Technology Literature

What is the neutral point grounding of the power system?

Commonly used neutral point grounding methods for power systems are: direct neutral grounding, neutral grounding, neutral grounding via arc suppression coil (resonant grounding), and neutral grounding via resistance grounding. The grounding operation mode of the power system involves many important aspects such as the safe operation of the power grid, the reliability of power supply, and the safety of the user. In the professional and technical aspects related to power systems, overvoltage and insulation coordination, relay protection, communication and automation, electromagnetic compatibility, grounding design and many other fields, is a wide-ranging system problem.


Among them, the neutral point is connected to a resistor in series between the neutral point of the power grid and the ground. Appropriate selection of the resistance of the connected resistor not only bleeds off the energy of the half-wave after the single-phase grounding arc, thereby reducing the possibility of re-ignition of the arc, suppressing the amplitude of the over-voltage of the grid, and improving the sensitivity of the relay protection device. In order to act on the trip, effectively protecting the normal operation of the system.


In the AC grid, especially in cable-powered networks, resistance grounding is increasingly widespread.


Transformer neutral point grounding resistance cabinet is a complete set of grounding equipment including grounding transformer. It can be installed in power plant power system, substation power supply system, industrial and mining enterprise power distribution system, and realize the neutral point resistance of these power grids. Grounded system operation mode.