CN114188109A - Preparation method and application of magnesium oxide for high-impedance and high-voltage breakdown prevention mineral insulated cable - Google Patents
Preparation method and application of magnesium oxide for high-impedance and high-voltage breakdown prevention mineral insulated cable Download PDFInfo
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- CN114188109A CN114188109A CN202111513566.0A CN202111513566A CN114188109A CN 114188109 A CN114188109 A CN 114188109A CN 202111513566 A CN202111513566 A CN 202111513566A CN 114188109 A CN114188109 A CN 114188109A
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- Prior art keywords
- magnesium oxide
- mineral insulated
- insulated cable
- voltage breakdown
- impedance
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 95
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 60
- 239000011707 mineral Substances 0.000 title claims abstract description 60
- 230000015556 catabolic process Effects 0.000 title claims abstract description 36
- 230000002265 prevention Effects 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 229920002545 silicone oil Polymers 0.000 claims abstract description 22
- 239000013078 crystal Substances 0.000 claims abstract description 21
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000003085 diluting agent Substances 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 20
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- -1 methyl hydrogen Chemical class 0.000 claims description 2
- 229920002050 silicone resin Polymers 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005485 electric heating Methods 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 7
- 238000007873 sieving Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
Abstract
The invention discloses a preparation method and application of magnesium oxide for a high-impedance and high-voltage breakdown prevention mineral insulated cable, wherein the preparation method of the magnesium oxide for the high-impedance and high-voltage breakdown prevention mineral insulated cable comprises the steps of crushing, screening, magnetically separating and drying fused magnesia lump materials to obtain crystal fused magnesia powder; mixing the crystal fused magnesium oxide powder with an organic silicone oil diluent according to the weight ratio of 100: 0.3-0.6 to prepare magnesium oxide for the hydrophobic mineral insulated cable; then the magnesium oxide is evenly stirred with the electric melting aluminum oxide according to the weight ratio of 100: 5-20 to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable. The method disclosed by the invention is based on the magnesium oxide for the mineral insulated cable, utilizes the characteristic of high resistance and high voltage breakdown resistance of the electric melting aluminum oxide, and uniformly mixes the electric melting aluminum oxide and the magnesium oxide for the mineral insulated cable according to a certain weight ratio to prepare the electric melting aluminum oxide, so that the heat transfer effect is obviously improved when the electric heating tube insulating layer filler is used.
Description
Technical Field
The invention relates to the field of magnesium oxide for mineral insulated cables, in particular to a preparation method and application of magnesium oxide for high-impedance and high-voltage breakdown prevention mineral insulated cables.
Background
Magnesium oxide for mineral insulated cables is an important insulating high-temperature-resistant filling material, has excellent high-impedance insulating property and high thermal conductivity, and is widely applied to various mineral insulated cables. When the traditional mineral insulated cable is made of magnesium oxide, the original stirring mode is adopted to mix calcined silicate and add the mixed oxide as an auxiliary agent, so that the electrical insulation performance is improved, and because the electrical impedance of the auxiliary agent is poor and is influenced by high temperature, a serious low-resistance effect can be formed in the MI cable, the electrical breakdown resistance of the cable is seriously reduced in the heating process, great potential safety hazard and energy waste loss are caused.
Disclosure of Invention
The invention provides a preparation method and application of magnesium oxide for a mineral insulated cable with high impedance and high voltage breakdown prevention, and aims to solve the problem of poor electrical impedance insulating capability of magnesium oxide powder for a mineral insulated cable for an MI cable.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of magnesium oxide for a high-impedance and high-voltage breakdown prevention mineral insulated cable comprises the following steps:
s1: crushing, screening, magnetically separating and drying the fused magnesia to obtain crystal fused magnesia powder;
s2: mixing the crystal fused magnesia powder obtained in the step S1 with the organic silicone oil diluent according to the weight ratio of 100: 0.3-0.6 to prepare the magnesia for the hydrophobic mineral insulated cable;
s3: and (4) uniformly stirring the magnesium oxide for the hydrophobic mineral insulated cable obtained in the step (S2) and the electric melting aluminum oxide according to the weight ratio of 100: 5-20 to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Further, in the step S1, the grain size of the fused crystalline magnesium oxide powder is 40 to 325 days.
Further, in the step S1, the drying temperature is 300-500 ℃, and the time is 60-120 min.
Further, in step S2, the silicone oil in the silicone oil diluent is one or more selected from methyl hydrogen silicone oil, dimethyl silicone oil, and silicone resin; the diluent in the organic silicone oil diluent is selected from one or more of dimethylbenzene, solvent oil and gasoline.
Further, in step S2, the dilution ratio of the silicone oil diluent is 100: 0.3-0.9.
Further, in the step S3, the density of the fused alumina is not less than 4.2g/cm3The electrical insulation strength is not less than 3500V/mm · s.
Further, in the step S3, the stirring speed is 50-100r/min, and the time is 15-30 min.
The magnesium oxide for the high-impedance and high-voltage breakdown prevention mineral insulated cable is prepared by the preparation method of the magnesium oxide for the high-impedance and high-voltage breakdown prevention mineral insulated cable.
An application of magnesium oxide for a high-impedance and high-voltage breakdown prevention mineral insulated cable in an MI cable.
The invention discloses a preparation method and application of magnesium oxide for a mineral insulated cable with high impedance and high voltage breakdown prevention. When the method is applied to the preparation of MI cables for testing, the comprehensive electrical impedance insulating capacity is improved by more than 20%, the compressive strength is improved by more than 10%, meanwhile, the high temperature resistance of the MI cables is ensured, the electrical impedance insulating capacity of the MI cables is improved, the service life of the MI cables is prolonged, and the method has a wide application prospect.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
(1) crushing, screening and magnetically separating the fused magnesia lump materials, and drying for 60 minutes at 300 ℃ to prepare 60-mesh crystal fused magnesia powder;
(2) mixing the obtained crystal fused magnesium oxide powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.5, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.2g/cm3The electric melting alumina with the electric insulation strength of more 3500V/mm.s is prepared by the following raw materials in percentage by weight of 100: 5, uniformly mixing, stirring for 15 minutes at a speed of 50r/min, sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Example 2:
(1) crushing, screening and magnetically separating the fused magnesia lump materials, and drying the fused magnesia lump materials for 90 minutes at 300 ℃ to prepare 60-mesh crystal fused magnesia powder;
(2) mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6 for 16 minutes to prepare the magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.25g/cm3Electric melting alumina with electric insulation strength of 3600V/mm & s more comprises the following components in percentage by weight of 100: 8, uniformly mixing, stirring for 18 minutes at the speed of 60r/min, sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Example 3:
(1) crushing, screening and magnetically separating the fused magnesia lump materials, and drying the fused magnesia lump materials at 360 ℃ for 100 minutes to prepare 60-mesh crystal fused magnesia powder;
(2) mixing the obtained crystal fused magnesium oxide powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.3g/cm3Uniformly mixing electric melting aluminum oxide with the electric insulation strength of more than 3800V/mm & s according to the weight ratio of 100: 12, stirring for 16 minutes at 70r/min, sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Example 4
(1) Crushing, screening and magnetically separating the fused magnesia lump materials, and drying for 85 minutes at 380 ℃ to prepare 60-mesh crystal fused magnesia powder;
(2) mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6 for 15 minutes to prepare the magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.35g/cm3Uniformly mixing electric melting aluminum oxide with the electric insulation strength of more than 4000V/mm & s according to the weight ratio of 100: 20, stirring for 16 minutes at the speed of 75r/min, sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Example 5:
(1) crushing, screening and magnetically separating the fused magnesia lump materials, and drying for 120 minutes at 350 ℃ to prepare 60-mesh crystal fused magnesia powder;
(2) mixing the obtained crystal fused magnesium oxide powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.2g/cm3Electric melting alumina with electric insulation strength of 3600V/mm & s more comprises the following components in percentage by weight of 100: 5, uniformly mixing, stirring for 18 minutes at 60r/minAnd (4) sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Example 6:
(1) crushing, screening and magnetically separating the fused magnesia lump materials, and drying for 60 minutes at 320 ℃ to prepare 60-mesh crystal fused magnesia powder;
(2) mixing the obtained crystal fused magnesium oxide powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6, mixing and stirring for 15 minutes to prepare magnesium oxide for the hydrophobic mineral insulated cable;
(3) mixing the obtained magnesium oxide powder for hydrophobic mineral insulated cable with density of 4.2g/cm3Electric melting alumina with electric insulation strength of 3600V/mm & s more comprises the following components in percentage by weight of 100: 16, stirring for 20 minutes at the speed of 60r/min, sieving and packaging to obtain the magnesium oxide for the high-impedance high-voltage breakdown-resistant mineral insulated cable.
Comparative example:
(1) crushing, screening and magnetically separating the fused magnesia lump material to prepare 60-mesh crystal fused magnesia powder;
(2) mixing and stirring the obtained crystal fused magnesia powder and dimethyl organic silicone oil according to the weight ratio of 100: 0.6 for 15 minutes to prepare the magnesium oxide for the hydrophobic mineral insulated cable;
(3) uniformly mixing the obtained magnesium oxide powder for the hydrophobic mineral insulated cable and a silicate additive according to the weight ratio of 100: 5, stirring for 20 minutes at 75r/min, heating and uniformly stirring a dispersing agent, sieving and packaging to obtain the magnesium oxide for the common mineral insulated cable.
The physical properties, the insulating properties, the high-voltage breakdown resistance and the volume surface resistivity of the magnesium oxide powder for the 6 high-impedance high-voltage breakdown prevention mineral insulated cables in the above examples 1 to 6 were tested, wherein the flow rate adopted was a model 2 Ford cup; the density is measured by a tap density instrument according to the standard [ JB/T8508-1996 ]; the high-voltage breakdown resistance adopts the type of a voltage withstanding instrument: an ET2670A model voltage withstand tester; the volume surface resistivity measurement adopts the following model: the LST-121 volume surface resistivity tester has the following specific test results as shown in the following tables 1 to 3:
TABLE 1 physical Property testing
| Numbering | Flow rate/100 g | Density/cubic centimeter |
| Comparative example | 38 seconds | 2.25 g |
| Example 1 | 30 seconds | 2.32 g |
| Example 2 | 28 seconds | 2.30 g |
| Example 3 | 29 seconds | 2.32 g |
| Example 4 | 31 second | 2.31 g |
| Example 5 | 29 seconds | 2.33 g |
| Example 6 | 30 seconds | 2.34 g |
TABLE 2 resistance insulation resistance to high voltage breakdown test
| Numbering | Actually measured V/30 min |
| Comparative example | 2500 |
| Example 1 | 3100 |
| Example 2 | 3200 |
| Example 3 | 3300 |
| Example 4 | 3500 |
| Example 5 | 3400 |
| Example 6 | 3350 |
TABLE 3 volume surface resistivity
As can be seen from tables 1-3, the flow rate and density of the prepared high-resistance high-voltage breakdown-resistant magnesium oxide for the mineral insulated cable are superior to those of the magnesium oxide for the common mineral insulated cable by adding the electric melting aluminum oxide, and the resistance insulation high-voltage breakdown resistance and the volume surface resistivity of the magnesium oxide are superior to those of the magnesium oxide for the common mineral insulated cable; when the high-temperature-resistant high-voltage-resistant medium-voltage (MI) cable is applied to the preparation of MI cables for testing, the comprehensive electrical impedance insulating capability of the MI cable is improved by more than 20%, and the compressive strength of the MI cable is improved by more than 10%.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A preparation method of magnesium oxide for a high-impedance and high-voltage breakdown prevention mineral insulated cable is characterized by comprising the following steps:
s1: crushing, screening, magnetically separating and drying the fused magnesia to obtain crystal fused magnesia powder;
s2: mixing the crystal fused magnesia powder obtained in the step S1 with the organic silicone oil diluent according to the weight ratio of 100: 0.3-0.6 to prepare the magnesia for the hydrophobic mineral insulated cable;
s3: mixing the magnesium oxide for the hydrophobic mineral insulated cable obtained in the step S2 with the electric melting aluminum oxide according to the weight ratio of 100: and 5-20, and uniformly stirring to obtain the magnesium oxide for the high-impedance high-voltage breakdown-prevention mineral insulated cable.
2. The method for preparing the magnesium oxide for the mineral insulated cable with high impedance and high voltage breakdown resistance according to claim 1, wherein in the step S1, the particle size of the crystal electro-fused magnesium oxide powder is 40-325 meshes.
3. The method as claimed in claim 1, wherein the drying temperature is 300-500 ℃ and the drying time is 60-120min in step S1.
4. The method for preparing magnesium oxide for mineral insulated cable with high impedance and high voltage breakdown prevention according to claim 1, wherein in step S2, the silicone oil in the silicone oil diluent is selected from one or more of methyl hydrogen silicone oil, dimethyl silicone oil and silicone resin; the diluent in the organic silicone oil diluent is selected from one or more of dimethylbenzene, solvent oil and gasoline.
5. The method for preparing magnesium oxide for a mineral insulated cable with high impedance and high voltage breakdown prevention according to claim 1, wherein in step S2, the dilution ratio of the silicone oil diluent is 100: 0.3-0.9.
6. The method for preparing the magnesium oxide for the mineral insulated cable with high impedance and high voltage breakdown resistance according to claim 1, wherein in the step S3, the density of the fused alumina is not less than 4.2g/cm3The electrical insulation strength is not less than 3500V/mm · s.
7. The method for preparing magnesium oxide for a mineral insulated cable with high impedance and high voltage breakdown prevention according to claim 1, wherein in the step S3, the stirring speed is 50-100r/min and the time is 15-30 min.
8. The magnesium oxide for the high-impedance and high-voltage breakdown prevention mineral insulated cable is characterized by being prepared by the preparation method of the magnesium oxide for the high-impedance and high-voltage breakdown prevention mineral insulated cable according to any one of claims 1 to 7.
9. Use of magnesium oxide for high impedance high voltage breakdown prevention mineral insulated cables according to claim 8 in MI cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111513566.0A CN114188109B (en) | 2021-12-07 | Preparation method and application of magnesium oxide for high-impedance high-voltage breakdown prevention mineral insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111513566.0A CN114188109B (en) | 2021-12-07 | Preparation method and application of magnesium oxide for high-impedance high-voltage breakdown prevention mineral insulated cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114188109A true CN114188109A (en) | 2022-03-15 |
| CN114188109B CN114188109B (en) | 2024-05-10 |
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|---|---|---|---|---|
| JPH02121202A (en) * | 1988-10-28 | 1990-05-09 | Tateho Chem Ind Co Ltd | Electrically insulating filler and its manufacture |
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