CN218629989U - Circuit and device for measuring two-terminal grounding resistance by using natural field - Google Patents
Circuit and device for measuring two-terminal grounding resistance by using natural field Download PDFInfo
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- CN218629989U CN218629989U CN202221455627.2U CN202221455627U CN218629989U CN 218629989 U CN218629989 U CN 218629989U CN 202221455627 U CN202221455627 U CN 202221455627U CN 218629989 U CN218629989 U CN 218629989U
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Abstract
The utility model discloses an utilize natural field to measure bi-terminal ground resistance circuit and device, utilize natural field bi-terminal to measure ground resistance circuit and include first electrode, the second electrode, first impedance circuit, second impedance circuit, the selection switch circuit, signal processing circuit and control circuit, the first end and the second electrode of first impedance circuit are connected, the first end and the second electrode of second impedance circuit are connected, the first link and the first electrode of selection switch circuit are connected, the second link of selection switch circuit is optional to be connected with the second end of first impedance circuit and constitutes first switch-on route or constitutes the second switch-on route with the second end connection of second impedance circuit. The method solves at least one technical problem that the measurement of the grounding resistance is inaccurate easily caused by a natural field, and the mutual interference of the simultaneous test of a plurality of detection channels is required in the measurement of the grounding resistance.
Description
Technical Field
The utility model relates to a ground resistance measures technical field, in particular to utilize natural field to measure bi-terminal ground resistance circuit and device.
Background
In geophysical exploration, signal pickup is required through electrodes to the ground, the arrangement of the electrodes is usually carried out in a way that a constructor beats into the shallow surface of the ground through a hammer or is buried in a pit on the shallow surface of the ground, and different ground surface conditions and construction modes can cause different ground resistances of the electrodes and the ground. At present, field operators mainly complete the measurement of grounding resistance through a multimeter to judge whether a circuit is open or not and whether the grounding resistance is proper or not. In the measurement process, the universal meter usually causes inaccurate measurement and even large deviation of the ground resistance due to interference of a natural field.
SUMMERY OF THE UTILITY MODEL
The utility model provides an utilize natural field to measure bi-terminal ground resistance circuit, aim at solve the natural field and lead to ground resistance to measure easily and need power supply and a plurality of detection channel to test at least one technical problem in the interference of each other in inaccurate, ground resistance measurement.
In order to achieve the above object, the utility model provides an utilize natural field to measure bi-terminal ground resistance circuit, a serial communication port, utilize natural field to measure bi-terminal ground resistance circuit includes:
a first electrode for grounding;
the second electrode is used for grounding and is arranged at a preset distance from the first electrode;
a first impedance circuit, a first end of which is connected to the second electrode and configured to output a first electrical signal according to a stray current between the first electrode and the second electrode;
a second impedance circuit having a different impedance value from the first impedance circuit, a first end of the second impedance circuit being connected to the second electrode and configured to output a second electrical signal according to a stray current between the first electrode and the second electrode;
the selection switch circuit is provided with a controlled end, a first connecting end and a second connecting end, the first connecting end of the selection switch circuit is connected with the first electrode, and the second connecting end of the selection switch circuit can be selectively connected with the second end of the first impedance circuit to form a first conduction path or connected with the second end of the second impedance circuit to form a second conduction path;
a first input end of the signal processing circuit is connected with a first end of the first impedance circuit and a first end of the second impedance circuit respectively, and a second input end of the signal processing circuit is connected with a second connecting end of the selection switch circuit and is used for processing the first electric signal and the second electric signal;
the sampling end of the control circuit is connected with the output end of the signal processing circuit, the control signal output end of the control circuit is connected with the controlled end of the selection switch circuit and used for acquiring the electric signal output by the signal processing circuit, storing the electric signal as a first sampling voltage value when the electric signal is greater than a preset voltage, and controlling the selection switch circuit to be switched to another conduction path to acquire a second sampling voltage value;
the control circuit is further configured to determine a resistance value between the first electrode and the second electrode according to the first sampling voltage value and the second sampling voltage value.
Optionally, the signal processing circuit includes a signal programmable amplifying circuit, a signal absolute value detecting circuit, a signal programmable integrating circuit, and an analog-to-digital conversion circuit, which are connected in sequence, and the analog-to-digital conversion circuit is connected to the control circuit.
Optionally, the first impedance circuit includes a first resistor, a first end of the first resistor is a first end of the first impedance circuit, and a second end of the first resistor is a second end of the first impedance circuit.
Optionally, the second impedance circuit comprises a second resistor, a first end of the second resistor is a first end of the second impedance circuit, and a second end of the second resistor is a second end of the second impedance circuit.
Optionally, the selection switch circuit includes a program-controlled switch, a first end of the program-controlled switch is a first connection end of the selection switch circuit, a second end of the program-controlled switch is a second connection end of the selection switch circuit, and a controlled end of the program-controlled switch is a controlled end of the selection switch circuit.
Optionally, the circuit for measuring two-terminal ground resistance by using a natural field further comprises a human-computer interaction circuit, and the human-computer interaction circuit is connected with the control circuit.
In order to achieve the above object, the present invention further provides an apparatus for measuring two-terminal ground resistance using a natural field, wherein the electronic device includes the circuit for measuring two-terminal ground resistance using a natural field as described above.
The utility model discloses a first impedance circuit and second impedance circuit detect out first signal of electricity and second signal of electricity respectively, thereby it detects as the current source to use the wandering current of earth to detect, and first impedance circuit's impedance value with the impedance value of second impedance circuit is different, thereby can insert the wandering current of earth as the current source respectively with first impedance circuit and second impedance and detect and obtain two different sample values, be first sample voltage value and second sample value respectively, can obtain the earth resistance value according to first sample voltage value and second sample value, because this moment use the wandering current of earth as the current source, thereby the influence of wandering current to the testing result has been got rid of, thereby it leads to the ground resistance measurement inaccurate easily to have solved the natural field, need power supply and a plurality of detection channel in the ground resistance measurement at least one technical problem in the mutual interference of simultaneous testing.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples;
FIG. 1 is a block diagram of a circuit for measuring two-terminal ground resistance using a natural field in one embodiment.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
The method aims to solve the technical problems that the measurement of the grounding resistance is inaccurate easily caused by a natural field, and at least one of mutual interference of power supply and simultaneous testing of a plurality of detection channels is required in the measurement of the grounding resistance. The utility model provides an utilize natural field to measure bi-terminal ground resistance circuit and electron device.
In one embodiment, as shown in fig. 1, a circuit for measuring two-terminal ground resistance by using a natural field is characterized in that the circuit for measuring two-terminal ground resistance by using a natural field comprises a first electrode 1, a second electrode 2, a first impedance circuit 10, a second impedance circuit 20, a selection switch circuit 30, a signal processing circuit 40 and a control circuit 50, wherein the first electrode 1 is grounded; the second electrode 2 is grounded and is arranged at a preset distance from the first electrode 1; the first end of the first impedance circuit 10 is connected to the second electrode 2, the first end of the second impedance circuit 20 is connected to the second electrode 2, the selection switch circuit 30 has a controlled end, a first connection end and a second connection end, the first connection end of the selection switch circuit 30 is connected to the first electrode 1, the second connection end of the selection switch circuit 30 is selectively connected to the second end of the first impedance circuit 10 to form a first conduction path or to the second end of the second impedance circuit 20 to form a second conduction path, the first input end of the signal processing circuit 40 is respectively connected to the first end of the first impedance circuit 10 and the first end of the second impedance circuit 20, the second input end of the signal processing circuit 40 is connected to the second connection end of the selection switch circuit 30, the sampling end of the control circuit 50 is connected to the output end of the signal processing circuit 40, and the control signal output end of the control circuit 50 is connected to the controlled end of the selection switch circuit 30.
Wherein the first impedance circuit 10 outputs a first electrical signal according to the stray current between the first electrode 1 and the second electrode 2; the impedance value of the second impedance circuit 20 is different from the impedance value of the first impedance circuit 10, and the second impedance circuit 20 outputs a second electrical signal according to the stray current between the first electrode 1 and the second electrode 2; the signal processing circuit 40 performs signal processing on the first electrical signal and the second electrical signal; the control circuit 50 is configured to obtain an electrical signal output by the signal processing circuit 40, store the electrical signal as a first sampling voltage value when the electrical signal is greater than a preset voltage, and control the selection switch circuit 30 to switch to another conduction path to obtain a second sampling voltage value; the control circuit 50 also determines a resistance value between the first electrode 1 and the second electrode 2 according to the first sampling voltage value and the second sampling voltage value.
The utility model discloses a first impedance circuit 10 and second impedance circuit 20 detect out first signal of telecommunication and second signal of telecommunication respectively, because the wandering current in the earth detects as the current source, and the impedance value of first impedance circuit 10 with the impedance value of second impedance circuit 20 is different, thereby can insert the wandering current in the earth respectively with first impedance circuit 10 and second impedance circuit 20 and detect as the current source thereby obtain two different sample values, be first sampling pressure value and second sample value respectively, can obtain ground resistance value according to first sampling pressure value and second sample value, because this moment with the wandering current in the earth as the current source, thereby the influence of wandering current to the testing result has been got rid of, thereby solved natural field and leaded to the technical problem that the ground resistance is measured inaccurately and need the power supply among the ground resistance measurement easily. It should be noted that the preset distance is set according to actual installation requirements and actual applications.
Therefore, the utility model discloses still have following advantage:
1. there is no need to separately purchase and carry a multimeter.
2. The influence of the natural field on the measurement can be overcome.
3. The ground resistance can be measured by a plurality of measuring channels at the same time, and the measuring efficiency is improved.
The natural field interference signal is used as a measurement signal source of electrode ground resistance, and is marked as Vs, the sum of the ground resistances of the first electrode 1 and the second electrode 2 which are connected in series is assumed to be Rs, the wire resistance can be ignored, and the first impedance circuit 10 and the second impedance circuit 20 are respectively marked as R1 and R2. The process of determining the resistance value Rs between the first electrode 1 and the second electrode 2 according to the first sampling voltage value and the second sampling voltage value is as follows:
the receiver (detection data output instrument) drives the program control switch to select R1 as the input impedance of the instrument through the control circuit 50, and the signal measured by the receiver signal measurement module is V1; the receiver drives the program control switch through the control circuit 50 to select R2 as the input impedance of the instrument, and the signal measured by the receiver signal measurement module is V2 at the moment; according to ohm's theorem, the equations for step 1 and step 2, respectively, can be listed as
V1= (Vs x R1)/(Rs + R1) (formula 1)
V2= (Vs x R2)/(Rs + R2) (formula 2)
Formula 2 divided by formula 1 has:
V2/V1= [ R2 (Rs + R1) ]/[ R1 (Rs + R2) ] (formula 3)
Where V2, V1, R2 and R1 are known numbers, the value of Rs can be obtained by calculation.
It should be noted that, in the above embodiment, the first impedance circuit 10, the second impedance circuit 20, and the selection switch circuit 30 may also be expanded, multiple columns of impedance circuits may be connected in parallel to add measurement channels, and the measurement principle may also refer to the above scheme, so that the technical problem of simultaneously testing the mutual interference by multiple detection channels can be solved.
Optionally, the signal processing circuit 40 includes a signal programmable amplifying circuit, a signal absolute value detecting circuit, a signal programmable integrating circuit, and an analog-to-digital converting circuit, which are connected in sequence, and the analog-to-digital converting circuit is connected to the control circuit 50.
The natural field interference signal, namely stray current, is picked up by a first electrode 1 and a second electrode 2, is subjected to voltage division with a first resistor or a second resistor and then enters a signal program control amplifying circuit for amplification, then a signal absolute value detection circuit performs absolute value detection, a signal with alternating positive and negative is detected into a unidirectional signal, then the signal is integrated by a signal programmable integrating circuit, the integration time can be performed according to the time set by a user or a system, the integrated signal is output to an analog-to-digital conversion circuit, and finally the converted digital signal is read by a control circuit 50 to finish dimensional change and calculation. The control circuit 50 comprises a microprocessor, a peripheral circuit and a program-controlled switch control circuit, and by the scheme, the reliability and the accuracy of signals can be ensured, and the purity of the signals is ensured. It should be noted that, the signal programmable amplifying circuit, the signal absolute value detecting circuit, the signal programmable integrating circuit, and the analog-to-digital converting circuit mentioned in the above circuits may be implemented by selecting related circuits from the prior art, and are not described herein again.
Optionally, the first impedance circuit 10 includes a first resistor, a first end of the first resistor is a first end of the first impedance circuit 10, and a second end of the first resistor is a second end of the first impedance circuit 10.
At this time, if the first impedance circuit 10 is connected to the current source formed by the stray current through the programmable switch, the first resistor exists as a load connected in series with the current source, and the collection of the first sampling voltage value can be realized. The above structure satisfies ohm's law.
Optionally, the second impedance circuit 20 includes a second resistor, a first end of the second resistor is a first end of the second impedance circuit 20, and a second end of the second resistor is a second end of the second impedance circuit 20.
At this time, if the second impedance circuit 20 is connected to the current source formed by the stray current through the programmable switch, the second resistor exists as a load connected in series with the current source, and the collection of the second sampling voltage value can be realized. The above structure satisfies ohm's law. Therefore, in this case, the ground resistance between the first electrode 1 and the second electrode 2 can be calculated.
Optionally, the selection switch circuit 30 includes a program-controlled switch, a first end of the program-controlled switch is a first connection end of the selection switch circuit 30, a second end of the program-controlled switch is a second connection end of the selection switch circuit 30, and a controlled end of the program-controlled switch is a controlled end of the selection switch circuit 30.
The programmable switch can be switched in the first resistor or the second resistor according to the control signal of the programmable switch control circuit 50, so that the measurement switching of the impedance circuits with different resistance values can be realized quickly.
Optionally, the circuit for measuring two-terminal ground resistance by using a natural field further includes a human-computer interaction circuit, and the human-computer interaction circuit is connected with the control circuit 50.
The human-computer interaction circuit is used for displaying the result obtained by the control circuit 50. In the present application, the man-machine switching circuit is a display circuit such as a display screen.
The working principle of the present invention is described below with reference to fig. 1:
the microcontroller drives the program-controlled switch through the control circuit 50 to select the first impedance circuit 10 as the input impedance of the instrument, the impedance of the first impedance circuit 10 is recorded as R1, and a signal measured by a signal measurement module of the microcontroller is V1 at this time; the microcontroller drives the program-controlled switch through the control circuit 50 to select the second impedance circuit 20 as the input impedance of the instrument, the impedance of the second impedance circuit 20 is recorded as R2, and at this time, the signal measured by the receiver signal measurement module is V2; according to ohm's theorem, the equations for step 1 and step 2, respectively, can be listed as
V1= (Vs x R1)/(Rs + R1) (formula 1)
V2= (Vs x R2)/(Rs + R2) (formula 2)
Formula 2 divided by formula 1 has:
V2/V1= [ R2 (Rs + R1) ]/[ R1 (Rs + R2) ] (formula 3)
Where V2, V1, R2 and R1 are known numbers, the value of Rs can be obtained by calculation. Therefore, the scheme solves the problems that the ground resistance measurement is inaccurate easily caused by a natural field, and power supply is needed and is increased in the ground resistance measurement
The technical problem of mutual interference is simultaneously tested by the detection channels.
In order to solve the above problem, the present invention further provides an apparatus for measuring two-terminal ground resistance using a natural field, wherein the electronic apparatus includes the circuit for measuring two-terminal ground resistance using a natural field as described above.
It should be noted that, since the device for measuring two-terminal ground resistance using a natural field according to the present application includes all embodiments of the circuit for measuring two-terminal ground resistance using a natural field, all schemes for measuring a two-terminal ground resistance using a natural field can be implemented by using a device for measuring two-terminal ground resistance using a natural field, and have the same beneficial effects, which are not described herein again.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (7)
1. A circuit for measuring two-terminal ground resistance using a natural field, comprising:
a first electrode for grounding;
the second electrode is used for grounding and is arranged at a preset distance from the first electrode;
a first impedance circuit, a first end of which is connected to the second electrode and is configured to output a first electrical signal according to a stray current between the first electrode and the second electrode;
a second impedance circuit having a different impedance value from the first impedance circuit, a first end of the second impedance circuit being connected to the second electrode and configured to output a second electrical signal according to a stray current between the first electrode and the second electrode;
the selection switch circuit is provided with a controlled end, a first connecting end and a second connecting end, the first connecting end of the selection switch circuit is connected with the first electrode, and the second connecting end of the selection switch circuit can be selectively connected with the second end of the first impedance circuit to form a first conduction path or connected with the second end of the second impedance circuit to form a second conduction path;
a first input end of the signal processing circuit is connected with a first end of the first impedance circuit and a first end of the second impedance circuit respectively, and a second input end of the signal processing circuit is connected with a second connecting end of the selection switch circuit and is used for processing the first electric signal and the second electric signal;
the sampling end of the control circuit is connected with the output end of the signal processing circuit, the control signal output end of the control circuit is connected with the controlled end of the selection switch circuit and used for acquiring the electric signal output by the signal processing circuit, storing the electric signal as a first sampling voltage value when the electric signal is greater than a preset voltage, and controlling the selection switch circuit to be switched to another conduction path to acquire a second sampling voltage value;
the control circuit is further configured to determine a resistance value between the first electrode and the second electrode according to the first sampling voltage value and the second sampling voltage value.
2. The circuit for measuring two-terminal ground resistance using a natural field according to claim 1, wherein the signal processing circuit comprises a signal programmable amplifying circuit, a signal absolute value detecting circuit, a signal programmable integrating circuit and an analog-to-digital conversion circuit, which are connected in sequence, and the analog-to-digital conversion circuit is connected with the control circuit.
3. The circuit of claim 1, wherein the first impedance circuit comprises a first resistor, a first end of the first resistor being a first end of the first impedance circuit, a second end of the first resistor being a second end of the first impedance circuit.
4. The circuit of claim 1, wherein the second impedance circuit comprises a second resistor, a first end of the second resistor being a first end of the second impedance circuit, a second end of the second resistor being a second end of the second impedance circuit.
5. The circuit of claim 1, wherein the selection switch circuit comprises a programmable switch, a first terminal of the programmable switch is a first connection terminal of the selection switch circuit, a second terminal of the programmable switch is a second connection terminal of the selection switch circuit, and a controlled terminal of the programmable switch is a controlled terminal of the selection switch circuit.
6. The circuit for measuring two-terminal ground resistance using natural fields of claim 1, further comprising a human-machine interaction circuit coupled to the control circuit.
7. An apparatus for measuring two-terminal ground resistance using a natural field, comprising the circuit for measuring two-terminal ground resistance using a natural field according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221455627.2U CN218629989U (en) | 2022-06-10 | 2022-06-10 | Circuit and device for measuring two-terminal grounding resistance by using natural field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221455627.2U CN218629989U (en) | 2022-06-10 | 2022-06-10 | Circuit and device for measuring two-terminal grounding resistance by using natural field |
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| Publication Number | Publication Date |
|---|---|
| CN218629989U true CN218629989U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221455627.2U Active CN218629989U (en) | 2022-06-10 | 2022-06-10 | Circuit and device for measuring two-terminal grounding resistance by using natural field |
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| CN (1) | CN218629989U (en) |
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- 2022-06-10 CN CN202221455627.2U patent/CN218629989U/en active Active
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