CN104792691A - Testing method for researching influence of temperature, electric field and gases on copper corrosion process - Google Patents
Testing method for researching influence of temperature, electric field and gases on copper corrosion process Download PDFInfo
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- CN104792691A CN104792691A CN201510193987.8A CN201510193987A CN104792691A CN 104792691 A CN104792691 A CN 104792691A CN 201510193987 A CN201510193987 A CN 201510193987A CN 104792691 A CN104792691 A CN 104792691A
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Abstract
The invention provides a testing method for researching influence of temperature, electric field and gases on a copper corrosion process. The method comprises the following steps: placing pure copper, introducing different gases and feeding different oils into a testing device, then sealing the testing device, placing the testing device into a high temperature test chamber, pressurizing and raising the temperature, and further analyzing the influence of the temperature, electric field and gases on the copper corrosion process. The method provided by the invention can effectively research the influence of the temperature, AC/DC electric field, atmosphere and a passivator on the copper corrosion process, and provides powerful scientific data for corrosive sulfur inhibition of a large power transformer and related maintenance.
Description
Technical field
The present invention relates to a kind of test method, particularly a kind ofly study temperature, electric field and the gas test method to copper corrosion process influence.
Background technology
In mineral insulating oil, active sulfur refers to and can react with silver, copper metal and cause the element sulphur of metal erosion or heat-labile sulfide under certain condition, and they have higher corrosion activity to metallic copper, can cause the corrosion and damage of electrical equipment.
Electric insulation mineral oil in use inevitably with the Metal Contact such as silver, copper in the electrical equipments such as transformer, reactor, mutual inductor, if there is active sulfur in insulating oil, active sulfur reacts at Transformer and copper conductor, produces conductive materials cuprous sulfide (Cu in conductive line surfaces
2and separate out S), the infiltration of this substance, pollute insulating paper and oil, make inside transformer non-uniform electric, partial discharge inception voltage and electric field breakdown strengths reduce, finally cause transformer turn insulation to puncture, transformer coil burns, and has had a strong impact on the safety and stability economical operation of electrical network.
For ensureing the safe and stable operation of electrical network, research suppresses the method for active sulfur and concrete implementing measure to have very important Theory and applications meaning.
Summary of the invention
For above-mentioned subproblem, the invention provides and a kind ofly study temperature, electric field and the gas test method to copper corrosion process influence, described method seals after putting into fine copper in test unit, being filled with different gas and different oil, put into baking box pressurization to heat, and then analysis temperature, electric field and gas are on the impact of copper corrosion process.
Described test unit comprises insulcrete, inner high voltage stem, tank body;
Described tank body is U-shaped stainless steel casing, described shell has the first outer, and there is seal groove described first outer, and described seal groove is O type, interior placement O-ring seal; The side of tank body has the first valve, the second valve and the 3rd valve, described first valve is used for vacuumizing, and described second valve is used for gas injection, and it is fuel-displaced that described 3rd valve is used for oiling;
Described tank body uses insulcrete to be sealed by web member;
Described inner high voltage stem is installed and is fixed on the center of insulcrete, and tank interior is stretched into by the through hole on insulcrete in cuspidated one end.
Method provided by the invention effectively can study the impact on copper corrosion process of temperature, Alternate and direct electric field, atmosphere and passivator, for large-scale power transformer suppresses active sulfur and associated maintenance to provide strong science data.
Embodiment
In order to propose to suppress transformer oil to reduce Accident of Transformer to the burn into of metallic copper, extend transformer life successfully manage measure, for large-scale power transformer suppresses active sulfur and associated maintenance to provide strong science data, propose in one embodiment and a kind ofly study temperature, electric field and the gas test method to copper corrosion process influence, described method seals after putting into fine copper in test unit, being filled with different gas and different oil, put into baking box pressurization to heat, and then analysis temperature, electric field and gas are on the impact of copper corrosion process.Wherein, described test unit comprises insulcrete, inner high voltage stem, tank body; Described tank body is U-shaped stainless steel casing, described shell has the first outer, and there is seal groove described first outer, and described seal groove is O type, interior placement O-ring seal; The side of tank body has the first valve, the second valve and the 3rd valve, described first valve is used for vacuumizing, and described second valve is used for gas injection, and it is fuel-displaced that described 3rd valve is used for oiling; Described tank body uses insulcrete to be sealed by web member; Described inner high voltage stem is installed and is fixed on the center of insulcrete, and tank interior is stretched into by the through hole on insulcrete in cuspidated one end.
In another embodiment, test operation process is carried out refinement by described method, specifically comprises the steps:
S100, by the tank interior of washes of absolute alcohol test unit, and places half an hour after cleaning;
S200, puts into described tank interior by pure copper wire;
S300, vacuumizes test unit, makes vacuum tightness be less than 100Pa;
S400, inwardly injects an atmospheric nitrogen by the second valve;
S500, repeats step S300, S400, S300 many times until tank interior does not have air;
S600, by the 3rd valve to tank interior oiling;
S700, the gas needed for injection test;
S800, puts into baking oven by test unit, with wire, high-pressure side corresponding with tank interior with ground for the high-pressure side of high-tension apparatus and ground is connected, shuts oven door, starts to heat up, is raised to experiment temperature required, keeps 30 minutes;
S900, log is also analyzed.
In this embodiment, by step S100, all parts and inboard wall of cylinder block in the beaker of charge of oil, tank interior is carefully cleaned before each test with absolute ethyl alcohol, clean rear placement to dry half an hour, in object removal device, the impurity of large volume and dust, avoid them be in test attached to insulator surface thus affect test findings.By the multi-pass operations of step S300, S400, S300, can make there is no air completely in tank interior, so that learning gas is to corrupting influence.And before carrying out new applied voltage test at every turn, carry out sealing detection, after checking out, tank interior is put into baking oven, with wire, high-pressure side corresponding with tank interior with ground for the high-pressure side of high-tension apparatus and ground is connected, shuts baking ovens, start to heat up, be raised to the temperature required for experiment, described tank interior maximum temperature can reach 150 DEG C, keeps 30 minutes.At this moment can carry out temperature, electric field, atmosphere, passivator to the research of corrosive effects, namely will study the corrosivity of copper under different condition, comprise:
(1) temperature is to the research of active sulfur process influence: by changing temperature, the extent of corrosion of research copper cash;
(2) electric field is to the research of active sulfur process influence: by changing electric field level and alternating current-direct current field, the extent of corrosion of research copper cash;
(3) gas is to the research of active sulfur process influence: by changing the kind of insufflation gas, is such as filled with nitrogen, oxygen respectively to study the extent of corrosion of copper cash;
If there is no pure copper wire, can be obtained by following method process: by copper line surface sand papering, then by the copper of polishing with volatile and do not clean with the solvent of copper generation chemical reaction, such as acetone, sherwood oil; A period of time is placed in atmosphere, to guarantee that described solvent all vapors away after cleaning.
In one embodiment, utilize nitrogen to be inert gas, vacuumizing nitrogen injection 3 fundamental purposes is air in clearance test chamber, and in warranty test chamber, vacuum tightness is high, and does not have air.When test cavity vacuum tightness is less than 100Pa, give the oiling of test cavity.After having noted oil, certain vacuum space is arranged at test cavity top, because oil can not fill test cavity completely.If at this moment study atmospheric oxygen to corrupting influence, oxygen (99.99%) can be noted to test cavity.
In one embodiment, the air in auxiliary clearance test chamber is carried out with other inert gas replacement nitrogen.
In another embodiment, after oiling, be filled with nitrogen to study the corrosive process of copper.
Because test objective is to suppress transformer oil to the corrosion of metallic copper, reduce Accident of Transformer, extend transformer life, thus the oil injected in described step S600 is further defined to the transformer oil of two Bian Ji bis-sulphur adding 100ppm, or with the addition of the transformer oil of 100ppm bis-Bian Ji bis-sulphur and 200ppm passivator.
And if the oil that step S600 injects is the transformer oil adding a certain amount of two Bian Ji bis-sulphur, then step S900 comprises the corrosion level by detecting copper than color version, by the weight ratio of each element of spectral measurement copper strip surface, to judge extent of corrosion, if the content of copper surface element sulphur, sulfur content is more, then corrode more serious.
And if the oil that step S600 injects is for the addition of the transformer oil of a certain amount of two Bian Ji bis-sulphur, passivator, then step S900 also comprises the consumption being judged passivator by high performance liquid chromatography, and the validity of passivator is determined by the nitrogen content on spectroscopy detection copper wire surface, if nitrogen content is more, then illustrate that described passivator suppresses the effect of corrosion better.
Above to invention has been detailed introduction, applying specific case herein and setting forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for those skilled in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. study temperature, electric field and the gas test method to copper corrosion process influence, it is characterized in that:
Described method seals after putting into pure copper wire in test unit, being filled with different gas and different oil, put into high-temperature test chamber pressurization and heat, and then analysis temperature, electric field and gas is on the impact of copper corrosion process;
Wherein, described test unit comprises insulcrete, inner high voltage stem, tank body;
Described tank body is U-shaped stainless steel casing, described shell has the first outer, and there is seal groove described first outer, and described seal groove is O type, interior placement O-ring seal; The side of tank body has the first valve, the second valve and the 3rd valve, described first valve is used for vacuumizing, and described second valve is used for gas injection, and it is fuel-displaced that described 3rd valve is used for oiling;
Described tank body uses insulcrete to be sealed by web member;
Described inner high voltage stem is installed and is fixed on the center of insulcrete, and tank interior is stretched into by the through hole on insulcrete in cuspidated one end.
2. method according to claim 1, is characterized in that: preferred, described method comprises following
Concrete steps: S100, by the tank interior of washes of absolute alcohol test unit, and place half an hour after cleaning;
S200, puts into described tank interior by the pure copper wire processed;
S300, vacuumizes test unit, makes vacuum tightness be less than 100Pa;
S400, inwardly injects an atmospheric nitrogen by the second valve;
S500, repeats step S300, S400, S300 many times, until tank interior does not have air;
S600, by the 3rd valve to tank interior oiling, the oil mass injected is arranged according to testing requirements, and described pure copper wire must be flooded;
S700, the gas needed for injection test;
S800, puts into baking oven by test unit, with wire, high-pressure side corresponding with tank interior with ground for the high-pressure side of high-tension apparatus and ground is connected, shuts oven door, starts to heat up, is raised to experiment temperature required, keeps 30 minutes;
S900, log is also analyzed.
3. method according to claim 2, is characterized in that:
Described pure copper wire is obtained by following method: by copper line surface sand papering, then by the copper of polishing with volatile and do not clean with the solvent of copper generation chemical reaction; A period of time is placed in atmosphere, to guarantee that described solvent all vapors away after cleaning.
4. method according to claim 2, is characterized in that:
The oil injected in described step S600 is the transformer oil of two Bian Ji bis-sulphur adding 100ppm, or with the addition of the transformer oil of 100ppm bis-Bian Ji bis-sulphur and 200ppm passivator.
5. method according to claim 4, is characterized in that:
If the oil that step S600 injects is the transformer oil of two Bian Ji bis-sulphur adding 100ppm, then step S900 comprises the corrosion level being detected copper by color board, by the weight ratio of each element of spectral measurement copper line surface, to judge extent of corrosion; If sulfur content is more, then corrode more serious.
6. method according to claim 4, is characterized in that:
If the oil that step S600 injects is for the addition of the transformer oil of 100ppm bis-Bian Ji bis-sulphur and 200ppm passivator, then step S900 also comprises the consumption being judged passivator by high performance liquid chromatography; And the validity of passivator is determined by the nitrogen content on spectroscopy detection copper wire surface.
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| CN201510193987.8A CN104792691A (en) | 2015-04-22 | 2015-04-22 | Testing method for researching influence of temperature, electric field and gases on copper corrosion process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136550A (en) * | 2015-09-11 | 2015-12-09 | 云南电网有限责任公司电力科学研究院 | Method of checking harmful impurities in copper conductor for transformer |
-
2015
- 2015-04-22 CN CN201510193987.8A patent/CN104792691A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136550A (en) * | 2015-09-11 | 2015-12-09 | 云南电网有限责任公司电力科学研究院 | Method of checking harmful impurities in copper conductor for transformer |
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Application publication date: 20150722 |