IEC 61869-2 was written between 2012 and 2017, but its true impact is only felt now, in the age of IEC 61850 (the standard for digital substation communication).
IEC 61869-2 has no brand, no logo, no fanfare. But every time a wind turbine connects without destabilizing the grid, every time a fault is cleared in 50 ms instead of 500 ms, every time a protection relay sees a transient and doesn't trip unnecessarily—that is the standard's silent work. iec 61869 2
Let us go to a factory in Shenyang, where a TPX class CT is being type-tested. A test engineer, call her Mei, applies a 20 kA primary current with a 70% DC offset—a "worst-case" per 61869-2. IEC 61869-2 was written between 2012 and 2017,