Electricity: measuring and testing – Electromechanical switching device – Circuit breaker
Patent
1998-03-05
2000-08-01
Ballato, Josie
Electricity: measuring and testing
Electromechanical switching device
Circuit breaker
361 94, G01R 3132
Patent
active
060971924
ABSTRACT:
A method of initializing short time and groundfault protection heat index accumulators to compensate for current flow during the time interval between the application of phase current and application of current measurement and protection algorithms in an electronic trip unit is presented. The electronic trip unit includes a microcontroller and associated ROM having trip unit application code, e.g., main functionality firmware, including initializing parameters, and boot code, stored therein and EEPROM having operational parameter code, e.g., encoded enumerations for parameters such as 50/60 Hz., UL/ANSI/IEC, etc., stored therein. The time internal comprises first and second time components. The first time component is the time between the instant phase currents are applied and the instant the microcontroller is initialized and the second time component is the time between the instant the microcontroller is initialized and the instant the microcontroller begins execution of short time and groundfault algorithms (i.e., protection algorithms). The first time component is approximated by applying an initial current measurement to index a calibrator. The second time component is measured by a counter controlled by the initialization firmware. The first and second time components are applied to the initial current measurement (or a derivative thereof) to determine an initial value (or a component thereof), for short time and/or groundfault heat index accumulators.
REFERENCES:
patent: 4589052 (1986-05-01), Dougherty
patent: 4814712 (1989-03-01), Burton et al.
Koller Michael R.
Obermeier Mark J.
Singer Paul H.
Ballato Josie
General Electric Company
Horton Carl B.
Nguyen Vincent Q.
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