Transformer grounding resistance cabinets: my country’s power system commonly used neutral spots: neutral points are directly grounded, neutral points are not grounded, neutral points are connected to the ground (resonant ground), neutral points are electrically blocked Four ways.
Power system grounding mode involves a number of important issues such as safe operation, reliability of power supply, power supply, and electricity safety.The neutral point is attached to a resistor in series between the grid neutral point and the ground.
Suitably select the resistance of the received resistor, not only can the energy of the half wave of the single-phase extent, thereby reducing the possibility of arc re-ignition, suppressing the radiation of the power grid overvoltage, but also improves the sensitivity of the relay protection deviceEffectively protect the system normally operation in tripping.