Pump station monitoring

April 2008 Data Acquisition & Telemetry

The vast topography of Namibia has always been a challenge when it comes to centralised monitoring and control of water pump stations, dams and reservoirs within the area. However, advancements in GPRS technology now make it possible to utilise the GSM networks as a wide area communications platform for telemetry applications. The combination of GPRS and an existing high speed MDS digital radio network have proved the perfect communications platform for covering the vast distributed water network in Namibia. Namwater engineers have taken advantage of this technology and have implemented the first GPRS telemetry application at a new booster pump station.

System description

The pump station under control is situated some 60 km away from the Citect master station. The remote station is covered by the Namwater Radio network as well as the GSM network. SSE Maestro remote telemetry units (RTUs) were installed at the pump and master stations. At the master station the SSE Picasso OPC server was installed to interface between the Citect scada and the RTU. The server can also be used to program the remote RTU from the master station.

Comparative results

The SSE RTU allows simultaneous connectivity to a number of wide area networks, in this case radio and GSM. Transmission times proved to be well within the requirements for telemetry applications of this type on both networks, the average latency being 2 to 3 seconds. To avoid event time differences, the outstation timestamps and logs the data and the scada trends are back filled for accuracy and alarm reporting at the master station user interface.

Conclusion

Applications such as the Namwater water telemetry system now have the ability to utilise GSM in conjunction with the existing high-speed digital radio networks. The benefit of this going forward is that areas not covered by existing radio can employ the GSM network to achieve the same results. Costly RF network extensions are not required when there is GSM coverage in the area.

For more information contact Clive Maasch, SSE Group, +27 (0)21 552 0420, [email protected], www.sse.co.za

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