Design and Implementation of a Real-Time Monitoring and Protection System

The monitoring of electric parameters directly affects energy efficiency. So, this paper presents the design and practical implementation of a real-time remote monitoring system for the load current values of a three-phase power system. The system will protect against overload and give the status of any phase that is overloaded; in addition, it will display the state of the load (normal load or overload) and the status of the circuit braker (on or off). Three current transformers (CTs), three precision rectifier circuits, shunt resistors, a Siemens LOGO! 0A8 PLC, and a circuit breaker make up the proposed system. The functional diagram language is employed for the implementation of the proposed software controller for the protection system. A simulation is made for the proposed controller via the LOGO! Soft Comfort V. 8.3.0 software program for virtual implantation of the program before downloading to the PLC via an Ethernet cable. The proposed system has the property of canceling the trip signal of the circuit breaker during a definite time of the inrush and stating the load current. In addition, an automatic reclosure system returns the circuit breaker to its work when the overcurrent is released. PLC-based protection methods are cheaper and provide greater precision with a safe method of operation when compared with other protection controller systems. The key elements that make up this system are a current sensor interfaced to a PLC, which contains Ethernet properties, and a WiFi router for transmission of data wirelessly to the server. The hosting of a web server page facilitates operators\' viewing and monitoring of the load current of the power system.