Iec 61869-2 Current Transformers Jun 2026

These are designed to be highly accurate at normal load currents but saturate quickly to protect sensitive meters during a fault.

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. iec 61869-2 current transformers

For protective CTs, the ability to accurately reproduce the primary current during a fault—which often includes a decaying DC component—is vital. IEC 61869-2 details the requirements for TP (Transient Protection) classes (TPX, TPY, TPZ). These classes dictate how the transformer core behaves under the magnetic saturation caused by the asymmetrical fault current, ensuring relays do not maloperate. These are designed to be highly accurate at