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Grounding wire in power systems: It is an important tool to ensure workers in case of unexpected voltage on outage equipment and lines.

Protection of electrical appliances:
The grounding wire can effectively prevent electrical appliances from being damaged by excessive charge caused by electrostatic discharge. 

Lightning protection:
The grounding wire helps to reduce the damage caused by lightning strikes on electrical appliances and ensure the safety of electrical appliances in the event of lightning strikes.
Ensure proper operation of the machine:
Many electrical appliances require continuous power supply to function properly, such as medical equipment. The ground wire can maintain a small load of power to these devices in the event of a power outage to avoid data loss or other effects.
Protect human safety:
In the event of an electric shock, the grounding wire can direct the current to the ground, significantly reducing the current flowing through the human body, thereby saving lives. 

In addition, the grounding wire also helps to provide a relatively safe operating environment for workers in the event of a power system outage, because even if voltage is present, the grounding wire can quickly transfer it to the ground.