The 35kV-500kV open-type substation is generally composed of high-voltage equipment substation, low-voltage equipment substation, main transformer, 35kV power distribution area (room), 10kV power distribution room, supporting facilities (garage, warehouse, concierge, pool, etc.), Cable trench, independent lightning rod, comprehensive building, control room (part of the substation control room and the integrated building together, called the main control building) and other components. Substation grounding is mainly divided into three parts: primary grounding, secondary grounding and lightning protection grounding (anti-static grounding is a secondary grounding part).
The primary grounding grid consists of a horizontal grounded main network (a grid consisting of horizontal grounding poles), a vertical grounding pole, and a grounding down conductor of the structural equipment. The grounding down conductor of the structural equipment is divided into two parts connected above and below ground.
The secondary grounding mainly includes the equalization of the indoor part and the grounding of the control room panel. The secondary grounding in the broad sense also includes the equalizing conductor in the cable trench, also known as the Mingshi grounding trunk, which is connected to the indoor grounding grid through the cable shaft.
The lightning protection grounding includes a lightning protection belt for the building such as the main control building, a lightning rod and a centralized grounding device for the independent lightning rod. The grounding of the lightning rod is too close to the main grounding grid. It is only necessary to lay the grounding pole close enough at the corresponding position and increase the vertical grounding pole.