!!top!! — 61869-2

In short, IEC 61869-2 isn't a page-turner. But if you want your voltage measurements to survive a nearby lightning strike, a harmonic storm from a solar farm, and a digital relay's relentless sampling—this is the document that makes it possible. Respect the VT. Read the standard.

The standard harmonized how magnetization curves are recorded, reducing confusion between peak and RMS values during testing. 61869-2

The standard categorizes current transformers into two main functional groups: and Protective CTs . Measuring Current Transformers In short, IEC 61869-2 isn't a page-turner

The number before 'P' is the percentage error, and the number after is the Accuracy Limit Factor (ALF) . For example, a 5P20 CT has less than 5% error at 20 times its rated current. Read the standard

The standard applies to newly manufactured CTs with rated frequencies between . It works alongside IEC 61869-1 , which covers general requirements for all instrument transformers.