CN108806948B - Castable layer, preparation method thereof and transformer with same - Google Patents
Castable layer, preparation method thereof and transformer with same Download PDFInfo
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- CN108806948B CN108806948B CN201810565723.4A CN201810565723A CN108806948B CN 108806948 B CN108806948 B CN 108806948B CN 201810565723 A CN201810565723 A CN 201810565723A CN 108806948 B CN108806948 B CN 108806948B
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- SEILKFZTLVMHRR-UHFFFAOYSA-N 2-phosphonooxyethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOP(O)(O)=O SEILKFZTLVMHRR-UHFFFAOYSA-N 0.000 claims abstract description 11
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/44—Measuring, controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/30—Applications used for thermoforming
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Insulating Of Coils (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a casting material layer which is prepared from the following components in parts by weight: 100-110 parts of E-51 epoxy resin, 4-5 parts of ethylene glycol methacrylate phosphate, 2-2.5 parts of vinyl neodecanoate, 31-35 parts of methyl tetrahydrophthalic anhydride, 5-6 parts of DMP-30 accelerator, 3-4 parts of tetraethylammonium bromide, 3-4 parts of diphenylthiourea, 14-16 parts of glycidyl neodecanoate, 6-8 parts of cocoamine polyoxyethylene ether, 4-5 parts of silicon carbide powder with the average particle size of 50 nanometers, 10-12 parts of zirconium nitride powder with the average particle size of 800 nanometers and 4-5 parts of magnesium oxide powder with the average particle size of 80 nanometers. The invention also discloses a preparation method of the castable layer and a transformer with the castable layer. The casting material layer has good thermal conductivity and mechanical property, and the transformer has excellent ageing resistance.
Description
The invention relates to a divisional application of a patent with the application number of 2016100203734 and the application date of 2016, 01 and 13, and the patent is named as 'a power transformer'.
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a power transformer.
Background
The transformer noise has three sound sources, namely an iron core, a winding and a cooler, namely the sum of noise caused by no-load, load and a cooling system. The noise generated by the iron core is caused by the tiny change, namely magnetostriction, under the action of an alternating magnetic field of the silicon steel sheets forming the iron core, the magnetostriction enables the iron core to periodically vibrate along with the change of the excitation frequency, and the magnetostriction deformation of the iron core and the electromagnetic force in a winding, an oil tank and a magnetic shield. The reason for the vibration of the winding is that electromagnetic force is generated in the current winding, and the structural part can also vibrate due to the leakage magnetic field. The electromagnetic noise is generated by the magnetic field inducing the core laminations to vibrate longitudinally to generate noise, and the amplitude of the vibration is related to the magnetic flux density in the core laminations and the magnetic performance of the core material, but is not related to the load current. The electromagnetic force (and vibration amplitude) is proportional to the current squared, while the emitted acoustic power is proportional to the vibration amplitude squared. Core noise is a major source of transformer noise. Epoxy resin is a chemical raw material which is widely used for a long time, is a flame-retardant and flame-retardant material, has excellent electrical properties, and is gradually adopted by the electrical manufacturing industry. Since the first epoxy cast dry change made in germany in 1964, this technology has developed rapidly in europe and new patented manufacturing technologies have been continuously introduced and are also being pushed to the world. Since the dry-type transformer manufacturing technology in China is mainly introduced from European countries such as Germany, most of dry-type transformers produced nationwide are epoxy-cast type transformers.
Patent CN102360835 discloses an epoxy resin castable for a dry-type transformer, which mainly comprises bisphenol a epoxy resin, aluminum nitride powder, quartz sand, mica powder, amine curing agent and active toughening agent, wherein the aluminum nitride powder and the quartz sand with different particle sizes are used for increasing the heat-conducting property, and the castable has the advantages of good heat resistance, good heat dissipation, equivalent thermal expansion coefficient to copper materials and the like. Patent CN102515626 discloses a high thermal conductivity epoxy resin castable for a dry type transformer, which adopts high thermal conductivity inorganic powder to replace common silica micropowder as a filler, so as to improve the thermal conductivity coefficient of the castable. The high heat conductivity inorganic powder is alumina powder, aluminum nitride powder or boron nitride powder. The heat conductivity coefficient of the high-heat-conductivity epoxy resin reaches 1.1-1.3W/mK, and the temperature rise of the transformer can be reduced. Patent 201410678408.4 discloses a low noise dry type transformer, which has a shock absorber installed at the bottom of the transformer, so that the vibration generated during the operation of the transformer can be offset, thereby eliminating the noise, prolonging the service life of the transformer and reducing the failure rate.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a power transformer with excellent ageing resistance and low noise.
The power transformer comprises an iron core, an upper clamping piece and a lower clamping piece, wherein the upper clamping piece is used for clamping the upper end of the iron core, the lower clamping piece is used for clamping the lower end of the iron core, a transformer coil surrounds the iron core, an upper insulating cushion block is arranged at the top of the transformer coil, a lower insulating cushion block is arranged at the bottom of the transformer coil, a base is arranged at the bottom of the lower clamping piece, a cooling fan is arranged on the side surface of the lower clamping piece, and an outlet copper bar is arranged on the; the transformer coil comprises a low-voltage winding and a high-voltage winding surrounding the low-voltage winding, and pouring material layers are wrapped outside the low-voltage winding and the high-voltage winding; the noise reduction and heat dissipation layer is wrapped outside the iron core; the noise-reducing heat-dissipating layer comprises four layers from inside to outside, namely a particle noise-reducing layer, a first silica gel cloth layer, a silica gel buffer layer and a second silica gel cloth layer in sequence; the particle noise reduction layer is composed of bentonite with a particle size of 3000 meshes, aluminum nitride with a particle size of 6000 meshes and heat conduction silica gel according to a weight ratio of 3:4: 6; the silica gel buffer layer is heat conduction silica gel. Wherein the particle noise reduction layer is formed by uniformly mixing and curing bentonite with a particle size of 3000 meshes, aluminum nitride with a particle size of 6000 meshes and Dow Corning SE4420 heat-conducting silica gel according to a proportion, and the thickness is 0.3 cm; the silica gel buffer layer is Dow Corning SE9184 heat-conducting silica gel, and the thickness is 0.3 cm; the first and second silica gel cloth layers are both made of silica gel-PadK 10 silica gel.
The invention relates to a power transformer, wherein the casting material layers of a low-voltage winding and a high-voltage winding are prepared from the following components in parts by weight: 100-110 parts of E-51 epoxy resin, 4-5 parts of ethylene glycol methacrylate phosphate, 2-2.5 parts of vinyl neodecanoate, 31-35 parts of methyl tetrahydrophthalic anhydride, 5-6 parts of DMP-30 accelerator, 3-4 parts of tetraethylammonium bromide, 3-4 parts of diphenylthiourea, 14-16 parts of glycidyl neodecanoate, 6-8 parts of cocoamine polyoxyethylene ether, 4-5 parts of silicon carbide powder with the average particle size of 50 nanometers, 10-12 parts of zirconium nitride powder with the average particle size of 800 nanometers and 4-5 parts of magnesium oxide powder with the average particle size of 80 nanometers.
The invention discloses a power transformer, wherein the casting material layers of a low-voltage winding and a high-voltage winding are prepared by the following method:
A. taking 7 parts by weight of cocoamine polyoxyethylene ether, 4.6 parts by weight of silicon carbide powder with the average particle size of 50 nanometers, 11 parts by weight of zirconium nitride powder with the average particle size of 800 nanometers and 4 parts by weight of magnesium oxide powder with the average particle size of 80 nanometers, mixing and stirring uniformly, then adding 15 parts by weight of neodecanoic acid glycidyl ester, and carrying out ultrasonic treatment at 50 ℃ for 40 minutes to obtain a component A;
B. taking 105 parts of E-51 epoxy resin, 4.5 parts of ethylene glycol methacrylate phosphate and 2.2 parts of vinyl neodecanoate according to the parts by weight, and uniformly stirring and mixing to obtain a component B;
C. taking 32 parts of methyl tetrahydrophthalic anhydride, 5.6 parts of DMP-30 accelerator, 3.5 parts of tetraethylammonium bromide and 3.2 parts of diphenylthiourea according to parts by weight, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
The novel castable is prepared by pouring and curing castable prepared by a special formula under vacuum pressure, adopts powder filler composite technology with different particle sizes and types, and simultaneously adopts an optimized curing and reinforcing formula, so that the performance which is difficult to achieve by single powder is achieved; therefore, the heat-conducting material has outstanding heat-conducting performance and excellent mechanical property and ageing resistance. The aging resistance of the transformer coil is improved, and the service life of the dry-type transformer is greatly prolonged. Meanwhile, the noise-reducing and heat-dissipating layer with excellent sound insulation and heat conduction performances is prepared by combining the heat-conducting silica gel with excellent performance and the composite micro powder, and the noise of the transformer core is greatly reduced due to the arrangement of the noise-reducing and heat-dissipating layer.
Drawings
Fig. 1 is a schematic diagram of a power transformer according to the present invention.
FIG. 2 is a schematic view of the structure of the noise reduction and heat dissipation layer of the present invention.
Detailed Description
The following examples are intended to further illustrate the present invention and should not be construed as limiting the scope of the invention, and other insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are intended to be covered thereby.
Example 1: as shown in fig. 1 and 2, the power transformer includes an iron core 1, an upper clamping piece 2 for clamping the upper end of the iron core 1, a lower clamping piece 3 for clamping the lower end of the iron core 1, a transformer coil 4 surrounding the iron core 1, an upper insulating cushion block 5 mounted on the top of the transformer coil 4, a lower insulating cushion block 6 mounted on the bottom of the transformer coil 4, a base 7 mounted on the bottom of the lower clamping piece 3, a cooling fan 8 mounted on the side surface of the lower clamping piece 3, and an outlet copper bar 9 mounted on the side surface of the upper clamping piece 2; the transformer coil 4 comprises a low-voltage winding and a high-voltage winding surrounding the low-voltage winding, and pouring material layers are wrapped outside the low-voltage winding and the high-voltage winding; the noise reduction and heat dissipation layer is wrapped outside the iron core 1; the noise reduction and heat dissipation layer comprises four layers from inside to outside, namely a particle noise reduction layer 10, a first silica gel cloth layer 11, a silica gel buffer layer 12 and a second silica gel cloth layer 13 in sequence; the particle noise reduction layer 10 is formed by uniformly mixing and curing bentonite with a particle size of 3000 meshes, aluminum nitride with a particle size of 6000 meshes and Dow Corning SE4420 heat-conducting silica gel according to the weight part ratio of 3:4:6, and the thickness is 0.3 cm; the silica gel buffer layer 12 is Dow Corning SE9184 heat-conducting silica gel, and the thickness is 0.3 cm; the first and second silica gel cloth layers 11 and 13 are both made of silica gel-PadK 10 silica gel.
The casting material layers of the low-voltage winding and the high-voltage winding are prepared by the following method:
A. mixing 7 kg of cocoamine polyoxyethylene ether (AC-1203), 4.6 kg of silicon carbide powder with the average particle size of 50 nm, 11 kg of zirconium nitride powder with the average particle size of 800 nm and 4 kg of magnesium oxide powder with the average particle size of 80 nm, uniformly stirring, adding 15 kg of neodecanoic acid glycidyl ester (E-10P), and performing ultrasonic treatment at 50 ℃ for 40 minutes to obtain a component A;
B. taking 105 kg of phoenix brand E-51 bisphenol A type liquid epoxy resin, 4.5 kg of ethylene glycol methacrylate phosphate and 2.2 kg of ethylene neodecanoate, and stirring and mixing uniformly to obtain a component B;
C. taking 32 kg of methyl tetrahydrophthalic anhydride, 5.6 kg of DMP-30 accelerator, 3.5 kg of tetraethylammonium bromide and 3.2 kg of diphenylthiourea, and stirring and mixing uniformly to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
Example 2: the structure is the same as that of the embodiment 1, except that the casting material layers of the low-voltage winding and the high-voltage winding are manufactured by the following method:
A. taking 6 kg of cocoamine polyoxyethylene ether (AC-1203), 4 kg of silicon carbide powder with the average particle size of 50 nm, 10 kg of zirconium nitride powder with the average particle size of 800 nm and 4 kg of magnesium oxide powder with the average particle size of 80 nm, mixing and stirring uniformly, then adding 14 kg of neodecanoic acid glycidyl ester (E-10P), and carrying out ultrasonic treatment for 40 minutes at 50 ℃ to obtain a component A;
B. taking 100 kg of phoenix brand E-51 bisphenol A type liquid epoxy resin, 4 kg of ethylene glycol methacrylate phosphate and 2 kg of ethylene neodecanoate, and uniformly stirring and mixing to obtain a component B;
C. taking 31 kg of methyl tetrahydrophthalic anhydride, 5 kg of DMP-30 accelerator, 3 kg of tetraethylammonium bromide and 3 kg of diphenylthiourea, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
Example 3: the structure is the same as that of the embodiment 1, except that the casting material layers of the low-voltage winding and the high-voltage winding are manufactured by the following method:
A. mixing 8 kg of cocoamine polyoxyethylene ether (AC-1203), 5 kg of silicon carbide powder with the average particle size of 50 nm, 12 kg of zirconium nitride powder with the average particle size of 800 nm and 5 kg of magnesium oxide powder with the average particle size of 80 nm, uniformly stirring, adding 16 kg of neodecanoic acid glycidyl ester (E-10P), and performing ultrasonic treatment at 50 ℃ for 40 minutes to obtain a component A;
B. taking 110 kg of phoenix brand E-51 bisphenol A type liquid epoxy resin, 5 kg of ethylene glycol methacrylate phosphate and 2.5 kg of vinyl neodecanoate, and uniformly stirring and mixing to obtain a component B;
C. taking 35 kg of methyl tetrahydrophthalic anhydride, 6 kg of DMP-30 accelerator, 4 kg of tetraethylammonium bromide and 4 kg of diphenylthiourea, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
Relevant experiments of a pouring material layer of a transformer coil: the experiment is divided into five groups, namely an experiment group 1 and an embodiment 1 of the invention; experiment group 2, in example 1 of the present invention, silicon carbide powder having an average particle size of 50 nm and zirconium nitride powder having an average particle size of 800 nm were replaced with magnesium oxide powder having an average particle size of 80 nm; experiment group 3, in example 1 of the present invention, silicon carbide powder having an average particle size of 50 nm and magnesium oxide powder having an average particle size of 80 nm were replaced with zirconium nitride powder having an average particle size of 800 nm; experiment group 4, in example 1 of the present invention, zirconium nitride powder having an average particle size of 800 nm and magnesium oxide powder having an average particle size of 80 nm were replaced with silicon carbide powder having an average particle size of 50 nm; in the control group, the silicon carbide powder having an average particle size of 50 nm, the zirconium nitride powder having an average particle size of 800 nm, and the magnesium oxide powder having an average particle size of 80 nm in example 1 of the present invention were removed.
Testing the tool: thermal conductivity: the test is carried out by adopting a C-600-S type thermal conductivity tester manufactured by American IN-TERNAT10 NACATTHERMACINSTRUMENT company, and the size of a sample is 149mm multiplied by 5 mm; thermal stability: the thermal weight loss analysis instrument is used for testing by a PhyisTGA 6 model manufactured by Perkin-Elmer company in the United states; the weight loss rate of air at 200 ℃ for 250h is measured, and the initial thermal decomposition temperature is measured. Impact strength: a JJ-5 type simply supported beam type impact tester produced by an X mechanical industry electrical material product quality supervision and detection center is used for testing according to GB/T16420-1996. The results of different groups of test data are shown in table 1, and the table 1 shows that the thermal conductivity of the experimental group 1 is obviously higher than that of other groups, and the experimental group has good thermal aging and mechanical properties.
TABLE 1 statistical table of test numbers of different groups
| Index (I) | |
|
|
|
Control group |
| Thermal conductivity (W/(m.K)) | 1.639 | 0.805 | 0.855 | 1.036 | 0227 |
| Thermal weight loss (%) | 12.19 | 13.89 | 13.87 | 13.19 | 14.67 |
| Initial thermal decomposition temperature (. degree. C.) | 417.1 | 411.8 | 412.1 | 413.9 | 410.2 |
| Impact strength (kJ/m2) | 16.89 | 12.56 | 13.11 | 14.34 | 11.95 |
And (3) noise testing: according to the national standard GB7328-87, the test method is as follows: when the transformer is operated under the specified conditions, the sound level of the transformer is measured by a 2203 type precision sound level meter at a distance of 1m from the transformer. The SCB11-500KVA dry type transformer of Hua-transform power transmission and distribution equipment Limited is taken as a comparison group, an experimental group 1 adopts the embodiment 1 of the invention and is formed by modifying an SCB11-500KVA dry type transformer, an experimental group 2 is an SCB11-500KVA dry type transformer, an iron core is wrapped by 0.6 cm-thick Dow Corning SE9184 heat-conducting silica gel, and the outermost layer is wrapped by American Begges Sil-PadK10 silicon rubberized fabric. It can be seen from table 2 that the noise was significantly reduced by using the experimental group 1 of the present invention.
TABLE 2 different groups of noise tests
| Group of | |
|
Control group |
| Noise (dB) | 49.8 | 52.8 | 53.3 |
Claims (8)
1. A preparation method of a castable layer is characterized by comprising the following steps: the casting material layer is prepared from the following components in parts by weight: 100-110 parts of E-51 epoxy resin, 4-5 parts of ethylene glycol methacrylate phosphate, 2-2.5 parts of vinyl neodecanoate, 31-35 parts of methyl tetrahydrophthalic anhydride, 5-6 parts of DMP-30 accelerator, 3-4 parts of tetraethylammonium bromide, 3-4 parts of diphenylthiourea, 14-16 parts of glycidyl neodecanoate, 6-8 parts of cocoamine polyoxyethylene ether, 4-5 parts of silicon carbide powder with the average particle size of 50 nanometers, 10-12 parts of zirconium nitride powder with the average particle size of 800 nanometers and 4-5 parts of magnesium oxide powder with the average particle size of 80 nanometers;
the preparation method of the castable layer comprises the following steps:
A. taking 6-8 parts by weight of cocoamine polyoxyethylene ether, 4-5 parts by weight of silicon carbide powder with the average particle size of 50 nanometers, 10-12 parts by weight of zirconium nitride powder with the average particle size of 800 nanometers and 4-5 parts by weight of magnesium oxide powder with the average particle size of 80 nanometers, mixing and stirring uniformly, then adding 14-16 parts by weight of glycidyl neodecanoate, and carrying out ultrasonic treatment at 50 ℃ for 40 minutes to obtain a component A;
B. taking 100-110 parts of E-51 epoxy resin, 4-5 parts of ethylene glycol methacrylate phosphate and 2-2.5 parts of vinyl neodecanoate according to parts by weight, and uniformly stirring and mixing to obtain a component B;
C. taking 31-35 parts by weight of methyl tetrahydrophthalic anhydride, 5-6 parts by weight of DMP-30 accelerator, 3-4 parts by weight of tetraethylammonium bromide and 3-4 parts by weight of diphenylthiourea, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
2. The method for preparing a castable layer according to claim 1, wherein: the preparation method comprises the following steps:
A. taking 7 parts by weight of cocoamine polyoxyethylene ether, 4.6 parts by weight of silicon carbide powder with the average particle size of 50 nanometers, 11 parts by weight of zirconium nitride powder with the average particle size of 800 nanometers and 4 parts by weight of magnesium oxide powder with the average particle size of 80 nanometers, mixing and stirring uniformly, then adding 15 parts by weight of neodecanoic acid glycidyl ester, and carrying out ultrasonic treatment at 50 ℃ for 40 minutes to obtain a component A;
B. taking 105 parts of E-51 epoxy resin, 4.5 parts of ethylene glycol methacrylate phosphate and 2.2 parts of vinyl neodecanoate according to the parts by weight, and uniformly stirring and mixing to obtain a component B;
C. taking 32 parts of methyl tetrahydrophthalic anhydride, 5.6 parts of DMP-30 accelerator, 3.5 parts of tetraethylammonium bromide and 3.2 parts of diphenylthiourea according to parts by weight, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
3. The method for preparing the castable layer according to claim 1, characterized in that the preparation method comprises the steps of:
A. taking 6 kg of cocoamine polyoxyethylene ether, 4 kg of silicon carbide powder with the average particle size of 50 nm, 10 kg of zirconium nitride powder with the average particle size of 800 nm and 4 kg of magnesium oxide powder with the average particle size of 80 nm according to parts by weight, mixing and stirring uniformly, then adding 14 kg of neodecanoic acid glycidyl ester, and performing ultrasonic treatment for 40 minutes at 50 ℃ to obtain a component A;
B. taking 100 kg of E-51 epoxy resin, 4 kg of ethylene glycol methacrylate phosphate and 2 kg of vinyl neodecanoate according to the parts by weight, and uniformly stirring and mixing to obtain a component B;
C. taking 31 kg of methyl tetrahydrophthalic anhydride, 5 kg of DMP-30 accelerator, 3 kg of tetraethylammonium bromide and 3 kg of diphenylthiourea according to the weight parts, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
4. The method for preparing the castable layer according to claim 1, characterized in that the preparation method comprises the steps of:
A. taking 8 kg of cocoamine polyoxyethylene ether, 5 kg of silicon carbide powder with the average particle size of 50 nm, 12 kg of zirconium nitride powder with the average particle size of 800 nm and 5 kg of magnesium oxide powder with the average particle size of 80 nm according to parts by weight, mixing and stirring uniformly, then adding 16 kg of neodecanoic acid glycidyl ester, and performing ultrasonic treatment for 40 minutes at 50 ℃ to obtain a component A;
B. taking 110 kg of E-51 epoxy resin, 5 kg of ethylene glycol methacrylate phosphate and 2.5 kg of vinyl neodecanoate according to the parts by weight, and uniformly stirring and mixing to obtain a component B;
C. taking 35 kg of methyl tetrahydrophthalic anhydride, 6 kg of DMP-30 accelerator, 4 kg of tetraethylammonium bromide and 4 kg of diphenylthiourea according to the weight parts, and uniformly stirring and mixing to obtain a component C;
D. mixing the component B and the component C, adding the component A, uniformly stirring, pouring into a casting mold of a winding, then placing the casting mold into an epoxy resin vacuum casting machine, curing for 1h at 89 ℃, and curing for 4h at 122 ℃; curing for 2h at 139 ℃, cooling and then removing the casting mold to obtain the product.
5. A transformer having a castable layer prepared by the method for preparing a castable layer according to claim 1, characterized in that: the transformer coil comprises a low-voltage winding and a high-voltage winding surrounding the low-voltage winding, and pouring material layers are wrapped outside the low-voltage winding and the high-voltage winding.
6. The transformer of claim 5, wherein: the noise reduction and heat dissipation layer is wrapped outside the iron core; the noise-reducing heat dissipation layer comprises four layers from inside to outside, and the four layers are a particle noise-reducing layer, a first silica gel cloth layer, a silica gel buffer layer and a second silica gel cloth layer in sequence.
7. The transformer of claim 6, wherein: the particle noise reduction layer is composed of bentonite with a particle size of 3000 meshes, aluminum nitride with a particle size of 6000 meshes and heat conduction silica gel according to a weight ratio of 3:4: 6; the silica gel buffer layer is a buffer layer formed by heat-conducting silica gel.
8. The transformer of claim 5, wherein: the transformer also comprises an upper clamping piece for clamping the upper end of the iron core and a lower clamping piece for clamping the lower end of the iron core, wherein the bottom of the lower clamping piece is provided with a base, the side surface of the lower clamping piece is provided with a cooling fan, and the side surface of the upper clamping piece is provided with an outlet copper bar; the transformer coil is characterized in that an upper insulating cushion block is installed at the top of the transformer coil, and a lower insulating cushion block is installed at the bottom of the transformer coil.
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| KR20220011112A (en) * | 2019-05-20 | 2022-01-27 | 미츠비시 가스 가가쿠 가부시키가이샤 | A resin composition, a prepreg, a resin sheet provided with a support, a metal foil-clad laminate, and a printed wiring board |
| CN113724964B (en) * | 2021-07-21 | 2023-11-03 | 华为数字能源技术有限公司 | Transformer and insulating packaging method thereof |
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| CN101712545A (en) * | 2009-10-29 | 2010-05-26 | 深圳广田装饰集团股份有限公司 | Interior wall plastering mortar and construction method thereof |
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