International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 04 | Apr-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET ISO 9001:2008 Certified Journal Page 267 Study Of PLC & SCADA Controlled Thermal Power Plant Akash R. Jaiswal 1 , Prof. P.P Jagtap 2 , 1 GHRCE Nagpur 2 Professor, Dept. of Electrical Engineering, GHRCE Nagpur, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Thermal power plant consist of many important equipment which is required for the generation such as boiler ,coal conveyer belt ,ash handling plant ,cooling system etc. These equipment requires continuous inspection and monitoring .this paper outlines the automation of boiler &coal conveyer .Automation leads to greater efficiency &reliability .The automation is achieved by using PLC&, SCADA. PLC & SCADA is connected through communication cable .This paper focuses on passing the inputs to the equipment so that equipment operation must not get affected .SCADA is used for monitoring the operation of equipment and PLC is used to control the operation . The different sensors are used to sense different parameter such as temperature, pressure, tearing of belt, overloading, water level etc. If the parameter exceed the predetermined value the n it is informed by SCADA system to the operator.in order to automate the boiler and coal conveyer belt the ladder logic is developed. The SCADA screen shows the status of equipment so that operator can take necessary corrective action. In case of emergency different automated check valves are used to release pressure, steam and inform the concerned authority through alarm. The most common Faults in coal conveyer belt are belt tear up fault, moisture content and overloading fault Key Words: Communication cables, Programmable Logic Controller (PLC), Power Plant, Supervisory Control and Data Acquisition system (SCADA) 1. Introduction In thermal power plant the demand for higher reliability & efficiency is increasing. Power plant requires continuous inspection & monitoring after regular intervals. There may be chances of errors while measuring at various stages by human workers. In order to increase reliability the automation is needed so that overall efficiency of power plant get improved. The automation is developed by using PLC &SCADA which reduces the errors caused by human workers .PLC is programmable logic control. It is used for implementing various function such as sequencing, timing, counting, logic, athematic control through analog and digital input output modules. In order to store the programme in PLC it must be interfaced to computer via interfacing unit. The programmed can be implemented through various languages. In this paper ladder logic is used for programming .SCADA system is used to supervise a complete process. The output of different sensors is given to the PLC which takes necessary action to control the parameter. SCADA system consist of subsystem such as human machine interface, remote terminal unit, and programmable logic control and communication cable. The alarm system is also provided to inform the operator. SCADA is used to monitor water level, temperature, pressure using different sensors and corresponding output is given to the PLC. For controlling these parameter. In coal conveyer belt the belt tear up, overloading and moisture content is sense by different sensors. The sensor used are IR sensor, temperature sensor, and humidity sensor. 2. Objective To develop a programming for automation of boiler and coal conveyer belt and ash handling plant by using PLC &SCADA .The automation is achieved by developing a ladder logic for controlling various parameter of boiler, coal conveyer belt, and ash handling plant. 3 NEED FOR BOILER AUTOMATION Boiler produces steam at very high temperature. Boiler requires continuous inspection and monitoring at regular interval. Boiler steam temperature in thermal power plant is very high .It is difficult to control boiler temperature manually as it may cause serious injury to human workers. The boiler temperature should not be too high or too low. It must be kept within permissible limits. Various mechanism are used to control the temperature of boiler so that boiler works properly. For reliable operation it is necessary to develop automation for boiler. The automation is achieved by using PLC & SCADA 3.1 BOILER AUTOMATION USING PLC AND SCADA In boiler the control parameters are temperature control, pressure control, and water level control. These parameter are control by temperature sensor, float switches and pressure sensors .Temperature sensors are used to sense the variation in the temperature. Temperature sensor is passive element. RT pressure sensors are used to sense the variation in pressure inside the boiler. Whereas float switches are used to detect the liquid level float switches are available from low range to high range. Float switch output is given to PLC and