What are the characteristics of the grounding of the power system and equipment?
Security grounding - is to protect the safety of the people and set the grounding point, such as: electrical equipment shell grounding, voltage transformer grounding two times, etc..
The grounding - is the need for work and set up the ground, such as: high current transformer neutral point grounding, primary voltage transformer neutral grounding, 380/220V three-phase four wire neutral grounding, etc..
According to the use and nature of grounding, it can be divided into "working grounding" and "security grounding".
