E.ON Czech Republic is a distributor of natural gas in South Bohemia. The object of the company is to maintain the reliability of the gas distribution system in the region and secure the continuous supply of natural gas to its customers. The main shareholders of the company are Oberösterreichische Ferngas AG Linz and E.ON Czech Holding AG München.
The company decided to innovate its main control system in 1999. After thoroughly evaluating several SCADA systems, the company chose the Reliance SCADA/HMI system. The aim of the new system was to visualize all interchange super high-pressure and high-pressure regulator stations.
The approach of the company has been very active since the beginning. Employees at the gas distribution company wanted to create and maintain the visualization by themselves, so after creating the basic project for several first regulator stations, technicians were well trained to be able to maintain and expand the system by themselves.
Several hundreds of gas pressure regulator stations have been modernized and connected to the system since 1999. In 2005, the conversion was completed. The system now consists of more than 300 gas pressure regulator stations connected to the main control room via GPRS, radio modems, and modems 24 hours a day.
A gas regulator station
The structure of the control system
This computer communicates data from the regulator stations using GPRS, modems, and radio modems. There is a special multiport card in the computer. Data is distributed over the network to the main control room's PC and data storage + WWW server via TCP/IP.
The main control system computer is equipped with two LCD displays for an enhanced overview of the system and alarms. Incoming data and alarms are synchronized among all computers in the system. The control room manager can send commands to any gas regulator station via the data communication PC.
A picture of the main control room
This server stores data received from the system to the ORACLE database. It also acts as a Web server for Web clients that can access process data from the company's intranet. Another important task of this server is to export data from the control system to the company's customer information system and gas consumption prediction system. Selected data is also automatically transferred to the national central gas control room in Prague via FTP.
A map of the gas distribution pipeline system
Overview windows display the key values from the system including information about alarms. Data is communicated periodically, but if the control room manager needs to get the fresh data instantly, he can get it by clicking the yellow "Call" button in the system.
The control room manager can go anytime from the overview screen to the detailed process scheme of a regulator station.
In the detailed process scheme, displays with values are located in the position where the value sensor is installed. Values of pressure, temperature, and gas volume are monitored. The key information is the status of gas secure flaps. If necessary, the control room manager can establish on-line communication with the regulator station and observe it "live" to see if something happens in the station.
All the values stored in the archive can be presented either in trends or tables. There are hi and lo limits displayed together with the value. Responsible people can go through the history and make data analysis (for example, compare the trend of the value with the same time period of previous years). Data is exported to the company's central data storage system. The ORACLE database is used as the main database system.
Data stored in the archive can be presented in various kinds of statistical reports (hourly, daily, monthly). Statistical items as a minimum, maximum, average, or sum of the selected value is displayed in the report, too. Reports can also be printed out.
Try the Reliance SCADA/HMI system on several example projects or download the installer of the trial version for free.
Visualization and control of the gas distribution pipeline system for South Bohemia
Over 300 QMD, DMB, MPC telemetry systems communicated over modems, radiomodems, and GPRS
1 x Reliance Design Enterprise with an unlimited number of data points
1 x Reliance Server with an unlimited number of data points
2 x Reliance Runtime Control with an unlimited number of data points
18 x Reliance J Web clients
202 x Reliance Runtime Control with 100 data points