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