What are the levels of current transformers

The accurate level of the current transformer is the measurement error (zhi accuracy) dao of du, generally 0.2, inner 0.5, 1.0, 0.2S, 0.5S, 5P, 10P, etc. S is a special capacitor current transformer, which requires high enough accuracy within the load range of 1%-120%. Generally, the error of measuring at 5 load points is less than the specified range; 0.2, 0.5, etc. are generally measuring coils, and the error is 20 The accuracy is high enough in the load range of %-120%. Generally, 4 load points are used to measure the error less than the specified range (errors include ratio difference and angle difference, because the current is a vector, so the magnitude and phase angle difference are required), and 5P, 10P current transformers are generally used for relay protection, that is, the composite error is required to be less than a certain value under short-circuit current, 5P is less than 5%, and 10P is less than 10%; therefore, current transformers have different accuracy according to the application. , That is, the error accuracy in different current ranges.

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Post time: Oct-29-2020