CN106841815A - A kind of power line steel tower earth resistance In-circiut tester based on voltage drive - Google Patents
A kind of power line steel tower earth resistance In-circiut tester based on voltage drive Download PDFInfo
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- CN106841815A CN106841815A CN201710191596.1A CN201710191596A CN106841815A CN 106841815 A CN106841815 A CN 106841815A CN 201710191596 A CN201710191596 A CN 201710191596A CN 106841815 A CN106841815 A CN 106841815A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000005070 sampling Methods 0.000 claims abstract description 73
- 239000004020 conductor Substances 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 230000005284 excitation Effects 0.000 claims description 53
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
- 238000007689 inspection Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 230000035611 feeding Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004936 stimulating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
-
- 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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Abstract
The invention discloses a kind of power line steel tower earth resistance In-circiut tester based on voltage drive, earth resistance tester, earth resistance tester is including Tourniquet clamping head driver unit, without chuck driver unit, electric current sender electrode, voltage sampling electrode and signal processing circuit board, a set of Tourniquet clamping head driver unit is installed on a piece down conductor of power line steel tower, respectively installs a set of without chuck driver unit on remaining down conductor.On-line measurement function of the present invention allows the data of power line steel tower earth resistance directly to be uploaded by way of Internet of Things, realize network monitoring, effectively substitute the manual inspection mode of electric power tower, it is greatly enhanced the efficiency of detection, in addition, key parameter is obtained by contact measurement, the precision of test is ensure that, difficulty and cost in production is greatly reduced.
Description
Technical field
The present invention relates to the earth resistance technology of power line steel tower, more particularly to a kind of electric power based on voltage drive
Line steel tower earth resistance In-circiut tester.
Background technology
It is well known that to ensure ultra-high-tension power transmission line safe and stable operation, reducing the harm that thunderbolt brings, high voltage power transmission iron
Tower is all equipped with ground networks.It is to improve earthing effect, in addition to single steel tower ground networks of itself, will also be each by trolley line
Steel tower is sequentially communicated, and by single steel tower, itself earth mat flows into the earth to earth current, and the ground of neighbouring an iron rake with three to six teeth is passed through also by trolley line
Net flows into the earth.Obviously, the earth resistance of each steel tower is required for control within the specific limits.Currently employed steel tower ground connection
Resistance measurement mode mainly has two kinds, and a kind of is to disconnect the down conductor of steel tower, using mechanical megger formula or electronically
Resistance instrument is measured by trilinear method, and another kind is the pincerlike meter measurement for occurring in recent years, and the problem measured using existing trilinear method is
Down conductor is have to be off, causes manually to participate in, make detection efficiency low, each steel tower can only detect limited every year
Several times, the measurement of pincerlike meter assumes that the parallel resistance of other steel towers is minimum, and this assumes not tally with the actual situation, meanwhile,
Its metering system steel tower have double down conductors even many down conductors when, due to the influence of downlead itself, it is impossible to enter
Row measurement.
The earth mat resistance of each steel tower is monitored using Internet of Things, the work side of conventional that manual inspection can be substituted
Formula, is greatly enhanced detection efficiency, frequency and flexibility, is a kind of demand of reality, but must first solve artificial participation
Problem, and it is exactly most important premise not turn off down conductor.
Steel tower earth resistance can be just measured for solution does not turn off down conductor, existing patent proposes the base in trilinear method
By increasing the method that inspection streamline circle measures the electric current of each downlead on plinth, say it is feasible in principle, but this measuring method
It is required that inspection streamline circle needs precision very high when electric current is measured, thus it is comparatively more complicated on the implementation.Meanwhile, tradition
Ground resistance meter cannot accurately test the problem of electric power tower earth resistance under the conditions of downlead is not turned off.
The content of the invention
The technical problem to be solved in the present invention is the defect for overcoming prior art, there is provided a kind of electric power based on voltage drive
Line steel tower earth resistance In-circiut tester.
In order to solve the above-mentioned technical problem, the invention provides following technical scheme：
A kind of power line steel tower earth resistance In-circiut tester based on voltage drive of the present invention, including earth resistance
Instrument, the earth resistance tester is including Tourniquet clamping head driver unit, without chuck driver unit, electric current sender electrode, voltage sampling
Electrode and signal processing circuit board, the Tourniquet clamping head driver unit from top to bottom comprising it is upper sampling chuck, excitation coil and under take
Sample chuck, and on a down conductor of power line steel tower, the excitation coil and down conductor noncontact, institute
State sampling chuck and lower sampling chuck is fastenedly connected with down conductor, it is described then only to include one without chuck driver unit
Excitation coil, and on the other down conductor of power line steel tower, and down conductor noncontact, under double grounding leads
The situation of line, it is only necessary to one without chuck driver unit, to the situation of many down conductors, then except being provided with chuck driver unit
That root down conductor outside, remaining each down conductor is both needed to install one without chuck driver unit, the electric current hair
Sending electrode and voltage sampling electrode determine that distance is inserted into certain depth in ground according to conventional three-wire method earthing test standard, single
Test under individual sine wave freuqency is divided into two stages, in the first stage, is tested connecting line between steel tower, other steel towers and tower and constitutes
One electric loop, contains two resistance in loop model, one is the earth resistance Rg of tested steel tower, and another is by removing
The equivalent resistance Rt that other steel towers and trolley line outside tested steel tower are constituted, this stage current sender electrode disconnects and not working,
Excitation coil in the Tourniquet clamping head driver unit and inspired in the loop without the excitation coil in chuck driver unit electronic
Gesture, now, upper sampling chuck is connected with the ground of signal-processing board, and the voltage signal that the lower sampling chuck is taken out is
The electromotive force that coil excitation goes out, and the voltage that voltage sampling electrode is taken out is then the pressure drop on tested steel tower earth resistance, this
Two paths of signals feeding signal-processing board is processed, and can obtain two ratios of resistance Rg, Rt, second-order in loop model
Section, the excitation coil and upper sampling chuck disconnect and not working, the electric current sender electrode, voltage sampling electrode, under take
Sample chuck is connected, and resistance Rg, Rt constitute parallel connection in this stage, and measured resistance is two parallel value Ra of resistance Rg, Rt, this
Afterwards, it is anti-in order to improve using two connection in series-parallel relations in stage, it is possible to calculate a grounding resistance Rg of tested steel tower
The ability of interference, above-mentioned test process is repeated using multiple random frequencies, a series of grounding resistance is obtained, by Statistics Division
Reason, provides an optimal testing result, as the measurement output valve of tested steel tower earth resistance.
Swashing in as a preferred technical solution of the present invention, the Tourniquet clamping head driver unit and without chuck driver unit
Coil is encouraged, the multi-turn enamel-covered wire wound by iron core and outside is collectively formed, the Tourniquet clamping head driver unit and without chuck excitation
Part is made up of two independences and identical semicolumn part.
Swashing in as a preferred technical solution of the present invention, the Tourniquet clamping head driver unit and without chuck driver unit
Encourage coil, parameter also requires that as identical as possible, and each excitation coil is driven using same driving source.
Used as a preferred technical solution of the present invention, the drive voltage signal of the excitation coil is sine wave signal,
The signal is provided by signal processing circuit board, can in the loop inspire the electromotive force of sine wave.
As a preferred technical solution of the present invention, signal frequency is randomly provided in bandpass filter passband, multiple is not
The treatment of same flow obtains a resistance value sequence under same frequency sine wave signal, then carries out statistical disposition.
Operation principle of the invention is：Power line steel tower is due to the presence of trolley line so that under tested steel tower grounding lead
When line is not turned off, one is equivalent to containing two circuit loops of resistance, a resistance is the earth resistance Rg of tested steel tower, separately
One is remaining steel tower and an equivalent resistance Rt of trolley line collective effect generation in addition to tested steel tower, is existed using excitation coil
Electromotive force is inspired in the loop, the suitable voltage measurement point of reselection can measure the ratio ρ of the two resistance Rt, Rg,
When only turning on electric current sender electrode, lower sampling chuck and voltage sampling electrode, lower sampling chuck meets a sample resistance Rs to letter
Publicly, electric current sender electrode sends electric current, on the voltage and sample resistance on voltage sampling electrode for number process circuit plate
The ratio of voltage, representative is Rt | | the ratio of Rg+Rs and Rs；Obtaining two ratios and two parallel connection electricity of resistance of resistance
After resistance, the ground networks resistance value Rg for obtaining tested steel tower can be resolved；By the test under the conditions of multiple random frequencies, can
To obtain a series of computing the resistor value result, statistical disposition algorithm is used to these results, provide a valuation for optimization, so
Doing can improve antijamming capability；Test process under each frequency is divided into two stages, first stage, signal transacting
Device control relay, connects excitation coil, upper sampling chuck, lower sampling chuck, voltage sampling electrode, and remaining wiring disconnects,
This sample chuck and signal processing circuit board at present publicly between without sample resistance Rs, upper sampling chuck and signal processing circuit
The ground of plate is connected, and uses sine wave drive excitation coil, and power taking pressure signal is distinguished from lower sampling chuck and voltage sampling electrode
Vd, vp1, by bandpass filtering and A/D conversion feeding signal processor in, treatment obtain two ratio ρ=Rt/Rg=of resistance
(vd-vp1)/vp1, second stage, signal processor control relay, make electric current sender electrode, voltage sampling electrode and under
Sampling chuck is connected, and remaining wiring disconnects, and this samples chuck and is connected to a sample resistance Rs to signal processing circuit board at present
Publicly, sine wave sends through signal code sender electrode, from pick-up voltage signal on voltage sampling electrode and sample resistance Rs
Vp2, vs, by the first stage, same bandpass filter and A/D change circuit feeding signal processor, are calculated two resistance
Resistance in parallel turns Ra=Rt | | Rg=Rs (vp2/vs-1)；Based on connection in series-parallel relation, the earth resistance of tested steel tower is obtained
Rg=Ra × (1+1/ ρ)；Wherein one downlead of steel tower installs a Tourniquet clamping head driver unit, and remaining downlead is respectively installed
One without chuck driver unit, the excitation coil in these driver units, using the driving of same driving source, and each excitation coil
Parameter it is as consistent as possible, it is hereby ensured that it is lower sampling chuck at current potential be connected at the tie point of ground networks with downlead
The difference of current potential can be ignored, and the current potential at upper sampling chuck can be ignored with the potential difference of steel tower.
Compared with prior art, beneficial effects of the present invention are as follows：
1. on-line measurement function of the present invention allows the data of power line steel tower earth resistance straight by way of Internet of Things
Connect biography, realize network monitoring, effectively substitute the manual inspection mode of electric power tower, be greatly enhanced efficiency, the frequency of detection
And flexibility ratio, the earth resistance of power line steel tower is monitored more convenient reliability.
2. the present invention determines the resistance of resistance ratio and resistor coupled in parallel by measuring voltage ratio, and key parameter all passes through
Contact measurement is obtained, it is ensured that the precision of test, and the electromotive force size for being motivated to excitation coil in theory is not fixed
The requirement of amount, as long as having certain amplitude just to meet tests needs, therefore implements simpler reliability, greatly reduces
Difficulty and cost in production.
3. repeatedly measured under the conditions of multiple random frequencies with same flow, obtain multiple earth resistance measuring and calculating values, be used in combination
Statistic algorithm obtains an optimal estimate, and this mode can further improve jamproof ability, even if there is multiple iron
Tower is measured at the same time, it is also possible to obtain the accurate earth resistance result of tested steel tower, be ensure that on test philosophy
No longer need that down conductor and steel tower are disconnected and could be measured, reached direct-on-line test ground networks resistance value size
Purpose.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, with reality of the invention
Applying example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is test wiring schematic diagram of the invention；
Fig. 2 is measuring loop equivalent resistance schematic diagram of the invention；
Fig. 3 is the signal flow schematic diagram of coil stimulating stage test of the invention；
Fig. 4 is the signal flow schematic diagram of coil excitation phase test of the invention；
In figure：1st, earth resistance tester；2nd, Tourniquet clamping head driver unit；3rd, without chuck driver unit；4th, electric current sends electricity
Pole；5th, voltage sampling electrode；6th, signal processing circuit board；7th, upper sampling chuck；8th, excitation coil；9th, lower sampling chuck；10th, band
Bandpass filter.
Specific embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that preferred reality described herein
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment 1
As Figure 1-4, the present invention provides a kind of power line steel tower earth resistance In-circiut tester based on voltage drive,
Including earth resistance tester 1, earth resistance tester 1 includes Tourniquet clamping head driver unit 2, is sent out without chuck driver unit 3, electric current
Sending electrode 4, voltage sampling electrode 5 and signal processing circuit board 6, Tourniquet clamping head driver unit 2 include upper sampling chuck from top to bottom
7th, excitation coil 8 and lower sampling chuck 9, and on a down conductor of power line steel tower, excitation coil 8 and ground connection
Downlead noncontact, upper sampling chuck 7 and lower sampling chuck 9 are fastenedly connected with down conductor, without chuck driver unit 3 then
An excitation coil 8 is only included, and on the other down conductor of power line steel tower, and down conductor noncontact,
To the situation of double down conductors, it is only necessary to one without chuck driver unit 3, to the situation of many down conductors, then except being provided with
Outside that root down conductor of Tourniquet clamping head driver unit 2, remaining each down conductor is both needed to install one without chuck excitation
Part 3, electric current sender electrode 4 and voltage sampling electrode 5 determine that distance is inserted into according to conventional three-wire method earthing test standard
Certain depth in ground, the test under single sine wave freuqency is divided into two stages, in the first stage, is tested steel tower, other steel towers
And trolley line constitutes an electric loop, two resistance are contained in loop model, one is the earth resistance Rg of tested steel tower,
Another is the equivalent resistance Rt being made up of other steel towers and trolley line in addition to tested steel tower, this stage current sender electrode 4
Disconnection does not work, excitation coil 8 in Tourniquet clamping head driver unit 2 and without the excitation coil 8 in chuck driver unit 3 in loop
In inspire electromotive force, now, upper sampling chuck 7 is connected with the ground of signal-processing board 6, the lower chuck 9 of sampling is taken out
Voltage signal is the electromotive force that coil excitation goes out, and the voltage that voltage sampling electrode 5 is taken out is then tested steel tower ground connection electricity
Pressure drop in resistance, this two paths of signals feeding signal-processing board 6 is processed, and can obtain two resistance Rg, Rt in loop model
Ratio, second stage, excitation coil 8 and upper sampling chuck 7 disconnect and do not work, and electric current sender electrode 4, voltage sampling is electric
Pole 5, lower sampling chuck 9 are connected, resistance Rg, Rt constituted in this stage it is in parallel, measured resistance be two resistance Rg, Rt and
Connection value Ra, hereafter, using two connection in series-parallel relations in stage, it is possible to calculate a grounding resistance Rg of tested steel tower,
In order to improve jamproof ability, above-mentioned test process is repeated using multiple random frequencies, obtains a series of grounding resistance,
By statistical disposition, an optimal testing result is provided, as the measurement output valve of tested steel tower earth resistance.
Tourniquet clamping head driver unit 2 and without the excitation coil 8 in chuck driver unit 3, by iron core and outside wind it is many
Circle enamel-covered wire is collectively formed, Tourniquet clamping head driver unit 2 and be in structure independent and identical by two without chuck driver unit 3
Semicolumn part constitute, a complete component is tightened to after being installed on down conductor, play one and complete swash
Encourage the same function of part.
Tourniquet clamping head driver unit 2 and without the excitation coil 8 in chuck driver unit 3, parameter also require that it is as identical as possible, respectively
Individual excitation coil 8 is driven using same driving source.
The drive voltage signal of excitation coil 8 is sine wave signal, and the signal is provided by signal processing circuit board 6, can
The electromotive force of sine wave is inspired in the loop, can effectively improve jamproof ability.
Signal frequency is randomly provided in the passband of bandpass filter 10, same flow under multiple different frequency sine wave signals
Treatment obtains a resistance value sequence, then carries out statistical disposition.
Specifically, as shown in Figure 1：Tourniquet clamping head driver unit 2 is respectively mounted on two down conductors and is swashed without chuck
Part 3 is encouraged, notices that installation direction does not turn-over, the mode of connection insertion electric current sender electrode 4 further according to traditional ground resistance meter is (right
Induced current pole C) and voltage sampling electrode 5 (corresponding voltage pole P).Tourniquet clamping head driver unit 2, without chuck driver unit 3, electric current hair
Sending electrode 4 and voltage sampling electrode 5 is all leaded is connected with tester main frame by connector, signal processing circuit board 6 is pacified
In tester main frame.Tourniquet clamping head driver unit 2 and the parameter without the excitation coil 8 in chuck driver unit 3 will be as far as possible
Unanimously.Tourniquet clamping head driver unit 2 and be all independent part without chuck driver unit 3, except crucial upper sampling chuck 7, excitation
Outside coil 8, sampling chuck and lead-out wire, part that should also be attached including fastening, waterproof etc. is facilitated reliably simultaneously with ensuring to install
Being capable of long-term use in the wild.
As shown in Figure 2：One resistance is tested steel tower earth resistance Rg, another for remaining steel tower earth resistance and
The equivalent resistance Rt of the compositions such as trolley line.After upper sampling chuck 7 is connected with the ground of signal processing circuit board 6, with excitation
Coil 8 motivates electromotive force in the loop, similar to adding a voltage source, the electricity on two resistance Rg, Rt in the loop
Pressure ratio value is equal with the ratio of two resistance.If cancel the effect of excitation coil 8 and upper voltage sampling electrode 5, and by electric current
Sender electrode 4 sends electric current, from the lower chuck 9 that samples by returning to the ground of signal processing circuit board 6 after a sample resistance Rs, this
When both of the aforesaid resistance Rg, Rt parallel relationship is in new loop, by the voltage vs on sample resistance Rs and from voltage
The ratio of the voltage vp2 that sampling electrode 5 is taken, can be calculated two resistance Rg, Rt resistance Ra=Rt in parallel | | Rg.Utilize
Resistance value ratio and resistance in parallel that above-mentioned two situations are obtained, with reference to connection in series-parallel relation, can converse the ground connection electricity of tested steel tower
Resistance Rg=Ra × (1+1/ ρ).
As shown in Figure 3：Now loop model be resistance Rg, Rt series connection, excitation coil 8 produce in the loop one it is electronic
Gesture.It it is the coil stimulating stage into the first stage so that FPGA makees signal processing chip as an example, FPGA control relays make excitation line
Circle 8, upper sampling chuck 7, lower sampling chuck 9, the circuit of voltage sampling electrode 5 are connected, and remaining line disconnects, now upper sampling chuck
7 connect with the ground of signal processing circuit board 6；After connecting stabilization, FPGA produces a sinusoidal wave data sequence, is changed by D/A
Circuit output sine wave, the frequency of the sine wave has randomness, but in bandpass filter flat gain area；After conversion
Sine wave provides the sine waveform of sufficiently large electric current and intimate standard through overdrive circuit again, while driving Tourniquet clamping head excitation
Part 2 and without the excitation coil 8 in chuck driver unit 3；The voltage that will be got at voltage sampling electrode 5 believes No. vp1 by one
Sent into after road bandpass filtering and all the way A/D conversions in FPGA, the voltage signal vd that will be got at lower voltage sampling electrode 5 passes through
After another road bandpass filtering and another road A/D conversions in feeding FPGA；FPGA is solved using Fourier Transform Algorithm, and conversion is obtained
The two ratio ρ of resistance Rg, Rt=Rt/Rg=(vd-vp1)/vp1 in loop model.
As shown in Figure 4：Now loop model is resistance Rg, Rt in parallel.It is coil excitation phase into second stage,
FPGA control relays make lower sampling chuck 9, electric current sender electrode 4 be connected with the line of voltage sampling electrode 5, and remaining wiring is broken
Open, this samples chuck 9 and has met a sample resistance Rs to the ground of signal processing circuit board 6 at present；After relay is connected, FPGA is still
Produce sine wave signal with same circuit, the signal by electric current sender electrode 4 to the earth, by ground resistance network Rg and equivalent
Return to the ground of signal processing circuit board 6 after resistance Rt by sample resistance Rs again by lower sampling chuck 9, now resistance Rg, Rt
Constitute parallel-connection structure；The voltage signal vp2 that voltage sampling electrode 5 is obtained sends into FPGA after being changed through bandpass filtering and A/D, will
Voltage signal vs on sample resistance Rs sends into FPGA after being changed through another road bandpass filtering and A/D；The two of FPGA treatment feedings
Road signal, conversion obtains the value Ra=Rt of parallel resistance | | Rg=Rs (vp2/vs-1).After the completion of the test of two stages, by the
The value Ra=Rt of the parallel resistance that the ratio ρ of two resistance that one stage was calculated=Rt/Rg and second stage is obtained | | Rg,
Using connection in series-parallel relation, resolving obtains measured value Rg=Ra × (a 1+1/ ρ) of tested steel tower ground resistance.
Change sine wave freuqency and remake above-mentioned same measurement, flow is identical, and only sine wave freuqency changes at random,
The data that FPGA is input into according to A/D randomly produce a new sinusoidal wave data sequence, its frequency to still need to be limited to foregoing model
Within enclosing, a new measured value of tested steel tower ground resistance is obtained according to aforementioned process；Tested steel tower ground can and so on be obtained
One sequence sets of resistance, the resistance value of tested steel tower final output is obtained by statistical disposition mode.
The measuring circuit in two stages in measuring above is one, is only reached by Control break-make each
Circuit function.When not measuring, each relay is all to disconnect, and circuit board disconnects with all aerial lugs, in relay
Piezo-resistance is added to carry out further protection circuit plate afterwards.
Signal processor can use FPGA, it would however also be possible to employ the chip such as single-chip microcomputer, DSP, no matter using any chip,
Require that can complete Fourier transformation, the calculating of resistance value and statistical method obtains final resistance calculations result.
In addition, being arranged on parameter phase in each driver unit on down conductor with sine-wave excitation by same driving source
Same excitation coil 8, then by upper sampling chuck 7, lower sampling chuck 9 and the cooperation test loop model of voltage sampling electrode 5
Ratio ρ=the Rt/Rg of resistance, with the use of electric current sender electrode 4, voltage sampling electrode 5, lower sampling chuck 9 and sample resistance
Measure two resistance Ra=Rt in parallel of resistance in loop | | Rg, solved using connection in series-parallel relation and obtain an electricity for tested steel tower
Resistance Rg.
1. on-line measurement function of the present invention allows the data of power line steel tower earth resistance straight by way of Internet of Things
Connect biography, realize network monitoring, effectively substitute the manual inspection mode of electric power tower, be greatly enhanced efficiency, the frequency of detection
And flexibility ratio, the earth resistance of power line steel tower is monitored more convenient reliability.
2. the present invention determines the resistance of resistance ratio and resistor coupled in parallel by measuring voltage ratio, and key parameter all passes through
Contact measurement is obtained, it is ensured that the precision of test, and the electromotive force size for being motivated to excitation coil in theory is not fixed
The requirement of amount, as long as having certain amplitude just to meet tests needs, therefore implements simpler reliability, greatly reduces
Difficulty and cost in production.
3. repeatedly measured under the conditions of multiple random frequencies with same flow, obtain multiple earth resistance measuring and calculating values, be used in combination
Statistic algorithm obtains an optimal estimate, and this mode can further improve jamproof ability, even if there is multiple iron
Tower is measured at the same time, it is also possible to obtain the accurate earth resistance result of tested steel tower, be ensure that on test philosophy
No longer need that down conductor and steel tower are disconnected and could be measured, reached direct-on-line test ground networks resistance value size
Purpose.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although being described in detail to the present invention with reference to the foregoing embodiments, for a person skilled in the art, it still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention
Within protection domain.
Claims (5)
1. a kind of power line steel tower earth resistance In-circiut tester based on voltage drive, including earth resistance tester (1), its
It is characterised by, the earth resistance tester (1) is sent out including Tourniquet clamping head driver unit (2), without chuck driver unit (3), electric current
Sending electrode (4), voltage sampling electrode (5) and signal processing circuit board (6), the Tourniquet clamping head driver unit (2) are wrapped from top to bottom
Containing upper sampling chuck (7), excitation coil (8) and lower sampling chuck (9), and installed in a down conductor of power line steel tower
On, the excitation coil (8) and down conductor noncontact, upper sampling chuck (7) and it is lower sample chuck (9) with ground connection
Downlead is fastenedly connected, described then only to include an excitation coil (8) without chuck driver unit (3), and installed in power line iron
On the other down conductor of tower, and down conductor noncontact, to the situation of double down conductors, it is only necessary to which is swashed without chuck
Part (3) is encouraged, to the situation of many down conductors, then in addition to that root down conductor for being provided with chuck driver unit (2),
Remaining each down conductor is both needed to install one without chuck driver unit (3), and the electric current sender electrode (4) and voltage take
Sample electrode (5) determines that distance is inserted into certain depth, single sinusoidal wave frequency in ground according to conventional three-wire method earthing test standard
Test under rate is divided into two stages, in the first stage, is tested connecting line composition one between steel tower, other steel towers and tower and electrically returns
Road, contains two resistance in loop model, one is the earth resistance Rg of tested steel tower, and another is by addition to tested steel tower
Other steel towers and trolley line constitute equivalent resistance Rt, this stage current sender electrode (4) disconnect do not work, it is described band folder
Excitation coil (8) in head driver unit (2) and inspired in the loop without the excitation coil (8) in chuck driver unit (3)
Electromotive force, now, upper sampling chuck (7) is connected with the ground of signal-processing board (6), and lower sampling chuck (9) is taken out
Voltage signal be the electromotive force that coil excitation goes out, and the voltage that voltage sampling electrode (5) is taken out is then for tested steel tower connects
The ohmically pressure drop in ground, this two paths of signals is sent into signal-processing board (6) and is processed, and can obtain two resistance in loop model
The ratio of Rg, Rt, second stage, the excitation coil (8) and upper sampling chuck (7) disconnect and not working, the electric current hair
Sending electrode (4), voltage sampling electrode (5), lower sampling chuck (9) connection, resistance Rg, Rt constitute parallel connection in this stage, measured
Resistance be two parallel value Ra of resistance Rg, Rt, hereafter, using two connection in series-parallel relations in stage, it is possible to calculate by
A grounding resistance Rg of steel tower is surveyed, in order to improve jamproof ability, above-mentioned test is repeated using multiple random frequencies
Journey, obtains a series of grounding resistance, by statistical disposition, provides an optimal testing result, is connect as tested steel tower
The measurement output valve of ground resistance.
2. a kind of power line steel tower earth resistance In-circiut tester based on voltage drive according to claim 1, it is special
Levy and be, the Tourniquet clamping head driver unit (2) and without the excitation coil (8) in chuck driver unit (3), by iron core and outside
The multi-turn enamel-covered wire of winding is collectively formed, and the Tourniquet clamping head driver unit (2) and without chuck driver unit (3) is in structure
It is made up of two independences and identical semicolumn part.
3. a kind of power line steel tower earth resistance In-circiut tester based on voltage drive according to claim 2, it is special
Levy and be, the Tourniquet clamping head driver unit (2) and without the excitation coil (8) in chuck driver unit (3), parameter is also required that to the greatest extent may be used
Can be identical, each excitation coil (8) is driven using same driving source.
4. a kind of power line steel tower earth resistance In-circiut tester based on voltage drive according to claim 3, it is special
Levy and be, the drive voltage signal of the excitation coil (8) is sine wave signal, and the signal is carried by signal processing circuit board (6)
For can in the loop inspire the electromotive force of sine wave.
5. a kind of power line steel tower earth resistance In-circiut tester based on voltage drive according to claim 1, it is special
Levy and be, signal frequency is randomly provided in bandpass filter (10) passband, same flow under multiple different frequency sine wave signals
Treatment obtain a resistance value sequence, then carry out statistical disposition.
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| CN112254766B (en) * | 2020-10-19 | 2022-02-08 | 三峡大学 | Iron tower stress and vibration detection device |
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