Circuit breaker with digital solid-state trip unit fitted with a

Details Circuit breaker with digital solid-state trip unit fitted with a Circuit breaker with digital solid-state trip unit fitted with a

1986-02-10

1987-07-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 364483, H02H 3093

Patent

active

046822640

ABSTRACT:
Microprocessor-based solid-state trip unit (48) processing digital signals derived from analog signals supplied by current sensors (16). The analog signals are applied to a calibration circuit (34), which adapts the output range of the analog circuits to that of the logic circuits, to obtain with an 8-bit Analog-to-Digital Converter (50) associated with a Multiplexer (29) a range equivalent to that of 12-bit processing systems.

REFERENCES:
patent: 4351012 (1982-07-01), Elms et al.
patent: 4365302 (1982-12-01), Elms
patent: 4470092 (1984-09-01), Lombardi
patent: 4531089 (1985-07-01), Ishizuka et al.

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