A method for evaluating the volume resistivity change of power oil based on colloid and microbial analysis

Abstract

The present invention discloses a method for evaluating the change in volume resistivity of electric oil based on colloid and microbial analysis, which belongs to the technical field of the electric power industry. The method for evaluating the change in volume resistivity of electric oil based on colloid and microbial analysis comprises the following steps: (1) preparing colloid and microbial raw materials to form a test analysis base material; (2) adding a resistivity test electrode to the test analysis base material obtained in step (1), and evaluating the change in volume resistivity of electric oil by combining a resistivity control algorithm model and a resistivity optimization algorithm model. After testing, the solution designed by the present invention is used to evaluate the change in volume resistivity of electric oil. In Example 1, the error rate with the true value is 0.5%; in Example 2, the error rate with the true value is 0.3%; and in Example 3, the error rate with the true value is 0.2%. Reasonable resistivity control algorithm models and resistivity optimization algorithm models effectively improve the effectiveness of evaluating the change in volume resistivity of electric oil.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power industry, and in particular relates to a method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis. Background Art

[0002] The speed control system of large-scale generator sets with high parameters has generally adopted phosphate ester fire-resistant oil as its working medium. The dielectric properties of fire-resistant oil are usually characterized by volume resistivity. If the volume resistivity is less than 6.0×10 9 If the volume resistivity of the oil exceeds Ω·cm, it may cause electrochemical corrosion of the oil system's speed regulating sleeve, affecting the performance of the unit's regulating system. The volume resistivity of transformer insulating oil is an important indicator of the degree of transformer oil degradation and contamination. When the insulating oil is oxidized, degraded by overheating, or mixed with other impurities, the generation of polar impurities or charged colloids increases, and the volume resistivity increases accordingly. During transformer operation, if the volume resistivity of the insulating oil increases due to some reason, the insulation level of the transformer body will be reduced, threatening its safe operation and resulting in high maintenance costs. Therefore, elucidating the mechanism by which colloids and microorganisms affect the volume resistivity of power oils (fire-resistant oils, insulating oils) based on multi-data fusion is of great significance both in production practice and basic research.

[0003] To thoroughly resolve the issue of abnormal volume resistivity changes in power oil, which can initially fail to meet standards but then pass after a period of quiescence, identify the cause of excessive volume resistivity, and reduce production accidents caused by oil quality issues, it is necessary to utilize a variety of technical means to study the physical, chemical, biological, and electrical indicators and properties of the oil used in the equipment and its products, identify the root cause, and ultimately resolve the problem of abnormal volume resistivity changes.

[0004] However, research on abnormal changes in the volume resistivity of power oils based on comprehensive testing is rare, especially research that combines multi-angle testing of fire-resistant fuels and insulating oils with qualitative product analysis. Therefore, comprehensive, multi-faceted research on equipment oils and their products, based on analysis of their physical, chemical, biological, and electrical properties, is crucial. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention provides a method for evaluating the volume resistivity change of electric fuel based on colloid and microbial analysis. Testing demonstrates that the proposed method achieves a 0.5% error from the true value in Example 1, a 0.3% error in Example 2, and a 0.2% error in Example 3. This demonstrates that a reasonable resistivity control and optimization algorithm can effectively enhance the effectiveness of evaluating the volume resistivity change of electric fuel.

[0006] 2. Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for evaluating the volume resistivity change of power oil based on colloid and microbial analysis.

[0009] The following steps are involved:

[0010] (1) Prepare colloid and microbial raw materials and form test and analysis base materials;

[0011] (2) Adding a resistivity test electrode to the test analysis base material obtained in step (1), and combining the resistivity control algorithm model with the resistivity optimization algorithm model to evaluate the change in volume resistivity of the power oil.

[0012] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0013] The colloid described in step (1) comprises the following raw materials in parts by weight:

[0014]

[0015] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0016] The preparation method of the colloid described in step (1) is as follows:

[0017] Melt the xanthan gum at 60-80°C to obtain xanthan gum liquid. Then, use hydrofluoric acid as a dispersant, mix the hydrofluoric acid with tetrabutylammonium hydroxide and polyethyleneimine and transfer it to the xanthan gum liquid. Ultrasonic dispersion is performed at 200w-300w for 20min-40min. Then, hexadecyltrimethylammonium bromide is added, a clean glass slide is inserted, and the mixture is placed in a constant temperature drying oven at 40°C-60°C and dried for 2h-6h.

[0018] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0019] The microbial raw materials described in step (1) include the following raw materials in parts by weight:

[0020] 2-8 portions of plant lactobacillus,

[0021] 1-6 parts of Streptococcus citriodora,

[0022] 10-15 parts of Burkholderia gladiolus.

[0023] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0024] The preparation method of the microbial raw material is as follows:

[0025] Prepare Lactobacillus plantarum, Streptococcus citriodora and Burkholderia gladiolus, add them into LB broth at a mass ratio of 1:(100-150) for fermentation, wherein the fermentation temperature is 37°C and the fermentation time is 72h-108h; after the fermentation is completed, the fermentation product is collected, centrifuged and the supernatant is taken.

[0026] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0027] The operating steps of the resistivity control algorithm model are as follows:

[0028] S1, the surface resistance of the colloid in the power oil after being divided into n parts is detected, and the surface resistance value of the colloid in the power oil to be detected is extracted and set as (x1, x2, x3, ..., x n ), where x i is the surface resistance value of the colloid in the i-th portion of power oil, and the total surface resistance value of the colloid in each portion of power oil is calculated. The calculation formula for the total surface resistance value of the colloid in the i-th portion of power oil is: Where r is the radius of the microbial raw material culture dish, k is the volume of electric oil per unit area on the surface of the colloid;

[0029] S2, extract the resistance value sequence of each portion of power oil (s1, s2, s3, ..., s n ), from which the minimum value s of the resistance value sequence of each power oil is extracted min , add ns to the surface of the colloid min The microbial raw materials are stirred and allowed to stand for 10-20 minutes;

[0030] S3. Repeat the operations S1-S2 until the surface resistance of the colloid extracted from the power oil to be tested is within the qualified value required for the change evaluation, and the evaluation operation is completed.

[0031] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0032] In step S1, the method of dividing into n equal parts is as follows:

[0033] Insulating glass panels are selected in the vertical direction to isolate the oil used for electricity, with the isolation distance being 20 cm.

[0034] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0035] The operating steps of the resistivity optimization algorithm model are as follows:

[0036] During the elution process of the resistivity test electrode, the solution is irradiated with a monochromatic light irradiation plate with a uniformly distributed monochromatic light lamp on the surface. The obtained monochromatic light emission intensity sequence is (I1, I2, I3, ..., I n ), where n is the number of monochromatic lamps on the illumination board, I i is the emission intensity of the i-th monochromatic light, and at the same time, the thickness k of the solution absorption pool is collected, and at the same time, the light receiver collects the light intensity sequence after passing through the solution (L1, L2, L3, ..., L n ), where L i is the received light intensity of the i-th light receiver, and the i-th monochromatic light lamp corresponds to the position of the i-th light receiver;

[0037] Calculate the average transmittance of the solution. The concentration of the substance in the solution is calculated in real time, because the incident light intensity I, the output light intensity L, the thickness a of the reactor, the concentration b of the solvent and the absorption coefficient c in the solution satisfy the formula: The concentration of the absorbing solvent is obtained from this Substitute Q into Wherein, the concentration of the solvent in the eluted solution is obtained: b i Compare with the required concentration in real time. If the obtained b i If the difference from the required concentration is less than the set value, the elution is complete.

[0038] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0039] After the elution process, the uniformity of the power oil solution is also tested:

[0040] The solution is divided into m blocks with equal spacing in the longitudinal direction. The incident light intensity I and the outgoing light intensity L are collected and substituted into the average transmittance formula to calculate the average transmittance of the j-th solution, which is recorded as Q j , calculate the uniformity of the solution, the uniformity calculation formula is: The calculated uniformity is compared with the set uniformity threshold. If the calculated uniformity is greater than or equal to the set uniformity threshold, it means that the uniformity is unqualified and needs to be stirred; if the calculated uniformity is less than the set uniformity threshold, it means that the uniformity is qualified and no stirring is required and it can be used directly.

[0041] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0042] The method for assembling the test analysis base material described in step (1) is as follows:

[0043] Pour the colloid and microbial raw materials into a mold and mix them at high temperature, wherein the high temperature mixing is 60℃-70℃, and then cool them down.

[0044] Beneficial effects

[0045] Testing of the proposed solution for evaluating the volume resistivity change of power oil revealed the following results: Example 1 exhibited a 0.5% error from the true value; Example 2 exhibited a 0.3% error; and Example 3 exhibited a 0.2% error. This demonstrates that a rational resistivity control and optimization algorithm can effectively enhance the effectiveness of evaluating the volume resistivity change of power oil, providing guidance for oil changes and filtration in operating steam turbines and transformers, and establishing a basis for quality-based oil replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The figure is a flow chart of the method for evaluating the change in volume resistivity of electric power oil based on colloid and microbial analysis in the present invention.

[0047] Figure 2 This is a distribution particle size diagram of the average error of Example 3 of the present invention. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention are described in detail below. The described embodiments are only some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of the present invention. The present invention is further described below in conjunction with specific embodiments.

[0049] Example 1

[0050] like Figure 1 As shown in the figure, the method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0051] The following steps are involved:

[0052] (1) Prepare colloid and microbial raw materials and form test and analysis base materials;

[0053] (2) Adding a resistivity test electrode to the test analysis base material obtained in step (1), and combining the resistivity control algorithm model with the resistivity optimization algorithm model to evaluate the change in volume resistivity of the power oil.

[0054] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0055] The colloid described in step (1) comprises the following raw materials in parts by weight:

[0056]

[0057] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0058] The preparation method of the colloid described in step (1) is as follows:

[0059] Melt xanthan gum at 60°C to obtain xanthan gum liquid. Then, use hydrofluoric acid as a dispersant, mix hydrofluoric acid with tetrabutylammonium hydroxide and polyethyleneimine and transfer it to the xanthan gum liquid. Ultrasonic dispersion at 200w for 20 minutes, then add hexadecyltrimethylammonium bromide, insert a clean glass slide, and place in a constant temperature drying oven at 40°C to dry for 2 hours.

[0060] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0061] The microbial raw materials described in step (1) include the following raw materials in parts by weight:

[0062] 8 portions of plant lactobacillus,

[0063] 1 part of Streptococcus citriodora,

[0064] 15 copies of Burkholderia gladiolus.

[0065] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0066] The preparation method of the microbial raw material is as follows:

[0067] Prepare Lactobacillus plantarum, Streptococcus citriodora and Burkholderia gladiolus, add them into LB broth at a mass ratio of 1:100 for fermentation, wherein the fermentation temperature is 37°C and the fermentation time is 72 hours; after the fermentation is completed, the fermentation product is collected, centrifuged and the supernatant is taken.

[0068] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0069] The operating steps of the resistivity control algorithm model are as follows:

[0070] S1, the surface resistance of the colloid in the power oil after being divided into n parts is detected, and the surface resistance value of the colloid in the power oil to be detected is extracted and set as (x1, x2, x3, ..., x n ), where x i is the surface resistance value of the colloid in the i-th portion of power oil, and the total surface resistance value of the colloid in each portion of power oil is calculated. The calculation formula for the total surface resistance value of the colloid in the i-th portion of power oil is: Where r is the radius of the microbial raw material culture dish, k is the volume of electric oil per unit area on the surface of the colloid;

[0071] S2, extract the resistance value sequence of each portion of power oil (s1, s2, s3, ..., s n ), from which the minimum value s of the resistance value sequence of each power oil is extracted min , add ns to the surface of the colloid min The microbial raw materials were stirred and allowed to stand for 10 minutes;

[0072] S3. Repeat the operations S1-S2 until the surface resistance of the colloid extracted from the power oil to be tested is within the qualified value required for the change evaluation, and the evaluation operation is completed.

[0073] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0074] In step S1, the method of dividing into n equal parts is as follows:

[0075] Insulating glass panels are selected in the vertical direction to isolate the oil used for electricity, with the isolation distance being 20 cm.

[0076] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0077] The operating steps of the resistivity optimization algorithm model are as follows:

[0078] During the elution process of the resistivity test electrode, the solution is irradiated with a monochromatic light irradiation plate with a uniformly distributed monochromatic light lamp on the surface. The obtained monochromatic light emission intensity sequence is (I1, I2, I3, ..., I n ), where n is the number of monochromatic lamps on the illumination board, I i is the emission intensity of the i-th monochromatic light, and at the same time, the thickness k of the solution absorption pool is collected, and at the same time, the light receiver collects the light intensity sequence after passing through the solution (L1, L2, L3, ..., L n ), where L iis the received light intensity of the i-th light receiver, and the i-th monochromatic light lamp corresponds to the position of the i-th light receiver;

[0079] Calculate the average transmittance of the solution. The concentration of the substance in the solution is calculated in real time, because the incident light intensity I, the output light intensity L, the thickness a of the reactor, the concentration b of the solvent and the absorption coefficient c in the solution satisfy the formula: The concentration of the absorbing solvent is obtained from this Substitute Q into Wherein, the concentration of the solvent in the eluted solution is obtained: b i Compare with the required concentration in real time. If the obtained b i If the difference from the required concentration is less than the set value, the elution is complete.

[0080] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0081] After the elution process, the uniformity of the power oil solution is also tested:

[0082] The solution is divided into m blocks with equal spacing in the longitudinal direction. The incident light intensity I and the outgoing light intensity L are collected and substituted into the average transmittance formula to calculate the average transmittance of the j-th solution, which is recorded as Q j , calculate the uniformity of the solution, the uniformity calculation formula is: The calculated uniformity is compared with the set uniformity threshold. If the calculated uniformity is greater than or equal to the set uniformity threshold, it means that the uniformity is unqualified and needs to be stirred; if the calculated uniformity is less than the set uniformity threshold, it means that the uniformity is qualified and no stirring is required and it can be used directly.

[0083] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0084] The method for assembling the test analysis base material described in step (1) is as follows:

[0085] Pour the colloid and microbial raw materials into a mold and mix them at high temperature, wherein the high temperature mixing is 60°C, and then cool them down.

[0086] Example 2

[0087] like Figure 1 As shown in the figure, the method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0088] The following steps are involved:

[0089] (1) Prepare colloid and microbial raw materials and form test and analysis base materials;

[0090] (2) Adding a resistivity test electrode to the test analysis base material obtained in step (1), and combining the resistivity control algorithm model with the resistivity optimization algorithm model to evaluate the change in volume resistivity of the power oil.

[0091] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0092] The colloid described in step (1) comprises the following raw materials in parts by weight:

[0093]

[0094] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0095] The preparation method of the colloid described in step (1) is as follows:

[0096] The xanthan gum was melted at 80°C to obtain xanthan gum liquid. Then, hydrofluoric acid was used as a dispersant. The hydrofluoric acid was mixed with tetrabutylammonium hydroxide and polyethyleneimine and transferred into the xanthan gum liquid. Ultrasonic dispersion was performed at 300w for 40 minutes. Then, hexadecyltrimethylammonium bromide was added, a clean glass slide was inserted, and the mixture was placed in a constant temperature drying oven at 60°C and dried for 6 hours.

[0097] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0098] The microbial raw materials described in step (1) include the following raw materials in parts by weight:

[0099] 8 portions of plant lactobacillus,

[0100] 1 part of Streptococcus citriodora,

[0101] 15 copies of Burkholderia gladiolus.

[0102] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0103] The preparation method of the microbial raw material is as follows:

[0104] Prepare Lactobacillus plantarum, Streptococcus citriodora and Burkholderia gladiolus, add them into LB broth at a mass ratio of 1:150 for fermentation, wherein the fermentation temperature is 37°C and the fermentation time is 108 hours; after the fermentation is completed, the fermentation product is collected, centrifuged and the supernatant is taken.

[0105] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0106] The operating steps of the resistivity control algorithm model are as follows:

[0107] S1, the surface resistance of the colloid in the power oil after being divided into n parts is detected, and the surface resistance value of the colloid in the power oil to be detected is extracted and set as (x1, x2, x3, ..., x n ), where x i is the surface resistance value of the colloid in the i-th portion of power oil, and the total surface resistance value of the colloid in each portion of power oil is calculated. The calculation formula for the total surface resistance value of the colloid in the i-th portion of power oil is: Where r is the radius of the microbial raw material culture dish, k is the volume of electric oil per unit area on the surface of the colloid;

[0108] S2, extract the resistance value sequence of each portion of power oil (s1, s2, s3, ..., s n ), from which the minimum value s of the resistance value sequence of each power oil is extracted min , add ns to the surface of the colloid min The microbial raw materials were stirred and allowed to stand for 20 minutes;

[0109] S3. Repeat the operations S1-S2 until the surface resistance of the colloid extracted from the power oil to be tested is within the qualified value required for the change evaluation, and the evaluation operation is completed.

[0110] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0111] In step S1, the method of dividing into n equal parts is as follows:

[0112] Insulating glass panels are selected in the vertical direction to isolate the oil used for electricity, with the isolation distance being 20 cm.

[0113] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0114] The operating steps of the resistivity optimization algorithm model are as follows:

[0115] During the elution process of the resistivity test electrode, the solution is irradiated with a monochromatic light irradiation plate with a uniformly distributed monochromatic light lamp on the surface. The obtained monochromatic light emission intensity sequence is (I1, I2, I3, ..., I n ), where n is the number of monochromatic lamps on the illumination board, I iis the emission intensity of the i-th monochromatic light, and at the same time, the thickness k of the solution absorption pool is collected, and at the same time, the light receiver collects the light intensity sequence after passing through the solution (L1, L2, L3, ..., L n ), where L i is the received light intensity of the i-th light receiver, and the i-th monochromatic light lamp corresponds to the position of the i-th light receiver;

[0116] Calculate the average transmittance of the solution. The concentration of the substance in the solution is calculated in real time, because the incident light intensity I, the output light intensity L, the thickness a of the reactor, the concentration b of the solvent and the absorption coefficient c in the solution satisfy the formula: The concentration of the absorbing solvent is obtained from this Substitute Q into Wherein, the concentration of the solvent in the eluted solution is obtained: b i Compare with the required concentration in real time. If the obtained b i If the difference from the required concentration is less than the set value, the elution is complete.

[0117] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0118] After the elution process, the uniformity of the power oil solution is also tested:

[0119] The solution is divided into m blocks with equal spacing in the longitudinal direction. The incident light intensity I and the outgoing light intensity L are collected and substituted into the average transmittance formula to calculate the average transmittance of the j-th solution, which is recorded as Q j , calculate the uniformity of the solution, the uniformity calculation formula is: The calculated uniformity is compared with the set uniformity threshold. If the calculated uniformity is greater than or equal to the set uniformity threshold, it means that the uniformity is unqualified and needs to be stirred; if the calculated uniformity is less than the set uniformity threshold, it means that the uniformity is qualified and no stirring is required and it can be used directly.

[0120] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0121] The method for assembling the test analysis base material described in step (1) is as follows:

[0122] Pour the colloid and microbial raw materials into a mold and mix them at high temperature, wherein the high temperature mixing is 70°C, and then cool them down.

[0123] Example 3

[0124] like Figure 1 As shown in the figure, the method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0125] The following steps are involved:

[0126] (1) Prepare colloid and microbial raw materials and form test and analysis base materials;

[0127] (2) Adding a resistivity test electrode to the test analysis base material obtained in step (1), and combining the resistivity control algorithm model with the resistivity optimization algorithm model to evaluate the change in volume resistivity of the power oil.

[0128] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0129] The colloid described in step (1) comprises the following raw materials in parts by weight:

[0130]

[0131] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0132] The preparation method of the colloid described in step (1) is as follows:

[0133] The xanthan gum was melted at 70°C to obtain xanthan gum liquid. Then, hydrofluoric acid was used as a dispersant. The hydrofluoric acid was mixed with tetrabutylammonium hydroxide and polyethyleneimine and transferred into the xanthan gum liquid. Ultrasonic dispersion was performed at 250w for 30 minutes. Then, hexadecyltrimethylammonium bromide was added, a clean glass slide was inserted, and the mixture was placed in a constant temperature drying oven at 50°C and dried for 4 hours.

[0134] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0135] The microbial raw materials described in step (1) include the following raw materials in parts by weight:

[0136] 5 parts of plant lactobacillus,

[0137] 4 parts of Streptococcus citriodora,

[0138] 13 copies of Burkholderia gladiolus.

[0139] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0140] The preparation method of the microbial raw material is as follows:

[0141] Prepare Lactobacillus plantarum, Streptococcus citriodora and Burkholderia gladiolus, add them into LB broth at a mass ratio of 1:130 for fermentation, wherein the fermentation temperature is 37°C and the fermentation time is 92 hours; after the fermentation is completed, the fermentation product is collected, centrifuged and the supernatant is taken.

[0142] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0143] The operating steps of the resistivity control algorithm model are as follows:

[0144] S1, the surface resistance of the colloid in the power oil after being divided into n parts is detected, and the surface resistance value of the colloid in the power oil to be detected is extracted and set as (x1, x2, x3, ..., x n ), where x i is the surface resistance value of the colloid in the i-th portion of power oil, and the total surface resistance value of the colloid in each portion of power oil is calculated. The calculation formula for the total surface resistance value of the colloid in the i-th portion of power oil is: Where r is the radius of the microbial raw material culture dish, k is the volume of electric oil per unit area on the surface of the colloid;

[0145] S2, extract the resistance value sequence of each portion of power oil (s1, s2, s3, ..., s n ), from which the minimum value s of the resistance value sequence of each power oil is extracted min , add ns to the surface of the colloid min The microbial raw materials were stirred and allowed to stand for 15 minutes;

[0146] S3. Repeat the operations S1-S2 until the surface resistance of the colloid extracted from the power oil to be tested is within the qualified value required for the change evaluation, and the evaluation operation is completed.

[0147] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0148] In step S1, the method of dividing into n equal parts is as follows:

[0149] Insulating glass panels are selected in the vertical direction to isolate the oil used for electricity, with the isolation distance being 20 cm.

[0150] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0151] The operating steps of the resistivity optimization algorithm model are as follows:

[0152] During the elution process of the resistivity test electrode, the solution is irradiated with a monochromatic light irradiation plate with a uniformly distributed monochromatic light lamp on the surface. The obtained monochromatic light emission intensity sequence is (I1, I2, I3, ..., I n ), where n is the number of monochromatic lamps on the illumination board, I i is the emission intensity of the i-th monochromatic light, and at the same time, the thickness k of the solution absorption pool is collected, and at the same time, the light receiver collects the light intensity sequence after passing through the solution (L1, L2, L3, ..., L n ), where L i is the received light intensity of the i-th light receiver, and the i-th monochromatic light lamp corresponds to the position of the i-th light receiver;

[0153] Calculate the average transmittance of the solution. The concentration of the substance in the solution is calculated in real time, because the incident light intensity I, the output light intensity L, the thickness a of the reactor, the concentration b of the solvent and the absorption coefficient c in the solution satisfy the formula: The concentration of the absorbing solvent is obtained from this Substitute Q into Wherein, the concentration of the solvent in the eluted solution is obtained: b i Compare with the required concentration in real time. If the obtained b i If the difference from the required concentration is less than the set value, the elution is complete.

[0154] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0155] After the elution process, the uniformity of the power oil solution is also tested:

[0156] The solution is divided into m blocks with equal spacing in the longitudinal direction. The incident light intensity I and the outgoing light intensity L are collected and substituted into the average transmittance formula to calculate the average transmittance of the j-th solution, which is recorded as Q j , calculate the uniformity of the solution, the uniformity calculation formula is: The calculated uniformity is compared with the set uniformity threshold. If the calculated uniformity is greater than or equal to the set uniformity threshold, it means that the uniformity is unqualified and needs to be stirred; if the calculated uniformity is less than the set uniformity threshold, it means that the uniformity is qualified and no stirring is required and it can be used directly.

[0157] The above-mentioned method for evaluating the volume resistivity change of electric power oil based on colloid and microbial analysis is

[0158] The method for assembling the test analysis base material described in step (1) is as follows:

[0159] Pour the colloid and microbial raw materials into a mold and mix them at high temperature, wherein the high temperature mixing is 65°C, and then cool them down.

[0160] The changes in volume resistivity of oil used for power generation were tested in the schemes designed in Examples 1-3, and the results are as follows:

[0161] Example 1: The error rate with the true value is 0.5%;

[0162] Example 2: The error rate with the true value is 0.3%;

[0163] Example 3: The error rate with the true value is 0.2%;

[0164] At the same time, the changes in the volume resistivity of electric oil when the resistivity control algorithm model is not selected and the resistivity optimization algorithm model is not selected are set. The error rates between them and the true values ​​are as high as 6.52% and 3.20% respectively.

[0165] In addition, combined Figure 2 Taking Example 3 with the best effect as an example, it shows the distribution granularity of the average error. It can be seen that the distribution of the average error is relatively uniform, which is convenient for conducting three repetitions, five repetitions and ten repetitions of experimental verification during formal testing.

[0166] The above is a schematic description of the present invention and its embodiments. This description is not restrictive and only illustrates one embodiment of the present invention. The actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without creatively designing them, they shall fall within the scope of protection of the present invention.

Claims

1. A method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis, characterized by: The following steps are involved: (1) Prepare colloid and microbial raw materials and form test and analysis base materials; (2) adding a resistivity test electrode to the test analysis base material obtained in step (1), and evaluating the change in volume resistivity of electric power oil by combining the resistivity control algorithm model and the resistivity optimization algorithm model; The operating steps of the resistivity control algorithm model are as follows: S1, the surface resistance of the colloid in the power oil after being divided into n parts is detected, and the surface resistance value of the colloid in the power oil to be detected is extracted and set as (x1, x2, x3, ..., x n ), where x i is the surface resistance value of the colloid in the i-th portion of power oil, and the total surface resistance value of the colloid in each portion of power oil is calculated. The calculation formula for the total surface resistance value of the colloid in the i-th portion of power oil is: Where r is the radius of the culture dish of the microbial raw material, k is the volume of the electric oil per unit area of ​​the colloid surface; S2, extract the resistance value sequence of each portion of power oil (s1, s2, s3, ..., s n ), from which the minimum value s of the resistance value sequence of each power oil is extracted min , add ns to the surface of the colloid min The microbial raw materials are stirred and allowed to stand for 10-20 minutes; S3. Repeat the operations S1-S2 until the surface resistance of the colloid extracted from the power oil to be tested is within the qualified value required for the change evaluation, and the evaluation operation is completed.

2. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 1, characterized in that: The colloid described in step (1) comprises the following raw materials in parts by weight:

3. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 2, characterized in that: The preparation method of the colloid described in step (1) is as follows: Melt the xanthan gum at 60-80°C to obtain xanthan gum liquid. Then, use hydrofluoric acid as a dispersant, mix the hydrofluoric acid with tetrabutylammonium hydroxide and polyethyleneimine and transfer it to the xanthan gum liquid. Ultrasonic dispersion is performed at 200w-300w for 20min-40min. Then, hexadecyltrimethylammonium bromide is added, a clean glass slide is inserted, and the mixture is placed in a constant temperature drying oven at 40°C-60°C and dried for 2h-6h.

4. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 1, characterized in that: The microbial raw materials described in step (1) include the following raw materials in parts by weight: 2-8 portions of plant lactobacillus, 1-6 parts of Streptococcus citriodora, 10-15 parts of Burkholderia gladiolus.

5. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 4, characterized in that: The preparation method of the microbial raw material is as follows: Prepare Lactobacillus plantarum, Streptococcus citriodora and Burkholderia gladiolus, add them into LB broth at a mass ratio of 1:(100-150) for fermentation, wherein the fermentation temperature is 37°C and the fermentation time is 72h-108h; after the fermentation is completed, the fermentation product is collected, centrifuged and the supernatant is taken.

6. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 1, characterized in that: In step S1, the method of dividing into n equal parts is as follows: Insulating glass panels are selected in the vertical direction to isolate the oil used for electricity, with the isolation distance being 20 cm.

7. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 1, characterized in that: The operating steps of the resistivity optimization algorithm model are as follows: During the elution process of the resistivity test electrode, the solution is irradiated with a monochromatic light irradiation plate with a uniformly distributed monochromatic light lamp on the surface. The obtained monochromatic light emission intensity sequence is (I1, I2, I3, ..., I n ), where n is the number of monochromatic lamps on the illumination board, I i is the emission intensity of the i-th monochromatic light, and at the same time, the thickness k of the solution absorption pool is collected, and at the same time, the light receiver collects the light intensity sequence after passing through the solution (L1, L2, L3, ..., L n ), where L i is the received light intensity of the i-th light receiver, and the i-th monochromatic light lamp corresponds to the position of the i-th light receiver; Calculate the average transmittance of the solution. The concentration of the substance in the solution is calculated in real time, because the incident light intensity I, the output light intensity L, the thickness a of the reactor, the concentration b of the solvent and the absorption coefficient c in the solution satisfy the formula: The concentration of the absorbing solvent is obtained from this Substitute Q into Wherein, the concentration of the solvent in the eluted solution is obtained: b i Compare with the required concentration in real time. If the obtained b i If the difference from the required concentration is less than the set value, the elution is complete.

8. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 7, characterized in that: After the elution process, the uniformity of the power oil solution is also tested: The solution is divided into m blocks with equal spacing in the longitudinal direction. The incident light intensity I and the outgoing light intensity L are collected and substituted into the average transmittance formula to calculate the average transmittance of the j-th solution, which is recorded as Q j , calculate the uniformity of the solution, the uniformity calculation formula is: The calculated uniformity is compared with the set uniformity threshold. If the calculated uniformity is greater than or equal to the set uniformity threshold, it means that the uniformity is unqualified and needs to be stirred; if the calculated uniformity is less than the set uniformity threshold, it means that the uniformity is qualified and no stirring is required and it can be used directly.

9. The method for evaluating changes in volume resistivity of electric power oil based on colloid and microbial analysis according to claim 1, characterized in that: The method for assembling the test analysis base material described in step (1) is as follows: Pour the colloid and microbial raw materials into a mold and mix them at high temperature, wherein the high temperature mixing is 60℃-70℃, and then cool them down.

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