Electronic trip device comprising, in series, finite and infinit

Details Electronic trip device comprising, in series, finite and infinit Electronic trip device comprising, in series, finite and infinit

1997-11-25

2000-05-30

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, H02H 300

Patent

active

060697806

ABSTRACT:
The electronic trip device comprises in series for each phase of a power system a sampler, a squaring circuit and a finite impulse response (FIR) filter. A maximum circuit is connected to the output of the FIR filters and to the input of an infinite impulse response filter. A comparison circuit for comparison to thresholds is connected to the output of the IIR filter. It is thus possible to obtain both a good precision and good filtering of the harmonics of the frequencies of conventional power systems (50 Hz, 60 Hz and 400 Hz), and to reduce the necessary computing power, and consequently the cost of the trip device.

REFERENCES:
Proceedings of 1979 ISCAS, "Hybrid Implementation of Narrow Band Digital Filters," by Martinez et al. pp. 364-365. No Month.
Patent Abstracts of Japan, vol. 16, No. 120, JP 3-289270. Dec. 19, 1991.

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