The grounding operation mode of power system can involve many important problems, such as the safe operation of power grid, the reliability of power supply, the safety of users' power consumption and so on. In terms of professional technology, it involves many fields, such as power system, overvoltage and insulation coordination, relay protection, communication and automatic control, electromagnetic compatibility, grounding design and so on.
Among them, the neutral point through the grounding resistance cabinet is connected to a resistance cabinet in series between the neutral point and the ground. Proper selection of the resistance value of the connected resistance cabinet can not only release the energy of the second half wave of the single-phase grounding arc, fundamentally reduce the possibility of arc re ignition, inhibit the radiation value of the grid overvoltage, but also improve the sensitivity of the relay protection device to act on tripping, so as to effectively protect the normal operation of the system.
In AC network, especially in the network supplied by cable, grounding resistance cabinet is widely used. Transformer neutral point grounding resistance cabinet is a complete set of grounding equipment including grounding transformer, which can be installed in auxiliary power system of power plant, power supply system of substation and power distribution system of industrial and mining enterprises to realize the system operation mode of neutral point through grounding resistance cabinet in these power grids.