Grounding is the base for ensuring reliable operation of power system and personal safety. Study on grounding technology involves multiple disciplines of geology

soil

chemistry

materials

electrical engineering

and their overlap. The corresponding research covers a broad area

which not only is important for engineering application value

but also has very important theoretical significance. In this paper

the research achievements in grounding technology are summarized from the aspects of ground safety index at power frequency

numerical analysis method

measures to reduce grounding resistance

lightning impulse characteristics

testing

and evaluation. Generally speaking

the research in China has already started

has already made a deep understanding to some problems

and has already achieved fruitful results. Some technologies and ideas have been successfully used to solve practical problems. However

with the development of high-voltage

high smart and high reliable power grid

the requirements for the performance of the grounding device are becoming higher and higher

and the development of grounding technology is faced with many challenges. It is urgent to study the grounding simulation technology in complex geological conditions

the lightning impulse characteristics

the interaction between grounding device and other equipment either belonging to other facilities or power grid

the evaluation from all aspects

and grounding materials and anti-rust technology.