Meter Advice help

[nachiketsakinal]

Can anyone tell me the description of Accuracy class 1 & 2 in electricity meter..

 

[RODALCO]

The accuracy class for electricity meters is + or - 1% maximum metering error within it's specifications for Class 1.
Often the meters are a lot more accurate than that.

Same applies for class 2 meters

 

[nachiketsakinal]

Oh..Thanks a lot...But all electricity meters are only class 1 or less than that also means class 0.5 or class 0.2..?

 

[RODALCO]

Class 0.5 and class 0.2 are more accurate meters. These are often found on large customers or grid exit metering points.
Of course they are more expensive too.
Often the suffix S is added. e.g. class 0.5 S.

 

[nachiketsakinal]

Thnx. What is meaning of that suffix 'S'..?
And for measuring... as class 0.2 accuracy , can we get the CT & PT as that high accuracy or more than that accuracy..? or some other circuit is there for current & voltage sensing...?
If yes, can you suggest any link for that or vendor of that CT / PT..?

 

[RODALCO]

No idea, I think the (S) accuracy is over a limited range. e.g. a 5 Amp meter will be within its class specs at currents between 10 and 100% of the nominal current. ( 0.5 to 5 Amps )
Many class 1 and class 2 CT 5 Amp meters are accurate for currents up to 10 Amps.
Single tap CT's are more accurate than multitap CT's. class 0.2 CT's exist but are expensive, same applies to VT (PT's)