Circuit breaker static trip unit having automatic circuit trimmi

Details Circuit breaker static trip unit having automatic circuit trimmi Circuit breaker static trip unit having automatic circuit trimmi

1984-05-21

1985-10-29

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 364483, H02H 316

Patent

active

045503605

ABSTRACT:
An analog signal processor used within a static trip unit is provided with an A/D converter, a digital processor and an electrically alterable non-volatile memory (EAROM) for providing trimming and calibration facility to the trip unit. The EAROM provides the ability to store parameters calculated by the user during the manufacturing process of the trip unit. Key measured or environmental variables are created and a correction algorithm is generated and stored along with data. The trip unit is then capable of self-calibration by applying the correction factor to compensate for variations in the component sensitivity. In one application, the current sensing transformer is precalibrated and provided with a correction factor and a correction algorithm. In another application, the thick film resistors within the long term trip mode network, the short term trip mode network and the power supply voltage regulator are "trimmed" by means of stored correction values.

REFERENCES:
patent: 3922587 (1975-11-01), Jones
patent: 4271444 (1981-06-01), Howell
patent: 4297741 (1981-10-01), Howell
patent: 4454557 (1984-06-01), Hurley

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