earth current

[′ərth ‚kə·rənt]

(electricity)

Return, fault, leakage, or stray current passing through the earth from electrical equipment. Also known as ground current.

(geophysics)

A current flowing through the ground and due to natural causes, such as the earth's magnetic field or auroral activity. Also known as telluric current.

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Other system components should be examined, such as filters for potential blockages, switch failure and earth current loops.

Tritium testing: a good practice guide has been written by a working group of the Airborne Radioactivity Monitoring Users Group, under the auspices of NPL Andy Pye reviews the guide provides recommended procedures for examining, testing and calibrating tritium-in-air monitoring instruments for radiation protection

The laboratory test was performed using programmable power supply generating distorted earth current. In the first part of the test, current comprised the fundamental (50 Hz) and one harmonic was generated.

Comparison of residual current devices tripping characteristics for selected residual current waveforms/Sroves nuotekio reles charakteristiku palyginimas su pasirinktomis nuotekio sroves signalo formomis

Ceddes, noticed in the case of a number of aurorae that the earth currents which accompanied the displays and seriously interfered with telephonic and telegraphic communication frequently began on the afternoon preceding the auroral display.

75, 50 & 25 years ago

Faults are electromagnetic hot zones where electrical currents from the atmosphere are interacting with the subsurface currents called telluric or Earth currents. All of this is detrimental for pipelines and storage facilities, as well, and lightning is a new key to understanding how to identify what areas need to have additional cathodic protection.

The strike locations appear to be controlled more by geologically driven Earth currents than by topography, or by vegetation, or by infrastructure," he said.

Earth currents also occur in shallower stratigraphic layers from 5,000-30,000-foot depths.

Earth currents appear to be the strongest determinant as to the physical location of c2g strikes.

The researchers at DML propose it's because the Earth currents are eating away at pipelines and speeding up corrosion.

Lightning, a new key for pipeline protection

Also included are several appendices on: vector analysis-definitions and formulas, Bessel functions, parallel-slab equivalent of a slotted coaxial line, earth currents and distributed impedances, low temperature impedance effects, and a table of physical constants.