Design and Implementation of Transformer Protection Scheme Based on Micro PLC

Abstract

An electrical power system consists of various components such as generators, switches, transmission cables, transformers, capacitor banks among other components. Within these, a transformer is a very valuable and needy device in a power transmission and distribution system and it needs to be protected from the fault that occurred in the power system. A protection scheme is presented in this paper, which can be used in transformer protection. The main intention of this proposed system is to design a micro- PLC-based system that checks the operating parameters of the transformer i.e., voltage, temperature, oil pressure and the quantity of current that is flowing through the transformer. The system is able to detect current above the normal operating level and isolate the power transformer from the distribution line. This isolation process is to ensure that the transformer is protected from any abundance current that can cause it to overheat consequently to be harmed. In addition, the designed system can isolate the transformer if the voltage, temperature, and pressure are higher than its normal operating value. Some of the tools used in this protection system include LDmicro- programming software to write the ladder logic diagram for the microcontroller. Proteus-simulation software has also been used to design the circuit diagram and the Printed Circuit Board (PCB) for its implementation on hardware.