CN115497665A - Insulating material for train cable terminal - Google Patents

Insulating material for train cable terminal Download PDF

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Publication number
CN115497665A
CN115497665A CN202211377174.0A CN202211377174A CN115497665A CN 115497665 A CN115497665 A CN 115497665A CN 202211377174 A CN202211377174 A CN 202211377174A CN 115497665 A CN115497665 A CN 115497665A
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CN
China
Prior art keywords
insulating layer
cable terminal
silicon rubber
zno
train
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Application number
CN202211377174.0A
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Chinese (zh)
Inventor
马道平
马芸
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Jiangsu Shilin Electrical Equipment Co Ltd
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Jiangsu Shilin Electrical Equipment Co Ltd
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Priority to CN202211377174.0A priority Critical patent/CN115497665A/en
Publication of CN115497665A publication Critical patent/CN115497665A/en
Pending legal-status Critical Current

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    • 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
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/60—Composite insulating bodies
    • 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
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses an insulating material for a train cable terminal, which comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulation layer is an outer insulation layer of a cable terminal, and the nonlinear composite silicon rubber is prepared by mixing ZnO voltage-sensitive ceramic particles and silicon rubber. The crosslinked polyethylene is obtained by irradiation modification of polyethylene, so that the heat resistance and mechanical property are greatly improved, the contractibility is reduced, the polyethylene is not melted after being heated, and the excellent electrical property is kept; and ZnO and silicon rubber are mixed, so that the method is different from a common insulating material, the phenomenon of uneven electric field is improved, the loss of a medium can be effectively reduced, the running safety of the train set is improved, and the service life of the train is prolonged.

Description

Insulating material for train cable terminal
Technical Field
The invention relates to the field of preparation of insulating materials, in particular to an insulating material for a train cable terminal.
Background
The train set has complex running environment, and the insulating material of the high-voltage cable terminal on the roof is an important factor influencing the safety and the stability of a power supply system of the train set under the influence of multiple factors such as electricity, heat, high-speed airflow and the like. The cable terminal at the top of the train unit works under intermittent and impact loads, the cold and the hot are alternated frequently, defects are easy to remain in the manufacturing process, and the defects are easy to cause the cable terminal to be out of order due to the accelerated development of the remaining defects under the heat of an electric field. And along with the increase of the operation time of the cable, the inner insulation is punctured due to the generation of an air gap of an interface inside the cable terminal, and after the outer insulation of the cable terminal is reduced, the outer insulation can be flashover firstly, so that the puncture probability of the inner insulation is indirectly reduced.
The higher the system voltage level, the more significant the insulation problem. The distribution of electric fields born by the insulating part of the train cable terminal is often extremely uneven, and the electric field intensity born by the insulating part is far beyond the average value of the whole electric field intensity, so that the safety and the reliability of long-term operation of a train are threatened.
Disclosure of Invention
In order to solve the problem of uneven electric field distribution borne by an insulating part of a train cable terminal and improve the safety of a train in long-term operation, an insulating material for the train terminal and a preparation method thereof are provided, and the specific scheme is as follows:
an insulating material for a train cable terminal, which comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer;
the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal;
the crosslinked polyethylene insulating layer is used as the internal insulating layer of the cable terminal, and based on the crosslinked polyethylene insulating cable, the insulating polyethylene molecules of the cable are changed into a main body reticular molecular structure from a linear molecular structure, namely thermoplastic polyethylene is changed into thermosetting crosslinked polyethylene, so that the heat resistance and the mechanical property of the cable are greatly improved, the contractility is reduced, the cable is not melted any more after being heated, and the excellent electrical property is kept.
The nonlinear composite silicon rubber insulating layer is an external insulating layer of a cable terminal, and is prepared by mixing ZnO voltage-sensitive ceramic particles and silicon rubber;
the ZnO pressure sensitive ceramic consists of the following components in percentage by mole:
(80～95)ZnO 2 :(0.5～1.5)BiO 3 :(0.5～1)MnO 2 :(0.5～1)Co 2 O 3 :(0.5～1.5)Sb 2 O 3 ：(2～6)SiO 2 :(0.1～0.5)Al 2 O 3 :(0.2～0.9)Cr 2 O 3 :(0.2～0.55)Ga 2 O 3 :(0.05～0.35)B 2 O 3 :(0.01～0.05)La 2 O 3 。
further, the preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
s1: preparing materials according to the molar ratio of each component of ZnO;
s2: sieving the mixed material according to the preset particle size after the material mixing is finished;
s3: calcining the sieved powder, and cooling to room temperature after the calcination is finished;
s4: and (3) mixing the ZnO prepared in the step (S3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
Further, the crosslinked polyethylene is obtained by irradiating polyethylene, and the irradiation amount is 20-50 Mard.
Further, the temperature required for calcination in S3 is 80 to 120 ℃.
Further, the irradiation is performed using any one of gamma rays, alpha rays, or electron rays.
Furthermore, the molecular weight of the silicon rubber is 60-70 ten thousand.
Has the beneficial effects that:
(1) The invention provides an insulating material for a train cable terminal, which comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer, wherein the crosslinked polyethylene is obtained by irradiating and modifying polyethylene, so that thermoplastic polyethylene is converted into thermosetting crosslinked polyethylene, the heat resistance and the mechanical property of the crosslinked polyethylene are greatly improved, the contractility is reduced, the crosslinked polyethylene is not melted after being heated, and the excellent electrical property is kept; and ZnO and silicon rubber are mixed, so that the method is different from a common insulating material, and by adding the ZnO, the unevenness of an electric field is improved, the loss of a medium can be effectively reduced, the running safety of a train set is improved, and the service life of a train is prolonged.
(2) The invention provides an insulating material for a train cable terminal, which is prepared by optimizing the components of ZnO voltage-sensitive ceramic, wherein the optimized components are as follows: (80-95) ZnO 2 :(0.5～1.5)BiO 3 :(0.5～1)MnO 2 :(0.5～1)Co 2 O 3 :(0.5～1.5)Sb 2 O 3 ：(2～6)SiO 2 :(0.1～0.5)Al 2 O 3 :(0.2～0.9)Cr 2 O 3 :(0.2～0.55)Ga 2 O 3 :(0.05～0.35)B 2 O 3 :(0.01～0.05)La 2 O 3 (ii) a Adding Ga on the basis of the existing components of the traditional pressure sensitive ceramics 2 O 3 、B 2 O 3 、La 2 O 3 And the molar fraction ratio of the components is optimized, so that the nonlinearity of the final silicon rubber mixture is further improved, and the safety is greatly improved.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
The first embodiment is as follows:
an insulating material for a train cable terminal comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal.
A: the preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
(1) The materials are prepared according to the following ZnO ceramic formula:
component (A) ZnO 2 BiO 3 MnO 2 Co 2 O 3 Sb 2 O 3 SiO 2 Al 2 O 3 Cr 2 O 3 Ga 2 O 3 B 2 O 3 La 2 O 3
Mole fraction% of 94.4 0.5 0.5 0.5 0.5 3 0.1 0.2 0.2 0.05 0.05
(2) Sieving the mixed material according to the preset particle size after the material mixing is finished;
(3) Calcining the sieved powder at 100 ℃, and cooling to room temperature after the calcination is finished;
(4) And (4) mixing the ZnO prepared in the step (3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
B: the preparation method of the crosslinked polyethylene comprises the following steps:
(1) Blending an antioxidant 1010, an antioxidant 108, a crosslinking agent, a flame retardant, polyethylene and an ethylene-vinyl acetate copolymer to prepare polyethylene;
(2) Irradiating the polyethylene prepared in the step (1) by using gamma rays, wherein the irradiation dose is 40Mard.
Example two:
an insulating material for a train cable terminal comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal.
The preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
(1) The materials are prepared according to the following ZnO ceramic formula:
component (A) ZnO 2 BiO 3 MnO 2 Co 2 O 3 Sb 2 O 3 SiO 2 Al 2 O 3 Cr 2 O 3 Ga 2 O 3 B 2 O 3 La 2 O 3
Mole fraction% 88.4 1.2 0.8 0.8 1.2 6 0.3 0.5 0.5 0.3 0.03
(2) Sieving the mixed material according to the preset particle size after the batching is finished;
(3) Calcining the sieved powder at 100 ℃, and cooling to room temperature after the calcination is finished;
(4) And (4) mixing the ZnO prepared in the step (3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
B: the preparation method of the crosslinked polyethylene comprises the following steps:
(1) Blending an antioxidant 1010, an antioxidant 108, a crosslinking agent, a flame retardant, polyethylene and an ethylene-vinyl acetate copolymer to prepare polyethylene;
(2) Irradiating the polyethylene prepared in the step (1) by using gamma rays, wherein the irradiation dose is 40Mard.
Example three:
an insulating material for a train cable terminal comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal.
The preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
(1) The materials are prepared according to the following ZnO ceramic formula:
component (A) ZnO 2 BiO 3 MnO 2 Co 2 O 3 Sb 2 O 3 SiO 2 Al 2 O 3 Cr 2 O 3 Ga 2 O 3 B 2 O 3 La 2 O 3
Mole fraction% 88.65 1.5 1 0.8 1.2 5.5 0.3 0.3 0.35 0.35 0.05
(2) Sieving the mixed material according to the preset particle size after the material mixing is finished;
(3) Calcining the sieved powder at 100 ℃, and cooling to room temperature after the calcination is finished;
(4) And (4) mixing the ZnO prepared in the step (3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
B: the preparation method of the crosslinked polyethylene comprises the following steps:
(1) Blending an antioxidant 1010, an antioxidant 108, a cross-linking agent, a flame retardant, polyethylene and an ethylene-vinyl acetate copolymer to prepare polyethylene;
(2) Irradiating the polyethylene prepared in the step (1) by using gamma rays, wherein the irradiation dose is 40Mard.
Example four:
an insulating material for a train cable terminal comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal.
The preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
(1) The materials are prepared according to the following ZnO ceramic formula:
component (A) ZnO 2 BiO 3 MnO 2 Co 2 O 3 Sb 2 O 3 SiO 2 Al 2 O 3 Cr 2 O 3 Ga 2 O 3 B 2 O 3 La 2 O 3
Mole fraction% 88.93 1.25 0.8 0.75 0.95 5.5 0.35 0.75 0.45 0.25 0.02
(2) Sieving the mixed material according to the preset particle size after the material mixing is finished;
(3) Calcining the sieved powder at 100 ℃, and cooling to room temperature after the calcination is finished;
(4) And (4) mixing the ZnO prepared in the step (3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
B: the preparation method of the crosslinked polyethylene comprises the following steps:
(1) Blending an antioxidant 1010, an antioxidant 108, a cross-linking agent, a flame retardant, polyethylene and an ethylene-vinyl acetate copolymer to prepare polyethylene;
(2) Irradiating the polyethylene prepared in the step (1) by using gamma rays, wherein the irradiation dose is 40Mard.
Example five:
an insulating material for a train cable terminal comprises a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer; the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal; the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal.
The preparation method of the nonlinear composite silicon rubber insulating layer comprises the following steps:
(1) The materials are prepared according to the following ZnO ceramic formula:
composition (A) ZnO 2 BiO 3 MnO 2 Co 2 O 3 Sb 2 O 3 SiO 2 Al 2 O 3 Cr 2 O 3 Ga 2 O 3 B 2 O 3 La 2 O 3
Mole fraction% 91.67 0.5 0.6 0.65 1.25 3.5 0.35 0.75 0.45 0.25 0.03
(2) Sieving the mixed material according to the preset particle size after the material mixing is finished;
(3) Calcining the sieved powder at 100 ℃, and cooling to room temperature after the calcination is finished;
(4) And (4) mixing the ZnO prepared in the step (3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
B: the preparation method of the crosslinked polyethylene comprises the following steps:
(1) Blending an antioxidant 1010, an antioxidant 108, a crosslinking agent, a flame retardant, polyethylene and an ethylene-vinyl acetate copolymer to prepare polyethylene;
(2) Irradiating the polyethylene prepared in the step (1) by using gamma rays, wherein the irradiation dose is 40Mard.
As a further improvement, the above-mentioned is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The insulating material for the train cable terminal is characterized by comprising a crosslinked polyethylene insulating layer and a nonlinear composite silicon rubber insulating layer;
the crosslinked polyethylene insulating layer is an internal insulating layer of the cable terminal;
the nonlinear composite silicon rubber insulating layer is an external insulating layer of the cable terminal, and is prepared by mixing ZnO voltage-sensitive ceramic particles and silicon rubber;
the ZnO pressure-sensitive ceramic consists of the following components in mole fraction ratio:
(80～95)ZnO 2 :(0.5～1.5)BiO 3 :(0.5～1)MnO 2 :(0.5～1)Co 2 O 3 :(0.5～1.5)Sb 2 O 3 ：(2～6)SiO 2 :(0.1～0.5)Al 2 O 3 :(0.2～0.9)Cr 2 O 3 :(0.2～0.55)Ga 2 O 3 :(0.05～0.35)B 2 O 3 :(0.01～0.05)La 2 O 3 。
2. the insulation material for a train cable terminal according to claim 1, wherein the preparation method of the nonlinear composite silicone rubber insulation layer comprises the following steps:
s1: preparing materials according to the molar ratio of each component of ZnO;
s2: sieving the mixed material according to the preset particle size after the batching is finished;
s3: calcining the sieved powder, and cooling to room temperature after the calcination is finished;
s4: and (3) mixing the ZnO prepared in the step (S3) with the silicone rubber, and mixing and drying to obtain the nonlinear composite silicone rubber.
3. The insulation material for a train cable terminal according to claim 1, wherein the cross-linked polyethylene is obtained by irradiating polyethylene, and the irradiation amount is 20 to 50Mard.
4. The insulation for a train cable terminal as claimed in claim 2, wherein the temperature required for the calcination in S3 is 80 to 120 ℃.
5. An insulating material for a train cable terminal as claimed in claim 3, wherein the irradiation is performed using any one of gamma rays, alpha rays or electron rays.
6. The insulation material for a train cable terminal according to claim 1, wherein the molecular weight of the silicone rubber is 60 to 70 ten thousand.
CN202211377174.0A 2022-11-04 2022-11-04 Insulating material for train cable terminal Pending CN115497665A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211377174.0A CN115497665A (en) 2022-11-04 2022-11-04 Insulating material for train cable terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211377174.0A CN115497665A (en) 2022-11-04 2022-11-04 Insulating material for train cable terminal

Publications (1)

Publication Number Publication Date
CN115497665A true CN115497665A (en) 2022-12-20

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ID=85115471

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN115497665A (en)

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