CN202075207U - Corrosion detection sensor for grounding downlead of grounding grid - Google Patents
Corrosion detection sensor for grounding downlead of grounding grid Download PDFInfo
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- CN202075207U CN202075207U CN2011200372006U CN201120037200U CN202075207U CN 202075207 U CN202075207 U CN 202075207U CN 2011200372006 U CN2011200372006 U CN 2011200372006U CN 201120037200 U CN201120037200 U CN 201120037200U CN 202075207 U CN202075207 U CN 202075207U
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- detection sensor
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- auxiliary electrode
- tubular cavity
- cylindrical shell
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- 230000007797 corrosion Effects 0.000 title claims abstract description 48
- 238000005260 corrosion Methods 0.000 title claims abstract description 48
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 239000002689 soil Substances 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 18
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 9
- 230000008595 infiltration Effects 0.000 claims description 8
- 238000001764 infiltration Methods 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000007799 cork Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 238000002848 electrochemical method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 5
- 238000010277 constant-current charging Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000012031 short term test Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model provides a corrosion detection sensor for a grounding downlead of a grounding grid. The corrosion detection sensor comprises a columnar shell, a reference electrode and an auxiliary electrode, wherein one side of the columnar shell is provided with at least one reference electrode hole and one auxiliary electrode hole; the reference electrode is arranged inside the columnar shell and is used for detecting the corrosion potential of metal to be detected in soil through the reference electrode hole; and the auxiliary electrode is arranged inside the columnar shell and constitutes an electric-conducting loop together with the soil and a metal electrode of a ground grid to be detected through the auxiliary electrode hole. The corrosion detection sensor is used for rapidly detecting and evaluating the corrosion degree of the ground grid by using an electrochemical method.
Description
Technical Field
The utility model discloses a power plant and transformer substation's ground net corrosion state detection technology, especially about the ground net corrosion state detection technology who has used the electrochemistry to detect, specific saying is a ground net ground connection downlead corrodes and detects sensor.
Background
The transformer substation grounding grid is a safety measure adopted by an electric device of a power system for preventing the safety of people and equipment from being endangered by lightning stroke or grounding short circuit current, and has important significance for the safe operation of a power grid. However, the corrosion of the grounding grid reduces the section of the grounding body, even breaks, so that the grounding performance of the grounding grid is poor, the thermal stability cannot meet the requirement, the grounding grid is burnt by circuit current, high potential difference occurs in a transformer substation, damage accidents of other main equipment are caused, and the personal safety is also endangered.
In the prior art, the detection of the grounding network is mainly performed by a physical method, which mainly includes: (1) the grounding resistance of the grounding network is measured, but if the grounding resistance is found to be unqualified, only the electrical connection fault point or corrosion section of the grounding network is searched through excavation, so the grounding resistance measurement of the grounding network has blindness, large workload and slow speed and is limited by field operation. (2) Contact and step voltage measurements, but they do not find a section of the grid where severe corrosion has occurred without fracturing. (3) The method requires accurate knowledge of the structure of the grounding grid, provides an exact mathematical model on the basis, analyzes and calculates measured data points according to the mathematical model to obtain the actual resistance value of each section of grounding grid conductor, thereby showing that more factors influence the accuracy of the measurement result of the method and having certain limitation on the corrosion diagnosis of the old grounding grid running for years.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a ground net ground connection downlead corrodes detection sensor for utilize electrochemical method to carry out short-term test and evaluation to the degree of corrosion of ground net.
The utility model aims at providing a ground net ground connection downlead corrosion detection sensor, this sensor includes: the electrode assembly comprises a cylindrical shell, wherein one side of the cylindrical shell is provided with at least one reference electrode hole and one auxiliary electrode hole; the reference electrode is arranged in the cylindrical shell and detects the corrosion potential of the detected metal in the soil through the reference electrode hole; and the auxiliary electrode is arranged in the columnar shell and forms a conductive loop with the soil and the metal electrode of the grounding network to be detected through the auxiliary electrode hole.
The reference electrode includes: the insulating tubular cavity is used for storing a copper sulfate solution; the infiltration plug is used for plugging one end of the insulating tubular cavity, and the copper sulfate solution seeps out through the infiltration plug; the sealing plug is used for plugging the other end of the insulating tubular cavity; and the copper wire is inserted into the copper sulfate solution in the insulating tubular cavity and is led out of the cylindrical shell through the sealing plug.
The insulating tubular cavity of the reference electrode is a PVC pipe, and one end of a permeation plug of the PVC pipe faces to and is close to the reference electrode hole.
The cylindrical shell includes: an insulating cylindrical shell 100, an insulating tapered front end 110 and an insulating cap 109; wherein, the insulation conical front end 110 is detachably connected with the insulation cylindrical shell body 100; the insulation cap 109 is detachably connected with the insulation cylindrical shell 100.
The reference electrode includes: an insulating tubular cavity 103 for storing a copper sulfate solution 104; a permeable plug 105 for plugging one end of the insulating tubular cavity 103, wherein the copper sulfate solution 104 seeps out through the permeable plug 105; a sealing plug 106 for sealing the other end of the insulating tubular cavity 103; a copper wire 101, wherein the copper wire 101 is inserted into a copper sulfate solution 104 in an insulating tubular cavity 103 and is led out through a sealing plug 106.
The auxiliary electrode includes: a metal electrode 107 fixed to the insulating cylindrical case 100 and covering the auxiliary electrode hole; the auxiliary electrode lead 102 is connected to the auxiliary electrode 107.
The infiltration plug is a cork plug or an infiltration ceramic plug.
The insulating tubular cavity 103 is a polyethylene plastic tube.
One side of the shell is provided with three reference electrode holes and an auxiliary electrode hole; and, the sensor includes: and the three reference electrodes are all arranged in the cylindrical shell and detect the corrosion potential of the detected metal in the soil through the corresponding reference electrode holes.
The reference electrode and the auxiliary electrode are fixed by gel filled in the columnar shell; and the reference electrode hole and the auxiliary electrode hole are filled with gel.
The beneficial effects of the utility model reside in that, adopt the test of the single reference electrode or many reference electrodes of side trompil, understand the distribution characteristic of electric current, delimit the test effective area. The corrosion condition of the down lead of the grounding grid can be effectively detected, and data of the influence of soil on the corrosion condition of the down lead of the grounding grid can be obtained. And effectively evaluating the corrosion condition of the grounding down lead of the grounding grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a structural diagram of a corrosion detection sensor for a grounding down lead of a grounding grid according to an embodiment of the present invention;
fig. 2 is the utility model discloses a ground net ground connection downlead corrosion detection sensor structure sketch map with three reference electrode.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the corrosion detection sensor for the grounding down lead of the grounding grid of the present embodiment includes: a cylindrical housing 100, one side of the cylindrical housing 100 is provided with at least one reference electrode hole 105 and one auxiliary electrode hole 108; the reference electrode is arranged in the columnar shell 100 and detects the corrosion potential of the detected metal in the soil through the reference electrode hole 105; and the auxiliary electrode is arranged in the columnar shell 100 and forms a conductive loop with the soil and the metal electrode of the grounding network to be detected through the auxiliary electrode hole 108.
The reference electrode includes: an insulating tubular cavity 103 for storing a copper sulfate solution 104; a penetration plug for plugging one end of the insulating tubular cavity 103, wherein the copper sulfate solution 104 seeps out through the penetration plug and the reference electrode hole 105; a sealing plug 106 for sealing the other end of the insulating tubular cavity 103; and a copper wire 101, wherein the copper wire 101 is inserted into a copper sulfate solution 104 in the insulating tubular cavity 103 and is led out of the cylindrical shell through a sealing plug 106. The insulated tubular cavity 103 of the reference electrode is a PVC tube with the permeate plug end of the PVC tube facing and proximate to the reference electrode aperture 105.
The cylindrical casing 100 includes: an insulating cylindrical shell, an insulating tapered front end 110 and an insulating cap 109; wherein the insulating conical front end 110 is detachably connected with the insulating cylindrical shell body; the insulation cap 109 is detachably connected with the insulation cylindrical shell body.
The reference electrode includes: an insulating tubular cavity 103 for storing a copper sulfate solution 104; a permeable plug for plugging one end of the insulating tubular cavity 103, through which the copper sulfate solution 104 seeps; a sealing plug 106 for sealing the other end of the insulating tubular cavity 103; a copper wire 101, wherein the copper wire 101 is inserted into a copper sulfate solution 104 in an insulating tubular cavity 103 and is led out through a sealing plug 106.
The auxiliary electrode includes: a metal electrode 107 fixed on the insulating cylindrical shell and covering the auxiliary electrode hole 108; the auxiliary electrode lead 102 is connected to the auxiliary electrode 107.
The infiltration plug is a cork plug or an infiltration ceramic plug. The insulating tubular cavity 103 is a polyethylene plastic tube. The reference electrode and the auxiliary electrode are fixed by gel filled in the cylindrical case 100; and the reference electrode hole 105 and the auxiliary electrode hole 108 are filled with gel.
The reference electrode and the auxiliary electrode with holes on the side surface of the sensor are adopted to know the distribution characteristics of current and define the effective area for testing. The corrosion condition of the down lead of the grounding grid can be effectively detected, and data of the influence of soil on the corrosion condition of the down lead of the grounding grid can be obtained. And effectively evaluating the corrosion condition of the grounding down lead of the grounding grid.
Example 2
As shown in fig. 2, the corrosion detection sensor for the grounding down lead of the grounding grid of the present embodiment includes: a cylindrical case 200, one side of the cylindrical case 200 being provided with three reference electrode holes (203a, 203b and 203c) and one auxiliary electrode hole 204; reference electrodes, three of which are all arranged in the columnar shell 200 and detect the corrosion potential of the detected metal in the soil through the corresponding reference electrode holes (203a, 203b and 203 c); and the auxiliary electrode is arranged in the columnar shell 200 and forms a conductive loop with the soil and the metal electrode of the grounding network to be detected through the auxiliary electrode hole 204.
The reference electrode and the auxiliary electrode are fixed by the gel filled in the cylindrical case 200; and the reference electrode hole (203a, 203b and 203c) and the auxiliary electrode hole 204 are filled with gel.
In fig. 2, the three reference electrode apertures are equally spaced. The reference electrode hole and the small current limiting hole are filled with fillers which are conductive gel and play roles in ion conduction and protection of the current limiting hole; the front end of the reference electrode penetrates through the reference electrode hole and is inserted into the filler, and the conductive gel of the filler is in full contact with the soil so as to detect the corrosion potential of the detected metal in the soil; the auxiliary electrode is arranged in the cylindrical shell, and the auxiliary electrode, soil and a metal electrode formed by the buried metal to be detected form a conductive loop.
The method for detecting corrosion of the buried metal of the sensor comprises the following steps: the method comprises the steps of inserting a sensor into soil, enabling the soft filler conductive gel at the side end of the funnel-shaped protection shell to be in full contact with the soil, testing by a constant current method during operation, obtaining a constant current charging curve by a constant current step method, collecting experimental data by a data collector, carrying out wavelet transformation analysis by Matlab software, filtering out noise, obtaining the constant current charging curve, and analyzing by other software to obtain corrosion condition information of the buried metal and soil conductivity in the soil.
The sensor is used for detecting, the sensor is inserted into soil, the soft filler conductive gel at the side end of the funnel-shaped protection shell is made to be fully contacted with the soil, during operation, a constant current method is used for testing, a constant current charging curve is obtained through a constant current step method, experimental data are collected through a data collector, Matlab software is used for carrying out wavelet transformation analysis, noise is filtered, the obtained constant current charging curve is analyzed through Kohonen neural network or curve fitting, and finally corrosion condition information of the buried metal is obtained.
And (4) adopting a plurality of reference electrodes for testing, knowing the distribution characteristics of current and defining the testing effective area. The corrosion condition of the down lead of the grounding grid can be effectively detected, and data of the influence of soil on the corrosion condition of the down lead of the grounding grid can be obtained. And evaluating the corrosion condition of the grounding down lead of the grounding grid.
The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The utility model provides a ground net ground connection downlead corrosion detection sensor, characterized by, the sensor includes:
the electrode assembly comprises a cylindrical shell, wherein one side of the cylindrical shell is provided with at least one reference electrode hole and one auxiliary electrode hole;
the reference electrode is arranged in the cylindrical shell and detects the corrosion potential of the metal to be detected in the soil through the reference electrode hole;
and the auxiliary electrode is arranged in the cylindrical shell and forms a conductive loop with the soil and the metal electrode of the grounding network to be detected through the auxiliary electrode hole.
2. The grounded down conductor corrosion detection sensor of claim 1, wherein the reference electrode comprises:
the insulating tubular cavity is used for storing a copper sulfate solution;
the infiltration plug is used for plugging one end of the insulating tubular cavity, and the copper sulfate solution seeps out through the infiltration plug;
the sealing plug is used for sealing the other end of the insulating tubular cavity;
and the copper wire is inserted into the copper sulfate solution in the insulating tubular cavity and is led out of the cylindrical shell through the sealing plug.
3. The grounding grid down conductor corrosion detection sensor of claim 2, wherein the insulating tubular cavity of the reference electrode is a PVC pipe, and one end of the PVC pipe is exposed towards and proximate to the reference electrode hole.
4. The grounded down conductor corrosion detection sensor of claim 1, wherein the cylindrical housing comprises:
an insulating cylindrical shell body, an insulating conical front end (110) and an insulating cap (109); wherein,
the insulation conical front end (110) is detachably connected with the insulation cylindrical shell body;
the insulation cap (109) is detachably connected with the insulation cylindrical shell body.
5. The grounded down conductor corrosion detection sensor of claim 4, wherein the reference electrode comprises:
an insulating tubular cavity (103) for storing a copper sulfate solution (104);
a permeable plug for plugging one end of the insulating tubular cavity (103), through which the copper sulfate solution (104) seeps;
a sealing plug (106) for sealing off the other end of the insulating tubular cavity (103);
the copper wire (101), the copper wire (101) is inserted into the copper sulfate solution (104) in the insulating tubular cavity (103) and is led out through the sealing plug (106).
6. The grounding grid down conductor corrosion detection sensor of claim 4, wherein the auxiliary electrode comprises:
a metal electrode (107) fixed on the insulating cylindrical shell and covering the auxiliary electrode hole;
and an auxiliary electrode lead (102) connected to the auxiliary electrode (107).
7. The grounding grid down conductor corrosion detection sensor of claim 5, wherein the porous plug is a cork plug or a porous ceramic plug.
8. The grounding grid down conductor corrosion detection sensor of claim 5, wherein the insulating tubular cavity (103) is a polyethylene plastic tube.
9. The grounding grid down lead corrosion detection sensor of claim 1, wherein one side of the cylindrical housing has three reference electrode holes and one auxiliary electrode hole; and, the sensor includes:
and the three reference electrodes are all arranged in the cylindrical shell and detect the corrosion potential of the detected metal in the soil through the corresponding reference electrode holes.
10. A grounded down conductor corrosion detection sensor according to claim 1 or 9 wherein said reference electrode and auxiliary electrode are fixed by a gel filled in said cylindrical housing; and the reference electrode hole and the auxiliary electrode hole are filled with gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200372006U CN202075207U (en) | 2011-02-12 | 2011-02-12 | Corrosion detection sensor for grounding downlead of grounding grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200372006U CN202075207U (en) | 2011-02-12 | 2011-02-12 | Corrosion detection sensor for grounding downlead of grounding grid |
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| Publication Number | Publication Date |
|---|---|
| CN202075207U true CN202075207U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200372006U Expired - Lifetime CN202075207U (en) | 2011-02-12 | 2011-02-12 | Corrosion detection sensor for grounding downlead of grounding grid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575766A (en) * | 2013-10-22 | 2014-02-12 | 国家电网公司 | Grounding body corrosion rate measurement device of grounding grid |
| CN103630487A (en) * | 2012-08-27 | 2014-03-12 | 中国科学院金属研究所 | Accelerated corrosion test device for nonferrous metal soil |
| CN105173270A (en) * | 2015-09-06 | 2015-12-23 | 苏州宏奇锐自动化有限公司 | Automatic package stream line |
| CN110567869A (en) * | 2019-10-09 | 2019-12-13 | 云南电网有限责任公司大理供电局 | Method for judging local corrosion of grounding grid through corrosion potential distribution |
| CN111579476A (en) * | 2020-06-03 | 2020-08-25 | 福建九有建设发展有限公司 | Transformer substation grounding grid corrosion detection system and method |
-
2011
- 2011-02-12 CN CN2011200372006U patent/CN202075207U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630487A (en) * | 2012-08-27 | 2014-03-12 | 中国科学院金属研究所 | Accelerated corrosion test device for nonferrous metal soil |
| CN103575766A (en) * | 2013-10-22 | 2014-02-12 | 国家电网公司 | Grounding body corrosion rate measurement device of grounding grid |
| CN105173270A (en) * | 2015-09-06 | 2015-12-23 | 苏州宏奇锐自动化有限公司 | Automatic package stream line |
| CN110567869A (en) * | 2019-10-09 | 2019-12-13 | 云南电网有限责任公司大理供电局 | Method for judging local corrosion of grounding grid through corrosion potential distribution |
| CN111579476A (en) * | 2020-06-03 | 2020-08-25 | 福建九有建设发展有限公司 | Transformer substation grounding grid corrosion detection system and method |
| CN111579476B (en) * | 2020-06-03 | 2023-02-10 | 福建九有建设发展有限公司 | Transformer substation grounding grid corrosion detection system and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD Effective date: 20131031 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD. Effective date: 20131031 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100045 XICHENG, BEIJING TO: 100031 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20131031 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: North China Electrical Power Research Institute LLC Address before: 100045 Beijing city Xicheng District Fuxingmenwai Nan Xiang Di Zang an 1 Patentee before: North China Electrical Power Research Institute LLC |
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| CX01 | Expiry of patent term |
Granted publication date: 20111214 |
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| CX01 | Expiry of patent term |