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Showing posts with label SCADA. Show all posts
Showing posts with label SCADA. Show all posts

Friday, April 4, 2014

SCADA System Applications

Applications of SCADA:

SCADA (Supervisory Control and Data Acquisition) systems have a wide range of applications. SCADA technology is widely used where the process systems spread in wide range of area away from control center. These process system applications require control, monitor and frequent intervention for better operation of the system. In these applications the process system can be controlled by Master Station through two way communication. Control applications of SCADA includes opening and closing switches, circuit breakers, valves, and starting and stopping of the motors etc.


Applications in power plant control:

A group of Hydro and Gas generation plants are to be started when the load demand exceeds the generating capacity, these plants are considered as peak load plants because these plants can start in no time and deliver power to the grid. These plants will be located in the remote locations. These plants can be controlled by opening and closing the valves of the turbine so that they can deliver the power in peak conditions and can be kept on standby during normal load conditions.


Applications in Oil and Gas Industry:

Many process control parameters and equipments such as fluid measurement equipment, gathering systems and pumps which are spread over the wide area in the field. Control and monitoring applications include turning on and off the motors and pumps, gathering meter information of various process parameters (pressure, viscosity, flow rate..) continuously and takes certain decisions. This can be done through SCADA systems which monitor and control the processes.


Applications in pipelines:

Pipelines carrying oil, gas, chemicals and water which are located at varying distance from the plant needs continuous monitor and control. Control includes opening and closing of valves, starting and stopping the pumps.  Monitoring the flow rate, and other parameters to avoid leakage in the pipelines by acquiring the data and carrying out suitable controls if required through SCADA systems


Applications in Power Transmission:

Electrical power transmission which is spread over thousands of kilometers can be controlled by opening and closing of the circuit breakers and other functions, this is done in master control substation which can control the other substations through SCADA systems.


Application in Irrigation system:


Irrigation systems which are spread over wide area can be controlled by closing or opening the valves, gather the meter values of amount of water supplied and can control from the master station if required.

SCADA Systems Interview Questions and Answers

SCADA Interview Questions 2013:

Different Levels of SCADA?

Answer: Different levels are SCADA systems are:

  1. Field level devices and instruments eg: Sensors
  2. Remote Terminal Units (RTUs)
  3. Communication system present between the RTUs and Main Station
  4. Main Control Station or Master Station
  5. Computer systems pertained to processing the data for displaying to operator

Why SCADA systems are Implemented?
Answer: Some of the reasons or advantages why SCADA systems are implemented are:

  1. SCADA systems improves the performance of the operation of the plant
  2. SCADA systems provides better protection to the equipment of the plant
  3. SCADA systems improves productivity of the personnel
  4. Information receives very fast, process the information and display it to opertor in graphs and plots. Hence helps the operator to take the decisions fast.
  5. Provides better energy savings and saves economy.


What is the capacity of CPU of Remote Terminal Unit (RTU)?
Answer: Remote Terminal Units (RTUs) contain generally microprocessor having 16 bit or 32 bit (eg: 68302 or 80386)

What is the Power Supply provided to the RTU?
Answer: Remote Terminal Units (RTUs) are operated from 110V/240V + or - 10% and 50Hz or 12/24/48V + or - 10% DC Voltage

What are advantages of PLCs over RTUs?

Answer: Advantages of Programmable Logic Controllers (PLCs) are they can be used for general purpose can easily set for verity of functions. Some of the advantages of PLCs over RTUs are: PLCs are reliable, cheap, flexible compared to RTUs, sophisticated control and troubleshooting in PLC is easier.