CN206002607U - A kind of soil resistivity measurement and ground network ground resistance acquisition device - Google Patents
A kind of soil resistivity measurement and ground network ground resistance acquisition device Download PDFInfo
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- CN206002607U CN206002607U CN201621039724.8U CN201621039724U CN206002607U CN 206002607 U CN206002607 U CN 206002607U CN 201621039724 U CN201621039724 U CN 201621039724U CN 206002607 U CN206002607 U CN 206002607U
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- 238000005259 measurement Methods 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 230000005284 excitation Effects 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 10
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 9
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims description 5
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The utility model proposes a kind of soil resistivity measurement and ground network ground resistance acquisition device, belong to technical field of power systems, the device includes casing, four test electrodes and circuit part, wherein circuit part is arranged at box house, and four test electrodes connect circuit part by the through hole on casing；Four described test electrodes, including earthing pole, boost voltage pole, voltage pole and electric current pole；The device adopts quadrupole measurement structure, i.e., increase a boost voltage pole on the basis of three poles, eliminates the impact of mutual inductance between measurement lead；When measurement electric current injects tested earth mat, to infinite point wandering when, earth mat is with respect to the earth resistance that the voltage of infinite point and the ratio of test electric current are earth mat；The device is avoided power frequency measurement, makes interference signal and measured signal current separation, it is not necessary to which current value is too big, improve certainty of measurement, reduce weight of equipment by reducing potential principle, and the device box structure is portable easy to operate, improves person works' operating efficiency.
Description
Technical field
The utility model belongs to technical field of power systems, and in particular to a kind of soil resistivity measurement and mesh grounding electricity
Resistance acquisition device.
Background technology
The general whether qualified main criterion of earth mat is its grounding resistance；Impact ground network ground resistance value principal element bag
Include soil resistivity and two aspect of ground connection web frame；Generally soil is not uniform, and the soil resistivity of each layer is also different, with
When soil resistivity affected by seasonal factor, measuring method, it is larger to measure each layer soil resistivity error, in this case
More it is necessary that strengthening the earth resistance rate to stratified soil measures；The general measure stage cannot estimate rapidly the pre- earth mat that lays
Earth resistance, it is necessary to wait until that the design phase could be counted with special-purpose software input soil resistivity and ground connection network parameters by designer
Calculate grounded screen electric resistance value；Measuring phases cannot estimate out the pre- earth resistance for laying earth mat.
As traditional soil resistivity measurement apparatus measurement is got up pretty troublesome, measurement error is larger and more unstable
Fixed, employee's high labor intensive when measuring；Plan is laid ground network ground resistance estimate and is also required in design phase software
Can just draw after input related data, it is impossible to judge to plan to build position in time if appropriate for laying grounded screen.
Soil resistivity measurement is inaccurate, mainly has problems in three links：
1st, signals collecting problem
Generally soil resistivity measurement is carried out using Fast Fourier Transform (FFT) (FFT), but same due to existing in sampling process
Step sampling and truncated problem complete cycle, cause fence effect and spectrum leakage, and this will have influence on the accuracy of sampled result；
2nd, measure error is eliminated
Three electrode method is less in southern area measurement soil resistivity error, but soil model is required higher；For northeast
Area, soil regime complex area, soil resistivity is measured due to the shadow of the mutual inductance problem of signal interference, electric current pole and potential pole
Sound is larger, causes measure error larger, is unsatisfactory for our measurement request；
3rd, Hz noise problem
What between the power frequency grounding current EMI in soil resistivity measurement and lead, interference was always measured is difficult to solution
Problem.Eliminate power current interference most directly effectively method be exactly the measurement that has a power failure, but scene and be difficult to.
Utility model content
For the deficiencies in the prior art, the utility model proposes a kind of measurement of soil resistivity and ground network ground resistance are obtained
Device, the device solve traditional grounding resistance measurement resultant error greatly well, have higher antijamming capability, are suitable for complexity
Complete to measure work under ground condition.
A kind of soil resistivity measurement and ground network ground resistance acquisition device, the device include casing, four test electrodes
And circuit part, wherein circuit part is arranged at box house, and four test electrodes connect circuit portion by the through hole on casing
Point；
Four described test electrodes, including：Earthing pole, boost voltage pole, voltage pole and electric current pole, wherein, electrode cloth
Line mode adopts isosceles triangle wire laying mode, and electrode adopts beryllium copper rod；
Described circuit part, including：Pincers current sensor, front-end protection module, front end signal processor, A/D conversion
Module, single-chip microcomputer, human-machine interface module, communication module, outside extension storage module, variable frequency excitation module and power module；Its
In, clamp the first input end of the output end connection front-end protection module of current sensor, the output end connection of front-end protection module
The input of front end signal processor, the input of the output end connection A/D modular converter of front end signal processor, A/D are changed
The input of the output end connection single-chip microcomputer of module, described single-chip microcomputer and human-machine interface module, communication module and outside extension
Memory module is connected；The input of the output end connection variable frequency excitation module of single-chip microcomputer, the output end of variable frequency excitation module connect
Connect the second input of front-end protection module；Described power module is connected with single-chip microcomputer.
Four described test electrodes, connect the pincers current sensor of box house by through hole.
Described casing, including：Case lid, upper surface, side wall and base plate；Wherein, test electricity is provided with described side wall
Pole through hole, usb data hole, vent and rotary knob；Described upper surface be provided with Data input section, function selection area,
Display screen and power switch.
Described isosceles triangle wire laying mode, i.e. electric current pole and voltage pole lead all take 20 meters, and earthing pole is electric with auxiliary
Pressure interpolar is divided into 2 meters.
Described beryllium copper rod, its a diameter of 3cm, four test electrode body length are 50cm, and configure many 100cm and prolong
Long barred body.
The utility model advantage：
The utility model proposes a kind of soil resistivity measurement and ground network ground resistance acquisition device, due to three poles that commonly uses
In penalty method measurement process, interference effect is larger, bad in complicated in-site measurement effect, and therefore the device is using quadrupole measurement knot
Structure, i.e., increase a boost voltage pole on the basis of three poles, eliminates the impact of mutual inductance between measurement lead；When measurement electric current injects quilt
Geodetic net, to infinite point wandering when, earth mat with respect to infinite point voltage with to test the ratio of electric current be connecing for earth mat
Ground resistance；The device is avoided power frequency measurement, makes interference signal and measured signal current separation, make by reducing potential principle
Interference signal can not enter measuring system, and then eliminate the error impact that power frequency causes；Due to avoiding power frequency, need not during measurement
Current value is too big, so that it may improves certainty of measurement, and reduces weight of equipment, is easy to in-site measurement, additionally, the device box structure
Portable easy to operate, improve person works' operating efficiency.
Description of the drawings
Fig. 1 is a kind of body structure schematic diagram of embodiment of the utility model,
Fig. 2 is a kind of rotating handles schematic diagram of embodiment of the utility model；
Fig. 3 is a kind of upper end surface structure schematic diagram of embodiment of the utility model；
Fig. 4 is a kind of four test electrode structure schematic diagrames of embodiment of the utility model；
Fig. 5 is a kind of circuit part structural representation of embodiment of the utility model；
Fig. 6 is a kind of signal amplification circuit circuit theory diagrams of embodiment of the utility model；
Fig. 7 is a kind of A/D modular converter circuit theory diagrams of embodiment of the utility model；
Fig. 8 is a kind of communication module circuitry schematic diagram of embodiment of the utility model；
Fig. 9 is a kind of variable frequency excitation modular circuit schematic diagram of embodiment of the utility model.
Specific embodiment
Below in conjunction with the accompanying drawings a kind of embodiment of the utility model is described further.
In the utility model embodiment, soil resistivity measurement and ground network ground resistance acquisition device include casing, four
Test electrode and circuit part, wherein circuit part are arranged at box house, and four test electrodes are connected by the through hole on casing
Connect circuit part；
In the utility model embodiment, as shown in figure 1, casing includes：Case lid, upper surface, side wall and base plate；Side wall is arranged
In base plate surrounding, upper end is provided with upper surface, between case lid and device body by rotating shaft build connection, rotatable raise, right
Device body display screen, button play defencive function；Test electrode through hole, usb data hole, air draft is provided with described side wall
Hole (according to temperature conditions, equipment being aerated, to adapt to the use of equipment under high temperature) and rotary knob；As shown in Fig. 2
Described rotating handles is arranged at side wall by rotating shaft, and rotating handles is circular arc, and another side is straight line, works as straight line
When outwardly, handle is hidden, facilitates picking and placeing for device.As shown in figure 3, described upper surface is provided with Data input section, function choosing
Area, display screen and power switch is selected, Data input section is mainly input into the performance data for proposing earth mat, function selection area is mainly responsible for
The function of control device is selected, is reset, and sends measurement, measuring and calculating instruction, and this each button of two parts functional area is man-machine by equipment
Interface realizes the information exchange of people and equipment.
In the utility model embodiment, as shown in figure 4,1 point of in figure is earthing pole, 4 points is auxiliary voltage pole, and 2 points is electricity
Pressure pole, 3 points is electric current pole；When applying electric current is asked in 1 point of earthing pole and 3 points of electric current pole, can measure respectively between 1,2,4 each points
Potential difference U12、U14And U24；4 electrodes are connected with pincers current sensor part；In measurement process, wire laying mode adopts isosceles
Triangle wiring (reduce wiring mutual inductance impact), electric current pole, voltage pole lead all take 20 meters, earthing pole and boost voltage interpolar every
2 meters；This approach avoid needs to measure caused inconvenience and error in multiple spot so that measurement is more simple, measurement
Value is more accurate.In the utility model embodiment, measured using four-electrode method, electrode is using the beryllium copper rod of diameter 3cm；Electrode body
Length is 50cm, and configures many 100cm prolongation barred bodies, and to meet deep soil resistivity measurement, end 10cm adopts circular cone
Body structure, it is easy to reduce the depth sounding resistance of electrode in measurement；Measuring electrode is placed in during measurement the centre position of every layer of soil；
Electrode adopts shielding line with device on line, reduces signal interference, improves accuracy of measurement.
In the utility model embodiment, as shown in figure 5, circuit part includes：Pincers current sensor, front-end protection module,
Front end signal processor (including signal amplification circuit, as shown in Figure 6), A/D modular converter (are ICL7135 using chip, with list
Piece machine annexation is as shown in Figure 7), single-chip microcomputer (with the 89C52 series monolithic of atmel corp as detect core), human-machine interface
Mouth module, communication module (as shown in Figure 8), outside extension storage module, variable frequency excitation module (as shown in Figure 9) and power supply mould
Block；The first input end of the output end connection front-end protection module of pincers current sensor, the output end connection of front-end protection module
The input of front end signal processor, the input of the output end connection A/D modular converter of front end signal processor, A/D are changed
The input of the output end connection single-chip microcomputer of module, described single-chip microcomputer and human-machine interface module, communication module and outside extension
Memory module is connected；The input of the output end connection variable frequency excitation module of single-chip microcomputer, the output end of variable frequency excitation module connect
Connect the second input of front-end protection module；Described power module is connected with single-chip microcomputer.
In the utility model embodiment, power module：For the power supply of the analog- and digital- part to whole hardware system,
Part being realized including variable-frequency power sources, while being charged to battery, being attached by electric power loop with each funtion part.Single
Piece machine：For being processed to the data of whole measuring system and being controlled.Pincers current sensor：For realizing to electric signal (mould
Analog quantity) collection.Front-end protection module：For realizing the safety input of the protection to measuring system circuit and signal.Front end is believed
Number processor：It is filtered, amplifies or attenuation processing for the voltage and current signal to gathering, to adapt to A/D change-over circuit
Input range.A/D modular converter：A/D conversion is carried out for the voltage and current signal to introducing.Variable frequency excitation module：For
Application DDS technology, control design case sinusoidal excitation circuit and software are realized, and can effectively be avoided Hz noise and be improved resistance measurement essence
Degree.Outside extension storage module：Memory expansion, for storing configuration software and real-time measuring data.Human-machine interface module：
Show for realizing button operation and liquid crystal display.Communication module：For realizing serial line interface transmission.In front-end protection module also
Need input measurement input signal：For realizing the collection of voltage and current signal and the output of driving source.
In the utility model embodiment, between 60Hz-110Hz, interfering energy is less for measurement frequency, can effectively eliminate work
The problem of frequency signal interference；
In the utility model embodiment, soil resistivity measurement process：By detecting input signal or pincers current sense
Device collection electric parameters signal (analog signal), through front-end protection circuit, signal conditioning circuit, output to A/D modular converter, locates
Reason obtains digital quantity voltage and current signal, and single-chip microcomputer is given in conversion, and single-chip microcomputer is processed to the voltage x current data for collecting,
Obtain soil resistivity and its relevant parameter；Shown by key-press input and liquid crystal display complete soil resistivity data process,
Store, show and carry out communication conversion；Device signals collecting part adopts the windowing algorithm of the combination cosine based on convolution window,
And the result of FFT is modified by approximate interpolation, make front end signal gathered data accurately and reliably, especially complicated state, such as
During dash current, accuracy of detection is high, it is ensured that resistivity measurement and analysis are accurately.
In the utility model embodiment, ground network ground resistance calculates process：By man-machine interface, input is intended laying earth mat
Horizontal grounding strip length, peripheral lengths, horizontal grounding band equivalent redius, laying depth, vertical grounding electrode radical, vertical grounding electrode
Length, vertical grounding electrode equivalent redius；Using the stratified soil resistivity data for measuring and store, plan is calculated by single-chip microcomputer and is applied
If the earth resistance of earth mat, and shown by liquid crystal display, communication conversion is stored and is carried out to result of calculation.
Claims (5)
1. a kind of measurement of soil resistivity and ground network ground resistance acquisition device, it is characterised in that the device include casing, four
Test electrode and circuit part, wherein circuit part are arranged at box house, and four test electrodes are connected by the through hole on casing
Connect circuit part；
Four described test electrodes, including：Earthing pole, boost voltage pole, voltage pole and electric current pole, wherein, electrode wiring side
Formula adopts isosceles triangle wire laying mode, and electrode adopts beryllium copper rod；
Described circuit part, including：Pincers current sensor, front-end protection module, front end signal processor, A/D modular converter,
Single-chip microcomputer, human-machine interface module, communication module, outside extension storage module, variable frequency excitation module and power module；Wherein, clamp
The first input end of the output end connection front-end protection module of current sensor, the output end connection front end letter of front-end protection module
The input of number processor, the input of the output end connection A/D modular converter of front end signal processor, A/D modular converter
The input of output end connection single-chip microcomputer, described single-chip microcomputer and human-machine interface module, communication module and outside extension storage mould
Block is connected；The input of the output end connection variable frequency excitation module of single-chip microcomputer, the output end connection front end of variable frequency excitation module
Second input of protection module；Described power module is connected with single-chip microcomputer.
2. soil resistivity according to claim 1 is measured and ground network ground resistance acquisition device, it is characterised in that described
Four test electrodes, by through hole connect box house pincers current sensor.
3. soil resistivity according to claim 1 is measured and ground network ground resistance acquisition device, it is characterised in that described
Casing, including：Case lid, upper surface, side wall and base plate；Wherein, test electrode through hole, USB number are provided with described side wall
According to hole, vent and rotary knob；Described upper surface is provided with Data input section, function selection area, display screen and power supply
Switch.
4. soil resistivity according to claim 1 is measured and ground network ground resistance acquisition device, it is characterised in that described
Isosceles triangle wire laying mode, i.e. electric current pole and voltage pole lead all take 20 meters, earthing pole and boost voltage interpolar are divided into 2
Rice.
5. soil resistivity according to claim 1 is measured and ground network ground resistance acquisition device, it is characterised in that described
Beryllium copper rod, its a diameter of 3cm, four test electrode body length are 50cm, and configure many 100cm and extend barred bodies.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621039724.8U CN206002607U (en) | 2016-09-06 | 2016-09-06 | A kind of soil resistivity measurement and ground network ground resistance acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621039724.8U CN206002607U (en) | 2016-09-06 | 2016-09-06 | A kind of soil resistivity measurement and ground network ground resistance acquisition device |
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| CN206002607U true CN206002607U (en) | 2017-03-08 |
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| CN201621039724.8U Expired - Fee Related CN206002607U (en) | 2016-09-06 | 2016-09-06 | A kind of soil resistivity measurement and ground network ground resistance acquisition device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051647A (en) * | 2017-12-01 | 2018-05-18 | 湖北省电力勘测设计院有限公司 | A kind of method of wind power plant soil resistivity correction measurement |
| CN109709438A (en) * | 2018-12-26 | 2019-05-03 | 云南电网有限责任公司楚雄供电局 | A kind of reverse short distance measurement pressure-wire of grounded screen and current line mutual inductance influence model |
| CN110118896A (en) * | 2018-11-13 | 2019-08-13 | 清华大学 | A kind of method and system measuring stratified soil resistivity and dielectric constant frequency dependent characteristic |
| CN111856143A (en) * | 2020-08-04 | 2020-10-30 | 云南电力技术有限责任公司 | Grounding impedance test method and device for eliminating mutual inductance influence |
| CN114898638A (en) * | 2021-12-15 | 2022-08-12 | 北京市科学技术研究院城市安全与环境科学研究所 | Ground resistance measurement training device |
-
2016
- 2016-09-06 CN CN201621039724.8U patent/CN206002607U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051647A (en) * | 2017-12-01 | 2018-05-18 | 湖北省电力勘测设计院有限公司 | A kind of method of wind power plant soil resistivity correction measurement |
| CN108051647B (en) * | 2017-12-01 | 2020-05-01 | 湖北省电力勘测设计院有限公司 | Method for correcting and measuring soil resistivity of wind power plant |
| CN110118896A (en) * | 2018-11-13 | 2019-08-13 | 清华大学 | A kind of method and system measuring stratified soil resistivity and dielectric constant frequency dependent characteristic |
| CN109709438A (en) * | 2018-12-26 | 2019-05-03 | 云南电网有限责任公司楚雄供电局 | A kind of reverse short distance measurement pressure-wire of grounded screen and current line mutual inductance influence model |
| CN109709438B (en) * | 2018-12-26 | 2021-06-01 | 云南电网有限责任公司楚雄供电局 | Reverse short-distance measurement voltage line and current line mutual inductance influence model for grounding grid |
| CN111856143A (en) * | 2020-08-04 | 2020-10-30 | 云南电力技术有限责任公司 | Grounding impedance test method and device for eliminating mutual inductance influence |
| CN114898638A (en) * | 2021-12-15 | 2022-08-12 | 北京市科学技术研究院城市安全与环境科学研究所 | Ground resistance measurement training device |
| CN114898638B (en) * | 2021-12-15 | 2024-04-26 | 北京市科学技术研究院城市安全与环境科学研究所 | Ground resistance measurement training device |
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Granted publication date: 20170308 Termination date: 20170906 |
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| CF01 | Termination of patent right due to non-payment of annual fee |