GINO grounding resistors. In medium voltage grids with low-resistance neutral grounding, grounding resistors restrict any ground fault current to a maximum admissible value until the corresponding protective relays have switched off the defective circuit. In compensated grids where the neutral points are grounded via inductivities, they serve to localize any existing ground fault by briefly connecting the neutral point of the transformer to a resistor to increase the effective component of the fault current. Grounding resistors are typical resistors for short-term applications. Their main feature is their energy storing capacity. Therefore, cast iron resistors are often selected for such applications.

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