Apparatus for the continuous monitoring of ground bed resistance

Details Apparatus for the continuous monitoring of ground bed resistance Apparatus for the continuous monitoring of ground bed resistance

1978-03-08

1980-06-24

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 64, 324 65R, 361 42, G01R 2702

Patent

active

042097410

ABSTRACT:
A system for measuring the resistance of an earth electrode such as a coal mine safety ground bed. Current is circulated between the bed and an auxiliary current probe installed approximately ten times the maximum linear dimension of the ground bed under test. By measuring the voltage level between the ground bed and an auxiliary voltage probe placed about 62 percent of the distance from the ground bed to the auxiliary current electrode along the straight line between them, the true resistance of the ground bed can be determined. To sense the current value of the current flowing into the ground bed, a current transformer is placed around the lead to the ground bed. Voltage measurements are made with a high impedance voltage amplifier connected between the ground bed and the auxiliary voltage probe. Continuous monitoring of the measurements obtained without the presence of operator is achieved by using an analog divider and filter with their output terminal being connected to a recorder.

REFERENCES:
patent: 1719786 (1929-07-01), Schlumberger
patent: 1887915 (1932-11-01), Borden
patent: 2122549 (1938-07-01), Borden
patent: 2260234 (1941-10-01), Rolfe
patent: 2375022 (1945-05-01), Morris et al.
patent: 3319158 (1967-05-01), McDoulett et al.
patent: 3754221 (1973-08-01), Stelter
patent: 3913010 (1975-10-01), Scarpino
patent: 3934176 (1976-01-01), Vasudevan et al.

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