Steel Plant Controls Power Demand
Steel-bar producer Republic Technologies International recovered the installed cost of a demand management system in a Canton, Ohio, facility in under 6 months and projects ongoing cost savings up to $70,000 monthly.Electric power costs of $2.7 million per month are a significant share of operating expenses.
Steel-bar producer Republic Technologies International recovered the installed cost of a demand management system in a Canton, Ohio, facility in under 6 months and projects ongoing cost savings up to $70,000 monthly.
Electric power costs of $2.7 million per month are a significant share of operating expenses. The contract with its electric power provider includes a demand limit, above which the price of power significantly rises. A curtailment clause gives the utility the option to mandate immediate reduction of load to base levels.
The solution was to inhibit or shed electric furnace loads to control power demand. The specified system totals electric meter pulses and projects demand within the 30-minute fixed-demand interval. Furnace operators select priorities to determine the system's actions based on the demand forecast.
The new system utilizes a redundant pair of processors with backup communications modules tied into the existing control Ethernet. Remote I/O panels at the three furnaces use a redundant fiber-optic loop to communicate with the processors. In addition, a new power monitoring system on the plant mains provides additional power-quality data.
For more information on power monitoring and control systems from Rockwell Automation, circle 453 on the Reader Service Card.
From Pure Power, Spring 2001
|Search the online Automation Integrator Guide|
Case Study Database
Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.
These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.
Click here to visit the Case Study Database and upload your case study.