Selection of system neutral grounding resistor and ground fault protection for industrial power systems

Low-voltage (LV) and medium-voltage (MV) industrial power distribution systems below 15 kV are discussed. The method chosen for system neutral grounding is significant to system performance, operation, maintenance, safety, etc. Solidly grounded (SG), low-resistance grounded (LRG), and high-resistance grounded (HRG) systems are discussed and compared. Selection of neutral grounding resistor values and ground fault protection devices are discussed. It is proposed that a modified high-resistance grounding (MHRG) with ground fault tripping may be the better practice in some industrial applications.<
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