CN109283396A - Ground resistance measurement method and system, the pincers resistance instrument for quantifying noiseproof feature - Google Patents
Ground resistance measurement method and system, the pincers resistance instrument for quantifying noiseproof feature Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 34
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/22—Tong testers acting as secondary windings of current transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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Abstract
The invention discloses a kind of ground resistance measurement method and systems, the pincers resistance instrument for quantifying noiseproof feature, including step 1, quantify the noiseproof feature of earth resistance tool, obtain first and compare electric current；Step 2 measures the Hz noise size of current of object to be tested, obtains second and compares electric current；Step 3, in comparison step one first compare electric current and in step 2 second compared with the size of electric current be used for earth resistance tool in step 1 to test ground resistance if second compares electric current and compare electric current no more than first.The present invention considers influence of the Hz noise electric current to test result, more meets the pincerlike meter calibrating model of field working conditions, and by experimental verification, the deficiency in perfect JJG1054-2009 " pliers-shape earthing resistance instrument " vertification regulation.
Description
Technical field
The present invention relates to ground resistance field of measuring technique, more specifically, be related to a kind of ground resistance measurement method and
System, the pincers for quantifying noiseproof feature hinder instrument.
Background technique
With the continuous development of electric system, the continuous expansion of power grid scale, commonly used, the people of various electrical equipments
Requirement to ground connection is higher and higher, and the ground resistance size of earthing or grounding means is one of the major criterion of judgement ground connection quality.Transmission of electricity
Overhead line structures ground connection is most important to the safe and stable operation of electric system, and powerline pole tower ground resistance influences lightning current energy
No lead safely in the short time is let out, with guarantee line facility will not because of lightning current impact and damage, cause power outage.
Ground resistance measurement is a kind of necessary means checked earthing or grounding means and whether reach regulatory requirements.Accurate measurement ground connection
Resistance can verify whether design of ground system is reasonable, find the variation and defect of earthed system in time, avoid due to being grounded not
Qualified and the economic loss and accident that may cause.In order to ensure ground resistance meets the requirement of design, " aerial power transmission line into
Professional etiquette journey " it provides to want the ground resistance of periodic measurement earthing or grounding means.It is greater than the shaft tower of regulatory requirements for measured value, should analyzes
Its ground resistance reason bigger than normal, and take appropriate measures, its grounding resistance is reduced, the ground connection dress of earthing or grounding means is improved
Amount.
Pincerlike earth resistance tester (referred to as " pincers resistance instrument ") test method is simple, does not need auxiliary electrode, retest
When, consistency is very good.It does not need to disconnect down conductor when test, therefore in the preventative inspection of powerline pole tower ground resistance
It is widely used in looking into.However many producers treat ground resistance and circuit as purely resistive at present, as shown in Figure 1, not examining
Consider the inductance problems of transmission line of electricity, influence of the Hz noise electric current to measurement result that test loop introduces also can be by design
Ignore.Calibrating model described in JJG1054-2009 " pliers-shape earthing resistance instrument " vertification regulation only considered ground resistance simultaneously
The calibrating of the error of indication, and influence of the Hz noise electric current to the ground resistance error of indication under actual condition is not considered.Therefore have
Necessity studies the anti-interference ability of pincers resistance instrument, so that power department hinders pincers the type selecting of pincers resistance instrument and inspection body
The calibration of instrument.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of ground resistance measurement method and systems, amount
The pincers for changing noiseproof feature hinder instrument, it is contemplated that influence of the Hz noise electric current to test result more meets the pincer of field working conditions
Table examines and determine model, and by experimental verification, the deficiency in perfect JJG1054-2009 " pliers-shape earthing resistance instrument " vertification regulation,
Be expected to be able in new regulation revision using.
The purpose of the present invention is achieved through the following technical solutions:
A kind of ground resistance measurement method, comprising:
Step 1 quantifies the noiseproof feature of earth resistance tool, obtains first and compare electric current；
Step 2 measures the Hz noise size of current of object to be tested, obtains second and compares electric current；
Step 3, described in comparison step one first compare second described in electric current and step 2 compared with electric current size,
If described second, which compares electric current, compares electric current no more than described first, earth resistance tool described in step 1 is used
In test ground resistance.
Further, the earth resistance tool includes pincers resistance instrument.
Further, the object to be tested includes the tested cable in electric power line pole tower earth mat.
Further, step 1 is first carried out in advance by the manufacturer of earth resistance tool, is surveyed in the ground resistance
It is provided with anti-Hz noise current characteristics index display device on trial work tool, compares electric current for obtaining first.
A kind of grounding resistance measuring system, comprising:
Quantization device obtains first and compares electric current for quantifying the noiseproof feature of earth resistance tool；
Test device obtains second and compares electric current for measuring the Hz noise size of current of object to be tested；
Multilevel iudge device, it is electric compared with comparing electric current second described in the step 2 for described in comparison step one first
The size of stream, if described second compares electric current and compare electric current no more than described first, by ground resistance described in step 1
Testing tool is for testing ground resistance.
Further, the earth resistance tool includes pincers resistance instrument.
Further, the object to be tested includes the tested cable in electric power line pole tower earth mat.
Further, the quantization device further includes display device, for showing anti-Hz noise current characteristics index.
Further, it if described second compares electric current and compare electric current less than described first, continues to execute Step 1: step
Two tests compare electric current until being satisfied with described second and compare electric current no more than described first, are just used for measurement of Grounding Resistance；?
Under such situation, including replacement earth resistance tool step, compare electric current no more than described until being satisfied with described second
First compares the earth resistance tool of electric current, and the measurement of Grounding Resistance tool is just used for measurement of Grounding Resistance.
A kind of pincers quantifying noiseproof feature hinder instrument, and the purposes of noiseproof feature quantizating index is for obtaining described the
One compares electric current.
The beneficial effects of the present invention are:
(1) present invention for the first time quantifies the noiseproof feature of earth resistance tool, and by the anti-interference spy after quantization
Property index be used to obtain for the first time and compare electric current, the noiseproof feature that will acquire compares electric current for power frequency with object to be tested
Interference electric current size is made comparisons, and is connect to reach calibrating earth resistance tool by comparing judgement and whether can be used in test
Ground resistance can provide new testing regulations to obtain correct earth resistance result；The present invention considers Hz noise electricity
The influence to test result is flowed, more meets the pincerlike meter calibrating model of field working conditions, and by experimental verification, it is perfect
Deficiency in JJG1054-2009 " pliers-shape earthing resistance instrument " vertification regulation, be expected to be able in new regulation revision using.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram for the mode of connection that calibration resistor method examines and determine the error of indication.
Fig. 2 is the schematic diagram of scene pincers meter method for measuring electric power line pole tower insulation resistance.
Fig. 3 is the equivalent schematic diagram for clamping meter method for measuring electric power line pole tower insulation resistance.
Fig. 4 is that model is examined and determine in test of the invention.
Fig. 5 is that model wiring diagram is examined and determine in the test of the embodiment of the present invention 1.
Fig. 6 is step flow diagram of the invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.All features disclosed in this specification, or implicit disclosed all methods or in the process the step of, in addition to mutual
Other than the feature and/or step of repulsion, it can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
Specific embodiments of the present invention are described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, is not intended to restrict the invention.In the following description, in order to provide a thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that: this hair need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, well known circuit, software or method are not specifically described.
As shown in Figure 1, a kind of ground resistance measurement method and system, the pincers resistance instrument for quantifying noiseproof feature,
A kind of ground resistance measurement method, comprising:
Step 1 quantifies the noiseproof feature of earth resistance tool, obtains first and compare electric current；
Step 2 measures the Hz noise size of current of object to be tested, obtains second and compares electric current；
Step 3, described in comparison step one first compare second described in electric current and step 2 compared with electric current size,
If described second, which compares electric current, compares electric current no more than described first, earth resistance tool described in step 1 is used
In test ground resistance.
Further, the earth resistance tool includes pincers resistance instrument.
Further, the object to be tested includes the tested cable in electric power line pole tower earth mat.
Further, step 1 is first carried out in advance by the manufacturer of earth resistance tool, is surveyed in the ground resistance
It is provided with anti-Hz noise current characteristics index display device on trial work tool, compares electric current for obtaining first.
A kind of grounding resistance measuring system, comprising:
Quantization device obtains first and compares electric current for quantifying the noiseproof feature of earth resistance tool；
Test device obtains second and compares electric current for measuring the Hz noise size of current of object to be tested；
Multilevel iudge device, it is electric compared with comparing electric current second described in the step 2 for described in comparison step one first
The size of stream, if described second compares electric current and compare electric current no more than described first, by ground resistance described in step 1
Testing tool is for testing ground resistance.
Further, the earth resistance tool includes pincers resistance instrument.
Further, the object to be tested includes the tested cable in electric power line pole tower earth mat.
Further, the quantization device further includes display device, for showing anti-Hz noise current characteristics index.
Further, it if described second compares electric current and compare electric current less than described first, continues to execute Step 1: step
Two tests compare electric current until being satisfied with described second and compare electric current no more than described first, are just used for measurement of Grounding Resistance；?
Under such situation, including replacement earth resistance tool step, compare electric current no more than described until being satisfied with described second
First compares the earth resistance tool of electric current, and the measurement of Grounding Resistance tool is just used for measurement of Grounding Resistance.
A kind of pincers quantifying noiseproof feature hinder instrument, the purposes of noiseproof feature quantizating index, for obtaining described the
One compares electric current.
The two methods that the present invention can be measured by discussing powerline pole tower ground resistance, in research pincerlike meter experiment
On the basis of model is examined and determine in room, and electric power line pole tower is combined to test actual conditions, considers that Hz noise electric current is grounded pincer
The influence of resistance meter pole tower ground resistance measurement to propose the pincerlike meter calibrating model for more meeting field working conditions, and is led to
Cross its technical effect of experimental verification.
The overhead power transmission line pole tower earthing or grounding means that split-core type meter method is directly grounded multistage shaft tower lightning conducter using pincers resistance instrument
The method that ground resistance is tested.It is as shown in Figure 2 that split-core type meter method surveys pole tower ground resistance schematic diagram.By all ground connection of tested shaft tower
Downlead is removed and is shorted together with metal, the test lead as tested earthing or grounding means.By tested earthing or grounding means, ground connection
Test equipment is accessed in the circuit that device shaft tower, lightning conducter, distant place multistage shaft tower and its earthing or grounding means and the earth are formed, generates survey
Electric current is tried, ground resistance Z is measured.Z is greater than and is approximately equal to the ground resistance of tested tower grounding device, this is in tower grounding electricity
It is acceptable in resistance test.
Electric current pole and voltage pole lead need not be arranged when pincers meter method for measuring measurement, does not have to additional power source, as long as hindering instrument with pincers
Overhead line structures ground line or grounding body are clamped, ground resistance can be surveyed.Split-core type meter method pincers meter method for measuring ground resistance be include quilt
The resistance in the entire circuit including pole tower ground resistance is surveyed, mainly tested pole tower ground resistance, down conductor or tower body electricity
Resistance, the contact resistance of aerial earth wire resistance, aerial earth wire and shaft tower, earth resistance of remaining each shaft tower etc..Therefore split-core type meter
Method measurement is it can be found that entire caused by corrosion or poor contact of the entire circuit because of weather soil and certain grounding rods return
The case where road resistance becomes larger.
As shown in figure 3, pincers resistance instrument measurement generally uses the measurement frequency for being higher than 50Hz, to avoid Hz noise.Pincers resistance instrument
It is mainly an a potential winding Ng and current coil Nr in binding clip part.When work, first generated in one by potential winding
Portion voltage e makes to generate a constant voltage E in tested earth-return circuit using electromagnetic induction principle, wherein E=e*Ng.Voltage E exists
Tested earth-return circuit generates induced current, and induced current is flowed out by RX and flowed back to via earth-return circuit from RS earthing pole affluent-dividing
At instrument.Current coil can calculate induced current I value by galvanometer, operational amplifier in table, can by operation
Calculate ground loop resistance RL=E/I=Rx+R0, R0=R1//R2//... //Rn.The principle of pincers resistance instrument is exactly whole circuit Europe
Nurse law, what is measured is the loop resitance of circuit system.When n is sufficiently large, Rx > > R0, for engineering viewpoint can RL can be approximate
For Rx.
From the amplitude-frequency characteristic of earth mat interference signal it can be concluded that Hz noise is main interference in ground connection bill kept on file group test.By
There are electromagnetic couplings between transmission line of electricity phase line and lightning conducter, and induced current IM is generated on lightning conducter and passes through shaft tower or connects
Ground downlead enters ground, interferes to ground resistance measurement.
The Hz noise electric current that measurement circuit is sealed in by Mutual Inductance Coupling, can impact measurement result, so that ground connection
Occasionally there are large errors for the test result of resistance, therefore need to consider influence of the Hz noise electric current to measurement.In Hz noise
In the case that electric current is low, pincerlike ground resistance measuring instrument survey pole tower ground resistance be it is feasible, when Hz noise electric current is higher, meeting
Measurement result is impacted.The calibrating of the regulation error of indication is adopted in JJG1054-2009 " pliers-shape earthing resistance instrument " vertification regulation
With calibration resistor method, schematic diagram is as shown in Figure 1.The calibrating model only considers pole tower ground resistance to the shadow of the measurement error of indication
It rings, does not consider influence of the Hz noise electric current to test result, it is incomplete.Therefore JJG1054-2009 " pincerlike ground resistance
Instrument " it Hz noise electric current should be added in calibration method influences test.
In the present invention, according to the on-site actual situations of pincers resistance instrument measuring staff tower insulation resistance, by Hz noise electric current to pincers
Existing calibrating model is added in the influence for hindering instrument measuring resistance, so that the model of pincers resistance instrument measuring staff tower insulation resistance is more perfect.Bar
The ground resistance and test loop of tower earthing or grounding means there are certain perceptual weight (because lightning conducter and shaft tower there is reactance), because
Inductive component need to be considered when this simulation Hz noise electric current.Laboratory verification equivalent model is as shown in Figure 4.With power frequency interference voltage
Hz noise electric current is generated in test loop, investigates influence of the Hz noise electric current to pincers resistance instrument measurement of Grounding Resistance.
As shown in figure 5, a kind of test calibrating installation of application present invention test calibrating model, is provided with automatic coupling voltage regulator
T1, isolating transformer T2, ammeter, resistance RXAnd pincerlike meter, it is connected according to Fig. 5.In the present embodiment, force can be used in pincers resistance instrument
The KD2572 pincers resistance instrument of Condar Electric Applicance Co., Ltd of Chinese city production, resistance range 0.01 Ω~200 Ω, 0.01 Ω~19.9 Ω amount
Allowable error ± (2%rdg+3dgt), frequency test signal 1.6kHz within the scope of journey.Test connection is as shown in figure 5, with self coupling tune
Depressor T1 output voltage signal generates induced electromotive force, interior electricity by isolating transformer T2 (coiling on transformer core)
Resistance is Rs, internal reactance Xs.Induced electromotive force generates induced current in test loop to simulate live Hz noise electric current, passes through
The size that automatic coupling voltage regulator changes Hz noise electric current is adjusted, and then investigates Hz noise electric current and ground resistance measurement indicating value is missed
The influence of difference.
It " is exchanged according to DL/T 620-1997 " overvoltage and Insulation Coordination of alternating-current electric device " with DL/T 621-1997
The ground connection of electric device " requirement do not have base shaft tower to be not connected to the power frequency earthing resistance of lightning conducter in the route for having lightning conducter,
When Lei Ji is dry, the regulation of table 1 is not to be exceeded.We take 1 Ω, 2 Ω, 5 Ω by the pole tower ground resistance when laboratory test is verified.
The relationship of track section soil resistivity and ground resistance where the measurement of table 1
Validation test step:
1) with the internal resistance Rs and inductance L of the 1kHz shelves measurement isolating transformer T2 of model TH2810B LCR digital electric bridge.
Its internal resistance Rs=0.5518, inductance L=89.1 μ H.
2) Fig. 1 wiring is pressed, standard resistance box sets 1 Ω, is to clamp resistance with the waveform at oscillograph observation caliber resistor both ends
The test signal that instrument issues.
3) Fig. 5 wiring is pressed, calibration resistor Rs sets 1 Ω, 2 Ω, 5 Ω respectively, Hz noise electric current is being not added and power frequency is dry
It disturbs electric current I and sets 0.1A, 0.2A, 0.5A, 0.6A, 0.8A, 1A, 2A respectively, the indicating value Rm of record pincers resistance instrument in table 2.
The pincers resistance instrument of test uses high frequency test signals, frequency 1.58kHz as seen in Figure 4.Then transformer
Reactance Xs=| jwL |=0.8841 Ω, internal resistance Rs=0.5518 Ω,Record measurement circuit
Standard value Zs+Rs, clamp ground resistance expression value Rm, and error of indication Δ is calculated, it inserts in table 2.
The pincers resistance instrument anti-interference test data of table 2
Test result analysis:
The pincers resistance instrument of test uses high frequency test signals, frequency 1.58kHz as seen in Figure 4.Pass through table 2
Data we can see that:
1) as Hz noise electric current < 0.6A, when calibration resistor sets 1 Ω, 2 Ω, 5 Ω, the maximum error of indication is 0.14
Ω.Because KD2572 pincers resistance instrument allowable error in this measurement range is ± (2%rdg+3dgt), then calibration resistor is set respectively
The permission knots modification of measurement result is respectively ± 0.32 Ω, ± 0.34 Ω, ± 0.4 Ω when 1 Ω, 2 Ω, 5 Ω.Therefore work as standard
Resistor sets 1 Ω, 2 Ω, 5 Ω respectively, and when Hz noise electric current≤0.6A, pincers resistance instrument measurement result allows to miss defined
In poor range.
2) as Hz noise electric current >=0.6A, when calibration resistor sets 1 Ω, 2 Ω, 5 Ω, the pincers resistance instrument error of indication is with work
The increase of frequency interference electric current and increase, and beyond pincers resistance instrument allowable error range.As Hz noise current signal > 2A, measurement
As a result serious distortion, institute's measured data cannot function as pole tower ground resistance appraisal standards.The result shows that clamp ground resistance table can be one
Determine anti-Hz noise in degree, but in larger Hz noise, clamp ground resistance table test data is with regard to insincere.
Pincers resistance instrument is due to using higher test frequency, and generally in 100Hz or more, some is even up to several kHz, passes through
The filtering technique of software/hardware filters out the influence of interference.The signal of upper frequency is used when pincers resistance instrument progress earth resistance
To exclude Hz noise, but in the case where there is very big Hz noise electric current on tested cable, measured value also will receive influence,
Cause measurement result inaccurate.So can first determine the anti-interference ability of pincers resistance instrument before testing at the scene, can be provided by producer,
Hz noise electric current on survey line cable again, just can be further when Hz noise electric current is not more than the anti-interference ability of pincerlike meter
Measurement of Grounding Resistance.
Embodiment 1
As shown in figure 5, a kind of test calibrating installation of application present invention test calibrating model, is provided with automatic coupling voltage regulator
T1, isolating transformer T2, ammeter, resistance RXAnd pincerlike meter, it is connected according to Fig. 5；With automatic coupling voltage regulator T1 output voltage signal,
Induced electromotive force, internal resistance Rs, internal reactance Xs are generated by isolating transformer T2 (coiling on transformer core).Sense
It answers electromotive force to generate induced current in test loop to simulate live Hz noise electric current, changes work by adjusting automatic coupling voltage regulator
The size of frequency interference electric current, and then investigate influence of the Hz noise electric current to the ground resistance measurement error of indication.
Remaining technical characteristic in the present embodiment, those skilled in the art can flexibly be selected according to the actual situation
With with to meet different specific actual demands.It will be apparent, however, to one skilled in the art that: it need not use
These specific details carry out the present invention.In other instances, in order to avoid obscuring the present invention, well known method is not specifically described
Or system etc., limited within technical protection scope in the claimed technical solution of claims of the present invention.
Embodiment 2
As shown in fig. 6, a kind of ground resistance measurement method, comprising:
Step 1 quantifies the noiseproof feature of earth resistance tool, obtains first and compare electric current；
Step 2 measures the Hz noise size of current of object to be tested, obtains second and compares electric current；
Step 3, in comparison step one first compare electric current and in step 2 second compared with electric current size, if second
Compare electric current and compare electric current no more than first, is then used for earth resistance tool in step 1 to test ground resistance.
It, optionally, can be by directly measuring the size of interference electric current with clamp ammeter, to get in step 1
First compares electric current.
Remaining technical characteristic in the present embodiment, those skilled in the art can flexibly be selected according to the actual situation
With with to meet different specific actual demands.It will be apparent, however, to one skilled in the art that: it need not use
These specific details carry out the present invention.In other instances, in order to avoid obscuring the present invention, well known method is not specifically described
Or system etc., limited within technical protection scope in the claimed technical solution of claims of the present invention.
Embodiment 3
A kind of grounding resistance measuring system, comprising:
Quantization device obtains first and compares electric current for quantifying the noiseproof feature of earth resistance tool；
Test device obtains second and compares electric current for measuring the Hz noise size of current of object to be tested；
Multilevel iudge device, electric current is big compared with comparing electric current and in step 2 second in comparison step one first
It is small, if second compares electric current and compare electric current no more than first, earth resistance tool in step 1 is used to test connecing
Ground resistance.
Remaining technical characteristic in the present embodiment, those skilled in the art can flexibly be selected according to the actual situation
With with to meet different specific actual demands.It will be apparent, however, to one skilled in the art that: it need not use
These specific details carry out the present invention.In other instances, in order to avoid obscuring the present invention, well known method is not specifically described
Or system etc., limited within technical protection scope in the claimed technical solution of claims of the present invention.
Embodiment 4
It is a kind of quantify noiseproof feature pincers hinder instrument, the pincers resistance instrument factory when, be provided with noiseproof feature quantizating index
Parameter, the purposes of these parameters is to be capable of providing a quantization noiseproof feature parameter for comparing, used in ground resistance
Test calibrating tool in, as first comparison electric current, purposes be as judge earth resistance tool whether meet and
The comparison reference electric current of measurand.
Remaining technical characteristic in the present embodiment, those skilled in the art can flexibly be selected according to the actual situation
With with to meet different specific actual demands.It will be apparent, however, to one skilled in the art that: it need not use
These specific details carry out the present invention.In other instances, in order to avoid obscuring the present invention, well known method is not specifically described
Or system etc., limited within technical protection scope in the claimed technical solution of claims of the present invention.
For the aforementioned method embodiment, for simple description, therefore, it is stated as a series of action combinations, still
Those skilled in the art should understand that the application is not limited by the described action sequence, because according to the application, it is a certain
A little steps can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know that, it is retouched in specification
The embodiment stated belongs to preferred embodiment, necessary to related movement and unit not necessarily the application.
It will be appreciated by those of skill in the art that unit described in conjunction with the examples disclosed in the embodiments of the present disclosure and
Algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually with hard
Part or software mode execute, the specific application and design constraint depending on technical solution.Professional technician can be with
Each specific application is come to realize described function using distinct methods, but this realization should not exceed model of the invention
It encloses.
Disclosed system, module and method, may be implemented in other ways.For example, device described above
Embodiment, only schematically, for example, the division of the unit, can be only a kind of logical function partition, it is practical to realize
When there may be another division manner, such as multiple units or components can be combined or can be integrated into another system, or
Some features can be ignored or not executed.Another point, shown or discussed mutual coupling or direct-coupling or communication
Connection is it may be said that through some interfaces, the indirect coupling or communication connection of device or unit can be electrical property, mechanical or other
Form.
The unit that the discrete parts illustrates can be or can not also receive and is physically separated, shown as a unit
Component can be or can not receive physical unit, it can and it is in one place, or may be distributed over multiple network lists
In member.It can select some or all of unit therein according to the actual needs to realize the purpose of the scheme of the present embodiment.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially right in other words
The part of part or the technical solution that the prior art contributes can be embodied in the form of software products, the calculating
Machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be individual
Computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.And
Storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory
The various media that can store program code such as device (Random Access Memory, RAM), magnetic or disk.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in the method for above-described embodiment, being can
It is completed with instructing relevant hardware by computer program, the program can be stored in computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, ROM, RAM etc..
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (10)
1. a kind of ground resistance measurement method characterized by comprising
Step 1 quantifies the noiseproof feature of earth resistance tool, obtains first and compare electric current；
Step 2 measures the Hz noise size of current of object to be tested, obtains second and compares electric current；
Step 3, described in comparison step one first compare second described in electric current and step 2 compared with electric current size, if
Described second, which compares electric current, compares electric current no more than described first, then is used to survey by earth resistance tool described in step 1
It tries ground resistance.
2. the method according to claim 1, wherein the earth resistance tool includes pincers resistance instrument.
3. method according to claim 1 or 2, which is characterized in that the object to be tested includes electric power line pole tower
Tested cable in net.
4. according to the method described in claim 3, it is characterized in that, step 1 is pre- by the manufacturer of earth resistance tool
It first carries out, anti-Hz noise current characteristics index display device is provided on the earth resistance tool, for obtaining
First compares electric current.
5. a kind of grounding resistance measuring system characterized by comprising
Quantization device obtains first and compares electric current for quantifying the noiseproof feature of earth resistance tool；
Test device obtains second and compares electric current for measuring the Hz noise size of current of object to be tested；
Multilevel iudge device, electric current compared with comparing second described in electric current and step 2 for described in comparison step one first
Size, if described second compares electric current and compare electric current no more than described first, by earth resistance described in step 1
Tool is for testing ground resistance.
6. system according to claim 5, which is characterized in that the earth resistance tool includes pincers resistance instrument.
7. system according to claim 5 or 6, which is characterized in that the object to be tested includes electric power line pole tower
Tested cable in net.
8. system according to claim 7, which is characterized in that the quantization device further includes display device, for showing
Anti- Hz noise current characteristics index.
9. system according to claim 1 or 5, which is characterized in that if described second compares electric current less than described first
Compare electric current, continues to execute Step 1: step 2 test, compares electric current no more than first ratio until being satisfied with described second
Compared with electric current, it to be just used for measurement of Grounding Resistance；In which case, including earth resistance tool step is replaced, until meeting
Compare electric current in described second and be not more than the described first earth resistance tool for comparing electric current, just by the measurement of Grounding Resistance
Tool is used for measurement of Grounding Resistance.
10. a kind of pincers for quantifying noiseproof feature hinder instrument, which is characterized in that the purposes of its noiseproof feature quantizating index is to be used for
It obtains described first and compares electric current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811268877.3A CN109283396A (en) | 2018-10-29 | 2018-10-29 | Ground resistance measurement method and system, the pincers resistance instrument for quantifying noiseproof feature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811268877.3A CN109283396A (en) | 2018-10-29 | 2018-10-29 | Ground resistance measurement method and system, the pincers resistance instrument for quantifying noiseproof feature |
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| CN110057872A (en) * | 2019-05-14 | 2019-07-26 | 重庆交通大学 | A kind of cable fracture of wire monitoring method based on detection self inductance effect inductance |
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