the digital representations and produces a current interruption signal in the event that a calculated differential exceeds a pre-defined value;a solid state switch;a trip engine that receives the current interruption signal from the digital processor and produces a switch-off signal to operate the switch;a synchronization pulse interface interconnected between the trip engine and the digital processor; anda plurality of periodic sampling trip engines that perform periodic sampling operations to gather current measurements from the current sensors,wherein the processor generates synchronization pulses to coordinate the sampling operation of the periodic sampling trip engines so that the current measurement sensors are sampled virtually simultaneously.