Micro-Processor Based Leakage Current Detector with Annunciation and Micro-Processor Based Leakage Current Realy with Free Connects

摘要

PURPOSE: A leakage relay having a leakage alarm function using a microprocessor is provided to set up a leakage current value, display the amount of leakage, and perform a leakage alarm function by using digital data. CONSTITUTION: A plurality of leakage sensors(4) is installed at each load in order to measure the leakage amount of wires and the loads. A multiplexer(6) receives the amount of leakage from the leakage sensors(4) and outputs the amount of leakage, sequentially. An amplifier(8) amplifies the leakage amount of the multiplexer(6). An analog/digital converter(10) is used for converting analog leakage signals of the amplifier(8) to digital leakage signals. A display portion(22) is used for displaying the amount of leakage. A microprocessor(12) is used for controlling the display portion(22) and the multiplexer(6).