High Voltage Protection Of Hydro Sub Stations
In electrical engineering, earth potential rise (EPR) also called ground potential rise (GPR) occurs when a large current flows to earth through an earth grid impedance. The potential relative to a distant point on the Earth is highest at the point where current enters the ground, and declines with distance from the source. Ground potential rise is a concern in the design of electrical substations because the high potential may be a hazard to people or equipment.
The change of voltage over distance (potential gradient) may be so high that a person could be injured due to the voltage developed between two feet, or between the ground on which the person is standing and a metal object. Any conducting object connected to the substation earth ground, such as telephone wires, rails, fences, or metallic piping, may also be energized at the ground potential in the substation. This transferred potential is a hazard to people and equipment outside the substation.
Read more about High Voltage Protection Of Hydro Sub Stations: Causes, Step, Touch, and Mesh Potentials, Mitigation, Calculations, Standards and Regulations, High-voltage Protection of Telecommunication Circuits
Famous quotes containing the words high, protection and/or stations:
“As I walked on the glacis I heard the sound of a bagpipe from the soldiers dwellings in the rock, and was further soothed and affected by the sight of a soldiers cat walking up a cleated plank in a high loophole designed for mus-catry, as serene as Wisdom herself, and with a gracefully waving motion of her tail, as if her ways were ways of pleasantness and all her paths were peace.”
—Henry David Thoreau (18171862)
“... actresses require protection in their art from blind abuse, from savage criticism. Their work is their religion, if they are seeking the best in their art, and to abuse that faith is to rob them, to dishonor them.”
—Nance ONeil (18741965)
“I cant quite define my aversion to asking questions of strangers. From snatches of family battles which I have heard drifting up from railway stations and street corners, I gather that there are a great many men who share my dislike for it, as well as an equal number of women who ... believe it to be the solution to most of this worlds problems.”
—Robert Benchley (18891945)