IMPROVED ELECTRONIC TRIP UNIT FOR CIRCUIT BREAKERS

摘要

The present invention provides improved electronic trip unit for circuit breakers. In the present invention, a single microcontroller would perform the tasks of signal monitoring and metering, providing protection against electrical fault with indication and event record, communicating to a remote location and driving an LCD without using an intermediate driver. The LCD display is controlled by interfacing it directly with the controller without requiring a driver. The functionality of the driver is emulated in the firmware providing a low cost display that requires lower number of I/O pins.