What is the Difference Between "Metering CT" and "Simple CT"

Also see

http://cr4.globalspec.com/thread/43440

http://community.myelectrical.com/wikis/myelectricalwiki/ct-dimensioning.aspx

http://cr4.globalspec.com/thread/51403

- MS

Hi

A metering CT will be of higher accuracy class may be of <0.5% or better typically 0.2% (most common for this purpose).

A general CT can be of >1% accuracy, may be ok for protection circuits or for indication of current in the monitoring panel, not for accurate measurement purposes.

thanks for useful answers.

very generally saying:

metering cts have better accuracy at rated current and below and saturate quickly and can be set to saturate say at 200%.thus protecting sensitive meters under fault conditions.protection cts generally have comparitively inferior accuracy at rated current but can be set to reproduce currents as high as 20-50 times or even more with about 5-10% accuracy.

metering ct function is important when there is no fault but protection ct performance is important under fault conditions.