CN105510721A - Grounding grid ground resistance measuring device and using method thereof - Google Patents
Grounding grid ground resistance measuring device and using method thereof Download PDFInfo
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- CN105510721A CN105510721A CN201610093303.1A CN201610093303A CN105510721A CN 105510721 A CN105510721 A CN 105510721A CN 201610093303 A CN201610093303 A CN 201610093303A CN 105510721 A CN105510721 A CN 105510721A
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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
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Abstract
The embodiment of the invention discloses a grounding grid ground resistance measuring device and a using method thereof. The measuring device comprises a current pole, a voltage pole, a current lead, a voltage lead, a collecting module and a processing module. The current pole is a rectangular current pole formed by arranging four sets of galvanized copper bars in a rectangle shape. The voltage pole comprises 6-7 sets of single-end voltage pole bodies. The length of the current lead and the length of the voltage lead are 1.5-2 D. The collecting module comprises a current collecting module body and a voltage collecting module body. The current pole is electrically connected with a grounding grid by means of the current lead. The current lead is sleeved with the current collecting module body. The voltage pole is electrically connected with the grounding grid through the voltage lead. The voltage collecting module body is electrically connected with the voltage pole and the grounding grid. The current collecting module body and the voltage collecting module body are electrically connected with the processing module. According to the measuring device, the current pole is a combined current pole, the voltage pole comprises the multiple single-end voltage pole bodies, the current lead and the voltage lead are arranged by adopting short leads, it is ensured that measuring work is convenient and fast, and the measurement result is more accurate.
Description
Technical field
The present invention relates to Grounding Technology of Modern Power System field, particularly relate to a kind of New Device for Grounding Resistance Measurement of Grounding Grids and using method thereof.
Background technology
The introducing of grounding technology is the protective measure taked to prevent the equipment such as electric power or electronics to be struck by lightning at first, and object is that the thunder-strike current that thunder and lightning produces is incorporated into the earth by lightning rod, thus plays the effect of architecture protection thing.Simultaneously; ground connection is also a kind of effective means of protection personal safety; the phase line caused when certain reason is (as wire insulation is bad; aging circuit etc.) and device housings touches time; the shell of equipment will produce by dangerous voltage; the electric current generated thus through protection ground wire to the earth, thus will play personal safety protective effect.
Power plants and station stake resistance refer to that electric current flows into the earth by earthing device and flows to another grounding body through the earth again or distally spread the resistance that runs into, it comprises the resistance of ground wire and grounding body itself, contact resistance between grounding body and the resistance of the earth, and between two grounding bodies the resistance of the earth or grounding body to the ground resistance of unlimited distance.Stake resistance is used to weigh a whether good important parameter of ground state; transmission transformer station impedance ground is directly connected to power system security reliability service; the level of its reaction electric system lightning protection, protective ground and working earthing and ability, the important measuring technique during measurement of therefore stake resistance.
When traditional footing impedance measuring apparatus measures Grounding impedance, exist and measure the problem that lead-in wire is long, requirements for power supply power is too high, the wiring process of a possibility Generic Substation just needs the manpower of at substantial, brings great difficulty to in-site measurement.And when measuring, the measurement that, steepness height Field potentials large for surface potential rate of curve distributes, voltage pole is arranged and location is difficult to accomplish accurately, therefore to cause the measuring accuracy of existing apparatus also inaccurate.
Summary of the invention
A kind of New Device for Grounding Resistance Measurement of Grounding Grids and using method thereof is provided, to solve measurement mechanism measurement of Grounding Resistance more complicated of the prior art and the inaccurate problem of precision in the embodiment of the present invention.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
A kind of New Device for Grounding Resistance Measurement of Grounding Grids, comprise electric current pole, voltage pole, current feed, voltage lead, acquisition module and processing module, the rectangular current pole of described electric current very 4 groups of zinc-plated copper rod rectangular arrangement compositions, described voltage pole comprises 6-7 group single ended voltage pole, described current feed and described voltage lead length are 1.5-2D, and described acquisition module comprises current acquisition module and voltage acquisition module; Described electric current pole is electrically connected with grounded screen by described current feed, and described current acquisition module is socketed on described current feed; Described voltage pole is electrically connected with grounded screen by voltage lead, and described voltage acquisition module is electrically connected with voltage pole, grounded screen respectively; Described current acquisition module, described voltage acquisition module are all electrically connected with described processing module.
Preferably, each zinc-plated copper rod distance rectangle diagonal line intersection point distance of described electric current pole is 1-1.5 rice.
Preferably, be provided with a short conductors between described single ended voltage pole and voltage lead, described short conductors is for connecting described single ended voltage pole and described voltage lead.
Preferably, between described single ended voltage pole, spacing distance is 1-1.5 rice.
Preferably, be provided with power supply between described electric current pole and described grounded screen, the two ends of described power supply are electrically connected with described electric current pole and described grounded screen respectively.
Preferably, described current acquisition module comprises current transformer, hardware filtering unit and digital to analog converter, described electric current pole is electrically connected with described current transformer input end, described hardware filtering unit is electrically connected with the output terminal of described current transformer, the input end of described digital to analog converter respectively, and the output terminal of described digital to analog converter is connected to processing module.
Preferably, described voltage acquisition module comprises voltage transformer (VT), hardware filtering unit and digital to analog converter, described voltage pole is electrically connected with described voltage transformer (VT) input end, described hardware filtering unit is electrically connected with the output terminal of described voltage transformer (VT), the input end of described digital to analog converter respectively, and the output terminal of described digital to analog converter is connected to processing module.
Preferably, the voltage transformer (VT) in described voltage acquisition module, hardware filtering unit and digital to analog converter are provided with 6-7 group.
A using method for New Device for Grounding Resistance Measurement of Grounding Grids, comprises the following steps:
Use the New Device for Grounding Resistance Measurement of Grounding Grids described in claim 1-9;
Arrange described New Device for Grounding Resistance Measurement of Grounding Grids electric current pole and voltage pole;
The parameter of New Device for Grounding Resistance Measurement of Grounding Grids described in initialization;
Acquisition module gathers measurement data, by described data transfer to processing module;
Described processing module carries out analytical calculation to described measurement data, obtains grounding resistance measurement value.
From above technical scheme, a kind of New Device for Grounding Resistance Measurement of Grounding Grids that the embodiment of the present invention provides and using method thereof, comprise electric current pole, voltage pole, current feed, voltage lead, acquisition module and processing module, the rectangular current pole of electric current very 4 groups of zinc-plated copper rod rectangular arrangement compositions, voltage pole comprises 6-7 group single ended voltage pole, current feed and voltage lead length are 1.5-2D, and acquisition module comprises current acquisition module and voltage acquisition module; Electric current pole is electrically connected with grounded screen by current feed, and current acquisition module is socketed on current feed; Voltage pole is electrically connected with grounded screen by voltage lead, and voltage acquisition module is electrically connected with voltage pole, grounded screen respectively; Current acquisition module, voltage acquisition module are all electrically connected with processing module.Measurement mechanism electric current provided by the invention very combined current pole, voltage pole also comprises many group single ended voltage pole, and current feed and voltage lead have employed short leg and arrange, ensure that surveying work is convenient and swift, and measurement result are more accurate.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation that Fig. 1 arranges for a kind of New Device for Grounding Resistance Measurement of Grounding Grids that the embodiment of the present invention provides;
The structural representation of a kind of electric current pole that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of voltage pole that Fig. 3 provides for the embodiment of the present invention;
The acquisition module structural representation of a kind of New Device for Grounding Resistance Measurement of Grounding Grids that Fig. 4 provides for the embodiment of the present invention;
A kind of New Device for Grounding Resistance Measurement of Grounding Grids using method schematic diagram that Fig. 5 provides for the embodiment of the present invention;
In Fig. 1-4, symbol is expressed as:
1-electric current pole, the zinc-plated copper rod of 101-first, the zinc-plated copper rod of 102-second, the zinc-plated copper rod of 103-the 3rd, the zinc-plated copper rod of 104-the 4th, 2-voltage pole, 3-current feed, 4-voltage lead, 5-acquisition module, 51-current acquisition module, 511-current transformer, 52-voltage acquisition module, 521-voltage transformer (VT), 6-processing module, 7-single ended voltage pole, 8-grounded screen, 9-short conductors, 10-power supply, 11-hardware filtering unit, 12-digital to analog converter, 13-shields annealed copper wire.
Embodiment
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
See Fig. 1, for the structural representation of a kind of New Device for Grounding Resistance Measurement of Grounding Grids layout that the embodiment of the present invention provides, as shown in the figure, described New Device for Grounding Resistance Measurement of Grounding Grids, comprise electric current pole 1, voltage pole 2, current feed 3, voltage lead 4, acquisition module 5 and processing module 6, described processing module 5 comprises current acquisition module 51 and voltage acquisition module 52; Described electric current pole 1 is electrically connected with grounded screen 8 by described current feed 3, and described current acquisition module 51 is socketed on described current feed; Described voltage pole 2 is electrically connected with grounded screen 8 by voltage lead 4, and described voltage acquisition module 52 is electrically connected with voltage pole 2, grounded screen 8 respectively; Described current acquisition module 51, described voltage acquisition module 52 are all electrically connected with described processing module 6.
See Fig. 2, described electric current pole 1 is by the first zinc-plated copper rod 101, second zinc-plated copper rod 102, the rectangular current pole of the 3rd zinc-plated copper rod 103 and the 4th zinc-plated copper rod 104 rectangular arrangement composition, the each zinc-plated copper rod distance rectangle diagonal line intersection point distance of described electric current pole 1 is 1-1.5 rice, i.e. the first zinc-plated copper rod 101 in Fig. 2, second zinc-plated copper rod 102, 3rd zinc-plated copper rod 103 and the 4th zinc-plated copper rod 104 are 1-1.5 rice to the distance of rectangular current pole diagonal line intersection point A, wherein each zinc-plated copper rod is long 1.2 meters, the zinc-plated copper rod of the tip that radius is 0.03 millimeter, cusp design is to vertically jump the queue stable for electric current pole 1 in ground during surveying work, about generally entering ground 0.5-0.8 rice.
See Fig. 3, described voltage pole 2 comprises 6 groups of single ended voltage poles 7, and described single ended voltage pole 7 adopts long 0.5 meter, the tip platinum plating copper rod of radius 8 millimeters, the top of the non-tip end of 6 groups of single ended voltage poles 7 is radius 5 millimeters, and the short conductors 9 of long 0.1 meter, described short conductors 9 is for wiring.Between described single ended voltage pole 7, spacing distance is 1-1.5 rice, and during in-site measurement, described single ended voltage pole 7 is arranged in a linear, and the straight line arragement direction of described single ended voltage pole 7 overlaps with arbitrary diagonal line of described rectangular current pole.
The voltage lead 3 be connected with described voltage pole 2 is in the present embodiment 6 core shielded cables, and unit cable employing sectional area is the shielding annealed copper wire 13 of 1 square millimeter, and the straight length of described voltage lead and current feed is 1.5-2D.
Be provided with power supply 10 between described electric current pole 1 and described grounded screen 8, the two ends of described power supply 10 are electrically connected with described electric current pole 1, described grounded screen 8 respectively, and the setting of described power supply 10 measures electric current to provide to measurement mechanism to export.
As shown in Figure 4, described acquisition module 5 comprises current acquisition module 51 and voltage acquisition module 52, described current acquisition module 51 comprises current transformer 511, hardware filtering unit 11 and digital to analog converter 12, described electric current pole 1 is electrically connected with described current transformer 511 input end, described hardware filtering unit 11 is electrically connected with the output terminal of described current transformer 511, the input end of described digital to analog converter 12 respectively, the output terminal of described digital to analog converter 12 is connected to processing module 6, and described current transformer 511 preferably adopts punching high-precision rogowski coil.
Described voltage acquisition module 52 comprises voltage transformer (VT) 521, hardware filtering unit 11 and digital to analog converter 12, described voltage pole 2 is electrically connected with described voltage transformer (VT) 521 input end, described hardware filtering unit 11 is electrically connected with the output terminal of described voltage transformer (VT) 521, the input end of described digital to analog converter 12 respectively, the output terminal of described digital to analog converter 12 is connected to processing module 6, in the present embodiment, in described voltage acquisition module 52, voltage transformer (VT) 521, hardware filtering unit 11 and digital to analog converter 12 are provided with 6 groups.
In the present embodiment, voltage pole have employed 6 groups of single ended voltage poles, in actual measurement work, 7 groups or more single ended voltage can have been adopted extremely to have carried out measurement, be not limited to 6 groups of above-mentioned single ended voltage poles.
As seen from the above-described embodiment, a kind of New Device for Grounding Resistance Measurement of Grounding Grids that the present embodiment provides, comprise electric current pole 1, voltage pole 2, current feed 3, voltage lead 4, acquisition module 5 and processing module 6, electric current pole 1 is the rectangular current pole of 4 groups of zinc-plated copper rod rectangular arrangement compositions, voltage pole 2 comprises 6-7 group single ended voltage pole, current feed 3 and voltage lead 4 length are 1.5-2D, and acquisition module 5 comprises current acquisition module 51 and voltage acquisition module 52; Electric current pole 1 is electrically connected with grounded screen 8 by current feed 3, and current acquisition module 51 is socketed on current feed 3; Voltage pole 2 is electrically connected with grounded screen 8 by voltage lead 4, and voltage acquisition module 52 is electrically connected with voltage pole 2, grounded screen 8 respectively; Current acquisition module 51, voltage acquisition module 52 are all electrically connected with processing module 6.Measurement mechanism electric current pole 1 provided by the invention is combined current pole, and voltage pole 2 also comprises many group single ended voltage pole 7, and current feed 3 and voltage lead 4 have employed short leg and arrange, ensure that surveying work is convenient and swift, and measurement result are more accurate.
Corresponding with a kind of New Device for Grounding Resistance Measurement of Grounding Grids embodiment provided by the invention, present invention also offers a kind of embodiment of New Device for Grounding Resistance Measurement of Grounding Grids using method.
See Fig. 5, be a kind of New Device for Grounding Resistance Measurement of Grounding Grids using method schematic diagram that the embodiment of the present invention provides,
S101, arranges described New Device for Grounding Resistance Measurement of Grounding Grids electric current pole 1 and voltage pole 2;
Arrange New Device for Grounding Resistance Measurement of Grounding Grids, connect Substation Station 220V power frequency supply with patching panel.Carry out device wiring, arrange voltage pole 2 at electric current pole 1 place.Arrange and measure current feed 3 and voltage lead 4, current feed 3 connects electric current pole 1, and verifies that conduction is intact.Voltage pole 2 position and electric current pole span are from being 5-11 rice.Current feed 3 penetrates current transformer 511, and voltage lead one end connects grounded screen 8 downlead and connects voltage transformer (VT) 522 high-pressure side, and other 6 lead-in wires connect 6 single ended voltage poles 7 of drawing at voltage input end respectively.
S102, the parameter of New Device for Grounding Resistance Measurement of Grounding Grids described in initialization;
After S101 completes, open the power switch of measurement mechanism, not Injection Current, acquisition module 5 gathers voltage disturbance signal, is checked waveform and the frequency band range of voltage disturbance signal by the data output display module connected.Frequency range and the amplitude of measuring input current is determined according to the amplitude of interference voltage and frequency band.The frequency range of input and output electric current and amplitude.The optional frequency range 40-60HZ of output current, step frequency 1HZ, current amplitude 3-10A, original frequency 40HZ.
Preserved by initial setting up, and carry out following Lookup protocol:
1, output current original frequency is defaulted as 40HZ, and step-length is 1HZ, output current amplitude 6A;
2, the step of a program control broadband alien frequencies power supply output current is: (1) output current rises to setting value from 0, and (2) output current keeps and issues measuring command, and (3) output current reduces to 0;
3, program control broadband alien frequencies electric power outputting current frequency increases 1HZ, repeats 2 steps;
4, electric power outputting current frequency reaches the upper limit, and measurement completes, and stops exporting, power ground
S103, acquisition module 5 gathers measurement data, by described data transfer to processing module 6;
After S102 completes, start to measure.Gather the current signal I of electric current the pole 1 and measuring-signal U of voltage pole 2 respectively.Current signal is first by current transformer 511, voltage signal is by voltage transformer (VT) 521, then filtering high-frequency interferencing signal is processed through hardware filter 13, then by digital to analog converter 14, carry out high sample frequency data acquisition, realize the conversion of digital signal to simulating signal, data are stored in storer.
S104, described processing module 6 carries out analytical calculation to described measurement data, obtains grounding resistance measurement value;
After S103 completes, the first-selected frequency adopting Fourier analysis program to obtain current measuring-signal, calculates the impedance ground value under this frequency.Impedance ground computing formula: Z=U/I.Store measurement voltage signal waveform, measure current signal waveform, impedance ground value, data are saved in memory module, store the collection signal parameter of different frequency successively.
Data analysis, calculated after, processing module 6 calls the impedance ground data of storage.First a screening is carried out to data, reject wherein singular point as rub-out signal.Then call difference program, analyze the impedance ground data under 40-60HZ, calculate the impedance ground value under 50HZ.Successively data processing is carried out to current signal, voltage signal 1 to voltage signal 6.Voltage pole is apart from electric current pole span from X, and grounding resistance Z forms data to (X, Z), finally calls stake resistance data fitting calculation procedure, calculates the grounding resistance measurement value of grounded screen.Data memory module stores the measurement data of impedance ground, data is outputted to data output display module and data memory module, for calling at any time and show later.
It should be noted that, in this article, the such as relational terms of " first " and " second " etc. and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a New Device for Grounding Resistance Measurement of Grounding Grids, comprise electric current pole (1), voltage pole (2), current feed (3), voltage lead (4), acquisition module (5) and processing module (6), it is characterized in that, described electric current pole (1) is the rectangular current pole of 4 groups of zinc-plated copper rod rectangular arrangement compositions, described voltage pole (2) comprises 6-7 group single ended voltage pole (7), described current feed (3) and described voltage lead (4) length are 1.5-2D, described acquisition module (5) comprises current acquisition module (51) and voltage acquisition module (52), described electric current pole (1) is electrically connected with grounded screen (8) by described current feed (3), and described current acquisition module (51) is socketed on described current feed (3), described voltage pole (2) is electrically connected with grounded screen (8) by voltage lead (4), and described voltage acquisition module (52) is electrically connected with voltage pole (2), grounded screen (8) respectively, described current acquisition module (51), described voltage acquisition module (52) are all electrically connected with described processing module (6).
2. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 1, is characterized in that, each zinc-plated copper rod distance rectangle diagonal line intersection point distance of described electric current pole (1) is 1-1.5 rice.
3. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 1, it is characterized in that, be provided with a short conductors (9) between described single ended voltage pole (7) and voltage lead (4), described short conductors (9) is for connecting described single ended voltage pole (7) and voltage lead (4).
4. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 3, is characterized in that, between described single ended voltage pole (7), spacing distance is 1-1.5 rice.
5. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 1, it is characterized in that, be provided with power supply (10) between described electric current pole (1) and described grounded screen (8), the two ends of described power supply (10) are electrically connected with described electric current pole (1) and described grounded screen (8) respectively.
6. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 1, it is characterized in that, described current acquisition module (51) comprises current transformer (511), hardware filtering unit (11) and digital to analog converter (12), described electric current pole (1) is electrically connected with described current transformer (511) input end, described hardware filtering unit (11) respectively with the output terminal of described current transformer (511), the input end electrical connection of described digital to analog converter (12), the output terminal of described digital to analog converter (12) is connected to processing module (6).
7. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 1, it is characterized in that, described voltage acquisition module (52) comprises voltage transformer (VT) (521), hardware filtering unit (11) and digital to analog converter (12), described voltage pole (2) is electrically connected with described voltage transformer (VT) (521) input end, described hardware filtering unit (11) respectively with the output terminal of described voltage transformer (VT) (521), the input end electrical connection of described digital to analog converter (12), the output terminal of described digital to analog converter (12) is connected to processing module (6).
8. New Device for Grounding Resistance Measurement of Grounding Grids according to claim 7, it is characterized in that, the voltage transformer (VT) (521) in described voltage acquisition module (52), hardware filtering unit (11) and digital to analog converter (12) are provided with 6-7 group.
9. a using method for New Device for Grounding Resistance Measurement of Grounding Grids, is characterized in that, comprises the following steps:
Use the New Device for Grounding Resistance Measurement of Grounding Grids described in claim 1-8;
Arrange described New Device for Grounding Resistance Measurement of Grounding Grids electric current pole (1) and voltage pole (2);
The parameter of New Device for Grounding Resistance Measurement of Grounding Grids described in initialization;
Acquisition module (5) gathers measurement data, by described data transfer to processing module (6);
Described processing module (6) carries out analytical calculation to described measurement data, obtains grounding resistance measurement value.
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| CN110850332A (en) * | 2019-11-20 | 2020-02-28 | 深圳市奇辉电气有限公司 | Trend statistical type grounding body monitoring method and device |
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| CN107271760A (en) * | 2017-05-28 | 2017-10-20 | 西南交通大学 | Power-frequency voltage bipolar plates assessment device and method in ground |
| CN107271760B (en) * | 2017-05-28 | 2019-12-10 | 西南交通大学 | Device and method for evaluating underground power frequency voltage bipolar plate |
| CN110850332A (en) * | 2019-11-20 | 2020-02-28 | 深圳市奇辉电气有限公司 | Trend statistical type grounding body monitoring method and device |
| CN113311266A (en) * | 2021-05-25 | 2021-08-27 | 国网陕西省电力公司电力科学研究院 | Comprehensive testing device and testing method for power frequency characteristics of ground network device |
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