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Neutral Grounding Resistor

Neutral grounding resistor is a current-limiting electrical protection device connected between the neutral points of generators and transformers and the ground. When the electrical network line fails, the neutral point voltage of the power supply will shift. Especially in the electrical network system powered by cables, the capacitance current to the ground is large. When the current is greater than the specified value, it will cause arc grounding overvoltage, which will greatly increase the ground voltage of the non-faulty phase, make equipment insulation damaged, and power outage due to two-point or multi-point short-circuit to ground. The neutral grounding resistor can inject resistive current into the fault point, make the ground fault current resistive and capacitive, and reduce the phase difference with the voltage and the re-ignition rate after the fault point current reaches zero and arc extinguished, so that the overvoltage is limited to a certain level, and the sensitivity of the relay protection equipment is improved to achieve tripping, rapid searching for fault lines and backup switching, thereby effectively protecting the operation of the system.