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ION REFERENCE 09/2008 Sliding Window Demand Module Power utilities generally bill commercial customers based on their energy consumption (in kWh) and their peak usage levels, called peak demand (in kW). Demand is a measure of average power consumption over a fixed time interval, typically 15 minutes. Peak (or maximum) demand is the highest demand level recorded over the billing period. Sliding window demand is one method of measuring demand. To compute sliding window demand values, the Sliding Window Demand module uses the sliding window averaging (or rolling interval) technique which divides the demand interval into subintervals. The demand is measured electronically based on the average load level over the most recent set of subintervals. This method offers better response time than fixed interval methods. Sliding Window Demand Module Source Enable Sync SWinDemand PredDemand Time Left Interval End Event Reset The Sliding Window Demand module calculates sliding window and predicted demand over a specified number of subintervals of a specific length. The module can be either internally or externally synchronized. For external synchronization, you would typically use the output from a Digital Input module as a Sync pulse. The module performs predicted sliding window demand by automatically predicting the value that each sliding window demand parameter will attain when updated at the start of the next interval. Schneider Electric 2195 Keating Cross Road Saanichton, BC Canada V8M 2A5 Tel: 1-250-652-7100 For technical support: [email protected] (00) + 1 250 544 3010 Contact your local Schneider Electric sales representative for assistance or go to www.powerlogic.com ION, PowerLogic and Schneider Electric are trademarks or registered trademarks of Schneider Electric in France, the USA and other countries. Other trademarks used are the property of their respective owners. Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material. © 2008 Schneider Electric. All rights reserved.
