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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 8. COMMUNICATIONS AND CONTROL SYSTEMS 8.1 Communications and Remote Monitoring Chena Power installed a dedicated dsl satellite system to allow remote monitoring of the power plant from any location around the world. There is also a phone line installed in the control room. The communication and data collection system is designed to accomplish several tasks: 1) Allow for alarms and alerts to be sent out in the case of potential problems with the unit. Because a constant grid is provided to the site via a UPS/battery bank, a power outage is not immediately apparent. The com system is designed to notify a monitoring system at UTRC, and send out automated calls to relevant individuals, including the front desk of Chena Hot Springs Resort, which is staffed 24 hours a day. 2) Allow continual data logging of system components, including pressures and temperatures throughout the system, power output, flow rates for refrigerant and water, etc. This is automatically transmitted back to UTRC where it is analyzed to trouble shoot any potential problems and note any changes in performance. 3) Permit remote real-time system logon capability so UTRC operators can control and monitor the system in Hartford Connecticut as easily as if they were onsite. Figure 18. Fred Cogswell (UTRC) trains Gwen Holdmann (Chena) on systems operation. 8.2 System Controls and Monitoring Carrier CC6400 programmable controllers are used for the system, with a Carrier NetLink module used for remote access and alarm relaying. Additional instrumentation has been installed for supplementary data collection and is monitored using Labview software. The power plant is monitored by both on-site Chena personnel and UTC engineers remotely. At design condition, the power plant produced 205kW net (see Figures 16 and 17 on the following page). 28PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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