PLC based load limiter

Abstract

Alternating current and power use in home or building can be controlled using a load limiter to reduce electric cost. This project proposes a load limiter that detects excess of alternating current and power supplied to the load and controls the power supply. The load limiter consists of a current transducer meter and a Kilowatt meter and programmable logic controller. The programmable logic controller read the input values from the current transducer meter and Kilo-watt meter and controlled the power supply to the load. A controlling program was written using superCAD software to perform the detection and control process. When there is an excess of power usage, the programmable logic controller sent a signal to the contactor to disconnect the power supply to the load.