 HomeNewsA text to understand the difference between the current transformer accuracy 0.2 and 0.2S and the structure of the current transformer

A text to understand the difference between the current transformer accuracy 0.2 and 0.2S and the structure of the current transformer

2022-04-27

The rated secondary current of the Current Transformer shall be determined to ensure that the actual load in normal operation reaches about 60%of the rated value,at least not less than 30%.When the actual load current is less than 30%,a multi-ratio current transformer with a tapped secondary winding or a 0.5S,0.2S class current transformer should be used.

Current transformers with S-class such as 0.2S and 0.5S are mainly used for connection with special watt-hour meters.These watt-hour meters are between 0.05-6A and 1%-120%of rated current 5A.Accurate metering under current.

Both 0.2S and 0.2 are CTs of the same precision.However,the S-class can achieve the accuracy requirement in the light load("10%"),and the CT without the S-class can reach the accuracy requirement when the load reaches 30%!In particular,the 0.2S class is mainly used in applications where the load variation range is relatively large,and sometimes it is almost empty.In other words,a 0.2-level current transformer can achieve an accuracy level of 0.2 when the current in the circuit reaches 10%of the rated current,and a wide-range 0.2S-level current transformer when the current in the circuit reaches 1%or more.Can achieve an accuracy level of 0.2.

The definition of S grade:0.2S grade can not exceed plus or minus 0.75%at 1%rated current,and the current error of 0.2 grade at 5%rated current cannot exceed plus or minus 0.75%.

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 HomeNewsA text to understand the difference between the current transformer accuracy 0.2 and 0.2S and the structure of the current transformer

Anyang Kayo Amorphous Technology Co.,Ltd.

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Name: Ms. Lina zhao

Email: nana1@kayo-tech.cn

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