CN204679586U - A kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density - Google Patents
A kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density Download PDFInfo
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- CN204679586U CN204679586U CN201520398613.5U CN201520398613U CN204679586U CN 204679586 U CN204679586 U CN 204679586U CN 201520398613 U CN201520398613 U CN 201520398613U CN 204679586 U CN204679586 U CN 204679586U
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Abstract
The utility model relates to a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density, comprises a current injection device, and it is connected with arbitrary accessible node of grounded screen; One signal measurement apparatus, it is positioned at measures directly over conductor; One data collector, it is connected with signal measurement apparatus; One signal analysis display terminal, it is connected with data collector.Compared with prior art, the utility model has advantages such as ensureing substation safety stable operation.
Description
Technical field
The utility model relates to Power System Faults Detection technical field, especially relates to a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density.
Background technology
Grounded screen is the important component part of transformer station, it provides a common potential reference point for various kinds of equipment in transformer station, electric system be short-circuited fault or be struck by lightning time current drain passage is provided, the safe and stable operation impact on electric system of the reliability of its work is great.
Grounding net of transformer substation is embedded in underground for a long time, is subject to the electrochemical action of soil and usually corrodes.The corrosion of grounded screen is the process of a gradual change, is etched to and to a certain degree then produces fault, ruptures time more serious.China's existing grounded screen many employings zinc-coated flat steel sheet material, and most of grounding net of transformer substation runs 5-10, to attenuate the defects such as even fracture there is corrosion in varying degrees.Meanwhile, in the welding procedure process of grounded screen, also may there is the problem of tie point rosin joint, solder skip, under the corrosive attack of soil, cause the tie point of many conductors to disconnect.All kinds of defect all can cause the reduction of Grounding performance above, even can cause the generation of major accident.How find the fault existed in grounding net of transformer substation accurately and effectively, and then take safeguard procedures to become in the existing grounded screen maintenance work of power industry distinct issues the most targetedly.
Current in engineer applied, excavate the etch state of grounded screen to grounded screen often through large area and detect, this method comparatively blindly, both wasted time and energy, and can bring certain economic loss again because of long-time interruption maintenance.In addition, according to the characteristics of the dispersed flow of grounding net of transformer substation, some new grounded screen fault detection methods also occur successively, can be divided into the large class of Electrical network analysis method, electromagnetic field analysis method two.Electrical network analysis method mainly sets up diagnosis equation according to grounded screen topological structure and branch resistance data, solves this equation and obtains conductor branches resistance variations situation, realize fault diagnosis in conjunction with corresponding optimized algorithm.But the not all node of grounded screen has upper guide body in actual applications, be therefore difficult to the exact value obtaining every bar branch resistance, thus limit the application of the method.Electromagnetic field analysis rule is reached the standard grade by grounding lead, injects exciting current, measure Potential distribution or the Distribution of Magnetic Field on the grounded screen earth's surface that this electric current excites to grounded screen, diagnoses the corrosion failure that grounded screen exists.Surface potential method needs to measure a large amount of surface potential data, finds data catastrophe point and carries out fault diagnosis.And actual substation grounding web area is comparatively large, and mostly be cement flooring, be difficult to the exact value obtaining surface potential, thus have impact on the diagnostic accuracy of the method.Magnetic field rule measures the magnetic field levels component perpendicular to conductor on earth's surface directly over conductor, and the distribution characteristics according to magnetic induction density carries out fault diagnosis to grounded screen.The method does not limit by surface conditions, can realize the diagnosis to all kinds of fracture defect of conductor when not having a power failure, and has higher accuracy and engineer applied is worth.
Utility model content
The purpose of this utility model be exactly in order to overcome above-mentioned prior art exist defect and a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density is provided, testing and analysis can be carried out to grounding net of transformer substation earth's surface Magnetic Induction Density Distribution, thus realize to grounding net of transformer substation corrosion failure efficient, judge accurately.
The purpose of this utility model can be achieved through the following technical solutions:
Based on a grounding net of transformer substation corrosion detection system for earth's surface magnetic induction density, it is characterized in that, comprising:
One current injection device, it is connected with arbitrary accessible node of grounded screen, injects the simple sinusoidal alternating current differing from power frequency to grounded screen, and this alternating current is injected, for exciting alternating magnetic field by the arbitrary accessible node of grounded screen;
One signal measurement apparatus, it is positioned at measures directly over conductor, for measuring the Potential distribution directly over conductor on earth's surface;
One data collector, it is connected with signal measurement apparatus, for the electric potential signal of Received signal strength measurement mechanism transmission, and carries out filtering and amplification to electric potential signal;
One signal analysis display terminal, it is connected with data collector, to receive data and the signal of data collector transmission.
Described current injection device comprises:
One current signal generator, it provides the Injection Current of grounded screen;
One coupling transformer, it is connected with current signal generator, to receive Injection Current and to export with the input current of grounded screen matches impedances to the accessible node of grounded screen.
Described data collector comprises:
One voltage signal filtering circuit, it is connected with signal measurement apparatus, the electric potential signal exported in order to Received signal strength measurement mechanism, and the power frequency interference signals in this signal of filtering;
One voltage signal conditioning chip, it is connected with voltage signal filtering circuit, for carrying out anti-aliasing filter and amplification to this voltage signal;
One communication chip, it is connected with voltage signal conditioning chip and signal analysis display terminal respectively.
Described voltage signal filtering circuit is double-T shaped power frequency notch filter.
Be connected by Ethernet between described data collector and described signal analysis display terminal.
Compared with prior art, the detection system that the utility model provides, can not excavate in transformer station, under the prerequisite do not had a power failure, overcome electromagnetic environment interference and the topographic condition restriction of substation field complexity, judge the most common failures such as conductor corrosion cracking, conductor connection point disconnection and corrosion attenuate accurately and effectively, ensure substation safety stable operation; Have the following advantages:
1) for avoiding the interference of complex electromagnetic environment in transformer station, in magnetic field measuring device, hardware filtering circuit is provided with; Magnetic field detecting coil measures earth's surface magnetic induction density, and its output terminal connects the main power frequency interference signals of hardware filtering circuit filtering, by Signal transmissions to data collector; Described hardware filtering circuit adopts double-T shaped trapper.
2) when measuring earth's surface magnetic induction density, only need according to shown in drawing, directly over measurement conductor, horizontal direction is perpendicular to the magnetic induction density component of conductor; For every root tested conductor, with node be end points by its decile, and six Along ents choosing conductor are measuring point, without the need to measuring the magnetic induction density in whole grounded screen region, reduce surveying work amount, particularly effective to large-scale grounding network.
Accompanying drawing explanation
Fig. 1 is the structural schematic block diagram of the grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density described in the utility model.
Fig. 2 is the grounded screen model schematic in the utility model embodiment;
Fig. 3 is the double-T shaped power frequency notch filter for filtering described in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
With certain substation grounding pessimistic concurrency control for subjects, the utility model is described in detail.
Fig. 1 shows the structure of the grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density described in the utility model.As shown in Figure 1, current injection device 1 injects the simple sinusoidal alternating current differing from power frequency to grounded screen through the arbitrary accessible node of grounded screen 2, for exciting alternating magnetic field.Signal measurement apparatus 3 is in order to detect the ground potential distribution above grounded screen 2 conductor.Data collector 4 is connected with signal measurement apparatus 3, the electric potential signal that Received signal strength measurement mechanism 3 transmits, and carries out filtering Hz noise, anti-aliasing filter and amplification respectively to electric potential signal.Signal analysis display terminal 5 is connected with data acquisition, to receive data and the signal of data collector 4 transmission.Wherein, current injection device 1 comprises current signal generator, and it provides the Injection Current of grounded screen; Coupling transformer, it is connected with current signal generator, to receive Injection Current and to carry out impedance matching.Data collector 4 comprises voltage signal filtered circuit, and it is connected with signal measurement apparatus 3, the electric potential signal transmitted with Received signal strength measurement mechanism 3, and carries out power frequency filtering to this electric potential signal; Voltage signal conditioning chip, it is connected with voltage signal filtering circuit, with the voltage signal of receiver voltage traffic filter transmission, and carries out anti-aliasing filter and amplification to this voltage signal; Communication chip, it is connected by Ethernet 6 with Signal aspects terminal.
The above-mentioned grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density judges the duty of this grounded screen according to the following step:
(1) utilize current injection device 1 to inject the simple sinusoidal alternating current differing from power frequency to grounded screen, gather the ground potential distribution above grounding net of transformer substation conductor by the signal measurement apparatus 3 be placed on grounding net of transformer substation conductor overhead surface; When choosing measurement point, comprise two conductor end points, six Along ents choosing conductor are measured, and it is 5s that each measurement point measures duration;
(2) electric potential signal collected is transferred to data collector 4, after data acquisition signal carries out power frequency filtering, anti-aliasing filter and amplification to voltage signal respectively, then these signals are transferred to by Ethernet 6 and analyze display terminal 5;
(3) analyze display terminal 5 according to the magnetic induction density above the Calculation of Potential Distribution grounding grids above grounding grids, described magnetic induction density calculates formula and is
In formula, f is Injection Current frequency, and N is the detecting coil number of turn, and S is detecting coil cross-sectional area, A
wfor data collector 4 gain.Herein, f
c=65Hz; N=350; S=6.4 × 10
-3m
2; A=1;
(4) analyze display terminal 5 according to the topological structure of grounding net of transformer substation and Current injection points, use numerical computation method to calculate the earth's surface magnetic induction density of grounding net of transformer substation.
(5) analyze display terminal 5 the calculated results of ground surface magnetic induction density above grounding grids and Actual measurement result are compared.To same earth conductor, draw the magnetic induction density curve of the calculated results above this section of conductor and the magnetic induction density curve of Actual measurement result respectively, and calculate the degree of deviation of these two curves.If the magnetic induction density curve degree of deviation of certain earth conductor is greater than 20%, and the magnetic induction density curve degree of deviation of its adjacent parallel conductors is greater than 5%, then judge that this earth conductor exists corrosion failure; If the magnetic induction density of certain earth conductor almost reduces to 0, and there is not significant change in the magnetic induction density being attached thereto conductor, then judge that this conductor exists fracture defect; If the magnetic induction density curve degree of deviation of the many conductors be connected with certain node is all greater than 50%, then judge that this node disconnects.
That enumerates it should be noted that above is only specific embodiment of the utility model, and obvious the utility model is not limited to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed in the utility model or associates, protection domain of the present utility model all should be belonged to.
Claims (5)
1., based on a grounding net of transformer substation corrosion detection system for earth's surface magnetic induction density, it is characterized in that, comprising:
One current injection device, it is connected with arbitrary accessible node of grounded screen;
One signal measurement apparatus, it is positioned at measures directly over conductor;
One data collector, it is connected with signal measurement apparatus;
One signal analysis display terminal, it is connected with data collector.
2. a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density according to claim 1, it is characterized in that, described current injection device comprises:
One current signal generator;
One coupling transformer, it is connected with current signal generator.
3. a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density according to claim 1, it is characterized in that, described data collector comprises:
One voltage signal filtering circuit, it is connected with signal measurement apparatus;
One voltage signal conditioning chip, it is connected with voltage signal filtering circuit;
One communication chip, it is connected with voltage signal conditioning chip and signal analysis display terminal respectively.
4. a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density according to claim 3, it is characterized in that, described voltage signal filtering circuit is double-T shaped power frequency notch filter.
5. a kind of grounding net of transformer substation corrosion detection system based on earth's surface magnetic induction density according to claim 1 or 3, be is characterized in that, be connected between described data collector and described signal analysis display terminal by Ethernet.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021953A (en) * | 2015-06-10 | 2015-11-04 | 国网上海市电力公司 | A transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity |
| CN105676050A (en) * | 2016-01-19 | 2016-06-15 | 大唐哈密风电开发有限公司 | Grounding conductor detection system and method |
| CN106597221A (en) * | 2016-12-15 | 2017-04-26 | 中国科学院沈阳自动化研究所 | Ground grid fault diagnosis method and system |
| CN106855602A (en) * | 2016-12-15 | 2017-06-16 | 中国科学院沈阳自动化研究所 | The detector for magnetic field and method of a kind of grounding grids |
-
2015
- 2015-06-10 CN CN201520398613.5U patent/CN204679586U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021953A (en) * | 2015-06-10 | 2015-11-04 | 国网上海市电力公司 | A transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity |
| CN105021953B (en) * | 2015-06-10 | 2018-03-16 | 国网上海市电力公司 | Grounding net of transformer substation corrosion detection system and method based on earth's surface magnetic induction intensity |
| CN105676050A (en) * | 2016-01-19 | 2016-06-15 | 大唐哈密风电开发有限公司 | Grounding conductor detection system and method |
| CN106597221A (en) * | 2016-12-15 | 2017-04-26 | 中国科学院沈阳自动化研究所 | Ground grid fault diagnosis method and system |
| CN106855602A (en) * | 2016-12-15 | 2017-06-16 | 中国科学院沈阳自动化研究所 | The detector for magnetic field and method of a kind of grounding grids |
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