Power plant's data acquisition system
October 2003
Data Acquisition & Telemetry
The ADAM-5000 modules were successfully used in a PC-based data acquisition system between a power plant's turbine room and a power generator room. The task was complicated by the long distance between the two rooms but was completed within a low budget.
The power plant is equipped with two turbine boilers. Each boiler room includes one turbine engine and one power generator. The plant layout is rather awkward since these two machines are 150 m apart and 400 m from the central control room making data collection and machine control difficult.
A distributed data acquisition and control system was chosen. It had to provide a fast response time, good resistance to electrical noise and complete I/O module support. It also had to be reliable with a user-friendly software interface. The system uses the ADAM-5000 series data acquisition and control system, an IPC-610 industrial PC and the Windows-based VisiDAQ application software development package. The control system communicates via an RS485 network and communication in critical areas such as near boilers and generators and the control centre is conducted through fibre-optic cables.
Each ADAM-5000 system comprises a main unit with a CPU and backplane slots, into which up to four I/O modules can be inserted. Each I/O module can support from three to 16 analog, digital, thermocouple, RTD or relay input channels, or analog or digital output channels. The main unit's three-way voltage isolation design provides 3 kV d.c. isolation between the power supply or plug-in modules and the main unit, and 2,5 kV d.c. isolation between the RS485 communication line and the main unit. This protects against ground loops and electrical noise such as that created by the boiler and generator. RS485 networks support communication speeds up to 115,2 Kbs at distances over 1200 m.
VisiDAQ is an easy to use, flexible, man-machine interface design package. It allows users to design an MMI that provides realtime data display, data logging, alarm functions, trending and report generation. By using the new system, monitoring of critical plant variables and plant security were greatly improved, power generation costs were decreased and plant security and efficiency were increased.
For more information contact Elton Prytz, ProMicro, 011 706 7913, [email protected], www.promicro.co.za
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