CN112963042A - Novel composite insulating cross arm for power transmission line and manufacturing process thereof - Google Patents
Novel composite insulating cross arm for power transmission line and manufacturing process thereof Download PDFInfo
- Publication number
- CN112963042A CN112963042A CN202110359427.0A CN202110359427A CN112963042A CN 112963042 A CN112963042 A CN 112963042A CN 202110359427 A CN202110359427 A CN 202110359427A CN 112963042 A CN112963042 A CN 112963042A
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- fiber core
- basalt fiber
- cross arm
- pipe
- insulating
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- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 230000005540 biological transmission Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 79
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 239000003822 epoxy resin Substances 0.000 claims description 22
- 229920000647 polyepoxide Polymers 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 17
- 239000011324 bead Substances 0.000 claims description 13
- 229920002379 silicone rubber Polymers 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- 238000005470 impregnation Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- MWSKJDNQKGCKPA-UHFFFAOYSA-N 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1CC(C)=CC2C(=O)OC(=O)C12 MWSKJDNQKGCKPA-UHFFFAOYSA-N 0.000 claims description 7
- AHDSRXYHVZECER-UHFFFAOYSA-N 2,4,6-tris[(dimethylamino)methyl]phenol Chemical compound CN(C)CC1=CC(CN(C)C)=C(O)C(CN(C)C)=C1 AHDSRXYHVZECER-UHFFFAOYSA-N 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000004005 microsphere Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000006082 mold release agent Substances 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 239000003365 glass fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 244000080575 Oxalis tetraphylla Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009755 vacuum infusion Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
-
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
-
- 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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/05—Suspension arrangements or devices for electric cables or lines
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Insulating Bodies (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a novel composite insulating cross arm for a transmission line and a manufacturing process thereof, wherein the novel composite insulating cross arm comprises a basalt fiber core body pipe, an inner filling body filled in the basalt fiber core body pipe, and an insulating outer sleeve wrapped outside the basalt fiber core body pipe; and a wire fitting is installed at one end of the basalt fiber core tube, and a connecting fitting for fixedly connecting the composite insulating cross arm body and the power transmission and transformation equipment component is arranged at the other end of the basalt fiber core tube. On the premise of meeting the insulation performance of the cross arm main body, the composite insulation cross arm greatly reduces the sectional area of the cross arm, and further reduces the total weight of the composite insulation cross arm; the composite insulating cross arm has the effects of strong weather resistance and stable insulating property; simultaneously because the compound insulating cross arm in this application satisfies transmission of electricity mechanical strength, the lightweight design of being convenient for further dwindles transmission of electricity corridor's width to reduce the influence of wind pendulum effect.
Description
Technical Field
The invention relates to the technical field of power transmission line matched components, in particular to a novel composite insulating cross arm for a power transmission line and a manufacturing process thereof.
Background
In the field of electric power facilities, a composite insulating cross arm for a transmission line is an important matched structural member, wherein one end of the composite insulating cross arm is connected with a transmission tower through fixing equipment such as hardware fittings and the like, and the other end of the composite insulating cross arm is connected with a transmission lead; the silicon rubber umbrella skirt on the insulating cross arm is used for increasing the creepage distance and improving the insulating level of the composite insulating cross arm. The conventional cross arm comprises a wooden cross arm, a steel cross arm, a solid composite insulating cross arm and a filling type composite insulating cross arm. The wooden or iron cross arm is widely applied, but the problems of poor weather resistance, reduced insulation level, wide power transmission corridor, large influence of wind swing and the like can occur in the long-term operation process. The solid composite insulating cross arm is made of a glass fiber/epoxy resin composite core rod, has certain weather resistance and specific strength, but has larger weight compared with the filled composite insulating cross arm. The filled composite insulating cross arm is made of a glass fiber/epoxy resin composite material core tube, has the advantages of light weight, but has poor weather resistance, general mechanical strength and low specific strength, so that the size of the filled composite insulating cross arm is larger under the condition of meeting the line strength.
Disclosure of Invention
The invention aims to provide a novel composite insulating cross arm for a transmission line and a manufacturing process thereof, which solve the problems of the conventional insulating cross arm.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a novel composite insulating cross arm for a transmission line and a manufacturing process thereof, wherein the novel composite insulating cross arm comprises a basalt fiber core body pipe, an inner filling body filled in the basalt fiber core body pipe, and an insulating outer sleeve wrapped outside the basalt fiber core body pipe; one end of the basalt fiber core pipe is provided with a wire hardware fitting, and the other end of the basalt fiber core pipe is provided with a connecting hardware fitting for fixedly connecting the composite insulating cross arm body and the power transmission and transformation equipment component;
the basalt fiber core pipe is manufactured by pultrusion of basalt fibers through a pultrusion machine; the inner filling body is arranged in the basalt fiber core tube in a vacuum filling mode.
Furthermore, the basalt fiber core pipe is of a square pipe structure, the wall thickness of the basalt fiber core pipe is 8mm-10mm, the width of an outer frame of the basalt fiber core pipe is not less than 42mm, and the height of the outer frame of the basalt fiber core pipe is not less than 54 mm.
Still further, the inner filler comprises epoxy resin and glass microspheres, wherein the content of the glass microspheres is 1% -25% of the content of the epoxy resin.
Furthermore, the insulating outer sleeve is arranged on the outer wall of the basalt fiber core pipe through an injection process, so that the integral structure ensures that the inner insulation is not affected with damp and the creepage distance of the insulator is increased.
Furthermore, the insulating coat is of an umbrella skirt structure and is made of high-temperature vulcanized silicone rubber.
A manufacturing process of a novel composite insulating cross arm for a transmission line,
step i, preparing a steeping fluid;
injecting a mixed solution of E51 epoxy resin, curing agent methyl tetrahydrophthalic anhydride, accelerator DMP-30, internal mold release agent and pigment into the impregnation tank;
step ii, processing the composite insulating core tube;
introducing basalt fibers into an impregnation tank from a creel for impregnation, then conveying the basalt fibers into a core tube mold, and performing pultrusion and segmented cutting by a tractor and a cutting machine to finally prepare a basalt fiber core tube;
step iii, filling the basalt fiber core pipe;
the preparation method comprises the following steps of (1) carrying out surface treatment on glass beads through a KH550 coupling agent solution to reduce interface defects of the glass beads, uniformly mixing E41 epoxy resin with glass beads accounting for 15% of E41 epoxy resin, mixing with methyl tetrahydrophthalic anhydride and an accelerant DMP-30, and finally filling the mixture into the basalt fiber core tube in the step ii in a vacuum injection mode;
step iv, mounting a connecting hardware fitting;
after the solidification of the inner filler in the step iii is finished, placing the basalt fiber core body pipe in a trench of a hardware crimping machine, and respectively installing a wire hardware fitting and a connecting hardware fitting at two ends of the basalt fiber core body pipe through the hardware crimping machine;
step v, manufacturing an insulating outer sleeve;
cleaning the outer surface of the basalt fiber core tube, performing interface treatment, placing the basalt fiber core tube in silicon rubber injection equipment, and injecting high-temperature vulcanized silicon rubber into a mold to form an insulating outer sleeve so as to wrap the basalt fiber core tube.
Compared with the prior art, the invention has the beneficial technical effects that: on the premise of meeting the insulation performance of the cross arm main body, the composite insulation cross arm greatly reduces the sectional area of the cross arm, and further reduces the total weight of the composite insulation cross arm; the composite insulating cross arm has the effects of strong weather resistance and stable insulating property; simultaneously because the compound insulating cross arm in this application satisfies transmission of electricity mechanical strength, the lightweight design of being convenient for further dwindles transmission of electricity corridor's width to reduce the influence of wind pendulum effect.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a schematic main body view of a novel composite insulating cross arm for a power transmission line according to the present invention;
description of reference numerals:
1. an inner filler; 2. a basalt fiber core tube; 3. an insulating outer sleeve; 4. a wire hardware fitting; 5. and connecting the hardware fitting.
Detailed Description
As shown in fig. 1, the present embodiment discloses a novel composite insulating cross arm for a power transmission line, which includes a basalt fiber core pipe 1, an inner filler 2 filled in the basalt fiber core pipe 1, and an insulating outer jacket 3 wrapped outside the basalt fiber core pipe 1; one end of the basalt fiber core tube 1 is provided with a wire hardware fitting 4, and the other end of the basalt fiber core tube is provided with a connecting hardware fitting 5 for fixedly connecting the composite insulating cross arm body and the power transmission and transformation equipment component; compared with the conventional material, the basalt fiber composite material has higher mechanical strength and weather resistance, so that the size of the composite insulating cross arm can be reduced while the line strength is met by adopting the basalt fiber composite material to manufacture the core tube, and the lightweight design of the insulating cross arm is facilitated.
In the embodiment, the basalt fiber core pipe 1 is manufactured by pultrusion of basalt fibers by a pultrusion machine; specifically, the basalt fiber core tube 1 is of a square tube structure, the wall thickness of the basalt fiber core tube is 8mm-10mm, the width of an outer frame of the basalt fiber core tube is not less than 42mm, and the height of the outer frame of the basalt fiber core tube is not less than 54mm, so that the premise that the requirement of line strength can be met is met, materials are saved, and the width of a power transmission corridor is reduced;
the inner filling body 2 is filled in the basalt fiber core pipe 1 in a vacuum infusion mode; the inner filler 2 includes epoxy resin and glass beads, wherein the content of the glass beads is 1% -25% of the content of the epoxy resin, in this embodiment, specifically, the content of the glass beads is 12% of the content of the epoxy resin, and the epoxy resin in this embodiment can be replaced by modified epoxy resin, so that the overall composite insulating cross arm has light weight, and meanwhile, the inside of the composite insulating cross arm has an insulating effect, and the insulating performance is further improved.
In this embodiment, the insulating outer sleeve 3 is disposed on the outer wall of the basalt fiber core tube 1 by an injection process, and the insulating outer sleeve 3 is of an umbrella skirt structure and is made of high-temperature vulcanized silicone rubber, so that the integral structure ensures that the inner insulation is not affected with damp, and the creepage distance of the insulator is increased.
The application discloses manufacturing process of novel composite insulation cross arm for power transmission line, including the following steps:
step i, preparing a steeping fluid;
injecting a mixed solution of E51 epoxy resin, curing agent methyl tetrahydrophthalic anhydride, accelerator DMP-30, internal mold release agent and pigment into the impregnation tank; the impregnating solution is equivalent to glue for sticking the basalt fibers together, the continuous fibers are dragged into a die through the impregnating solution in the process, and a core tube is formed by heating and pressurizing, so that the basalt fiber core tube composite material takes the basalt fibers as a reinforcing material and takes the epoxy resin as a matrix material;
step ii, processing the composite insulating core tube;
introducing basalt fibers into an impregnation tank from a creel for impregnation, then conveying the basalt fibers into a core tube mold, and performing pultrusion and segmented cutting by a tractor and a cutting machine to finally prepare a basalt fiber core tube;
step iii, filling the basalt fiber core pipe;
the preparation method comprises the following steps of performing surface treatment on glass beads through a KH550 coupling agent solution to reduce interface defects of the glass beads, uniformly mixing E41 epoxy resin with glass beads accounting for 15% of E41 epoxy resin, mixing methyl tetrahydrophthalic anhydride and an accelerant DMP-30, wherein the methyl tetrahydrophthalic anhydride has a curing effect on the mixture of the epoxy resin and the glass beads as a filler, and finally filling the mixture into the basalt fiber core tube in the step ii in a vacuum injection mode;
step iv, mounting a connecting hardware fitting;
after the solidification of the inner filler in the step iii is finished, placing the basalt fiber core body pipe in a trench of a hardware crimping machine, and respectively installing a wire hardware fitting and a connecting hardware fitting at two ends of the basalt fiber core body pipe through the hardware crimping machine;
step v, manufacturing an insulating outer sleeve;
cleaning the outer surface of the basalt fiber core tube, performing interface treatment, placing the basalt fiber core tube in silicon rubber injection equipment, and injecting high-temperature vulcanized silicon rubber into a mold to form an insulating outer sleeve so as to wrap the basalt fiber core tube.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The utility model provides a novel compound insulating cross arm that transmission line was used which characterized in that: the basalt fiber core body pipe is filled with an inner filling body and an insulating outer sleeve, wherein the insulating outer sleeve is wrapped outside the basalt fiber core body pipe; one end of the basalt fiber core pipe is provided with a wire hardware fitting, and the other end of the basalt fiber core pipe is provided with a connecting hardware fitting for fixedly connecting the composite insulating cross arm body and the power transmission and transformation equipment component;
the basalt fiber core pipe is manufactured by pultrusion of basalt fibers through a pultrusion machine; the inner filling body is arranged in the basalt fiber core tube in a vacuum filling mode.
2. The novel composite insulating cross arm for the transmission line according to claim 1, characterized in that: the basalt fiber core pipe is of a square pipe structure, the wall thickness of the basalt fiber core pipe is 8mm-10mm, the width of an outer frame of the basalt fiber core pipe is not less than 42mm, and the height of the outer frame of the basalt fiber core pipe is not less than 54 mm.
3. The novel composite insulating cross arm for the transmission line according to claim 1, characterized in that: the inner filler comprises epoxy resin and glass microspheres, wherein the content of the glass microspheres is 1% -25% of the content of the epoxy resin.
4. The novel composite insulating cross arm for the transmission line according to claim 1, characterized in that: the insulating outer sleeve is arranged on the outer wall of the basalt fiber core pipe through an injection process, so that the integral structure ensures that the inner insulation is not affected with damp and the creepage distance of the insulator is increased.
5. The novel composite insulating cross arm for the transmission line according to claim 1, characterized in that: the insulating outer sleeve is of an umbrella skirt structure and is made of silicon rubber subjected to high-temperature vulcanization.
6. A manufacturing process of a novel composite insulating cross arm for a transmission line is characterized by comprising the following steps:
step i, preparing a steeping fluid;
injecting a mixed solution of E51 epoxy resin, curing agent methyl tetrahydrophthalic anhydride, accelerator DMP-30, internal mold release agent and pigment into the impregnation tank;
step ii, processing the composite insulating core tube;
introducing basalt fibers into an impregnation tank from a creel for impregnation, then conveying the basalt fibers into a core tube mold, and performing pultrusion and segmented cutting by a tractor and a cutting machine to finally prepare a basalt fiber core tube;
step iii, filling the basalt fiber core pipe;
the preparation method comprises the following steps of (1) carrying out surface treatment on glass beads through a KH550 coupling agent solution to reduce interface defects of the glass beads, uniformly mixing E41 epoxy resin with glass beads accounting for 15% of E41 epoxy resin, mixing with methyl tetrahydrophthalic anhydride and an accelerant DMP-30, and finally filling the mixture into the basalt fiber core tube in the step ii in a vacuum injection mode;
step iv, mounting a connecting hardware fitting;
after the solidification of the inner filler in the step iii is finished, placing the basalt fiber core body pipe in a trench of a hardware crimping machine, and respectively installing a wire hardware fitting and a connecting hardware fitting at two ends of the basalt fiber core body pipe through the hardware crimping machine;
step v, manufacturing an insulating outer sleeve;
cleaning the outer surface of the basalt fiber core tube, performing interface treatment, placing the basalt fiber core tube in silicon rubber injection equipment, and injecting high-temperature vulcanized silicon rubber into a mold to form an insulating outer sleeve so as to wrap the basalt fiber core tube.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359427.0A CN112963042A (en) | 2021-04-02 | 2021-04-02 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
| CN202111389938.3A CN113958189A (en) | 2021-04-02 | 2021-11-19 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359427.0A CN112963042A (en) | 2021-04-02 | 2021-04-02 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112963042A true CN112963042A (en) | 2021-06-15 |
Family
ID=76281060
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110359427.0A Withdrawn CN112963042A (en) | 2021-04-02 | 2021-04-02 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
| CN202111389938.3A Pending CN113958189A (en) | 2021-04-02 | 2021-11-19 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111389938.3A Pending CN113958189A (en) | 2021-04-02 | 2021-11-19 | Novel composite insulating cross arm for power transmission line and manufacturing process thereof |
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| Country | Link |
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| CN (2) | CN112963042A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113635571A (en) * | 2021-09-08 | 2021-11-12 | 广西电网有限责任公司电力科学研究院 | Basalt fiber reinforced composite insulating cross arm device and preparation method thereof |
| CN114412268A (en) * | 2021-12-31 | 2022-04-29 | 浙江华保电力科技股份有限公司 | Enhancement mode does not have umbrella stereoplasm composite insulation cross arm |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123131A (en) * | 2006-08-11 | 2008-02-13 | 南通市神马电力科技有限公司 | A compound supporting pole insulator with extrusion bar as internal core and its making method |
| CN101832050A (en) * | 2009-11-06 | 2010-09-15 | 常熟风范电力设备股份有限公司 | Composite material pole tower and manufacturing process thereof |
| CN102074323A (en) * | 2009-11-23 | 2011-05-25 | 常熟风范电力设备股份有限公司 | Novel insulating cross arm and manufacturing process thereof |
| CN103280276A (en) * | 2013-05-24 | 2013-09-04 | 国家电网公司 | Composite cross arm and manufacturing process thereof |
| CN106320797B (en) * | 2016-08-25 | 2019-01-25 | 陕西泰普瑞电工技术有限公司 | A kind of high voltage hard full skirt composite insulation cross arm and its preparation facilities and method |
| CN111081434B (en) * | 2019-12-31 | 2022-03-04 | 衡水瑞纤新材料科技有限公司 | Basalt fiber insulator core rod |
-
2021
- 2021-04-02 CN CN202110359427.0A patent/CN112963042A/en not_active Withdrawn
- 2021-11-19 CN CN202111389938.3A patent/CN113958189A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113635571A (en) * | 2021-09-08 | 2021-11-12 | 广西电网有限责任公司电力科学研究院 | Basalt fiber reinforced composite insulating cross arm device and preparation method thereof |
| CN114412268A (en) * | 2021-12-31 | 2022-04-29 | 浙江华保电力科技股份有限公司 | Enhancement mode does not have umbrella stereoplasm composite insulation cross arm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113958189A (en) | 2022-01-21 |
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Application publication date: 20210615 |