International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 03 | Mar -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
MONITORING OF DISTRIBUTION TRANSFORMER PARAMETERS USING PLC Shubhangi Landge¹, Snehal Waydande², Sanjay Sangale³, Somesh Gaikwad⁴ ¹Assistant Professor, Dept. Of Electrical Engineering, AISSMS IOIT College, Maharashtra, India 234Pune
University, AISSMS IOIT College, Maharashtra, India
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Abstract : Main aim of studying this paper is to design and implementation of PLC (programmable logic controllers) automation to monitor as well as to diagnose condition such as load, currents, transformer temperatures and voltages of the Distribution transformers of substation which is one of the most important equipment in the power system network. The Data acquisition, condition monitoring, automatic controlling are important issues as there are large no of transformers and various components over a wide area in power system. In proposed system with PLC, relays and sensors are used to detect the faults of transformer such as overloading, overvoltage, under-voltage, phase to phase fault and over temperature faults. Probability of faults on distribution transformers is undoubtedly more and hence protection of transformer is highly essential. Automation control is used for various systems for operation of equipments. Some processes are completely automated. Benefit of automation is it saves labor and saves energy and material; improve quality, accuracy and precision. Reduces dependency on human presence and decision making for any process
Keywords-PLC automation, Distribution transformer, Relays, sensors, Monitoring. 1. INTRODUCTION A distribution transformer is a transformer that provides the final voltage transformation in the electrical power distribution system stepping down the voltage used in the distribution lines to the level used by the customer. Distribution transformers normally have ratings less than 200 KVA although some national standards can allow for unit up to 5000 KVA to be described as distribution transformer. Since these transformers are energized for 24 hours a day, its proper working is very important and so a strong protection is required. The main concern of this paper is to rescue the distribution transformer in power system network against the internal and external faults. Overloading of transformer beyond the rating can cause a rise in temperature of both transformer oil and winding, overloading is nothing but it is an over current fault occurring on secondary side of distribution transformer or rise in the load. Increase in the winding temperature will increase the stress on the insulation, and then insulation deteriorates and may fail. Power system faults external to transformer can increase or decrease the voltage of the transformer, which leads to overvoltage or under-voltage fault. When fault occurs current increases, and hence a comprehensive transformer protection scheme needs to include protection against overvoltage, under-voltage, overload, phase to phase fault and over temperature. Following system is a proposed system which consist all this protections.
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