One of the most critical aspects of IEC 61869-2 is the definition of accuracy classes. These define how precisely the transformer reproduces the primary current on the secondary side.
: Covering standard measuring and protective CTs. norma iec 61869-2
The standard applies to newly manufactured inductive current transformers with rated frequencies between . It is intended for use in conjunction with IEC 61869-1 , which contains the general requirements for all instrument transformers. 2. Historical Evolution: Replacing IEC 60044 One of the most critical aspects of IEC