—This paper is based on modifications implemented in the protection and grounding systems of a large paper mill and describes selective ground fault protection for a 13.8-kV system with multiplebus-connected generators,synchronousbusties,and utility interconnections. The ground fault current in the system is reduced from theexisting 3400A to 500A,andahybrid grounding system is implemented for each of the generators. As the ground faultcurrentsarereducedtolimitthefaultdamage,thesensitivity and selectivity of the ground fault protection become important. Directional ground fault relays with coordinating pickup settings are applied to achieve this objective. The new platform for di- rectional elements (numerical relays) drives its performance from sequence impedance measurements.