: It introduces "S" classes (like 0.2S or 0.5S), which are high-precision versions that remain accurate even when the current drops to very low levels—essential for modern energy billing. Modern Innovations
The standard meticulously categorizes CTs based on their intended function, primarily distinguishing between and protective CTs .
A crucial aspect of the standard is its classification of CTs based on application:
Requirements for protective current transformers for transient performance.
One of the most comprehensive aspects of IEC 61869-2 is its approach to type tests and routine tests. The standard mandates a series of dielectric tests (including lightning impulse and switching impulse voltages) and temperature rise tests to verify the CT's thermal stability.
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