Why should the safety sign be hung when the substation is out of power?

Prevent others from shutting it down without knowing it. Technical measures for safe work: power failure, electricity inspection, grounding wire hanging, signboard hanging and fence installation.

Substation, where the voltage changes. In order to transport electric energy from power plants to distant places, it is necessary to increase the voltage and convert it into high-voltage electricity, and then reduce the voltage near users as needed. The work of raising and lowering the voltage depends on the substation. The main equipment of substation is switch and transformer. According to different scales, small ones are called substations. Substation is bigger than substation. Substation: generally, it is a step-down substation with the voltage level below 1 10KV; Substation: including "step-up and step-down" substations with various voltage levels.