Grounding -- what is the difference between PLC grounding and high-voltage grounding?
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This post was last edited by oatobnus on 2011-6-30 at 14:55. Dear experts: What is the difference between the grounding of a PLC and that of high-voltage systems? What does absolute grounding mean? Why is absolute grounding necessary?
Reply 1# lihuabook05: The PLC grounding belongs to the signal ground within instrument grounding, while the high-voltage grounding belongs to the protection ground in electrical grounding. Both are ultimately connected to the grounding grid
Grounding is generally divided into working ground, protective ground, and electrical ground, but all of these ultimately connect to the electrical grounding network. What’s a bit unclear to me is how the cable shielding layer should be grounded in order to meet the standards; it is generally said that the cable shielding ground should be connected at a single point (that is, either indoors or on-site, with indoor grounding being the common practice)
What was said on the 3rd floor is correct; the grounding is ultimately connected to the electrical ground. In the field of instrumentation, in order to reduce interference, it is generally required to use single-point grounding rather than multiple grounding points. In other words, the shielding terminals at the site are not connected to the instruments there, but are grounded collectively in the control room.