CN104729984A - Composite monitoring sensor for monitoring grounding grid corrosion - Google Patents
Composite monitoring sensor for monitoring grounding grid corrosion Download PDFInfo
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- CN104729984A CN104729984A CN201510129791.2A CN201510129791A CN104729984A CN 104729984 A CN104729984 A CN 104729984A CN 201510129791 A CN201510129791 A CN 201510129791A CN 104729984 A CN104729984 A CN 104729984A
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Abstract
The invention discloses a composite monitoring sensor for monitoring grounding grid corrosion. The composite monitoring sensor comprises an auxiliary electrode, a guard ring electrode, a solid reference electrode, a stainless steel cylinder body and a stainless steel sleeve, wherein the auxiliary electrode is fixed on the inner wall of the stainless steel cylinder body; the guard ring electrode is fixed on the outer wall of the stainless steel cylinder body; the solid reference electrode is fixed in the stainless steel cylinder body by a reference electrode fixing ring; the auxiliary electrode, the guard ring electrode and the solid reference electrode are respectively led out by a single-core lead; each single-core lead is sleeved with a shielding soft sleeve; the shielding soft sleeves penetrate out of the stainless steel sleeve and are sealed by waterproof joints; a plurality of through holes are formed along the circumferential direction of the stainless steel cylinder body. The composite monitoring sensor is capable of accurately measuring the corrosion rate of a grounding grid.
Description
Technical field
The present invention relates to transformer station grounding network on-line corrosion monitoring field, be specifically related to a kind of ground net corrosion combined monitoring sensor, for the monitoring of ground net corrosion speed.
Background technology
The corrosion of grounded screen in soil belongs to galvanic corrosion, and multiple electrochemical method can be adopted to carry out corrosion monitoring, comprises linear polarization method, condition of constant Current step method and AC impedence method etc.But current most of monitoring method all needs built-in metal test piece in soil, namely can only measure the corrosivity of soil, the corrosion rate of earth mat self directly can not be measured.If using tested earth mat metallic object as the working electrode in activation polarization, then must will to polarization of electrode current limit in certain area, namely corrosion sensor need limit polarization current in the agreement area of earth mat metal surface, otherwise, the uncertainty of polarized metallic counterpoise area, the corrosion rate measured will be caused to produce larger error, and measurement result is inaccurate.
Such as publication number is 101315403, publication date is on Dec 3rd, 2008, patent name is adopt aperture current limliting sensor in a kind of ground net corrosion detection method and system, auxiliary electrode workpiece pole being applied to polarization is enclosed in dielectric chamber, make polarization current can only flow to grounded screen (working electrode) by aperture, achieve the restriction of grounded screen polarization area.But, aperture current limliting sensor in this patent is owing to have employed hermetically-sealed construction, when aperture restrictor is pressed on grounded screen steel plate, restrictor inside can be caused to form one closed " dead band ", its internal environment and sensor external environment define physical isolation, along with time lengthening, the moisture of sensor internal soil, dissolved oxygen DO, microorganism and content of mineral substances etc. all can present the difference larger with external environment condition because of inaccessible environment.This is for medium-term and long-term corrosion monitoring, and its corrosion rate measurement result progressively will lose reference significance.In addition this restrictor cannot realize seamless contact with grounded screen, and portion of electrical current must be had to be scattered and disappeared by gap, and cause the corrosion electric current density measured to increase, corrosion rate measured value is much larger than actual value.
Therefore, we are in the urgent need to a kind of new ground net corrosion combined monitoring sensor, with the corrosion rate of Measurement accuracy grounded screen.
Summary of the invention
The object of the present invention is to provide a kind of ground net corrosion combined monitoring sensor of energy Measurement accuracy ground net corrosion speed, is the ground net corrosion combined monitoring sensor of a kind of integrated aperture current limliting and ring protectiving electrode restriction of current technology.
The technical solution used in the present invention is:
A kind of ground net corrosion combined monitoring sensor, it comprises auxiliary electrode, ring protectiving electrode, solid reference electrode, stainless steel cylinder, stainless steel sleeve pipe;
Described auxiliary electrode is fixed on stainless steel cylinder inwall, and described ring protectiving electrode is fixed on stainless steel cylinder outer wall, and described solid reference electrode is fixed in stainless steel cylinder by contrast electrode set collar;
Described auxiliary electrode, ring protectiving electrode, solid reference electrode are drawn respectively by single condctor, and are arranged with shielding teleflex outside described single condctor; Described shielding teleflex passes stainless steel sleeve pipe, and is sealed by water joint;
The circumferencial direction of described stainless steel cylinder is provided with multiple through hole;
The hollow part of the bottom of described stainless steel cylinder is current limliting aperture.
By such scheme, the external diameter of described ring protectiving electrode is equal with the external diameter of stainless steel cylinder.
By such scheme, the center of described ring protectiving electrode and the center superposition of auxiliary electrode.
By such scheme, described auxiliary electrode, ring protectiving electrode are positioned at the middle and lower part of stainless steel cylinder.
By such scheme, the bottom of described stainless steel cylinder reduces tapered gradually.
By such scheme, the internal diameter of described stainless steel cylinder is 10mm ~ 30mm, and the external diameter of described auxiliary electrode is identical with the internal diameter of stainless steel cylinder, and the height of described auxiliary electrode is 10mm ~ 20mm; The internal diameter of ring protectiving electrode is 40 ~ 50mm, is highly 10mm ~ 20mm.
The present invention is based on aperture current limiting technique, polarization current can be constrained in the restriction position on grounded screen steel plate, by retaining ring restriction of current circuit, the disperse electric current that aperture gap is flowed out is retrained, and can measure the corrosion rate of grounded screen more accurately.This sensor is except forming except galvanochemistry three electrode measurement system with tested earth mat, also there is current limit effect, be limited to sensor front end aperture in the projecting plane of ground net surface by polarization current, this sensor have employed aperture current limliting and ring protectiving electrode two kinds of methods are dispersed to retrain polarization current for this reason.Shielded tube is sealed by PG water joint, prevents moisture from infiltrating in stainless steel cylinder.The hollow part of stainless steel cylinder bottom is current limliting aperture.Stainless steel cylinder circumferencial direction has multiple through hole, is generally 4 ~ 8 through holes, for the mass exchange of the inner soil of stainless steel cylinder with outside soil, ensures the consistance of inside and outside corrosion environment, to guarantee the accuracy of measurement.
Contrast electrode in the present invention is the important devices in aperture current limliting electrode, and for ground net corrosion monitoring, long-life of contrast electrode, chemically-resistant pollute and the aspect such as biodeterioration has higher requirement.Conventional contrast electrode in it reference solution normal different from the composition of studied system solution, thus inevitably cause liquid potential, thus generation error.And solution electrode directly contacts may produce cross staining with soil, also there is the problem of electrode structural designs and mechanical seal in solution contrast electrode in addition.Soil environment and ooze easily make porous ceramics block.Solid reference electrode without liquid potential, resistance to immersion, long service life, lower to the environment for use susceptibility of harshness, on scientific research and engineering use, all demonstrate obvious advantage.Therefore contrast electrode of the present invention adopts solid reference electrode (as saturated copper/copper sulfate reference electrode, silver/silver chloride electrode or saturated potassium chloride mercurous chloride electrode etc.).
When this ground net corrosion combined monitoring sensor vertical is positioned on grounded screen steel bar, auxiliary electrode provides the steel plate polarization current on projecting plane, aperture aperture, ring protectiving electrode then provides the current polarizing outside aperture, by this kind of design can better by restriction of current in aperture, polarization current is limited in below auxiliary electrode projected area, can be used for the Measurement accuracy of grounded screen bulk erosion speed.
The present invention is based on the integrated of aperture current limliting and retaining ring restriction of current technology, can by polarization current exact constraint in orifice region, thus measurement result is more accurate; The present invention is provided with the through hole of the ion-exchange for soil inside and outside sensor in the side of stainless steel cylinder, can ensure there is good mass exchange between soil in sensor and external environment condition, ensure that the consistance of sensor internal and external environment, thus its measurement result can more truly reflect Grounding Grid state.
Accompanying drawing explanation
Fig. 1 is the structural representation of ground net corrosion combined monitoring sensor of the present invention.
Fig. 2 is restriction of current mode of the present invention diagram.
In figure: 1, PG water joint; 2, stainless steel sleeve pipe; 3, teleflex is shielded; 4, solid reference electrode; 5, contrast electrode set collar; 6, single condctor; 7, through hole; 8, stainless steel cylinder; 9, auxiliary electrode; 10, ring protectiving electrode; 11, aperture, 12, grounded screen steel plate, 13, earth mat draws and reach the standard grade.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
Embodiment 1
See Fig. 1 and Fig. 2, a kind of ground net corrosion combined monitoring sensor, it comprises auxiliary electrode (CE) 9, ring protectiving electrode (GE) 10, solid reference electrode (RE) 4, stainless steel cylinder 8, stainless steel sleeve pipe 2; The internal diameter of described auxiliary electrode 9 is 10mm, highly for 10mm, external diameter are 14mm, is fixed on stainless steel cylinder 8 inwall; The external diameter of described ring protectiving electrode 10 is 50mm, internal diameter is 40mm, highly for 12mm, be fixed on stainless steel cylinder 8 outer wall, and the diameter of described solid reference electrode 4 is 8mm, highly is 135mm, is fixed in stainless steel cylinder 8 by contrast electrode set collar 5; Described auxiliary electrode 9, ring protectiving electrode 10, solid reference electrode 4 are drawn respectively by single condctor 6, and are arranged with shielding teleflex 3 outside described single condctor 6; Described shielding teleflex 3 passes stainless steel sleeve pipe 2, and is sealed by PG water joint 1; Described stainless steel cylinder 8 be circumferentially evenly laid with 4 through holes 7, for the mass exchange of the inner soil of stainless steel cylinder 8 and outside soil, ensure the consistance of inside and outside corrosion environment; The hollow part of the bottom of described stainless steel cylinder 8 is current limliting aperture 11.
Conveniently install and reduce the impact of external environment condition on test result, the external diameter of described auxiliary electrode 9 is identical with the internal diameter of stainless steel cylinder 8, and the external diameter of described ring protectiving electrode 10 is identical with the external diameter of stainless steel cylinder 8.
Installing for the ease of sensor, can be designed to reduce gradually tapered by the bottom of stainless steel cylinder 8; In order to make test result accurate, by the center superposition of the center of ring protectiving electrode 10 and auxiliary electrode 9, auxiliary electrode 9 and ring protectiving electrode 10 are placed in the middle and lower part of stainless steel cylinder 8.
During in-site installation sensor, ground net corrosion combined monitoring sensor is inserted in on-site soil, and be vertically fixed on grounded screen steel plate 12, see Fig. 2.Working electrode in the present invention is grounded screen steel plate 12,13 to be connected with working electrode lead-in wire by drawing to reach the standard grade.Auxiliary electrode 9(CE) will the polarization current of grounded screen steel plate 12 in projecting plane, aperture 11 aperture be provided.Due to certain gap (as uneven in earth mat or soil settlement causes) can be there is between aperture and grounded screen steel plate 12, one part of current can be caused to flow to outside orifice region, rely on aperture current limliting if simple, the corrosion rate of measurement can be caused bigger than normal.The restriction of current that aperture disperse can go out by the about beam current that ring protectiving electrode (GE) 10 provides, in aperture projecting plane, also can prevent from exhaling polarization current in the through hole 7 of the side of stainless steel cylinder 8; Finally, all electric currents flowing to grounded screen to be reached the standard grade and working electrode lead-in wire (WE) is got back in corrosion monitor by drawing, thus can more Measurement accuracy ground net corrosion speed.In addition, owing in aperture 11 being the system of a sealing, if aperture 11 is tightly fitted in grounded screen steel plate 12 surface, then in hole, soil cannot lose material and exchange heat with outside soil, define isolated " dead band ", such corrosion rate metering system obviously can not reflect the corrosion condition to grounded screen in outside soil dry-wet alternation procedure.In order to avoid formation dead band, inside, must at the side-wall hole of stainless steel cylinder, to ensure the mass exchange inside and outside hole.
Embodiment 2
With embodiment 1 difference be: the external diameter of described auxiliary electrode is 16mm, is highly 14mm, and the external diameter of described ring protectiving electrode is 46mm, is highly 14mm, and the diameter of described solid reference electrode (RE) is 10mm, is highly 140mm.CE, GE and RE draw respectively by single condctor, and three single condctors are drawn by shielding teleflex.The circumferencial direction of stainless steel cylinder has 6 through holes, is uniformly distributed on stainless steel cylinder, to ensure the consistance of inside and outside corrosion environment.
The present invention can according to on-site actual situations, the size of adjustment sensor, comprises external diameter and the sensor entire length of ﹑ auxiliary electrical polar circle ring straight footpath, straight footpath, little Kong ﹑ auxiliary electrical high degree ﹑ ring protectiving electrode straight footpath ﹑ ring protectiving electrode height degree ﹑ sensor.
Claims (6)
1. a ground net corrosion combined monitoring sensor, is characterized in that: it comprises auxiliary electrode, ring protectiving electrode, solid reference electrode, stainless steel cylinder, stainless steel sleeve pipe;
Described auxiliary electrode is fixed on stainless steel cylinder inwall, and described ring protectiving electrode is fixed on stainless steel cylinder outer wall, and described solid reference electrode is fixed in stainless steel cylinder by contrast electrode set collar;
Described auxiliary electrode, ring protectiving electrode, solid reference electrode are drawn respectively by single condctor, and are arranged with shielding teleflex outside described single condctor; Described shielding teleflex passes stainless steel sleeve pipe, and is sealed by water joint;
The circumferencial direction of described stainless steel cylinder is provided with multiple through hole.
2. ground net corrosion combined monitoring sensor as claimed in claim 1, is characterized in that: the external diameter of described ring protectiving electrode is equal with the external diameter of stainless steel cylinder.
3. ground net corrosion combined monitoring sensor as claimed in claim 1 or 2, is characterized in that: the center of described ring protectiving electrode and the center superposition of auxiliary electrode.
4. ground net corrosion combined monitoring sensor as claimed in claim 3, is characterized in that: described auxiliary electrode, ring protectiving electrode are positioned at the middle and lower part of stainless steel cylinder.
5. ground net corrosion combined monitoring sensor as claimed in claim 1, is characterized in that: the bottom of described stainless steel cylinder reduces tapered gradually.
6. ground net corrosion combined monitoring sensor as claimed in claim 1, it is characterized in that: the internal diameter of described stainless steel cylinder is 10mm ~ 30mm, the external diameter of described auxiliary electrode is identical with the internal diameter of stainless steel cylinder, and the height of described auxiliary electrode is 10mm ~ 20mm; The internal diameter of ring protectiving electrode is 40 ~ 50mm, is highly 10mm ~ 20mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791030A (en) * | 2021-09-13 | 2021-12-14 | 国网山东省电力公司电力科学研究院 | Soil corrosion in-situ detection sensor for buried metal component |
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| CN103968972A (en) * | 2014-04-30 | 2014-08-06 | 歌尔声学股份有限公司 | Pressure sensor |
| CN104062350A (en) * | 2014-05-07 | 2014-09-24 | 西安交通大学 | Multi-electrode microsensor for detecting copper metal vapor concentration |
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2015
- 2015-03-24 CN CN201510129791.2A patent/CN104729984B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101315403A (en) * | 2007-05-29 | 2008-12-03 | 华北电力科学研究院有限责任公司 | Ground net corrosion detection method and system |
| CN101299018A (en) * | 2007-09-24 | 2008-11-05 | 哈尔滨工业大学 | Complete solid-state beam current type reinforcing steel corrosion monitoring sensor and method for producing the same |
| JP2010060518A (en) * | 2008-09-05 | 2010-03-18 | Kawasaki Heavy Ind Ltd | Corrosion monitoring sensor |
| CN101943655A (en) * | 2010-08-16 | 2011-01-12 | 华中科技大学 | On-line corrosion detector for reinforced concrete and method thereof |
| CN103105355A (en) * | 2011-11-14 | 2013-05-15 | 华北电力科学研究院有限责任公司 | Method and device for detecting corrosion of grounding grid of electric transmission line iron tower |
| CN103968972A (en) * | 2014-04-30 | 2014-08-06 | 歌尔声学股份有限公司 | Pressure sensor |
| CN104062350A (en) * | 2014-05-07 | 2014-09-24 | 西安交通大学 | Multi-electrode microsensor for detecting copper metal vapor concentration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113791030A (en) * | 2021-09-13 | 2021-12-14 | 国网山东省电力公司电力科学研究院 | Soil corrosion in-situ detection sensor for buried metal component |
| CN113791030B (en) * | 2021-09-13 | 2024-05-31 | 国网山东省电力公司电力科学研究院 | In-situ detection sensor for soil corrosion of buried metal component |
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Effective date of registration: 20160622 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Applicant after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant after: Electric Power Research Institute of State Grid Shanxi Power Supply Company Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Applicant before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant before: Electric Power Research Institute of State Grid Shanxi Power Supply Company Applicant before: State Grid Electric Power Research Insititute |
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