Energy reduction: Wireless sub-metering cuts use, costs

01/16/2007


System integration/control components/wireless

Wi-LEM family of sub-metering components from LEM S.A. is said to identify performance problems in processes and systems; determine opportunities for increasing efficiency; and allocate energy costs to specific processes.

Geneva, Switzerland, and Milwaukee, WI —Wi-LEM (wireless local energy meter) family of components from LEM S.A. is designed to monitor and reduce electricity consumption. Wireless communication enables a significant reduction of time, costs, and disruption involved in deploying sub-metering installations.

Wi-LEM is said to avoid many sub-metering barriers. Its small footprint simplifies installation; the compact split-core transducer can be placed easily into the limited free space typical in existing cabinets. The wireless automated monitoring network uses the ZigBee 802.15.4 standard. It allows a high number of nodes and works on an RF range of 2.4 GHz.

Product family includes:

  • Energy meter node : An assembly of 1 to 3 current transducers with a signal process module that can be used to measure consumption at any point in the power cabinet and can transmit data;

  • Mesh node : A repeater linking various nodes that enables wireless communication throughout a large installation; and

  • Mesh gate : A gateway that manages the mesh network and provides data through a serial interface to a PC.

Energy meter nodes measure active, reactive, and apparent energy and maximum current and minimum voltage with accuracy certified to IEC 62053 Active Energy Class 1 and Reactive Energy Class 3. They are available for 120 and 240 V ac and can be configured for nominal currents from 5 to 100 A. The nodes measure at 5 to 30 min. intervals and transmit results over the 2.4 GHz ISM band.

Mesh nodes can be added to the network without need for additional configuration or programming. The gate connects the transducer network with a PC using serial interfaces RS-232 or -485 with a Modbus RTU protocol. Each gate allows monitoring of up to 240 energy meter nodes. Mesh Gate and Mesh Nodes were developed in close cooperation with Millennial Net , a developer of wireless sensor mesh network technology. LEM S.A. manufactures isolated current and voltage measurement components.

— Control Engineering Daily News Desk
Edited by Jeanine Katzel , senior editor





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