Comparison between Electronic Meters & Electromechanical Energy meters

[poject]

Hi all,

I am new in this board,

Could someone please advise me on a comparison between the electronic meters & the electromechanical Energy Meters.

I am told by my colleagues about possible accuracy drift of the electromechanical meters, where can I find more details into this?

Regards

 

[ahung]

Hi poject, I´m new too in this board. According with my experience actually the trending is use electronic meters instead electromechanical meters, because they more reliable and more accuracy in the measurements. Of course you need to install too CT and PT with the same criteria

 

[wfowfo]

Electronic meters are much more accurate and less prone to drift. However, when they do fail, the failure tends to be much more dramatic.

For instance, an element goes out in an electromechanical meter. The other two elements are still good, so it's fairly easy to estimate usage.

Some electronic meters are "powered" by one particular phase, and if they lose it (say, a fuse blows), the entire meter goes dead. (Some have the option to automatically power up off other phases...it depends on the brand). Our experience with electronic meters is, when they fail, they tend to fail all the way.
Also, the mechanical will always have the last reading available. When the digital register fails, sometimes you can get it out of memory, sometimes you can't.

The mechanical will outlast the electronic one as well.

On the plus side, there is so much more data available from the electronic meters (load profiling, TOU, min-max data, peak volts, amps, vars, watts, kva, outage counts, tamper detection, load control, etc.) that it's worth it.

 

[wfowfo]

I forgot. The electronic ones are able to combine several meter forms into one. Combine this with free-ranging voltage (120 to 480) and it let's you cut down on inventory.