A grounding transformer, also known as a grounding transformer, is a special type of transformer that is mainly used in neutral point grounding systems to provide neutral point grounding for the system. Its application in power systems is to achieve safe and reliable operation of electrical systems.
The working principle of a grounding transformer is as follows:
Neutral Grounding: In power systems, the neutral point of the power system is usually grounded for safety and fault identification purposes. This means that there is an electrical connection between the neutral point and ground so that current can flow back to ground in the event of a fault.
Neutral point connection: One side of the grounding transformer (usually the high voltage side) is connected to the neutral point of the power system, and the other side (usually the low voltage side) is connected to the ground. This connection method allows a certain voltage drop between the high-voltage side of the transformer and the neutral point, while the low-voltage side remains grounded.
Electrical isolation: A grounding transformer provides electrical isolation between the high-voltage side and the low-voltage side, preventing fault current from the high-voltage side from flowing directly to the low-voltage side. This helps protect equipment and personnel on the low voltage side.
Fault current guidance: When a single-phase ground fault occurs in the power system, the fault current will flow back to the low-voltage side of the transformer through the high-voltage side of the grounding transformer, and the fault point can be detected and located through fault indicators in the grounding system.
Grounding transformers play an important role in power systems. They can effectively reduce ground fault currents in the system and help maintain stable operation of the electrical system. In addition, it can also guide fault current when a fault occurs, helping operation and maintenance personnel quickly locate the fault and take measures to repair it.
