CN204679563U - A kind of grounding net of transformer substation corrosion detection system based on surface potential - Google Patents

A kind of grounding net of transformer substation corrosion detection system based on surface potential Download PDF

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Publication number
CN204679563U
CN204679563U CN201520397515.XU CN201520397515U CN204679563U CN 204679563 U CN204679563 U CN 204679563U CN 201520397515 U CN201520397515 U CN 201520397515U CN 204679563 U CN204679563 U CN 204679563U
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China
Prior art keywords
potential
transformer substation
grounding net
corrosion detection
grounded screen
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CN201520397515.XU
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傅晨钊
苏磊
司文荣
陈璐
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State Grid Shanghai Municipal Electric Power Co
East China Power Test and Research Institute Co Ltd
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State Grid Shanghai Municipal Electric Power Co
East China Power Test and Research Institute Co Ltd
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Abstract

The utility model relates to a kind of grounding net of transformer substation corrosion detection system based on surface potential, comprising: a current injection device, and it is connected with the arbitrary accessible node of grounded screen; One potential probes, it is positioned at directly over grounding grids earth's surface; One signal testing module, it is connected with potential probes; One analyzes display terminal, itself and signal testing model calling.Compared with prior art, the utility model has advantages such as ensureing substation safety stable operation.

Description

A kind of grounding net of transformer substation corrosion detection system based on surface potential
Technical field
The utility model relates to a kind of grounding net of transformer substation corrosion detection system, especially relates to a kind of grounding net of transformer substation corrosion detection system based on surface potential.
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 the magnetic induction intensity on the grounded screen earth's surface that this electric current excites, diagnose according to its distribution characteristics to the corrosion failure that grounded screen exists to grounded screen.But the method is subject to the interference of substation field complex electromagnetic environment, and is difficult to accurately judge concrete abort situation, to be corroded but the conductor not yet ruptured also is difficult to make Precise Diagnosis.
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 surface potential is provided, can to grounding net of transformer substation surface potential distribution carry out testing and analysis, 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 surface potential, it is characterized in that, comprising:
One current injection device, it is connected with the 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 by the arbitrary accessible node of grounded screen;
One potential probes, it is positioned at directly over grounding grids earth's surface, for measuring the Potential distribution directly over conductor earth's surface on earth's surface, detects the electric potential signal on earth's surface, and filtering Hz noise;
One signal testing module, it is connected with potential probes, for receiving the electric potential signal of potential probes transmission, carries out filtering and amplification to it, and calculates, stores current potential component corresponding to Injection Current frequency;
One analyzes display terminal, and it is with signal testing model calling, for the potential data that Received signal strength test module transmits.
Described current injection device comprises:
One current signal generator, for providing the Injection Current of grounded screen;
One coupling transformer, it is connected with current signal generator, for receiving Injection Current and exporting with the input current of grounded screen matches impedances to the accessible node of grounded screen.
Described signal testing module comprises:
One voltage signal filtering circuit, it is connected with potential probes, in order to receive the electric potential signal that potential probes exports, and the Hz noise component 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 microprocessor, it is connected with voltage signal conditioning chip, for calculating, storing the surface potential component of signal corresponding to Injection Current frequency;
One communication chip, it, respectively with microprocessor with analyze display terminal and be connected, transfers to analysis display terminal for microprocessor being calculated gained potential data.
Described voltage signal filtering circuit is double-T shaped power frequency notch filter.
Be connected by USB between described signal testing module with analysis display terminal.
Compared with prior art, the utility model detection system, can not excavate in transformer station, under the prerequisite do not had a power failure, overcome the electromagnetic environment interference of substation field complexity, utilize less measuring point can judge the corrosion failure of conductor accurately and effectively, ensure substation safety stable operation; Specifically have the following advantages:
1) select the pulse current injectingt differing from power frequency to grounded screen, utilize the Hz noise component in the pre-filter circuit filtering measurement gained electric potential signal of signal testing module, the interference of complex electromagnetic environment in transformer station can be avoided; Described filtering circuit adopts double-T shaped power frequency notch filter.
2) when measuring surface potential, 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 surface potential in whole grounded screen region, reduce surveying work amount, particularly effective to large-scale grounding network.
Accompanying drawing explanation
Fig. 1 is the grounding net of transformer substation corrosion detection system one-piece construction schematic block diagram of the utility model based on surface potential;
Fig. 2 is the grounded screen model schematic in the utility model embodiment;
Fig. 3 is the physical circuit figure of the utility model for the double-T shaped power frequency notch filter of filtering.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
With certain substation grounding pessimistic concurrency control for subjects, the utility model is described in detail.
The structure of the grounding net of transformer substation corrosion detection system based on surface potential described in the utility model is shown shown in Fig. 1.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.Potential probes 3 is in order to measure surface potential distribution directly over grounded screen 2 conductor.Signal testing module 4 is connected with potential probes 3, receives the electric potential signal that potential probes 3 is transmitted, carries out filtering Hz noise, anti-aliasing filter and amplification respectively to this signal, and calculates, stores surface potential component corresponding to Injection Current frequency.Analyze display terminal 5 to be connected with signal testing module 4, to receive the potential data of adjustable frequency voltage table transmission.Wherein, current injection device 1 comprises current signal generator, to provide 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.Signal testing module 4 comprises voltage signal filtering circuit, and it is connected with potential probes 3, to receive the voltage signal that potential probes 3 is transmitted, 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; Microprocessor, it is connected with voltage signal conditioning chip, calculates, stores the surface potential component corresponding to Injection Current frequency; Communication chip, it is connected by USB with analysis display terminal 5.
The above-mentioned grounding net of transformer substation corrosion detection system based on surface potential 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, measure the surface potential distribution above grounding net of transformer substation conductor by the potential probes 3 being placed on ground surface above grounding net of transformer substation; When choosing measurement point, comprise two conductor end points, six Along ents choosing conductor are measured.
(2) electric potential signal collected is transferred to signal testing module 4, after signal testing module 4 carries out power frequency filtering, anti-aliasing filter and amplification to electric potential signal respectively, calculate and store the current potential component of corresponding Injection Current frequency, then surface potential data being transferred to by USB and analyze display terminal 5.
(3) 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 surface potential of grounding net of transformer substation;
(4) analyze display terminal 5 the calculated results of surface potential above grounding grids and measured result are compared.To same earth conductor, draw the surface potential distribution curve of the calculated results above this section of conductor and the surface potential distribution curve of measured result respectively, if the surface potential that certain conductor exists continuous measuring point increases or reduces simultaneously, then think that the surface potential distribution of this conductor changes.And then filter out all surface potentials and to distribute the conductor segment changed, observe conductor segment position.If wherein some conductor segment is connected to each other formation certain area, then thinks with these conductor segment region memory that is rectangular edges in trouble spot, judge that this region is as fault zone.For the earth conductor in fault zone, calculate the grey absolute correlation degree index ε of surface potential theoretical curves and measured curve above this section of conductor respectively, if the grey absolute correlation degree index of certain section of conductor surface potential curve is less than 0.9, then assert that this section of conductor exists comparatively significantly corrosion failure.
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 surface potential, it is characterized in that, comprising:
One current injection device, it is connected with the arbitrary accessible node of grounded screen;
One potential probes, it is positioned at directly over grounding grids earth's surface;
One signal testing module, it is connected with potential probes;
One analyzes display terminal, itself and signal testing model calling.
2. a kind of grounding net of transformer substation corrosion detection system based on surface potential 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 grounded screen and current signal generator respectively.
3. a kind of grounding net of transformer substation corrosion detection system based on surface potential according to claim 1, it is characterized in that, described signal testing module comprises:
One voltage signal filtering circuit, it is connected with potential probes;
One voltage signal conditioning chip, it is connected with voltage signal filtering circuit;
One microprocessor, it is connected with voltage signal conditioning chip;
One communication chip, it is respectively with microprocessor with analyze display terminal and be connected.
4. a kind of grounding net of transformer substation corrosion detection system based on surface potential 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 surface potential according to claim 1, is characterized in that, is connected between described signal testing module with analysis display terminal by USB.
CN201520397515.XU 2015-06-10 2015-06-10 A kind of grounding net of transformer substation corrosion detection system based on surface potential Active CN204679563U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105652139A (en) * 2015-12-30 2016-06-08 国家电网公司 Method for testing conductivity of grounding grid
CN106950456A (en) * 2017-05-26 2017-07-14 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit
CN107132455A (en) * 2017-05-26 2017-09-05 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method injected based on ground line current

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105652139A (en) * 2015-12-30 2016-06-08 国家电网公司 Method for testing conductivity of grounding grid
CN106950456A (en) * 2017-05-26 2017-07-14 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit
CN107132455A (en) * 2017-05-26 2017-09-05 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method injected based on ground line current
CN107132455B (en) * 2017-05-26 2019-07-05 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method based on ground line current injection
CN106950456B (en) * 2017-05-26 2019-07-26 云南电网有限责任公司电力科学研究院 A kind of grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment

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