Wi-LEM

 

 

• What is Wi-LEM?
• What does Wi-LEM measure?
• What are the components of Wi-LEM?
• How and where can Wi-LEM be installed?
• How accurate is Wi-LEM?
• Is it possible to know if a customer disconnects the split core CT to reduce its energy bill?
• With Wi-LEM, is it possible to make a self-configuration of the EMNs?
• Is it possible to get information on the RF network itself?
• Is it possible to easily add a new EMN in an existing network?

 

 

 

 

What is Wi-LEM?

 

Wi-LEM ( Wireless Local Energy Meter) is a set of components for wireless submetering that allows electricity consumption to be monitored and reduced. By using wireless communication Wi-LEM reduces the time, cost and disruption involved in deploying the installation.

 

 

 

What does Wi-LEM measure?

 

Wi-LEM measures the active, reactive and apparent energy plus the maximum current and minimum voltage. It is ideal for Energy-Audits as it can allocate the consumption and help to define areas to reduce.

 

 

 

 

What are the components of Wi-LEM?

 

Wi-LEM consists of:

• Energy Meter Nodes: an assembly of 1-3 current transducers with a signal processing module. They can be deployed to measure energy consumption anywhere in the cabinet transmit the data.
• Mesh Node is a repeater linking the various Nodes. It enables the wireless communications throughout a large installation.
• Mesh Gate is a gateway managing the mesh network. It provides data through serial interference to a PC.

 

 

How and where can Wi-LEM be installed?

 

Because of the compact size Wi-LEM can be easily installed inside the free space of existing cabinets – right where the energy is consumed. The spilt core current transducers simplify the process as there is not need to disconnect.

 

 

 

How accurate is Wi-LEM?

 

Wi-LEM is certified to IEC 62053 Active Energy Class 1 and Reactive Energy Class 3. The overall precision is above 99%.

 

 

Is it possible to know if a customer disconnects the split core CT to reduce its energy bill?

 

Usually with traditional energy meter you can not see it. However, the EMN measure the current on each phase which will tell immediately if the CT is disconnected and when. So, at the software level an alarm can be set up when this event happen.

 

 

With Wi-LEM, is it possible to make a self-configuration of the EMNs?

 

Yes, because when the RF network is established the Mesh Gate has a specific register with all the ID of connected EMNs. Therefore, it is possible to individually ask them to get their current rating and attribute automatically their scaling factors.

 

 

Is it possible to get information on the RF network itself?

 

Yes, the Mesh Gate has several registers allowing the visualization of the RF network. For example it is possible to display the RF link strength between an EMN and a Mesh Node or to see the data path from the EMN to the Mesh Gate. These features are ideal to make the network installation and maintenance.

 

 

Is it possible to easily add a new EMN in an existing network?

 

Yes, as each EMN has a unique ID it is very simple to extend the network. Indeed, when the new EMN will be switch on the Mesh Gate will recognized it immediately. Through a software procedure, the scaling factors will be automatically attributed and the data will arrive.