System and methods of use for conducting a neutral corrosion sur

Details System and methods of use for conducting a neutral corrosion sur System and methods of use for conducting a neutral corrosion sur

1995-03-23

1996-03-12

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324523, 324713, G01R 3102

Patent

active

054989671

ABSTRACT:
A system and method for testing underground electric cables, while in service, for active corrosion and degree of neutral loss. The method is conducted by applying a non-harmonic selected frequency signal to the neutral(s) of the underground cable connecting a pair of structures, e.g., power transformers, from a variable frequency generator of the system. The test is conducted by a surveyor wearing foot electrodes which contact the earth as the surveyor walks along the earth over the cable in a close interval steps. At each step, direct current (DC) potentials are monitored by a voltmeter between a copper-copper sulfate electrode carried by the surveyor and brought into contact with the ground at each step and the transformer ground. The potential of the gradients between the foot electrodes at the selective frequency and at the native alternating current (AC) is also measured by the voltmeter. These measurements are recorded at a stationary location on a digital data logger and/or computer. At all points of direct current or selective frequency potential abnormalities, a waveform is recorded of both potentials, as well as peak-to-peak potential measurements, maximum potential, minimum potential, mean potential, frequency, rms voltage, and soil resistivity to generate a continuous corrosion and condition profile of the entire length of cable including permanent land features.

REFERENCES:
patent: 3289076 (1966-11-01), Edis et al.
patent: 3792350 (1974-02-01), Bosslek et al.
patent: 3991363 (1976-11-01), Lathrop
patent: 4151458 (1979-04-01), Seager
patent: 4697137 (1987-09-01), Haddon et al.
patent: 4839598 (1989-06-01), Calvert et al.
patent: 4929901 (1990-05-01), Kimball et al.
patent: 4947469 (1990-08-01), Vokey et al.
patent: 5101161 (1992-04-01), Walsh et al.
patent: 5126654 (1992-06-01), Murphy et al.
patent: 5210498 (1993-05-01), Paananen
patent: 5347212 (1994-09-01), Bass et al.
patent: 5451862 (1995-09-01), Bass et al.
Maloney, Charles A.; "Locating Cable Faults"; Jul. '73 IEEE Trans. on Industry Apps.; vol. 1A-9, No. 4; pp. 380-394.

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