CN109633354A - A kind of uniform soil model of reverse short distance measurement device - Google Patents
A kind of uniform soil model of reverse short distance measurement device Download PDFInfo
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- CN109633354A CN109633354A CN201811604912.4A CN201811604912A CN109633354A CN 109633354 A CN109633354 A CN 109633354A CN 201811604912 A CN201811604912 A CN 201811604912A CN 109633354 A CN109633354 A CN 109633354A
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- soil
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- short distance
- distance measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of uniform soil models of reverse short distance measurement device, it is relatively more mainly for the soil model used in existing engineering calculation, including uniform soil, Horizontal Layer Soil, vertical demixing soil, the ideal soils model such as piecemeal soil, but it is clear that seldom there is ideal soil model in actual soil environment, in addition to valley, abrupt slope, river has in this way outside the obvious layered structure of irregular shape, most of soil is all that the random combine Multi-layer Horizontal Soil soil model of Multiple components considers the geological phenomenon that geologic structure has layering variation, the present invention considers the geology that geologic structure has layering variation, using the uniform soil model for simplifying two multilayer extracting of level or equivalent soil resistivity, simplified using Equal resistivity, difficulty in computation can be reduced, improve computational efficiency.
Description
Technical field
The present invention relates to the uniform soil modelling technique field of reverse short distance measurement device, specially a kind of reverse short distance is surveyed
Measure the uniform soil model of device.
Background technique
Grounding net of transformer substation is the important leverage of grid equipment safe operation, staff's personal safety.Grounded screen is each
Kind electrical equipment is with providing common reference, it is often more important that, it, can be fast when ground fault or near region lightning stroke equipment occur for system
Fast effectively release fault current or lightning current improve grounded screen metallic conductor and the distribution of place surface potential.Grounded screen can
The operation of first and second equipment and the personal safety of support personnel are played an important role by running.The standard of grounded screen characterisitic parameter
Really measurement is the basis grasped grounded screen runnability, carry out grounded screen work, is the work such as operation and maintenance, the transformation of grounded screen
Direct foundation is provided, there is important current demand and directive significance.Existing ground resistance measurement method is mainly long line
Method needs to arrange 4~5 times of measurement of length leads of grounded screen equivalent diameter in measurement, in recent years as extra-high voltage grade is defeated
The construction of electric system and the expansion of power grid scale, the quantity of extensive substation is more and more, and the size of grounded screen also becomes
Very huge, individual power station Resistance of Grounding Grids surveying setting-outs have been even up to tens kilometers, in entire measurement process
Pressure-wire and current line setting-out work account for 90% or more of entire ground network ground resistance measurement workload, therefore, research and develop substation
The short distance measuring device of ground network ground resistance is worth with important practical engineering application.
Summary of the invention
The purpose of the present invention is to provide a kind of uniform soil models of reverse short distance measurement device, mainly for existingly
Net test setting-out work amount is big, which can shorten to current feed length 2D~2.5D, save workload half with
On, can be used for grounded screen especially large-scale grounding network ground resistance measurement work, while also can be applied to bare soil compared with
Few transformer substation in city ground network ground resistance measurement, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme: a kind of uniform soil of reverse short distance measurement device
Model, including measuring device, soil model and measurement lead, the measuring device are connected by measuring lead with soil model；
Measuring device includes measurement module, PC serial ports, power supply control serial ports and power supply, and the measurement module is provided with PC string
Mouth, power supply control serial ports, and the power supply controls serial ports by power supply and is connected with measurement module.
Preferably, the measurement module includes shell, the first trapper, voltage transformer, current transformer, A/D conversion
Device and dsp chip, the interior of shell are provided with two-way trapper, voltage transformer, current transformer, A/D converter and DSP
Chip.
Preferably, the soil model is the uniform soil for simplifying two multilayer extracting of level or equivalent soil resistivity
Model is one such or a variety of.
Preferably, two multilayer extracting of simplified level includes upper layer of soil and lower soil, the upper layer of soil
Lower surface is connected with lower soil upper surface.
Preferably, the uniform soil model of the equivalent soil resistivity includes left side soil and right side soil, the left side
Side soil side is connected with right side soil side.
Compared with prior art, the beneficial effects of the present invention are:
The present invention considers the geology that geologic structure has layering variation, using simplified two multilayer extracting of level or waits
It is worth the uniform soil model of soil resistivity, is simplified using Equal resistivity, difficulty in computation can be reduced, improves computational efficiency.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is measuring device structural schematic diagram.
Fig. 3 is measurement module structural schematic diagram.
Fig. 4 is to simplify two multilayer extracting structural schematic diagram of level.
Fig. 5 is the uniform soil model structure schematic diagram of equivalent soil resistivity.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of technical solution referring to FIG. 1-2: a kind of uniform soil mould of reverse short distance measurement device
Type, including measuring device 1, soil model 2 and measurement lead 3, measuring device 1 are connected by measuring lead 3 with soil model 2；
Measuring device 1 includes that measurement module 11, PC serial ports 12, power supply control serial ports 13 and power supply 14, measurement module 11 are set
It is equipped with PC serial ports 12, power supply control serial ports 13, the power supply 14 controls serial ports 13 by power supply and is connected with measurement module 11.
As shown in figure 3, measurement module 11 includes shell 111, the first trapper 112, voltage transformer 113, Current Mutual Inductance
Device 114, A/D converter 115 and dsp chip 116, shell 111 be internally provided with two-way trapper 112, voltage transformer 113,
Current transformer 114, A/D converter 115 and dsp chip 116.
As shown in figure 4, simplifying two multilayer extracting 21 of level includes upper layer of soil 211 and lower soil 212, topsoil
211 lower surface of earth is connected with 212 upper surface of lower soil.
As shown in figure 5, the uniform soil model 22 of equivalent soil resistivity includes left side soil 221 and right side soil 222,
Soil 221 side in left side is connected with 222 side of right side soil.
For measuring device 1 using STM32F407 as kernel processing device, TM32F407 possesses the dominant frequency of 168MHz, integrates
The RAM of the ROM and 192KB of 1MB, the ADC of 12 10KHz sample frequencys, embedded analysis system realize human-computer interaction, by programming
The measuring process of setting realizes all automatic measurement, display and storage.Measuring signal is respectively voltage and current two-way, is passed through respectively
Accurate voltage current sensor, two-way 50Hz trapper, gain-programmed amplifier, A/D converter, input STM32F407 in into
Row digital filtering, data calculate and data storage.
Instrument uses high integration universal active filter, it has the characteristics that design convenient, using flexible.Pass through change
The circuit parameter of UAF42 may be constructed the various filters for meeting actual demands of engineering.UAF42 Embedded design filter
Required resistance and capacitor only needs only a few external devices that can easily constitute an active filter in the application.
Using adjustable (state-variable) model configuration of typical state, it is internally integrated a sign-changing amplifier and two integrals
Device.The product device includes the capacitor of 1000 μ F (± 5%).Therefore it preferably resolves in active wave device design and obtains low-loss
(low-loss) the problem of capacitor.Therefore the double T traps of two-stage being carried out using two panels UAF42, bandwidth is all 15Hz, second-order circuit,
Trap centre frequency is respectively 49.8Hz and 50.2Hz.When trap frequency is 49.8Hz, the parameter selection of software calculating are as follows: fall into
Wave point is 49.8Hz, and resistance band 15Hz, order 2, input mode is homophase input.It is soft when trap frequency is 50.2Hz
The parameter of part calculating are as follows: trap wave point 50.2Hz, resistance band 15Hz, order 2, input mode are homophase input.
Gain-programmed amplifier refers to the amplifier that can change gain by software program, it can be adapted on a large scale automatically
The analog signal of variation adjusts the gain of amplifier for the size of measured signal, and the analog signal of different amplitudes is amplified
Guarantee that back-end circuit is worked normally to some particular range.
Serial port liquid crystal display screen is the dedicated graphics processor of single-chip microcontroller, and system uses 32 ARM kernel single-chip microcontroller+SPI
Memory in cost and has enough advantages in performance.
The diffusing medium of grounded screen is soil, and there are many component content in soil, including soil, sand, rock, water, coagulation
Soil etc..The factors such as the electric conductivity of soil and soil types, component ratio, elastic sparse degree are related.Therefore soil resistivity
It is an equivalent concept.The soil model used in existing engineering calculation is relatively more, including uniform soil, horizontal slice soil
The ideal soils models such as earth, vertical demixing soil, piecemeal soil.But it is clear that seldom there is ideal soil in actual soil environment
Earth model.Other than valley, abrupt slope, river have the obvious layered structure of irregular shape in this way, most of soil is all more
The random combine Multi-layer Horizontal Soil soil model of kind ingredient considers the geological phenomenon that geologic structure has layering variation, is answered
For in Grounding calculation.
Embodiment one: using simplified two multilayer extracting of level
Equally taken when soil is two layered structure of level, under stratified soil structure by electric current pole be equivalent to point electric current source into
Row calculates, and according to image method principle, obtains the current potential of arbitrary point P in soil.When soil is two layers of horizontal structure, P point current potential
VPAre as follows:
Wherein, ρ1And ρ2Respectively upper and lower layer soil resistivity, H are upper layer of soil thickness, h be point electrode away from ground away from
From.K=(ρ2-ρ1)/(ρ2+ρ1) it is reflection coefficient.
Point electric current source and measurement point are in upper layer of soil together, z=0, h=0.It can be taking human as line coordinates will be measured when measurement
It is scheduled in x-axis, therefore former formula can be with abbreviation by y=0. are as follows:
Ideal stratified soil structure is not present.Due to complicated inside soil texture, anisotropy, using common
The numerical value of the Equal resistivity for each layer that winner four-electrode method obtains can only reflect the comprehensive of its sphere of action medium under electric current field action
Characteristic is closed, the true resistance rate of underground particular medium can not be characterized.Therefore divided using two multilayer extracting of level is simplified
Analyse the analytic formula of the distribution of electric current electrode potential used in reverse short distance measurement.
Embodiment two: using the uniform soil model of equivalent soil resistivity
The depth of penetration of stream is limited, and wherein major part is present in interpolar away from the soil near depth.Distance connects
The soil of the closer finite region of earth mat influences grounded screen characteristics of the dispersed flow maximum.Therefore consider limited soil region, use
Equal resistivity simplifies, and can reduce difficulty in computation, improves computational efficiency.
Practical engineering experience both domestic and external shows in earth work when handling soil layering, can use equivalent soil electricity
The uniform soil model of resistance rate carries out simplifying processing.By taking the layering of level two as an example.
Scene is in use, the measurement and soil texture calculating of soil resistivity need to be carried out.In the condition of not soil parameters
Under, corresponding abbreviation is carried out to the formula.It can be obtained according to the vertical Equal resistivity calculation method of double-layer soil:
Average resistivity is defined as
The Equal resistivity on vertical stratification stratum are as follows:
Therefore the uniform soil model based on equivalent soil resistivity is used, herein for calculating ground potential distribution.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of uniform soil model of reverse short distance measurement device, it is characterised in that: including measuring device (1), soil model
(2) and measurement lead (3), the measuring device (1) are connected by measuring lead (3) with soil model (2)；
Measuring device (1) includes measurement module (11), PC serial ports (12), power supply control serial ports (13) and power supply (14), the survey
Amount module (11) is provided with PC serial ports (12), power supply control serial ports (13), and the power supply (14) controls serial ports (13) by power supply
It is connected with measurement module (11).
2. a kind of uniform soil model of reverse short distance measurement device according to claim 1, it is characterised in that: the measurement mould
Block (11) includes shell (111), the first trapper (112), voltage transformer (113), current transformer (114), A/D converter
(115) and dsp chip (116), the shell (111) are internally provided with two-way trapper (112), voltage transformer (113), electricity
Current transformer (114), A/D converter (115) and dsp chip (116).
3. a kind of uniform soil model of reverse short distance measurement device according to claim 1, it is characterised in that: the soil mould
Type (2) is simplified two multilayer extracting of level (21) or the uniform soil model (22) of equivalent soil resistivity is one such
Or it is a variety of.
4. a kind of uniform soil model of reverse short distance measurement device according to claim 3, it is characterised in that: the simplified water
Flat two multilayer extractings (21) include upper layer of soil (211) and lower soil (212), upper layer of soil (211) lower surface
It is connected with lower soil (212) upper surface.
5. a kind of uniform soil model of reverse short distance measurement device according to claim 3, it is characterised in that: the equivalent soil
The uniform soil model (22) of earth resistivity includes left side soil (221) and right side soil (222), the left side soil (221)
Side is connected with right side soil (222) side.
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| CN201811604912.4A CN109633354A (en) | 2018-12-26 | 2018-12-26 | A kind of uniform soil model of reverse short distance measurement device |
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| CN201811604912.4A CN109633354A (en) | 2018-12-26 | 2018-12-26 | A kind of uniform soil model of reverse short distance measurement device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596623A (en) * | 2019-09-05 | 2019-12-20 | 国网内蒙古东部电力有限公司检修分公司 | Earth electrode environment and earth current measuring platform based on mixed soil model |
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| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| CN101900764A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for measuring grounded resistance of grounded screen by short range measuring method |
| CN105954594A (en) * | 2016-06-17 | 2016-09-21 | 重庆大学 | Novel grounding network grounding resistance inverse short-distance measurement method and apparatus |
| JP2017173176A (en) * | 2016-03-24 | 2017-09-28 | 株式会社竹中電機 | Insulation resistance monitoring device, and monitoring method of the same, as well as electrically-driven control instrument |
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- 2018-12-26 CN CN201811604912.4A patent/CN109633354A/en active Pending
Patent Citations (5)
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| CN101900764A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for measuring grounded resistance of grounded screen by short range measuring method |
| CN201535758U (en) * | 2009-09-30 | 2010-07-28 | 聚光科技(杭州)股份有限公司 | Soil measuring device |
| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| JP2017173176A (en) * | 2016-03-24 | 2017-09-28 | 株式会社竹中電機 | Insulation resistance monitoring device, and monitoring method of the same, as well as electrically-driven control instrument |
| CN105954594A (en) * | 2016-06-17 | 2016-09-21 | 重庆大学 | Novel grounding network grounding resistance inverse short-distance measurement method and apparatus |
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| CN110596623A (en) * | 2019-09-05 | 2019-12-20 | 国网内蒙古东部电力有限公司检修分公司 | Earth electrode environment and earth current measuring platform based on mixed soil model |
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