Friday 6 November 2015

Difference between CT class 0.2 and 0.2S?

Difference between CT class 0.2 and 0.2S?
§  0.2S & 0.5S: Special type of measurement CTs they guarantee the declared accuracy, even with
20% loading. And some definite error can be defined even with a load as low as 1%. Thus they are suitable for industries where loads are commissioned in steps or stages. Also for tariff metering purposes.
§  0.2S: Special class for metering. It is more accurate than 0.2 classes. Generally if we use 0.2s class CT than VA burden of core is also come down.
§  In 0.2 classes CT, ratio & phase angle errors must be within the specified limits at 5%, 20%, 100% & 120% of rated secondary current. Whereas in 0.2s class CT, ratio & phase angle errors must be within the specified limits at 1%, 5%, 20%, 100% & 120% of rated secondary current. Also in 0.2s class, Ratio & Phase angle errors limits are lower than 0.2 classes.


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