CN113930276B - Naphthenic transformer oil composition and application - Google Patents
Naphthenic transformer oil composition and application Download PDFInfo
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- CN113930276B CN113930276B CN202010677848.3A CN202010677848A CN113930276B CN 113930276 B CN113930276 B CN 113930276B CN 202010677848 A CN202010677848 A CN 202010677848A CN 113930276 B CN113930276 B CN 113930276B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/106—Naphthenic fractions
- C10M2203/1065—Naphthenic fractions used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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Abstract
The invention provides a naphthenic base transformer oil composition, which comprises naphthenic base transformer oil base oil and light naphthenic base oil; aromatic carbon C in the structural family composition of the naphthenic base transformer oil base oil A 3-6% of mass content and alkyl chain carbon C P The mass content is not more than 50%; the pour point of the base oil of the naphthenic transformer oil is not higher than-40 ℃, and the kinematic viscosity at 40 ℃ is not more than 10mm 2 The kinematic viscosity at-30 ℃ is not more than 1800mm 2 S, sulfur content is not more than 200mg/kg; aromatic carbon C in the light naphthenic base oil structural family composition A Mass content not more than 2%, and alkane chain carbon C P The mass content is not more than 50%; the light naphthenic base oil has the viscosity of not more than 6mm at 40 DEG C 2 The flash point of the closed port is not lower than 135 ℃, and the distillation range is not higher than 20 ℃. The naphthenic transformer oil composition can meet the requirements of IEC60296: the grade index requirement of I-40 ℃ transformer oil (special application) in 2012 standard.
Description
Technical Field
The invention relates to high-grade transformer oil for extremely cold regions, in particular to a naphthenic transformer oil composition and application thereof.
Background
The transformer oil in the market is divided into naphthenic base transformer oil, intermediate-grade transformer oil and paraffin base transformer oil according to the composition of a structural group, wherein the composition of the structural group (the analysis method is DL/T929) contains alkane chain carbon C P The content of the alkyl chain carbon is less than 50 percentC P 50 to 56 percent of the catalyst is a midgroup, and the carbon C of an alkyl chain P Greater than 56% is paraffin-based.
The transformer oil mainly plays the role of insulation and cooling in electrical equipment such as transformers and reactors. In order to ensure long-period safe operation of electrical equipment, the transformer oil must have excellent low-temperature performance to meet the requirement of low-temperature starting of the electrical equipment; the kinematic viscosity and viscosity index are low, so that heat dissipation and cooling of electrical equipment are facilitated; excellent electrical properties; the insulation requirement of electrical equipment is met; the gas evolution resistance is better, and hydrogen generated by partial discharge is absorbed, so that the phenomenon that the insulation of electrical equipment is damaged by air gap discharge is prevented; better oxidation stability, slowing down the oxidation of oil products as much as possible, reducing the generation of oil sludge and being beneficial to the long-term and safe operation of electrical equipment. The oil sludge dissolving agent has proper oil sludge dissolving performance, and can dissolve oil sludge formed in the long-period running process of electrical equipment so as to avoid damaging insulating materials and influencing heat transfer. Among the above properties of transformer oil, the electrical properties, oxidation resistance, gassing resistance and solubility are contradictory, i.e. to ensure better electrical properties and oxidation resistance, the transformer oil needs to be deeply refined, and the aromatic hydrocarbon content is low; in order to ensure the anti-gassing property and the solubility property, a certain content of aromatic hydrocarbon needs to be reserved in the transformer oil. Therefore, in order to meet the performances, the composition of the transformer oil needs to contain higher cycloalkane (ensuring the solubility), proper isoparaffin content (ensuring the low-temperature viscosity) and proper arene content (ensuring the anti-gassing performance). A high-quality transformer oil is actually the balance of the solubility, anti-gassing and electrical and anti-oxidation properties, and only the naphthenic transformer oil can balance the properties.
International Electrotechnical Commission (IEC) transformer oil standard IEC60296: the 2012 standard divides the transformer oil added with the antioxidant into transformer oil at I-0 ℃, I-20 ℃, I-30 ℃ and I-40 ℃ according to the lowest cold start temperature. Wherein the I-40 deg.C transformer oil is mainly applied to electric equipment such as transmission and distribution transformers in extremely cold regions such as northeast China, inner Mongolia and independent body, canada, etc., and locomotive-mounted traction transformers in extremely cold regions, and has a kinematic viscosity of-40 deg.C of not more than 2500mm 2 (ii) a pour point of not higher than-50 ℃. However, the device is not limited to the specific type of the deviceThe viscosity index of the naphthenic transformer oil is low, the low-temperature kinematic viscosity is high, and the kinematic viscosity is reduced to 7mm even at 40 DEG C 2 The kinematic viscosity at-40 ℃ still cannot meet the requirement of less than 2500mm 2 The index requirement is satisfied, and the kinematic viscosity at 40 ℃ is less than 7mm 2 S, which may lead to the pump-down of the electrical equipment. Therefore, the IEC60296 is not met at home and abroad at present: 2012 standard I-40 ℃ high grade naphthenic transformer oil, which is commercially in accordance with IEC60296:2012 standard I-40 deg.C high-grade transformer oil is paraffin-based transformer oil with very low aromatic hydrocarbon content produced by high pressure hydrogenation isomerization dewaxing process, and its viscosity at 40 deg.C is 7-11mm 2 However, the oil has the defects of low aromatic hydrocarbon content, poor gassing resistance, low cycloparaffin content and poor dissolved oil sludge performance, and is difficult to ensure long-period, safe and reliable operation of high-voltage-grade electrical equipment.
Accordingly, there is a need in the art for high grade naphthenic transformer oils for use in extremely cold environments.
Disclosure of Invention
The invention mainly aims to provide a naphthenic transformer oil composition and application thereof, and the naphthenic transformer oil composition can be used for electric equipment such as a power transmission and distribution transformer in an extremely cold region, a locomotive-mounted traction transformer running in the extremely cold region and the like.
In order to achieve the above objects, the present invention provides a cycloalkyl transformer oil composition comprising a cycloalkyl transformer oil base oil and a light cycloalkyl base oil;
aromatic carbon C in the structural family composition of the naphthenic base transformer oil base oil A 3-6% of mass content and alkyl chain carbon C P The mass content is not more than 50%; the pour point of the base oil of the naphthenic transformer oil is not higher than-40 ℃, and the kinematic viscosity at 40 ℃ is not more than 10mm 2 The kinematic viscosity at-30 ℃ is not more than 1800mm 2 S, sulfur content is not more than 200mg/kg;
aromatic carbon C in the light naphthenic base oil structural group composition A Mass content of not more than 2 percent, and alkane chain carbon C P The mass content is not more than 50%; the light naphthenic base oil has the viscosity of not more than 6mm at 40 DEG C 2 S, closed flash point not lowThe distillation range is not more than 20 ℃ at 135 ℃.
The invention relates to a naphthenic transformer oil composition, wherein aromatic carbon C in structural family composition of the naphthenic transformer oil composition A 3-4% of mass content and alkyl chain carbon C P Has a mass content of not more than 50%, a pour point of not more than-55 deg.C, and a viscosity of not more than 2500mm at-40 deg.C 2 /s。
The invention relates to a naphthenic transformer oil composition, wherein the mass ratio of naphthenic transformer oil base oil to light naphthenic base oil is 40-60.
The naphthenic transformer oil composition also comprises an antioxidant, and the content of the antioxidant is 0.08-0.4% based on the total mass of the naphthenic transformer oil composition.
The invention relates to a naphthenic transformer oil composition, wherein an antioxidant is 2,6-di-tert-butyl-p-cresol and/or 2,6-di-tert-butylphenol.
The naphthenic transformer oil composition is produced by using naphthenic base crude oil fractions as raw materials and adopting a solvent refining combination process or a hydrogenation process.
The naphthenic transformer oil composition provided by the invention is characterized in that the solvent refining combined process is 'hydrogenation pre-refining-furfural refining-carclazyte supplement refining'; the partial pressure of hydrogen for hydrogenation pre-refining is 3.0-8.0MPa, the oil ratio (volume ratio) of the furfural refining agent is 2-3:1, and the clay consumption (mass consumption) in clay supplement refining is 3-5%; the hydrogenation process is hydrogenation treatment, the hydrogen partial pressure is 6-15MPa, and the hydrogenation treatment temperature is 300-360 ℃.
The light naphthenic base oil is produced by using a diesel fraction produced by a combined process of high-pressure hydrotreating or cracking-high-pressure hydroisomerization dewaxing-high-pressure hydrofinishing or high-pressure hydrotreating or cracking-hydrodewaxing-high-pressure hydrofinishing as a raw material and then by a precision fractionation process; the combined process has hydrogen partial pressure not lower than 15MPa, diesel oil fraction with distillation range of 200-350 deg.c and pour point not higher than-40 deg.c.
The naphthenic transformer oil composition is characterized in that a fractionation tower plate or a packing theoretical plate of the precise fractionation process is not less than 20, the reflux ratio is not less than 10, and the distillation range of the separated fraction is less than 20 ℃; the naphthenic base crude oil fraction adopted by the naphthenic transformer oil base oil is 260-340 ℃ distillate oil, and the naphthenic base oil fraction adopted by the light naphthenic transformer oil base oil is 350-500 ℃ distillate oil or 100 ℃ kinematic viscosity not more than 60mm 2 Propane deasphalted oil/s.
In order to achieve the above object, the present invention also provides the use of the above-mentioned cycloalkyl transformer oil composition in electrical equipment.
The invention has the beneficial effects that:
the naphthenic transformer oil composition meets the requirements of IEC60296: the grade index of I-40 ℃ (special purpose) in 2012 standard has excellent low-temperature performance and oxidation resistance, and realizes perfect balance of solubility, heat dispersion, electrical performance and oxidation resistance.
Detailed Description
The following examples of the present invention are described in detail, and the present invention is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and procedures are given, but the scope of the present invention is not limited to the following examples, and the following examples are experimental methods without specific conditions noted, and generally follow conventional conditions.
The invention discloses a naphthenic base transformer oil composition, which comprises naphthenic base transformer oil base oil and light naphthenic base oil;
aromatic carbon C in the structural group composition of the naphthenic base transformer oil base oil A 3-6% of mass content and alkyl chain carbon C P The mass content is not more than 50%; the pour point of the base oil of the naphthenic transformer oil is not higher than-40 ℃, and the kinematic viscosity at 40 ℃ is not higher than10mm 2 The kinematic viscosity at-30 ℃ is not more than 1800mm 2 S, the sulfur content is not more than 200mg/kg;
aromatic carbon C in the light naphthenic base oil structural family composition A Mass content of not more than 2 percent, and alkane chain carbon C P The mass content is not more than 50%; the light naphthenic base oil has the viscosity of not more than 6mm at 40 DEG C 2 S, or not more than 5.5mm 2 The flash point of the closed port is not lower than 135 ℃, and the distillation range is not more than 20 ℃.
In one embodiment, the naphthenic transformer oil base oil is produced by using naphthenic base crude oil fractions as raw materials and adopting a solvent refining combined process or a hydrogenation process. In one embodiment, the naphthenic base crude oil fraction is 260-340 ℃ distillate oil, and the distillate oil is used as a raw material to carry out a solvent refining combined process or a hydrogenation process. Wherein, the solvent refining combined process comprises 'hydrogenation pre-refining-furfural refining-carclazyte supplement refining'. In one embodiment, the hydrogen partial pressure of hydrogenation pre-refining is 3.0-8.0MPa, the volume ratio of the furfural refined solvent oil is 2-3:1, and the mass consumption of the clay in the clay supplement refining is 3-5%. The hydrogenation process is hydrogenation treatment, the hydrogen partial pressure is 6-15MPa, and the hydrogenation treatment temperature is 300-360 ℃.
In one embodiment, the naphthenic base crude oil fraction used for the naphthenic transformer oil base oil is, for example, 260 to 340 ℃ distillate oil obtained by atmospheric distillation of naphthenic base oil, and the naphthenic base oil is not particularly limited in the present invention.
In one embodiment, the light naphthenic base oil is produced by using naphthenic base crude oil fractions as raw materials and adopting a combined process of 'high-pressure hydrotreating or cracking-high-pressure hydroisomerization dewaxing-high-pressure hydrogenation complementary refining' or 'high-pressure hydrotreating or cracking-hydrodewaxing-high-pressure hydrogenation complementary refining' to produce diesel fractions and then performing a precision fractionation process.
In one embodiment, the naphthenic base oil fraction used for the light naphthenic base oil is 350-500 ℃ distillate oil. In another embodiment, the raw material is a propane deasphalted oil obtained by subjecting the vacuum residue of naphthenic crude oil to a propane deasphalting process, and the naphthenic crude oil is not particularly limited in the present invention.
Wherein the hydrogen partial pressure in the combined process of high-pressure hydrotreating or cracking-high-pressure hydroisomerization dewaxing-high-pressure hydrofinishing or high-pressure hydrotreating or cracking-hydrodewaxing-high-pressure hydrofinishing is not lower than 15MPa. Namely, the hydrogen partial pressure in the high-pressure hydrogenation or cracking process, the high-pressure hydroisomerization process, the high-pressure hydrogenation complementary refining process, the high-pressure hydrogenation or cracking process, the hydrodewaxing process and the high-pressure hydrogenation complementary refining process in the combined process is not lower than 15MPa respectively. The oil product obtained by the combined process is distilled under normal pressure, the fraction with the distillation range of 200-350 ℃ is collected as diesel fraction, the pour point of the diesel component is not higher than-40 ℃, and the diesel fraction is low aromatic hydrocarbon diesel fraction.
Then the diesel oil fraction obtained by the method is subjected to a precise fractionation process. In one embodiment, the precision fractionation process has no less than 20 fractionation trays or packing theoretical trays, a reflux ratio of no less than 10. The obtained middle distillate is the light naphthenic base oil with low viscosity, low aromatic hydrocarbon and narrow distillate.
In one embodiment, in the naphthenic transformer oil composition of the present invention, the mass ratio of the naphthenic transformer oil base oil to the light naphthenic base oil is 40 to 60. In another embodiment, the naphthenic transformer oil composition further comprises an antioxidant, and the content of the antioxidant is 0.08% -0.4% by mass of the total naphthenic transformer oil composition.
In one embodiment, the antioxidant is 2,6-di-tert-butyl-p-cresol and/or 2,6-di-tert-butylphenol.
The invention relates to a naphthenic transformer oil composition C A Content of 3% -5%, alkyl chain carbon C P The content is not more than 50%, the pour point is not higher than-55 ℃, and the viscosity at-40 ℃ is not more than 2500mm 2 /s。
Thus, the invention provides a naphthenic transformer oil composition, and aromatic carbon C in the structural family composition of the naphthenic transformer oil composition A 3-5% or 3-4% of alkyl chain carbon C P The content is not more than 50%, and thus the cycloalkyl characteristics can be maintained. In addition, the cycloalkyl of the inventionThe transformer oil composition has excellent low-temperature performance and oxidation resistance, realizes perfect balance of solubility, heat dispersion, electrical performance and oxidation resistance, and conforms to IEC60296: the standard of 2012, the I-40 deg.C (special purpose) grade index requirement, can be used for the condition of using electric equipment in extremely cold region.
The technical solution of the present invention is further described in detail by the following specific examples.
Example 1
By adopting 260-360 ℃ distillate oil of naphthenic base crude oil as a raw material and adopting a combined process of 'hydrogenation pre-refining-furfural refining-clay supplement refining', the hydrogen partial pressure of hydrogenation pre-refining is 3.0MPa, the oil ratio (volume) of a furfural refining agent is 2.5, the using amount (mass) of clay supplement refining clay is 3%, and the properties of the produced naphthenic transformer oil base oil containing proper amount of aromatic hydrocarbon are shown in the following table 1; naphthenic base crude oil distillate oil with the temperature of 350-500 ℃ is adopted as a raw material, and a combined process of high-pressure hydrogenation treatment, high-pressure hydrogenation isodewaxing and high-pressure hydrogenation supplement refining is carried out, wherein the partial pressure of high-pressure hydrogenation hydrogen in the combined process is 15MPa, the temperature of a high-pressure hydrogenation treatment section is 360 ℃, the temperature of the high-pressure hydrogenation isodewaxing section is 290 ℃, the temperature of a high-pressure hydrogenation supplement refining section is 260 ℃, the distillation range of the produced diesel oil distillate is 200-350 ℃, and the pour point is-50 ℃; the diesel oil fraction passes through a precise fractionation device, the device adopts a packed tower with 20 theoretical plates and a reflux ratio of 5:1, and the properties of the separated high-pressure hydrogenated low-aromatic hydrocarbon, low-viscosity and narrow-fraction light naphthenic base oil are shown in the following table 1; the naphthenic transformer oil base oil containing a proper amount of aromatic hydrocarbon and high-pressure hydrogenated low-aromatic hydrocarbon, low-viscosity and narrow-fraction light naphthenic base oil are blended according to the mass ratio of 50, and then 0.3% of 2, 6-di-tert-butyl-p-cresol antioxidant is added, and the properties of the blended high-grade naphthenic transformer oil for extremely cold regions and the common transformer oil as comparison oil are shown in table 1.
Example 2
The naphthenic base oil with 260-360 ℃ distillate oil is adopted as a raw material, the hydrotreating hydrogen partial pressure is 12.0MPa, the hydrotreating temperature is 320 ℃, and the properties of the produced naphthenic transformer oil base oil containing a proper amount of aromatic hydrocarbon are shown in the following table 2; by using a 100 ℃ conveyerThe dynamic viscosity is 48mm 2 The method is characterized in that the propane deasphalted oil of the/s naphthenic base crude oil is used as a raw material, and the combined process of high-pressure hydrogenation treatment, high-pressure hydrogenation isomerization dewaxing and high-pressure hydrogenation supplement refining is carried out, wherein the partial pressure of high-pressure hydrogenation hydrogen in the combined process is 15MPa, the temperature of a high-pressure hydrogenation treatment section is 380 ℃, the temperature of a high-pressure isomerization dewaxing section is 310 ℃, the temperature of a high-pressure hydrogenation supplement refining section is 280 ℃, the distillation range of produced diesel oil fraction is 200-350 ℃, and the pour point is-50 ℃; the diesel oil fraction passes through a precise fractionation device, the device adopts a packed tower with 20 theoretical plates and a reflux ratio of 5:1, and the properties of the separated high-pressure hydrogenated low-aromatic hydrocarbon, low-viscosity and narrow-fraction light naphthenic base oil are shown in the following table 2; blending naphthenic base transformer oil base oil containing a proper amount of aromatic hydrocarbon and high-pressure hydrogenated low-aromatic hydrocarbon, low-viscosity and narrow-fraction light naphthenic base oil according to the mass ratio of 50, then adding 0.3% of 2,6-ditert-butyl-p-cresol antioxidant, wherein the properties of the blended high-grade naphthenic transformer oil for extremely cold regions and the comparative oil common transformer oil are shown in table 2.
Table 1 iec60296:2012 standard and transformer oil composition properties
Note: c A -aromatic carbon; c P -carbon of an alkane chain; c N -a naphthenic carbon.
Table 2 iec60296:2012 standard and transformer oil composition properties
Note: c A -aromatic carbon; c P -carbon of an alkane chain; c N -a naphthenic carbon.
As can be seen from the data in tables 1 and 2, the naphthenic transformer oil obtained in examples 1 and 2 of the present application satisfies IEC60296: i-40 ℃ transformer oil (special requirements) grade requirements in the 2012 standard.
Specifically, in tables 1 and 2, light cycloalkyl base oils, cycloalkyl transformer oil base oils, and cycloalkyl transformer oil compositions were obtained from examples 1 and 2 of the present application. From the data in tables 1 and 2, the kinematic viscosity of the comparative oil, which is a common low-viscosity naphthenic transformer oil, is reduced to 7.370mm even at 40 DEG C 2 The kinematic viscosity at 40 ℃ below zero is still far higher than the standard requirement; while the light naphthenic base oil with low aromatic hydrocarbon, low viscosity and narrow fraction can meet the standard requirement of kinematic viscosity at the temperature of-40 ℃, but the kinematic viscosity at the temperature of 40 ℃ is only 5.5mm 2 S, not less than 7mm far lower than the general requirement of transformer oil 2 S, low aromatic hydrocarbon content and poor gassing resistance; the naphthenic transformer oil composition blended by the naphthenic transformer oil base oil containing a proper amount of aromatic hydrocarbon and the light naphthenic transformer oil base oil produced by the traditional process can meet the requirements of IEC60296: the indexes of I-40 ℃ (special purpose) in 2012 standard are required, and compared with light naphthenic base oil, the naphthenic base oil has the characteristics of proper viscosity, good gassing resistance, low cost and large-scale production.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A naphthenic transformer oil composition comprising a naphthenic transformer oil base oil and a light naphthenic base oil;
aromatic carbon C in the structural family composition of the naphthenic base transformer oil base oil A 3-6% of mass content and alkyl chain carbon C P The mass content is not more than 50%; the pour point of the base oil of the naphthenic transformer oil is not higher than-40 ℃, and the kinematic viscosity at 40 ℃ is not more than 10mm 2 The kinematic viscosity at-30 ℃ is not more than 1800mm 2 S, sulfur content is not more than 200mg/kg;
aromatic carbon C in the light naphthenic base oil structural family composition A Mass content not more than 2%, and alkane chain carbon C P The mass content is not more than 50%; the light naphthenic base oil has the viscosity of not more than 6mm at 40 DEG C 2 The flash point of the closed port is not lower than 135 ℃, and the distillation range is not more than 20 ℃;
the light naphthenic base oil is prepared by using a propane deasphalted oil obtained by subjecting naphthenic base crude oil fractions or naphthenic base crude oil vacuum residue to a propane deasphalting process as a raw material, producing diesel oil fractions by adopting a combined process of high-pressure hydrotreating or cracking-high-pressure hydroisomerization dewaxing-high-pressure hydrogenation complementary refining or high-pressure hydrotreating or cracking-hydrodewaxing-high-pressure hydrogenation complementary refining, and then producing the diesel oil fractions by a precision fractionation process; the combined process has hydrogen partial pressure not lower than 15MPa, diesel oil fraction with distillation range of 200-350 deg.c and pour point not higher than-40 deg.c.
2. The naphthenic transformer oil composition of claim 1, wherein aromatic carbon C is in a structural group composition of the naphthenic transformer oil composition A 3-4% of mass content and alkyl chain carbon C P Has a mass content of not more than 50%, a pour point of not more than-55 deg.C, and a viscosity of not more than 2500mm at-40 deg.C 2 /s。
3. The naphthenic transformer oil composition of claim 1, wherein the mass ratio of the naphthenic transformer oil base oil to the light naphthenic base oil is 40-60.
4. The naphthenic transformer oil composition of claim 1, further comprising an antioxidant in an amount of 0.08% to 0.4% based on the total mass of the naphthenic transformer oil composition.
5. The naphthenic transformer oil composition of claim 4, wherein the antioxidant is 2,6-di-tert-butyl-p-cresol and/or 2,6-di-tert-butylphenol.
6. The naphthenic transformer oil composition of claim 1, wherein the naphthenic transformer oil base oil is produced by using a combined solvent refining process or a hydrogenation process from a naphthenic crude oil fraction as a raw material.
7. The naphthenic transformer oil composition of claim 6, wherein the solvent refining combination process is "hydro-pre-refining-furfural refining-clay-make-up refining"; the partial pressure of hydrogen for hydrogenation pre-refining is 3.0-8.0MPa, the volume ratio of agent oil for furfural refining is 2-3:1, and the mass consumption of the white clay in the white clay supplement refining is 3-5%; the hydrogenation process is hydrogenation treatment, the hydrogen partial pressure is 6-15MPa, and the hydrogenation treatment temperature is 300-360 ℃.
8. The naphthenic transformer oil composition of claim 1, wherein the precision fractionation process has no less than 20 fractionation trays or packing theoretical trays, a reflux ratio of no less than 10; the naphthenic base crude oil fraction adopted by the naphthenic transformer oil base oil is 260-340 ℃ distillate oil, and the naphthenic base oil fraction adopted by the light naphthenic transformer oil base oil is 350-500 ℃ distillate oil or 100 ℃ kinematic viscosity not more than 60mm 2 Propane deasphalted oil/s.
9. Use of the cycloalkyl transformer oil composition according to any one of claims 1 to 8 in an electrical device.
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| CN113930276A (en) | 2022-01-14 |
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