CN102494644A - Method for simply detecting thickness of silver coating of high-voltage isolating switch contact - Google Patents
Method for simply detecting thickness of silver coating of high-voltage isolating switch contact Download PDFInfo
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- CN102494644A CN102494644A CN2011103582161A CN201110358216A CN102494644A CN 102494644 A CN102494644 A CN 102494644A CN 2011103582161 A CN2011103582161 A CN 2011103582161A CN 201110358216 A CN201110358216 A CN 201110358216A CN 102494644 A CN102494644 A CN 102494644A
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Abstract
The invention discloses a method for simply detecting thickness of the silver coating of a high-voltage isolating switch contact, which comprises the following steps of: (1), measuring different positions of the silver coating of the high-voltage isolating switch contact by using a probe of an X fluorescence alloy analyzer to obtain a set of measurement data, which at least comprises three data values; and (2), taking a relation curve between the component content and the thickness of the measured silver coating as the basis: y=-1n(1-x)/0.1466 (y is more than or equal to 10 and less than or equal to 25), wherein, y represents the thickness of the silver coating; and x represents the content percentage of Ag; judging whether the thickness of the silver coating is qualified based on a numerical value of the maximum differential value delta max between the minimum value Agmin of the Ag content and the Ag content in each set of measurement data, and judging that the silver coating is qualified when Agmin is more than or equal to 94.7% and delta max is less than or equal to 4% in each set of measurement data. The method disclosed by the invention is capable of realizing rapid onsite, non-destructive detection of the thickness of the silver coating of the high-voltage isolating switch.
Description
Technical field
The invention belongs to the detection technique of power equipment, be specifically related to a kind of high voltage isolation switch contact silver coating thickness simple detection method.
Background technology
High voltage isolator plays insulating power supply in electric system, change system operation mode, deciliter little load current, carry out vital role such as grid switching operation.Its use amount is 2～3 times of isolating switch normally.Though its structure is simple relatively, also be one of very important high-tension apparatus of operation of power networks. to the safe operation important influence of electrical network.
High voltage isolation switch contact silver coating quality, especially thickness of coating directly influence the current-carrying capacity and the serviceable life of disconnector.At present, run on the high voltage isolator ubiquity contact heating problem in each electrical network of 35～500kV of the whole nation, thereby cause the impaired electric property that causes of current-carrying part to descend.2007-2011, a plurality of transformer station in Hunan Province disconnecting link infrared measurement of temperature displays temperature exceeds standard, and is former because its silver coating thickness low LCL.
Usually, high voltage isolator producer adopts the anodic solution coulometry to carry out thickness measuring to the contact silver coating, because this method must be placed on contact on the testing table and test; Must change, clean liquid medicine in the test, complex operation, test period is long; And the contact silver coating had destructiveness, the disconnector that particularly assembles is installed after also need unloading contact and having detected again; Influence project progress, this method is difficult to use at the scene.Therefore, it is very necessary to develop a kind of easy on-the-spot Dynamic Non-Destruction Measurement to the high voltage isolation switch contact silver coating.
Summary of the invention
The purpose of this invention is to provide a kind of high voltage isolation switch contact silver coating thickness simple detection method, to realize to the Non-Destructive Testing efficiently of high voltage isolator silver coating thickness scene.
Realize that the technical scheme that the object of the invention adopts is: high voltage isolation switch contact silver coating thickness simple detection method, carry out according to the following steps:
Silver coating component content and thickness relationship curve y=-ln (1-x)/0.1466 (10≤y≤25) that step 2, foundation are measured are foundation; Y is a silver coating thickness in the formula; X is an Ag content percentage; Numerical value with the maximum difference δ max between the Ag content in the minimum value Ag min of Ag content and the every group of measurement data judges whether silver coating thickness is qualified, when Ag min>=94.7% in every group of measurement data and δ max≤4%, judges that silver coating is qualified.
The inventive method is a kind of methodology of the thickness of high voltage isolator fingertip silver coating being carried out on-the-spot quick Non-Destructive Testing based on X fluorescence alloy analysis appearance; It has solved the relevant restriction of original detection method, can realize the on-the-spot sampling observation fast of high voltage isolator fingertip silver coating thickness.
Below in conjunction with accompanying drawing the present invention is described further.
Description of drawings
Fig. 1 is the fitted figure of silver coating thickness and composition.
Fig. 2 is copper base silver coating thickness criterion figure.
Embodiment
High voltage isolation switch contact silver coating thickness simple detection method of the present invention, its testing process is:
(1) detecting instrument requires: Portable X fluorescence alloy analysis appearance (XRF): exciting voltage is 45-50eKv, and exciting power is 2W, and excitaton source is constant;
(2) preheating: the palpus preheating is 5 minutes after the X fluorescence alloy analysis appearance start entering system;
(3) sampling: generally the first type surface with the silver coating of high voltage isolation switch contact is a workplace, guarantees probe over against sampling point, and probe can not move the surface of trying one's best during analysis; With probe the different parts of the silver coating of high voltage isolation switch contact is measured to obtain one group of measurement data, this group measurement data comprises 3 data values at least, is preferably 5 data values;
(4) alloy analysis: open the test of X fluorescence alloy analysis appearance, detection time should not surpass instrument the time is set, and need wait Ag during reading, carry out when the Cu constituent content tends towards stability, if ± 2 σ>10%, it is invalid that this reading is regarded as;
(5) probe cooling: under the normal condition, the every work of X fluorescence alloy analysis appearance ten minutes should be shut down and taken ten;
(6) be foundation according to silver coating component content and thickness relationship curve y=-ln (1-x)/0.1466 (10≤y≤25); Y is a silver coating thickness in the formula; X is an Ag content percentage; Numerical value with the maximum difference δ max between the Ag content in the minimum value Ag min of Ag content and the every group of measurement data judges whether silver coating thickness is qualified, when Ag min>=94.7% in every group of measurement data and δ max≤4%, judges that silver coating is qualified.
Detect principle:
Portable X fluorescence alloy analysis appearance (XRF) is analyzed Coating composition, and its analytic signal (being the silver coating composition of its measurement) depends on 4 factors: the chemical constitution of coating, the chemical constitution of coating matrix, thickness of coating and analyser intensify the source.When the composition of coating Ag and matrix Cu is confirmed, Portable X fluorescence alloy analysis appearance (XRF) intensify the source when also confirming, analytic signal just only depends on the Ag thickness of coating.Therefore, when with the Portable X fluorescence alloy analysis appearance (XRF) of same model the high voltage isolation switch contact silver coating being measured, the variation of its analytic signal has only parameter of silvering thickness.
(silvering is respectively 12.2 μ m to sample through preparing different silvering thickness; 15.9 μ m; 19.0 μ m, 19.5 μ m), and through the metallographic measuring method accurately measure its thickness of coating; Utilize Portable X fluorescence alloy analysis appearance (XRF) to obtain the composition response of different-thickness silver coating at last, see the following form 1.Wherein X Portable X fluorescence alloy analysis appearance (XRF) exciting voltage is 45-50eKv, and exciting power is 2W, and excitaton source is constant.
The Ag component content of table 1 silver coating and thickness relationship collection of illustrative plates
| Ag/% | 0 | 83.66 | 90.00 | 93.93 | 94.23 |
| Silver coating thickness/ |
0 | 12.2 | 15.9 | 19.0 | 19.5 |
Setting silver coating thickness is y, and Ag content percentage is x, and the above-mentioned data of match can obtain thickness of coating and graph of relation and the functional relation of taking the Ag content that formula X fluorescence alloy analysis appearance (XRF) measures: y=f (x).Matched curve figure sees Fig. 1.Functional relation is following:
y=-ln(1-x)/0.1466（10≤ｙ≤25，R
2?=0.9997）
Can carry out fast simple measurement to the thickness (thickness of Ag coating is at 10 to 25 μ m) of copper base Ag coating according to this functional relation.Can obtain silver-plated thickness of Fig. 2 copper base and Ag component content curve by following formula.
According to the regulation of state net company, the thickness of contact silver coating should can know that this moment, coating Ag content was 94.7% more than or equal to 20 μ m from Fig. 2, and this Ag composition is the criterion of the on-the-spot thickness measuring of silver coating.
For the homogeneity of silver coating thickness, 3 values of common one group of DATA REASONING, 5 values preferably, according to the trial value statistical study, the changes of contents value of the homogeneity corresponding A g of contact surface of contact thickness should not be greater than 4%.
Can know that to sum up it is that the minimum value Ag min of Ag content should be more than or equal to 94.7% that high voltage isolation switch contact silver coating thickness is taken criterion that formula X fluorescence alloy analysis appearance (XRF) measures, the Ag content maximum difference δ max of every group of test value should be smaller or equal to 4%.
Claims (2)
1.
A kind of high voltage isolation switch contact silver coating thickness simple detection method is characterized in that carrying out according to the following steps:
Step 1, use X fluorescence alloy analysis appearance are measured to obtain one group of measurement data the different parts of the silver coating of high voltage isolation switch contact with its probe, and this group measurement data comprises 3 data values at least;
Silver coating component content and thickness relationship curve y=-ln (1-x)/0.1466 (10≤y≤25) that
step 2, foundation are measured are foundation; Y is a silver coating thickness in the formula; X is an Ag content percentage; Numerical value with the maximum difference δ max between the Ag content in the minimum value Ag min of Ag content and the every group of measurement data judges whether silver coating thickness is qualified, when Ag min>=94.7% in every group of measurement data and δ max≤4%, judges that silver coating is qualified.
2.
high voltage isolation switch contact silver coating thickness simple detection according to claim 1 method is characterized in that this group measurement data is 5 data values in the said step 1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423891A (en) * | 2015-11-24 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Detection method for thickness of aluminium-silicon infiltration layer of blade surface |
| CN106989975A (en) * | 2017-05-17 | 2017-07-28 | 广西电网有限责任公司电力科学研究院 | A kind of preparation method of silver coating thickness calibration test piece |
| RU2674571C1 (en) * | 2017-12-29 | 2018-12-11 | Акционерное общество "НПО Энергомаш имени академика В.П. Глушко" | Method for determining a medium thickness of a silver coating on a copper ribbed wall |
| CN114324432A (en) * | 2021-12-16 | 2022-04-12 | 山东电力工业锅炉压力容器检验中心有限公司 | Method for detecting copper content of terminal strip coating of transformer bushing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62288509A (en) * | 1986-06-07 | 1987-12-15 | Toshiba Ceramics Co Ltd | Method for measuring film of heat resistant material |
| CN201876248U (en) * | 2010-12-02 | 2011-06-22 | 北京时代之峰科技有限公司 | Coating thickness measuring device |
-
2011
- 2011-11-14 CN CN2011103582161A patent/CN102494644A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62288509A (en) * | 1986-06-07 | 1987-12-15 | Toshiba Ceramics Co Ltd | Method for measuring film of heat resistant material |
| CN201876248U (en) * | 2010-12-02 | 2011-06-22 | 北京时代之峰科技有限公司 | Coating thickness measuring device |
Non-Patent Citations (1)
| Title |
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| 刘纯等: "高压隔离开关触指镀银层现场测厚技术开发", 《湖南电力》, vol. 30, no. 5, 31 October 2010 (2010-10-31), pages 14 - 16 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423891A (en) * | 2015-11-24 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Detection method for thickness of aluminium-silicon infiltration layer of blade surface |
| CN105423891B (en) * | 2015-11-24 | 2019-02-05 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of detection method of blade surface aluminum silicon infiltration layer thickness |
| CN106989975A (en) * | 2017-05-17 | 2017-07-28 | 广西电网有限责任公司电力科学研究院 | A kind of preparation method of silver coating thickness calibration test piece |
| RU2674571C1 (en) * | 2017-12-29 | 2018-12-11 | Акционерное общество "НПО Энергомаш имени академика В.П. Глушко" | Method for determining a medium thickness of a silver coating on a copper ribbed wall |
| CN114324432A (en) * | 2021-12-16 | 2022-04-12 | 山东电力工业锅炉压力容器检验中心有限公司 | Method for detecting copper content of terminal strip coating of transformer bushing |
| CN114324432B (en) * | 2021-12-16 | 2023-09-01 | 山东电力工业锅炉压力容器检验中心有限公司 | Method for detecting copper content of transformer bushing wiring terminal with plating layer |
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Application publication date: 20120613 |