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Portable grounding cables are also called three-phase short-circuit grounding cables because three-phase short-circuiting is not grounded or three phases are individually grounded. In the event of a three-phase short-circuit non-grounding, if a "single-phase power ingress" occurs, such as a phase live conductor accidentally contacts the conductive portion of the power outage device. Or because of the induced voltage generated by the electromagnetic induction near the live equipment or parallel lines, because there is no grounding protection, this voltage (refers to the earth) is the contact voltage that the staff bears, and it will obviously cause serious electric shock accidents.
If three-phase earthing is adopted separately, in the neutral point non-directly earthed system, when the "single-phase power supply invades", the protection action does not act and the power supply is not cut off, causing the operator to suffer dangerous voltage and arc generated by accidental incoming calls.
It can be seen that the use of a three-phase short-circuit grounding wire for a portable grounding cable is the most effective measure to protect workers from harm. Maintenance personnel in the production practice summed up the following safety jingle: Before the maintenance of the ground line, there is a ground wire to dry, no ground wire to the right.
[Fanyu Electric] Why is a portable ground wire also called a three-phase short-circuit ground wire?
Why is a portable ground wire also called a three-phase short-circuit ground wire?