During the operation of the equipment, single-phase grounding is the most common fault. When arc grounding occurs at the fault point, the insulation damage of the stator winding will be further expanded and even the iron core will be burned and sintered. If it is not discovered and removed quickly in time, the fault will develop into a phase-to-phase or turn-to-turn short circuit.

Based on the above reasons, the neutral point resistance grounding of generators is widely used internationally to limit the grounding current and prevent various overvoltage hazards, and good operating experience has been achieved.

The neutral point resistance grounding method began to be used in China’s power distribution network system in the 1990s. It is currently widely used in China's urban power supply system, power plants, railways, metallurgy and petrochemical systems, and has a good effect on improving the reliability and safety of system operation.

Sunwin as the manufacturer that developed and produced neutral point resistance devices for power systems earlier in China. The generator neutral point grounding resistor complete set can fully meet the requirements of the power neutral point for equipment in terms of thermal and electrical performance. It has high temperature tolerance, high resistivity, small resistance temperature coefficient, high tensile strength, good toughness and other excellent mechanical properties. It is a special complete set for 0.4kV-65kV equipment.