CN205003237U - Device that screening of guide body line defect detected on ground net - Google Patents
Device that screening of guide body line defect detected on ground net Download PDFInfo
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- CN205003237U CN205003237U CN201520785962.2U CN201520785962U CN205003237U CN 205003237 U CN205003237 U CN 205003237U CN 201520785962 U CN201520785962 U CN 201520785962U CN 205003237 U CN205003237 U CN 205003237U
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- 230000007547 defect Effects 0.000 title claims abstract description 39
- 238000012216 screening Methods 0.000 title abstract 2
- 238000002847 impedance measurement Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 9
- 238000013481 data capture Methods 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000013519 translation Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 5
- 201000004569 Blindness Diseases 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010205 computational analysis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of electric power system precision measurement and analysis and detection, concretely relates to device that screening of guide body line defect detected on ground net. The utility model discloses the method of mainly having solved the defect of guide body line on the current detection ground net exists that blindness is big, work load big, the judged result reliability is poor and detect technical problem with high costs. The utility model discloses an actual measurement selects guide body line in the suspicious defect, again with by through strict theoretical calculate with the ground net just often the precision measurement impedance threshold value set for relatively, guide body line defect sureness in has solved the technological problem that the department was examined to electric power system fortune, provides one and has been directed against the defect detecting method and apparatus for that guides the line of personally experiencing sth. Part of the body on the ground net specially. The utility model has the advantages of easy and simple to handle, testing result reliability height and detection efficiency are high.
Description
Technical field
The utility model belongs to electric system and accurately measures and technical field of analysis and detection, is specifically related to the device of guide body line defect selective mechanisms in a kind of grounded screen.
Background technology
The transformer of generating plant and transformer station, mutual inductor, the power system devices such as reactor are all connected with grounded screen by upper guide body line, on these, guide body line plays a very important role in safe operation of power system, they are paths that equipment is connected with grounded screen, by these lead-in wires, various electrical equipments for whole electric system provide a public grounded screen with reference to meet need of work, when system is short-circuited or be struck by lightning, drain fault current rapidly by these lead-in wires and reduce the earth potential liter of protected area, in protection perform region, the personal safety of technical work personnel and the safety of various electrical equipment are run with normal.
A upper guide body line part for grounded screen exposes in atmosphere, a part imbeds underground, usually utilize the material such as band steel or round steel by welding mode and grounded screen be connected as a single entity, grounded screen generally imbeds the degree of depth that underground is less than 1 meter, plays fault current of releasing, all presses and reduce the effect of impedance ground.Guide body line on ground connection is had to be connected with the electrical equipment on ground at grounded screen diverse location place as required.When electric system be short-circuited or to be struck by lightning etc. fault time, the big current of moment is dispensed into ground through upper guide body line and grounded screen, thus plays the effect to equipment and worker safety's protection.But the grounding body of steel material is along with the increase running the time limit, because of failure welding, there is the reasons such as corrosion, earth conductor sectional area may be caused to reduce or fracture, thus lose defencive function.
Searching the breakpoint of grounded screen and etch state is one of important preventive damage control of one, electric system Yun Jian department.The breakpoint of guide body line and corrosion default in Timeliness coverage grounded screen, and repair in time, the normal table for system runs most important.After power department diagnoses the common method of ground net corrosion or fracture defect to cross certain time limit exactly, sampling excavates inspection, the primitive approach such as general employing is shaken, knock, by observing and feeling to judge its breakpoint and corrosion condition, according to general configuration and the rate of corrosion of grounded screen distribute soil, estimate the etch state of grounded screen by rule of thumb.This method has blindness, and workload is large, needs to consume a large amount of human and material resources and financial resources, is also subject to the restriction of on-the-spot service condition simultaneously, is difficult to the defect diagnosing earthing device accurately.For the detection of upper guide body line, judged result poor reliability.
Summary of the invention
The purpose of this utility model is that the method for the defect solving guide body line in existing detection grounded screen exists that blindness is large, workload large, judged result poor reliability and the high technical matters of testing cost, provides the device of guide body line defect selective mechanisms in a kind of grounded screen.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A device for guide body line defect selective mechanisms in grounded screen, comprises 1kHz sine-wave current transmitter and impedance measurement analytic system, and described 1kHz sine-wave current transmitter is used for providing sine-wave current signal; Described impedance measurement analytic system is used for potential difference (PD) and the branch-path electric current of synchro measure 1kHz simple sinusoidal alternating current source output terminal mouth, and calculate the impedance of tributary port, compared by the impedance of branch road and the threshold value of setting, judge this branch road whether existing defects, thus judge the breakpoint or the etch state that detect guide body line in whole grounded screen, to diagnose the defect state of guide body line in grounded screen;
Described 1kHz sine-wave current transmitter is made up of regulation unit, buffer cell, signal waveform generating unit, power amplification unit and isolating transformer output unit, described regulation unit is connected with buffer cell and signal waveform generating unit respectively, buffer cell is connected with signal waveform generating unit, signal waveform generating unit is connected with power amplification unit, and power amplification unit is connected with isolating transformer output unit;
Described impedance measurement analytic system is made up of voltage transformer (VT), current transformer, A/D translation data capture card and host computer, described voltage transformer (VT) summation current transformer is connected with the input end of A/D translation data capture card respectively, and the output terminal of A/D translation data capture card is connected with the input end of host computer.
Adopt the device of guide body line defect selective mechanisms in above-mentioned grounded screen to carry out the method for guide body line defect selective mechanisms in grounded screen, this step is:
1) the earth's surface exposed part of upper for grounded screen one guide body line is connected with the cathode output end in 1kHz simple sinusoidal alternating current source by an earth's surface return wire, then centered by guide body line, palp upper guide body lines all around it is all connected in parallel with the positive pole in 1kHz simple sinusoidal alternating current source simultaneously and forms each branch road on this;
2) impedance measurement system is utilized, the potential difference (PD) of synchro measure 1kHz simple sinusoidal alternating current source positive pole and cathode output end mouth and the loop current of each branch road, the impedance of each tributary port of computational analysis, calculates the mean value of each tributary port impedance and filters out that branch road of maximum impedance;
3) again by step 1) method, the negative pole connection status in 1kHz simple sinusoidal alternating current source is constant, only by step 2) in filter out the positive pole that the maximum branch road of impedance is connected to separately 1kHz simple sinusoidal alternating current source, strengthen Injection Current intensity, the potential difference (PD) of synchro measure 1kHz simple sinusoidal alternating current source output terminal mouth and this branch-path electric current, again calculate the impedance of this tributary port, and the impedance of this branch road and the threshold value of setting are compared, if this tributary port impedance is greater than threshold value, then judge the upper guide body line existing defects of this branch road 2; If this tributary port impedance is less than or equal to threshold value, then judge the upper guide body line zero defect of this branch road 2;
4) 1 is adopted)-3) detection method of step detects breakpoint or the etch state of guide body line in whole grounded screen, to diagnose the defect state of guide body line in grounded screen.
The utility model adopts above technical scheme, guide body line on suspected defects is filtered out by actual measurement, again with by through strict theory calculate and grounded screen normal time accurately measure setting impedance threshold compare, determine upper guide body line defect, the method solving the defect of guide body line in existing detection grounded screen exist that blindness is large, workload is large, judged result poor reliability and the high technical matters of testing cost.Therefore, compared with background technology, the utility model has easy and simple to handle, that testing result reliability is high and detection efficiency is high advantage.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model 1kHz sine-wave current transmitter;
Fig. 2 is the structured flowchart of the utility model impedance measurement analytic system;
Fig. 3 is the connection diagram of the utility model when detecting each branch impedance;
Fig. 4 is the principle schematic of the utility model when detecting the maximum branch road of impedance;
Fig. 5 is the utility model inspection software routine analyzer figure.
Embodiment
The device of guide body line defect selective mechanisms in a kind of grounded screen in the present embodiment, comprises 1kHz sine-wave current transmitter and impedance measurement analytic system, and described 1kHz sine-wave current transmitter is used for providing sine-wave current signal; Described impedance measurement analytic system is used for potential difference (PD) and the branch-path electric current of synchro measure 1kHz simple sinusoidal alternating current source output terminal mouth, and calculate the impedance of tributary port, compared by the impedance of branch road and the threshold value of setting, judge this branch road whether existing defects, thus judge the breakpoint or the etch state that detect guide body line in whole grounded screen, to diagnose the defect state of guide body line in grounded screen;
As shown in Figure 1, described 1kHz sine-wave current transmitter is made up of regulation unit 1, buffer cell (MAX421) 2, signal waveform generating unit (MAX038) 3, power amplification unit (CA1500) 4 and 1:1 isolating transformer output unit 5, described regulation unit 1 is made up of the first chip (MX7541) and the second chip (MC1451), 2 of described first chip (MX7541), 3 pin are connected with 11 pin of the second chip (MC1451) and ground connection, 8 of second chip (MC1451), 9 pin respectively with 2 of buffer cell (MAX421) 2, 3 pin connect, 2 pin of the first chip (MX7541) are connected with 1 pin of signal waveform generating unit (MAX038) 3, 6 pin output terminals of the second chip (MC1451) are connected with 8 pin of signal waveform generating unit (MAX038) 3, 19 pin output terminals of signal waveform generating unit (MAX038) 3 are connected with the input end of power amplification unit (CA1500) 4, the output terminal of power amplification unit (CA1500) 4 is connected with the primary coil of 1:1 isolating transformer, the output unit sine wave output current signal of 1:1 isolating transformer,
As shown in Figure 2, described impedance measurement analytic system is made up of voltage transformer (VT) 6, current transformer 7, A/D translation data capture card (USB6210) 8 and host computer 9, described voltage transformer (VT) 6 structure is: on the nanocrystalline magnet core ring of an internal diameter 20mm, external diameter 30mm, armature winding 2000 circle, secondary winding 1000 circle, wire diameter φ is 0.1mm; The structure of described current transformer 7 is: be respectively on the nanocrystalline magnet core ring of 10mm and 20mm in an inside and outside footpath, armature winding 2 circle, wire diameter 1mm, secondary winding 2000 circle, wire diameter 0.17mm; Described voltage transformer (VT) summation current transformer is connected with the input end of A/D translation data capture card respectively, and the output terminal of A/D translation data capture card is connected with the input end of host computer.
Adopt the device of guide body line defect selective mechanisms in grounded screen described in the present embodiment to carry out the method for the defect selective mechanisms of guide body line in grounded screen, this step is:
1) as shown in Figure 3, the earth's surface exposed part of upper for grounded screen one guide body line is connected with the cathode output end in 1kHz simple sinusoidal alternating current source by an earth's surface return wire, then centered by guide body line, palp upper guide body lines all around it is all connected in parallel with the positive pole in 1kHz simple sinusoidal alternating current source simultaneously and forms each branch road on this;
2) impedance measurement system is utilized, the potential difference (PD) of synchro measure 1kHz simple sinusoidal alternating current source positive pole and cathode output end mouth and the loop current of each branch road, the impedance of each tributary port of computational analysis, calculates the mean value of each tributary port impedance and filters out that branch road of maximum impedance;
3) again by step 1) method, the negative pole connection status in 1kHz simple sinusoidal alternating current source is constant, only by step 2) in filter out the positive pole that the maximum branch road of impedance is connected to separately 1kHz simple sinusoidal alternating current source, strengthen Injection Current intensity [to illustrate: general initial current about 5A-10A, during targeted detection, electric current can be strengthened gradually, 80A-100A can be reached, if lead-in wire seriously corroded, so electric current adds to a certain extent, just cannot increase], the potential difference (PD) of synchro measure 1kHz simple sinusoidal alternating current source output terminal mouth and this branch-path electric current, again calculate the impedance of this tributary port, and the impedance of this branch road and the threshold value of setting are compared, if this tributary port impedance is greater than threshold value, then judge the upper guide body line existing defects of this branch road 2, if this tributary port impedance is less than or equal to threshold value, then judge the upper guide body line zero defect of this branch road 2,
4) 1 is adopted)-3) detection method of step detects breakpoint or the etch state of guide body line in whole grounded screen, to diagnose the defect state of guide body line in grounded screen.
Cleaning Principle of the present utility model is:
As shown in Figure 3, with n1 node in Fig. 3 for reference point, be connected to the cathode output end mouth in 1kHz simple sinusoidal alternating current source, be adjacent near upper guide body line contact n2, n3, n4 and n5 are all connected in 1kHz simple sinusoidal alternating current source cathode output end mouth by earth's surface return lead, if 1kHz simple sinusoidal alternating current source positive pole and cathode output end mouth potential difference (PD) are u, each branch current is designated as i successively
12, i
13..., i
1n, each branch impedance is designated as Z successively
12, Z
13..., Z
1n.Because the resistivity of metal grounding network conductor is much smaller than soil resistivity, the impact of soil leakage current can be ignored, then can set up following Matrix division:
In the hope of node n1 and allly adjacently internodal resistance value Z can be touched by Matrix division (1)
12, Z
13..., Z
1n, more each branch impedance value, filter out that branch road of wherein maximal value, its impedance is designated as Z
1x, then this branch road is suspected defects node.Press again shown in Fig. 4, separately 1kHz simple sinusoidal alternating current source cathode output end is connected on this suspected defects Nodes, strengthen Injection Current, accurately measure its impedance Z
1X, and compare with setting threshold value.
Utilize method of moment and electric network theory, the resulting impedance that can obtain each branch conductor is:
(2) in formula, Z
aCby the AC impedance of analysis branch road under 1kHz frequency, r is the radius of the equivalent circular conductor of grounding grids sectional area S
r
dCby the DC resistance of analysis branch road, f is power frequency.Can obtain at whole branch road resistance value under normal circumstances, in addition, through testing the resistance value Z between the similar node of identical newly-built grounded screen under same frequency through calculating
0, by Z
aCand Z
0mean value be set as impedance threshold Z
bas benchmark.Pass through measured value Z
1Xwith threshold value Z
bcompare, if measured value Z
1Xbe greater than Z
b, just can judge the node n of this branch road
xon place there is heavy corrosion defect in guide body line.
The utility model inspection software routine analyzer is:
As shown in Figure 5, start and initialization after, the impedance magnitude Z that when input grounding net is normal, original measurement obtains
0, calculate branch impedance theoretical value Z simultaneously
aC, the mean value both then calculating, determines impedance threshold Z
b.Synchro measure computing node n
1with the impedance Z of all adjacent node branch roads
12, Z
13..., Z
1n, contrast obtains the branch impedance Z of each branch road maximal value
1x, independent high current precision measurement suspected defects branch impedance Z ' again
1x.Relatively Z '
1xwith threshold value Z
bobtain defect state and the security performance of down conductor, after all upper guide body line detects, terminate program.
Claims (1)
1. the device of guide body line defect selective mechanisms in grounded screen, it is characterized in that: comprise 1kHz sine-wave current transmitter and impedance measurement analytic system, described 1kHz sine-wave current transmitter is used for providing sine-wave current signal; Described impedance measurement analytic system is used for potential difference (PD) and the branch-path electric current of synchro measure 1kHz simple sinusoidal alternating current source output terminal mouth, and calculate the impedance of tributary port, compared by the impedance of branch road and the threshold value of setting, judge this branch road whether existing defects, thus judge the breakpoint or the etch state that detect guide body line in whole grounded screen, to diagnose the defect state of guide body line in grounded screen;
Described 1kHz sine-wave current transmitter is made up of regulation unit, buffer cell, signal waveform generating unit, power amplification unit and isolating transformer output unit, described regulation unit is connected with buffer cell and signal waveform generating unit respectively, buffer cell is connected with signal waveform generating unit, signal waveform generating unit is connected with power amplification unit, and power amplification unit is connected with isolating transformer output unit;
Described impedance measurement analytic system is made up of voltage transformer (VT), current transformer, A/D translation data capture card and host computer, described voltage transformer (VT) summation current transformer is connected with the input end of A/D translation data capture card respectively, and the output terminal of A/D translation data capture card is connected with the input end of host computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182168A (en) * | 2015-10-10 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Defect screening detection apparatus of grounding network upper guide body wire |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
-
2015
- 2015-10-10 CN CN201520785962.2U patent/CN205003237U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182168A (en) * | 2015-10-10 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Defect screening detection apparatus of grounding network upper guide body wire |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
| CN107843784B (en) * | 2017-10-27 | 2019-10-11 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics test method to be flowed back using earth mat |
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Granted publication date: 20160127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |