INTERRUTTORE DI CIRCUITO PROVVISTODI MEZZI DI VISUALIZZAZIONE E DI IMMISSIONE DI PARAMETRI MULTIPLI

• Main Authors: MERCIER BERNARD J, ENGEL JOSEPH C, WAFER JOHN A, MATSKO JOSEPH J
• Format: Patent
• Language: Italian
• Published: 29.09.1989
• Edition: 4
• Subjects: BASIC ELECTRIC ELEMENTS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; EMERGENCY PROTECTIVE DEVICES; GENERATION; RELAYS; SELECTORS

A circuit interrupter includes a microcomputer-based trip unit, and a display and control panel comprising a numeric display device and a plurality of legends associated with light-emitting diodes. The trip unit presents a sequential display of numeric values of associated circuit electrical parameters and time-current trip characteristic setting values, with the currently visible numeric quantity being identified by an energized light emitting diode and associated legend. The control panel also includes a test switch for initiating a test operation and a potentiometer for selecting a desired simulated fault current value for the test operation. The test capability is provided simultaneously with normal circuit breaker operation which maintains full protection of the associated circuit. A short-delay feature is provided having a selectable i2t characteristic with adjustment of both pick-up and time parameters.