SU1691779A1 - Device for earth resistivity measurement - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used to measure the flow resistance of underground pipelines, the resistivity of the soil and the length of the deep anode earthing. The purpose of the invention is to expand the functionality by measuring the length of the deep anode earthing. Achieved by introducing into the device a differential amplifier 7, a converter of 9 pulses into voltage, a magnetic meter 10 for the length of the interelectrode distance, amplifiers 11.1, 11.2 with variable gain factors and the formation of new functional connections. The device also contains a measuring current generator 1, anode depth earthing switch 2, current electrode 3, potential electrodes 4 and 5, dividing unit 8, indicator 12. 1 Il.

Description

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The invention relates to electrical measuring equipment, in particular for measuring the resistance of the flow of underground pipelines, the specific resistance of the soil and the length of the deep anode earthing.

The purpose of the invention is to expand the functionality by measuring the length of the deep anode substrate.

The drawing shows a diagram of the proposed device.

The device consists of a measuring current generator 1, a deep anode earthing 2, a current electrode 3, potential electrodes 4 and 5, differential amplifiers 6, 7 into which detectors are inserted, a dividing unit 8, a converter 9 pulses into voltage, a magnetic meter of length 10 interelectrode distances, amplifiers 11.1-11.2 with variable gain factors, indicator 12.

The measuring current generator 1 is connected by the first output to the deep anode earthing 2, and the second to the current electrode 3, the anode deep earthing 2 is also connected to the first input of the differential amplifier 6, the potential electrode 4 is connected to the first input of the differential amplifier 7, and the potential electrode 5 is connected with the second inputs of the differential amplifiers 6, 7, the outputs of the detectors of which (entered into the differential amplifiers 6 and 7) are connected to the first and second inputs of the division unit 8, to the third input of the division unit 8 voltage is applied from the converter 9 pulses to voltage, the signal to which is supplied from the magnetic meter 10, the length of the interelectrode distance, you /

oh h

4 J Yu

the course of the dividing unit 8 through amplifiers 11.1-11.2 is connected to the indicator 12.

The device works as follows.

When the measuring current generator 1 is turned on, the alternating current at a low frequency fOTbi flows through the generator circuit 1 - anode depth earthing switch 2 between the current electrode 3 and the depth anode earthing switch 2 installed at the distance Z, where a is the distance between the electrodes.

The voltage drop in the area between the grounding 2 and the electrode 3 is controlled by potential electrodes 4 and 5, located on the same line through the distance a. The distance selected between the grounding 2 and the current electrode is determined by the number of pulses that are input to the voltage converter 9 from the wire unwound from the magnetic meter of length 10. The distance established between the current electrode 3 and the grounding 2 is divided by three different parts, at the boundaries of which potential electrodes 4 and 5 are installed. The voltage between potential electrode 5 and the deep anode earthing switch 2 is fed to amplifier 6 with a detector. Simultaneously from the potential electrodes 4 and 5, the voltage goes to the second amplifier 7c by the detector. The rectified and amplified signals with the level Ui and 1) 2 are fed to the input of the dividing unit 8, the third input of which is entered from the output of the converter 9 pulses into the voltage is the data on the distance between the electrodes -. The division unit 8 simultaneously solves two functions: the function of measuring the resistivity of the soil at the first output

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and the function of determining the deep anode earthing on the second output

1b i

(M);

a-gt (Ohm.m);

The limit in the measurement of the resistivity of the soil is determined by setting the gain of the first amplifier 11.1 and changing the gain of the second amplifier 11.2, the correction factor is introduced when measuring the length of the deep anode earthing depending on its diameter.

Claims (1)

Invention Formula A device for measuring the resistivity of the soil, containing a measuring current generator, a first differential amplifier, a dividing unit, an indicator, a grounding conductor, a current and two potential electrodes, the first output of the measuring current generator connected to the grounding conductor and the second to a current electrode. the amplifier is connected to a second electrode with a first potential electrode, characterized in that, in order to extend the functionality by measuring the length of the deep anode earthing, into it additionally, a second differential amplifier, a pulse-to-voltage converter, a magnetic interelectrode length meter and amplifiers with variable gain factors are introduced, using the first potential electrode to the first input of the second differential amplifier, and the second potential electrode to the second input of the second differential amplifier, detectors are introduced into the first and second differential amplifiers, the outputs of which are connected to the first and second inputs of the unit, respectively and dividing, and the third input block the division is connected to the output of the pulse converter in the voltage, and its input is connected to the output of the magnetic meter of the interelectrode distance, the outputs of the division unit are connected to the indicator through appropriate amplifiers with variable gain factors. "J