Differential current fault protection for a system utilizing a p

Details Differential current fault protection for a system utilizing a p Differential current fault protection for a system utilizing a p

1993-07-28

1996-05-28

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 44, 361113, 361115, H02H 300

Patent

active

055217877

ABSTRACT:
A system of protection which utilizes a simple circuit for the detection and isolation of single and multiple phase to phase and phase to neutral faults between a multi-phase source of electrical energy and a power conversion device driven therefrom. The circuit comprises a current transformer positioned at the neutral aspect of each phase winding of the multi-phase source of electrical energy. These current transformers sense the current generated by the source of electrical energy and produce a signal of proportional magnitude thereby. These proportional sense signals from each of the individual current transformers are transmitted to a controller which vectorially adds these signals to produce a single summed output signal. The controller monitors the percent ripple content of the summed output signal and generates an output protection signal if the percent ripple content of the monitored summed output signal exceeds a predetermined threshold value for a predetermined time interval. Means are provided responsive to the output protection signal for de-energizing the multi-phase source of electrical energy.

REFERENCES:
patent: 4034267 (1977-07-01), Wilson
patent: 4331882 (1982-05-01), Hingorani
patent: 4347540 (1982-08-01), Gary et al.

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