: Defines requirements for both analogue and digital secondary signals used for measuring, protection, and control. Safety & Environmental Requirements :
Includes updated accuracy requirements for harmonics and standards for anti-aliasing filters . iec 618691 pdf best
IEC 61869 is the international . It replaced the older IEC 60044 series. If you design, test, or maintain substation equipment, you need the correct part of IEC 61869 — not just any PDF labeled with the number. : Defines requirements for both analogue and digital