100% Stator Ground Fault Protection

The 889 provides 100% Stator Ground Fault Protection for High

Resistance Grounded System (HRG), Low Resistance Grounded

(LRG) or Hybrid Grounded Systems. For HRG systems the 889

employes a unique combination of Auxiliary Overvoltage and 3rd

Harmonic Neutral Undervoltage protection elements to provide

secure, reliable protection of the stator winding. With this function

the 3rd harmonic neutral voltage variations do not need to be

considered, simplifying the settings and configuration process.

For LRG systems with parallel machines, the 889 provides ground

fault coordination ensuring only the faulted generator is islanded.

In Hybrid Grounded Systems, the 889 provides fast, dynamic

switching from low-z to high-z when an internal generator fault

is detected, reducing potential damage to the generator and

eliminating the need for additional protection devices.