Evaluation method for reliability of generator stator winding insulating material in marine environment
Through the application of multiple performance tests and specific calculation formulas for the generator stator winding insulation samples, the problem of difficulty in evaluating the reliability of stator winding insulation materials in marine environments is solved, and fast and accurate reliability evaluation is achieved.
Patent Information
- Application Number
- CN202411526297.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-02-11
AI Technical Summary
The prior art is difficult to quickly and accurately evaluate the reliability of generator stator winding insulation materials in marine environments. The traditional methods take a long time, have poor accuracy and are costly.
By conducting thermomechanical analysis, tensile performance test and dynamic mechanical performance test on the insulated samples of stator windings, parameters such as thermal expansion coefficient, tensile strength and elastic modulus are obtained, and a specific calculation formula is used to design reliability reflecting the marine environment. evaluation parameters Pocean.
The reliability and durability of generator stator winding insulation materials in marine environments are achieved, and the stability and durability of the materials in marine environments can be better evaluated.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of generator stator winding insulation materials, and in particular to a method for evaluating the reliability of generator stator winding insulation materials in a marine environment. Background Art
[0002] The stator winding of the generator is constructed by a number of stator wires according to a certain electrical connection method. The key to the stator winding anti-corona system is the anti-corona structure at the end of the stator wire. For large-scale generator sets, the stator wires are currently mainly formed with a one-time anti-corona structure, that is, the main insulation of the stator wire is impregnated with bisphenol A epoxy resin, and then wrapped with a high-resistance anti-corona tape, and then wrapped with an anti-corona protective layer, and then hot-pressed and cured by a mold at high temperature, so that the anti-corona tape, main insulation, and anti-corona protective layer are cured into an integrated structure.
[0003] Offshore wind power is a key area of China's renewable energy development. Offshore wind power has the characteristics of rich resources, high power generation utilization hours, no land occupation and suitable for large-scale development. It is the latest frontier of global wind power development. Application scenarios such as offshore wind are inseparable from generator and stator winding insulation. Therefore, the reliability of the generator stator winding insulation system facing the marine environment is crucial for new power generation application scenarios such as offshore wind power facing the marine environment, and plays a role as a prerequisite and foundation.
[0004] Unlike conventional land environments, marine environments are more severe and complex, mainly manifested in high salt fog, corrosion, sea ice collisions, large wave loads, typhoon damage, large environmental temperature differences, and severe thermal shocks. Therefore, in marine environments, the reliability of generator stator winding insulation is subjected to more severe tests. The comprehensive working conditions are significantly different from traditional application scenarios, and the reliability acceleration assessment method in traditional scenarios cannot be applied. At present, it can only be inspected by simulation sample preparation for several months or even years and actual operation in marine environment conditions, which is time-consuming, inaccurate, and costly.
[0005] Therefore, how to quickly evaluate the reliability of stator winding insulation materials in marine environments is a difficult problem that needs to be solved urgently. Currently, there are no relevant accurate evaluation methods and evaluation technologies. Summary of the invention
[0006] In view of the problem in the prior art that it is inconvenient to evaluate the reliability of stator winding insulation materials in a marine environment, the present invention provides a method for evaluating the reliability of generator stator winding insulation materials in a marine environment.
[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: a method for evaluating the reliability of generator stator winding insulation materials in a marine environment, comprising the following steps:
[0008] a. Take the stator winding insulation samples, perform thermomechanical analysis tests on the stator winding insulation samples to be tested and obtain their thermal expansion coefficient CTE Dry , tensile performance test and obtain its tensile strength S Dry And dynamic mechanical properties test and obtain its elastic modulus M Dry ;
[0009] b. Take the stator winding insulation sample, soak it in salt water, then take the sample soaked in salt water, dry it on the surface, and perform thermomechanical analysis test to obtain the thermal expansion coefficient CTE. NaCl , tensile performance test and obtain tensile strength S NaCl And dynamic mechanical properties test and obtain elastic modulus M NaCl ;
[0010] c. For the sample soaked in the salt water in step b, soak it again with an organic additive, then take the sample soaked in the organic additive, and after the surface is dried, perform a thermomechanical analysis test and obtain the thermal expansion coefficient CTE Wet , tensile performance test and obtain tensile strength S Wet And dynamic mechanical properties test and obtain elastic modulus M Wet ;
[0011] d. According to the obtained stator winding insulation reliability evaluation parameter P in marine environment ocean , to judge the stability, durability and reliability of stator winding insulation materials when used in marine environment. Among them, the reliability evaluation parameter P of stator winding insulation in marine environment ocean The calculation formula is as follows:
[0012]
[0013] Furthermore, when performing the thermomechanical analysis test in step a, the test is performed in accordance with "GB / T36800.2-2018 Plastic Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature" to obtain the thermal expansion coefficient CTE of the sub-winding insulation sample to be measured. Dry .
[0014] Furthermore, when the tensile properties test is performed in step a, the test is performed in accordance with "GB / T1040-2006 Determination of tensile properties of plastics" to obtain the tensile strength S of the sub-winding insulation sample to be measured. Dry .
[0015] Furthermore, in the dynamic mechanical properties test in step a, the test is performed in accordance with "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General Rules" to obtain the elastic modulus M of the sub-winding insulation sample to be measured.Dry .
[0016] Furthermore, the insulation sample of the sub-winding to be measured is immersed in the brine liquid for 5 to 800 hours at a temperature of 10 to 80°C.
[0017] Furthermore, the concentration of the brine liquid is 2-10 wt %, and the pH value is 6-8.
[0018] Furthermore, the organic additive is immersed in the stator winding insulation sample for 1 to 50 hours at a temperature of 25 to 80°C.
[0019] Furthermore, the organic auxiliary agent is a combination of one or more of the following organic substances: pentane, methylcyclohexane, 1,2-dichloroethane, turpentine, glycerin, silicone oil, white oil, epoxidized oil, epoxy fatty acid monoester, epoxy tetrahydrophthalate, chlorinated paraffin oil, chlorinated fatty acid methyl ester, epoxy soybean oil, and cresyl glycidyl ether.
[0020] Furthermore, the reliability evaluation parameter P of stator winding insulation in marine environment is ocean The calculation formula is as follows:
[0021]
[0022] Furthermore, when judging the stability, durability and reliability of stator winding insulation materials when used in marine environments, P ocean The larger it is, the better the stability, durability and reliability of the stator winding insulation material when used in a marine environment, and it can serve stably and reliably in a marine environment for a longer period of time.
[0023] In summary, the present invention has the following beneficial effects: the present invention obtains relevant parameters in three aspects by processing stator winding insulation samples and standardizing the test method of key performance indicators, and innovatively designs formulas to calculate evaluation parameters reflecting the reliability of generator stator winding insulation materials in marine environments, thereby achieving accurate and rapid evaluation of the reliability and durability of generator stator winding insulation materials in marine environments. DETAILED DESCRIPTION
[0024] The present invention is further described in detail below in conjunction with embodiments.
[0025] The reliability of the generator stator winding insulation material in the marine environment is mainly related to the thermal expansion coefficient, tensile strength and elastic modulus of the stator winding insulation material; the present invention processes, tests and obtains test data of the stator winding insulation sample.
[0026] First, take the stator winding insulation sample, directly perform the thermomechanical analysis test, tensile performance test and dynamic mechanical performance test on it and obtain the corresponding data, thermal expansion coefficient CTE Dry , tensile strength S Dry and elastic modulus M Dry .
[0027] Then, take the stator winding insulation sample, and soak the stator winding insulation sample to be measured in salt water liquid, take the sample after soaking in salt water liquid, soak the stator winding insulation sample to be measured in salt water liquid for 5 to 800 hours, soak at 10 to 80°C, the concentration of sodium chloride in the salt water liquid is 2 to 10wt%, and the pH value is 6 to 8. After the surface is dried, perform thermomechanical analysis test, tensile property test and dynamic mechanical property test respectively and obtain the corresponding data, thermal expansion coefficient CTE NaCl , tensile strength S NaCl and elastic modulus M NaCl The changes in the key parameters of the thermal expansion coefficient, tensile strength and elastic modulus of the stator winding insulation material when immersed in salt water are also one of the indicators reflecting its reliability in the marine environment.
[0028] Thirdly, in order to make the evaluation results more accurate, a special organic additive was developed for the generator stator winding insulation material. The samples soaked in the salt water liquid were then soaked in the organic additive, and then the samples soaked in the organic additive were taken. The organic additive is a combination of one or more of the following organic substances: quaternary pentane, methyl cyclohexane, 1,2-dichloroethane, turpentine, glycerin, silicone oil, white oil, epoxidized oil, epoxy fatty acid monoester, epoxy tetrahydrophthalate, chlorinated paraffin oil, chloro fatty acid methyl ester, epoxy soybean oil, cresyl glycidyl ether. After the surface was dried, thermomechanical analysis test, tensile property test and dynamic mechanical property test were carried out respectively and the corresponding data were obtained, and the coefficient of thermal expansion CTE Wet , tensile strength S wet and elastic modulus M Wet . The samples soaked in salt water are directly immersed in a specially developed special organic additive. The parts of the samples damaged by salt water corrosion will be "repaired and filled" to a certain extent. The degree of "repair and filling" is related to the tolerance and reliability of the sample itself in the marine environment. The thermal expansion coefficient, tensile strength and elastic modulus of the samples soaked in organic additives are tested. The results can be used as partial index parameters, thereby effectively reflecting the reliability of generator winding insulation materials in special scenarios such as marine environments.
[0029] Finally, according to the obtained reliability evaluation parameter P of stator winding insulation in marine environment ocean, to judge the stability, durability and reliability of stator winding insulation materials when used in marine environment. Among them, the reliability evaluation parameter P of stator winding insulation in marine environment ocean The calculation formula is as follows:
[0030]
[0031] When judging the stability, durability and reliability of stator winding insulation materials when used in marine environments, P ocean The larger it is, the better the stability, durability and reliability of the stator winding insulation material when used in a marine environment, and it can serve stably and reliably in a marine environment for a longer period of time.
[0032] Embodiment 1:
[0033] For two types of generator stator winding insulation materials, code A and B, reliability evaluation was conducted in marine environment. The steps are as follows:
[0034] Thermomechanical analysis tests are performed on the sub-winding insulation samples A and B to be measured, and the thermal expansion coefficient CTE of sample A is obtained respectively. Dry A = 90ppm / °C, thermal expansion coefficient CTE of sample B Dry B=60ppm / ℃, the test method refers to "GB / T36800.2-2018 Plastics Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature".
[0035] The tensile strength S of the test specimens A and B of the sub-winding insulation to be measured are respectively tested, and the tensile strength S of the specimen A is obtained. Dry A=68MPa, tensile strength S of sample B Dry B=180MPa, the test method refers to "GB / T1040-2006 Determination of tensile properties of plastics".
[0036] The dynamic mechanical properties of the sub-winding insulation samples A and B to be measured are tested respectively, and the elastic modulus M of sample A is obtained respectively. Dry A = 46000 MPa, elastic modulus of sample B M Dry B=30000MPa. The test method refers to "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General rules".
[0037] The test specimens A and B of the sub-winding insulation were immersed in brine with a concentration of 2wt% and a pH value of 7 for 400 hours at a temperature of 80°C. After the specimens were immersed in brine, they were dried and subjected to thermomechanical analysis, tensile properties and dynamic mechanical properties tests to obtain the thermal expansion coefficients CTE of specimens A and B. NaClA=30ppm / ℃、CTE NaCl B = 15ppm / ℃, tensile strength S NaCl A=10MPa、S NaCl B = 40 MPa, elastic modulus M NaCl A=28000MPa、M NaCl B = 13000MPa.
[0038] For the samples A and B soaked in the salt water liquid, an organic additive was used, which was made of a mixture of quaternary pentane, silicone oil, chlorinated paraffin oil, and epoxidized soybean oil in a mass ratio of 2:1:1:2. The soaking time was 50 hours and the soaking temperature was 25°C. Then, the samples soaked in the organic additive were taken and the surface was dried. Thermomechanical analysis test, tensile property test and dynamic mechanical property test were performed respectively, and the thermal expansion coefficient CTE of sample A and sample B were measured respectively. Wet A=70ppm / ℃、CTE Wet B = 44ppm / ℃, tensile strength S Wet A=55MPa、S Wet B = 120 MPa, elastic modulus M Wet A=40000MPa、M Wet B = 22000MPa.
[0039] The reliability evaluation parameter P of stator winding insulation in marine environment is calculated according to the formula ocean , Get P of sample A ocean A=152.5、P of sample B ocean B = 205.7. ocean B is greater than P ocean A, indicating that the reliability of stator winding insulation sample B when used in marine environment is better than that of sample A. After long-term actual use and stability evaluation of stator winding insulation materials in marine environment, it is found that compared with sample A, sample B has better stability, durability and reliability in marine environment, and can be stably and reliably used for a longer time in marine environment, proving that the results of the present invention are accurate.
[0040] Embodiment 2:
[0041] For two types of generator stator winding insulation materials, code C and D, reliability evaluation was conducted in marine environment. The steps are as follows:
[0042] Thermomechanical analysis tests were performed on the sub-winding insulation samples C and D to be measured, and the thermal expansion coefficient CTE of sample C was obtained. Dry C = 35ppm / °C, thermal expansion coefficient CTE of sample D DryD = 66ppm / ℃, the test method refers to "GB / T36800.2-2018 Plastics Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature";
[0043] The tensile strength S of the sub-winding insulation samples C and D to be measured are respectively tested, and the tensile strength S of the sample C is obtained. Dry C = 50 MPa, tensile strength S of sample D Dry D=100MPa. The test method refers to "GB / T 1040-2006 Determination of tensile properties of plastics".
[0044] The dynamic mechanical properties of the sub-winding insulation samples C and D to be measured are tested respectively, and the elastic modulus M of sample C is obtained respectively. Dry C = 45000 MPa, elastic modulus M of sample D Dry D=10000MPa. The test method refers to "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General rules".
[0045] The test specimens C and D of the sub-winding insulation were immersed in brine with a concentration of 5wt% and a pH value of 7 for 500 hours at a temperature of 10°C. After the specimens were immersed in brine, they were dried and subjected to thermomechanical analysis, tensile properties and dynamic mechanical properties tests to obtain the thermal expansion coefficients CTE of specimens C and D. NaCl C=18ppm / ℃、CTE NaCl D = 30ppm / ℃, tensile strength S NaCl C=16MPa、S NaCl D = 20 MPa, elastic modulus M NaCl C=19000MPa、M NaCl D = 3400MPa.
[0046] Samples C and D soaked in salt water were soaked in an organic additive, which was a mixture of epoxy tetrahydrophthalate and cresyl glycidyl ether in a mass ratio of 3:1. The soaking time was 40 hours and the soaking temperature was 60°C. Then, the samples soaked in the organic additive were taken and the surface was dried before thermomechanical analysis, tensile properties and dynamic mechanical properties tests were performed to measure the thermal expansion coefficients CTE of samples C and D. Wet C=26ppm / ℃、CTE Wet D = 54ppm / ℃, tensile strength S Wet C=40MPa、S Wet D = 90 MPa, elastic modulus M Wet C=31000MPa、M WetD = 4200MPa.
[0047] The reliability evaluation parameter P of stator winding insulation in marine environment is calculated according to the formula ocean , Get P of sample C ocean C = 180.4, P of sample D ocean D = 151.7. Pocean C is greater than P ocean D, indicating that the reliability of stator winding insulation sample C when used in marine environment is better than that of sample D. After long-term actual use and stability evaluation of stator winding insulation materials in marine environment, it is found that compared with sample D, sample C has better stability, durability and reliability in marine environment, and can be stably and reliably used for a longer time in marine environment, proving that the results of the present invention are accurate.
[0048] Embodiment 3:
[0049] For two types of generator stator winding insulation materials, code E and F, reliability evaluation was conducted in marine environment. The steps are as follows:
[0050] Thermomechanical analysis tests were performed on the sub-winding insulation samples E and F to be measured, and the thermal expansion coefficient CTE of sample E was obtained. Dry E = 72ppm / ℃, thermal expansion coefficient CTE of sample F Dry F=85ppm / ℃, the test method refers to "GB / T36800.2-2018 Plastics Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature".
[0051] The tensile properties of the sub-winding insulation samples E and F to be measured are tested respectively, and the tensile strength S of sample E is obtained respectively. Dry E = 135 MPa, tensile strength S of sample F Dry F=90MPa, the test method refers to "GB / T 1040-2006 Determination of tensile properties of plastics".
[0052] The dynamic mechanical properties of the sub-winding insulation samples E and F to be measured are tested respectively, and the elastic modulus M of sample E is obtained respectively. Dry E = 5000 MPa, elastic modulus M of sample F Dry F=22000MPa, test method refers to "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General rules".
[0053] The test specimens E and F were immersed in brine with a concentration of 8wt% and a pH value of 6. The immersion time was 800 hours and the immersion temperature was 50°C. The specimens were then taken and dried for thermomechanical analysis, tensile properties and dynamic mechanical properties tests. The thermal expansion coefficients CTE of specimens E and F were obtained. NaCl E=16ppm / ℃、CTE NaCl F=22ppm / ℃,tensile strength S NaCl E=15MPa、S NaCl F = 40 MPa, elastic modulus M NaCl E=2500MPa、M NaCl F=7000MPa.
[0054] For the samples E and F soaked in the salt water liquid, an organic additive was used, which was a mixture of chlorinated fatty acid methyl ester, glycerol, epoxidized oil and methyl cyclohexane, with a mass ratio of 4:1:2:1, and the samples were soaked for 10 hours at a temperature of 40°C. Then, the samples soaked in the organic additive were taken, and after the surface was dried, thermomechanical analysis test, tensile property test and dynamic mechanical property test were performed respectively, and the thermal expansion coefficient CTE of samples E and F was measured respectively. Wet E=56ppm / ℃、CTE Wet F=58ppm / ℃,tensile strength S Wet E=92MPa、S Wet F=67MPa, elastic modulus M Wet E=4100MPa、M Wet F=17000MPa.
[0055] The reliability evaluation parameter P of stator winding insulation in marine environment is calculated according to the formula ocean , Get P of sample E ocean E=216.8、P of sample F ocean F = 61.4. ocean E is greater than P ocean F, indicating that the reliability of stator winding insulation sample E when used in marine environment is better than that of sample F. Through the actual use and stability evaluation of stator winding insulation materials in a long-term marine environment, it is found that compared with sample F, sample E has better stability, durability and reliability in marine environment, and can be stably and reliably used for a longer time in the marine environment, proving that the results of the present invention are accurate.
[0056] Example 4
[0057] For two types of generator stator winding insulation materials, codenamed G and H, both of which are Tongma epoxy multi-resin systems, reliability evaluation was carried out in marine environment. The steps are as follows:
[0058] Thermomechanical analysis tests were performed on the sub-winding insulation samples G and H to be measured, and the thermal expansion coefficient CTE of sample G was obtained. Dry G = 95ppm / °C, thermal expansion coefficient CTE of sample H Dry H=40ppm / ℃, the test method refers to "GB / T36800.2-2018 Plastics Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature".
[0059] The tensile strength S of the sub-winding insulation samples G and H to be measured are respectively tested, and the tensile strength S of the sample G is obtained. Dry G = 45 MPa, tensile strength S of sample H Dry H=80MPa, the test method refers to "GB / T 1040-2006 Determination of tensile properties of plastics".
[0060] The dynamic mechanical properties of the sub-winding insulation samples G and H to be measured are tested respectively, and the elastic modulus M of the sample G is obtained respectively. Dry G = 15000 MPa, elastic modulus M of sample H Dry H=9000MPa. The test method refers to "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General rules".
[0061] Use brine liquid with a concentration of 10wt% and a pH value of 8 to soak the sub-winding insulation samples G and H to be tested for 200h at a temperature of 70°C. Then take the samples soaked in brine and perform thermomechanical analysis, tensile properties and dynamic mechanical properties tests after the surface is dried to obtain the thermal expansion coefficients CTE of samples G and H, respectively. NaCl G=60ppm / ℃、CTE NaCl H=20ppm / ℃,tensile strength S NaCl G=18MPa、S NaCl H = 38 MPa, elastic modulus M NaCl G=5000MPa、M NaCl H = 6800MPa.
[0062] For the samples G and H soaked in the salt water liquid, an organic additive was used, which was a mixture of chloro fatty acid methyl ester, glycerol, epoxidized oil and methyl cyclohexane, with a mass ratio of 1:5:1:2. The organic additive was used for soaking for 5 hours at a soaking temperature of 50°C. Then, the samples soaked in the organic additive were taken and the surface was dried before thermomechanical analysis test, tensile property test and dynamic mechanical property test were performed to measure the thermal expansion coefficient CTE of samples G and H, respectively. Wet G=80ppm / ℃、CTE Wet H = 33ppm / ℃, tensile strength S Wet G=33MPa、S Wet H = 59 MPa, elastic modulus M Wet G=8400MPa、M Wet H=8500MPa.
[0063] The reliability evaluation parameter P of stator winding insulation in marine environment is calculated according to the formula ocean , Get P of sample G ocean G = 24.8, P of sample H ocean H = -2.7. ocean G is greater than P ocean H, indicating that the reliability of stator winding insulation sample G when used in marine environment is better than that of sample H. Through the actual use and stability evaluation of stator winding insulation materials in a long-term marine environment, it is found that compared with sample H, sample G has better stability, durability and reliability in marine environment, and can be stably and reliably used for a longer time in the marine environment, proving that the results of the present invention are accurate.
[0064] Example 5
[0065] For two types of generator stator winding insulation materials, codenamed I and J, reliability evaluation was conducted in marine environment. The steps are as follows:
[0066] Thermomechanical analysis tests were performed on the sub-winding insulation samples I and J to obtain the thermal expansion coefficient CTE of sample I. Dry I = 50ppm / °C, thermal expansion coefficient CTE of sample J Dry J=72ppm / ℃, the test method refers to "GB / T36800.2-2018 Plastics Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature".
[0067] The tensile strength S of the test specimens I and J of the sub-winding insulation to be tested are respectively obtained. Dry I = 76 MPa, tensile strength S of sample J DryJ=129MPa. The test method refers to "GB / T 1040-2006 Determination of tensile properties of plastics".
[0068] The dynamic mechanical properties of the sub-winding insulation samples I and J to be measured are tested respectively, and the elastic modulus M of sample I is obtained respectively. Dry I = 42000 MPa, elastic modulus M of sample J Dry J=18000MPa. The test method refers to "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General rules".
[0069] The brine liquid with a concentration of 4wt% and a pH value of 7 was used to immerse the sub-winding insulation samples I and J to be tested. The immersion time was 5 hours and the immersion temperature was 40°C. Then, the samples soaked in the brine liquid were taken and the surface was dried before performing thermomechanical analysis test, tensile property test and dynamic mechanical property test to obtain the thermal expansion coefficient CTE of samples I and J respectively. NaCl I=25ppm / ℃、CTE NaCl J = 30ppm / ℃, tensile strength S NaCl I=26MPa、S NaCl J = 39 MPa, elastic modulus M NaCl I=14000MPa、M NaCl J = 3800MPa.
[0070] Samples I and J soaked in salt water were soaked in an organic additive made of a mixture of 1,2-dichloroethane, turpentine, epoxy fatty acid monoester, epoxy soybean oil and chloro fatty acid methyl ester in a mass ratio of 1:2:1:3:1. The soaking time was 35 hours and the soaking temperature was 80°C. Then, the samples soaked in the organic additive were taken and the surface was dried before thermomechanical analysis test, tensile property test and dynamic mechanical property test were performed. The thermal expansion coefficient CTE of sample I and sample J was measured respectively. Wet I=39ppm / ℃、CTE Wet J = 57ppm / ℃, tensile strength S Wet I=51MPa、S Wet J = 100 MPa, elastic modulus M Wet I=32000MPa、M Wet J=13100MPa.
[0071] The reliability evaluation parameter P of stator winding insulation in marine environment is calculated according to the formula ocean , Get P of sample I ocean I=167.3、P of sample J ocean J = 115.2. oceanI is greater than P ocean J, indicating that the reliability of stator winding insulation sample I when used in marine environment is better than that of sample J. Through the actual use and stability evaluation of stator winding insulation materials in a long-term marine environment, it is found that compared with sample J, sample I has better stability, durability and reliability in marine environment, and can be stably and reliably used for a longer time in the marine environment, proving that the results of the present invention are accurate.
[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for evaluating the reliability of generator stator winding insulation materials in a marine environment, comprising the following steps: a. Take the stator winding insulation samples, perform thermomechanical analysis tests on the stator winding insulation samples to be tested and obtain their thermal expansion coefficient CTE Dry , tensile performance test and obtain its tensile strength S Dry And dynamic mechanical properties test and obtain its elastic modulus M Dry ; b. Take the stator winding insulation sample, soak it in salt water, then take the sample soaked in salt water, dry it on the surface, and perform thermomechanical analysis test to obtain the thermal expansion coefficient CTE. NaCl , tensile performance test and obtain tensile strength S NaCl And dynamic mechanical properties test and obtain elastic modulus M NaCl ; c. For the sample soaked in the salt water in step b, soak it again with an organic additive, then take the sample soaked in the organic additive, and after the surface is dried, perform a thermomechanical analysis test and obtain the thermal expansion coefficient CTE Wet , tensile performance test and obtain tensile strength S Wet And dynamic mechanical properties test and obtain elastic modulus M Wet ; d. According to the obtained stator winding insulation reliability evaluation parameter P in marine environment ocean , to judge the stability, durability and reliability of stator winding insulation materials when used in marine environment. Among them, the reliability evaluation parameter P of stator winding insulation in marine environment ocean The calculation formula is as follows:
2. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 1, characterized in that: When performing the thermomechanical analysis test in step a, the test is performed in accordance with "GB / T36800.2-2018 Plastic Thermomechanical Analysis (TMA) Part 2: Linear Thermal Expansion Coefficient and Glass Transition Temperature" to obtain the thermal expansion coefficient CTE of the sub-winding insulation sample to be measured. Dry .
3. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 2, characterized in that: When performing the tensile property test in step a, the test is performed in accordance with "GB / T1040-2006 Determination of tensile properties of plastics" to obtain the tensile strength S of the sub-winding insulation sample to be measured. Dry .
4. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 3, characterized in that: In the dynamic mechanical properties test in step a, the test is carried out in accordance with "GBT33061.1-2016 Determination of dynamic mechanical properties of plastics Part 1 General Rules" to obtain the elastic modulus M of the sub-winding insulation sample to be measured. Dry .
5. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 4, characterized in that: The insulation sample of the sub-winding to be measured is immersed in the brine liquid for 5 to 800 hours, and the immersion temperature is 10 to 80°C.
6. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 5, characterized in that: The sodium chloride concentration in the brine liquid is 2-10 wt %, and the pH value is 6-8.
7. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 1, characterized in that: The time for soaking the stator winding insulation sample in the organic additive is 1 to 50 hours, and the soaking temperature is 25 to 80°C.
8. The method for evaluating the reliability of the generator stator winding insulation material in a marine environment according to any one of claims 5 to 7, characterized in that: The organic auxiliary agent is a combination of one or more of the following organic substances: pentane, methylcyclohexane, 1,2-dichloroethane, turpentine, glycerin, silicone oil, white oil, epoxidized oil, epoxy fatty acid monoester, epoxy tetrahydrophthalate, chlorinated paraffin oil, chlorinated fatty acid methyl ester, epoxy soybean oil, and cresyl glycidyl ether.
9. The method for evaluating the reliability of generator stator winding insulation materials in a marine environment according to claim 1, characterized in that: When judging the stability, durability and reliability of stator winding insulation materials when used in marine environments, P ocean The larger it is, the better the stability, durability and reliability of the stator winding insulation material when used in a marine environment, and it can serve stably and reliably in a marine environment for a longer period of time.