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.
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