Circuit breaker with solid-state trip unit with sampling and lat

Details Circuit breaker with solid-state trip unit with sampling and lat Circuit breaker with solid-state trip unit with sampling and lat

1986-02-10

1987-12-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 50, 364483, H02H 308

Patent

active

047108452

ABSTRACT:
A microprocessor-based digital solid-state trip-unit for processing digital signals derived from analog signals supplied by current sensors. In order to reduce measurement error of the peak value of the signals due to signal sampling, the microprocessor samples a signal latched at the last peak. A countdown timer determines the latching time to include two or three peak values.

REFERENCES:
patent: 4291355 (1981-09-01), Dinger
patent: 4324987 (1982-09-01), Sullivan, II et al.
patent: 4351012 (1982-09-01), Elms et al.
patent: 4371947 (1983-02-01), Fujisawa
patent: 4377836 (1983-03-01), Elms et al.
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4589052 (1986-05-01), Dougherty
IEEE Trans. on Power Apparatus & Syst., vol. PAS-99, No. 1, Janvier/Fevrier 1980, pp. 152-157, IEEE, N.Y., U.S.; E. O. Schweitzer et al.: "Digital Programmable Time-Parameter Relay Offers Versatility and Accuracy", p. .+-.53, Colonne de Droite, Ligne 28-p. 155, Colonne de Gauche, Ligne 13.

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