CN205692970U - Graphite bonded earth electrode - Google Patents
Graphite bonded earth electrode Download PDFInfo
- Publication number
- CN205692970U CN205692970U CN201620499533.3U CN201620499533U CN205692970U CN 205692970 U CN205692970 U CN 205692970U CN 201620499533 U CN201620499533 U CN 201620499533U CN 205692970 U CN205692970 U CN 205692970U
- Authority
- CN
- China
- Prior art keywords
- graphite
- layer
- inner core
- composite
- grounding body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 111
- 239000010439 graphite Substances 0.000 title claims abstract description 111
- 239000002131 composite material Substances 0.000 claims abstract description 70
- 229910052751 metal Inorganic materials 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 56
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 238000009954 braiding Methods 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 239000012210 heat-resistant fiber Substances 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000003491 array Methods 0.000 abstract 2
- 239000012530 fluid Substances 0.000 abstract 2
- 239000003550 marker Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 239000004575 stone Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 79
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000003232 water-soluble binding agent Substances 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Resistance Heating (AREA)
- Surface Heating Bodies (AREA)
Abstract
This utility model relates to a kind of graphite bonded earth electrode, including the inner core arranged from inside to outside, intermediate layer and braid；Wherein, described inner core is the heat resistance fiber bundle of single or many heat resistance fiber composition；Described intermediate layer is coated with described inner core, and includes graphite linings alternately and equal fluid layer successively；Described graphite linings is formed along the contour direction close-packed arrays of described inner core by the composite stone line of ink marker；Described equal fluid layer includes double layer of metal sheet, and the metal wire layer between double layer of metal sheet, and described metal wire layer is formed along described inner core contour direction close-packed arrays by tinsel；Described braid is obtained around the outside braiding in described intermediate layer by the described composite stone line of ink marker.This graphite bonded earth electrode, the centrally disposed inner core of single or many heat resistance fiber composition that, utilization ratio minimum by the current density when grounding body works is minimum, in graphite, metal consumption inconvenience, on the premise of reducing cost, can effectively promote the grounding resistance-reducing effect of conductor utilization and grounding body.
Description
Technical Field
The utility model relates to an electric power ground connection technical field especially relates to a graphite composite grounding body.
Background
The electric power grounding system is an important electric power facility for ensuring the safe and reliable operation of electric power equipment and the personal safety of electric power operators. The existing power system grounding grid mostly adopts metal grounding materials such as carbon steel, stainless steel, galvanized steel, copper-clad steel and the like, and is mostly in the shape of a cylindrical metal rod or a flat metal strip.
When a power system is in lightning stroke fault, the lightning current amplitude is mostly concentrated in 10-200 kA, and most of the lightning current amplitudes exceed 20kA according to the actually acquired lightning current waveform. When the power system has short-circuit fault, the current amplitude is up to thousands of amperes, the duration time can reach millisecond level, the short-time energy is extremely large, the temperature rise of the grounding body per se is increased rapidly, the overhigh temperature rise influences the working state of the grounding body, even damages the grounding body or related connecting pieces, and threatens the stable operation of the power system.
Therefore, the ground contact is required to have high conductivity efficiency to promote the flow of current. Since lightning current and fault current are high-frequency conduction currents, when the lightning current and the fault current are dispersed through a grounding body of a power system, high-frequency and high-amplitude impact currents are concentrated on the surface of a grounding wire due to the existence of a skin effect (or called skin effect), the central current density of a conductor is small, the utilization rate of the grounding wire or the grounding body is low, and the grounding material with excellent conductivity is difficult to fully exert the conductivity effect.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a graphite composite grounding body with high conductor utilization rate and high conductive efficiency.
A graphite composite grounding body comprises an inner core, an intermediate layer and a braid layer which are arranged from inside to outside; wherein,
the inner core is a heat-resistant fiber bundle consisting of single or a plurality of heat-resistant fibers;
the middle layer coats the inner core and comprises graphite layers and flow equalizing layers which are sequentially alternated; the graphite layer is formed by closely arranging composite graphite wires along the circumferential direction of the inner core, and the axis of the composite graphite wires is parallel to the axis of the inner core; the current equalizing layer comprises two layers of metal sheets and a metal wire layer positioned between the two layers of metal sheets, and the metal wire layer is formed by closely arranging metal wires along the circumferential direction of the inner core;
the braided layer is formed by braiding the composite graphite wire around the outer side of the middle layer.
The utility model discloses the center that through-flow density is minimum, the utilization efficiency is minimum at grounding body during operation has set up the inner core that single or many heat-resisting fibre are constituteed, will participate in the graphite layer of electrically conductive free flow, the layer structure homodisperse that flow equalizes to the grounding body skin when guaranteeing grounding body overall structure stability, high temperature resistance, improved the conductor utilization ratio on graphite layer, the layer of flow equalizing to improve the holistic electrically conductive efficiency of grounding body.
Simultaneously, the setting of inner core has also increased the radius of whole grounding body and the area of contact between with soil, can reduce contact resistance from this, increases the ground connection of grounding body and falls to hinder the effect.
In addition, due to the existence of the metal sheets in the current equalizing layer, all the metal wires which are arranged in parallel are effectively connected, so that the phenomena of overlarge current, uneven temperature rise and even fusing of local metal wires caused by improper contact are prevented; the flow equalizing layer is arranged between the two layers of composite graphite wire layers, and heat generated when the metal wires or the metal sheets flow through the metal sheets is effectively and uniformly dispersed on the whole composite graphite wire layer through the transmission of the metal sheets, so that the damage to individual composite graphite wires caused by uneven heat distribution is effectively prevented.
In one embodiment, the heat-resistant fibers are one or more of carbon fibers, mullite fibers, and polyimide fibers.
In one embodiment, the cross-sectional area of the inner core is 20-80% of the cross-sectional area of the graphite composite grounding body. Preferably 30%.
In one embodiment, the composite graphite strands are twisted from a composite graphite tape comprising two layers of vermicular graphite and skeletal fibers laid between the two layers of vermicular graphite.
In one embodiment, the thickness of the vermicular graphite layer is 0.1-1 mm.
In one embodiment, the skeleton fiber is one or more of glass fiber, carbon fiber, metal fiber and synthetic fiber.
In one embodiment, the thickness of the metal sheet is 0.05-0.5 mm.
In one embodiment, the metal sheet is a copper sheet, an aluminum sheet or a platinum sheet.
In one embodiment, the metal wire is a copper wire, an aluminum wire or a platinum wire.
In one embodiment, the number of the flow equalizing layers is 1-5.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a graphite composite grounding body has set up the inner core that single or many heat-resisting fibre are constituteed through the center that through-flow density is minimum, the utilization efficiency is the lowest at grounding body during operation, and is inconvenient at graphite, metal quantity, under reduce cost's the prerequisite, can effectively promote the ground connection of conductor utilization ratio and grounding body and fall and hinder the effect to reduce the grounding body temperature rise that short-time lightning current or short-circuit current lead to, engineering practical application effect is showing.
Drawings
Fig. 1 is a schematic structural view of a graphite composite grounding body according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a graphite composite grounding body according to another embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of the inner core of the graphite composite grounding body;
fig. 4 is a schematic cross-sectional view of the composite graphite wire in the graphite composite grounding body;
fig. 5 is a schematic structural diagram of a graphite layer in the graphite composite grounding body;
fig. 6 is a schematic cross-sectional view of the metal wire in the graphite composite grounding body;
fig. 7 is a schematic structural view of a metal sheet in the graphite composite grounding body;
fig. 8 is a schematic structural view of a current-sharing layer in the graphite composite grounding body; wherein,
11-an inner core; 12-an intermediate layer; 13-a woven layer; 121-graphite layer; 122-flow equalization layer; 123-a metal sheet; 124-wire layer.
Detailed Description
The composite graphite grounding body of the present invention will be described in further detail with reference to the following embodiments.
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the graphite composite grounding body of the present embodiment includes an inner core 11, an intermediate layer 12 and a braid layer 13 arranged from inside to outside; wherein,
the inner core 11 is a heat-resistant fiber bundle consisting of single or a plurality of heat-resistant fibers;
the intermediate layer 12 coats the inner core 11 and comprises a graphite layer 121 and a flow equalizing layer 122 which are sequentially alternated; the graphite layer 121 is formed by closely arranging composite graphite wires along the circumferential direction of the inner core 11, and the axis of the composite graphite wires is parallel to the axis of the inner core 11; the current equalizing layer 122 is composed of two layers of metal sheets 123 and a metal wire layer 124 positioned between the two layers of metal sheets 123, and the metal wire layer 124 is formed by closely arranging metal wires along the circumferential direction of the inner core;
the braid 13 is formed by braiding a composite graphite wire around the outside of the intermediate layer 12, and one of the roles thereof is to fix the overall shape and size of the composite ground body.
The sectional area of the inner core 11 is 30% of the sectional area of the graphite composite grounding body. It will be appreciated that in other embodiments, the inner core 11 may be provided with other cross-sectional areas.
The heat-resistant fiber can be one or more of carbon fiber, mullite fiber and polyimide fiber. It is understood that other heat resistant fibers having high decomposition temperatures may be used in other embodiments.
The composite graphite strip is obtained by twisting a composite graphite strip with the width of 10-25 mm by a twisting machine, the composite graphite strip comprises two layers of worm graphite layers and skeleton fibers laid between the two layers of worm graphite layers, the interval between the adjacent skeleton fibers is 0.5-1.2 mm, and in order to facilitate laying, an adhesive can be specifically adopted for bonding. It will be appreciated that in other embodiments, other widths of composite graphite tape or spacing of the matrix fibers may be used.
The worm graphite layer is formed by pressing a worm graphite roller, the thickness of the worm graphite layer is 0.1-1 mm, the thickness of the worm graphite layer is too large, and the composite graphite belt is easy to break during twisting. It will be appreciated that in other embodiments, other thicknesses of layers of vermicular graphite may be used.
The skeleton fiber is one or more of glass fiber, carbon fiber, metal fiber and synthetic fiber.
The thickness of the metal sheet 123 is 0.05-0.5 mm, and the metal sheet can be a copper sheet, an aluminum sheet or a platinum sheet; the diameter of the metal wire is about 1.5mm, and the metal wire can be a copper wire, an aluminum wire or a platinum wire. It is understood that in other embodiments, the metal sheet or wire may be a low resistivity metal material of other dimensions.
The number of the flow equalizing layer 122 is preferably 1 to 5, and in this embodiment, 1. It is understood that in other embodiments, a greater number of current equalizing layers 122 may be used.
As shown in fig. 2, in another embodiment of the graphite composite grounding body, the number of the flow equalizing layer 122 is 2.
Therefore, the utility model discloses a graphite composite grounding body has set up the inner core that single or many heat-resisting fibre are constituteed through the center that through-flow density is minimum, the utilization efficiency is the lowest at grounding body during operation, and is inconvenient at graphite, metal quantity, and under reduce cost's the prerequisite, the ground connection that can effectively promote conductor utilization ratio and grounding body falls and hinders the effect.
The graphite composite grounding body can be manufactured by the following manufacturing method:
(1) the inner core 11 is formed by arranging single or a plurality of heat-resistant fiber bundles in parallel, and the figure 3 is a schematic cross-sectional view of the inner core;
(2) preparing a composite graphite wire:
the main preparation raw materials of the composite graphite wire comprise vermicular graphite, a binder and skeleton fibers, wherein in one specific embodiment, the vermicular graphite is high-purity vermicular graphite with the carbon content higher than 85%, and the binder can adopt an ethyl acrylate water-soluble binder or a resin water-soluble binder;
rolling the worm graphite to prepare worm graphite paper with smooth and flat surface and uniform thickness;
soaking the surface layer of the skeleton fiber by using an adhesive, and laying the skeleton fiber between an upper layer of worm graphite paper and a lower layer of worm graphite paper; then, keeping the temperature of 80-120 ℃ for 60-100 seconds for thermosetting treatment; rolling for more than two times to obtain composite graphite paper;
cutting the composite graphite paper along a direction parallel to the axis of the skeleton fiber to obtain a composite graphite tape, wherein the surface of the composite graphite tape is smooth and flat, and the surface layer of the graphite tape is exposed without the skeleton fiber;
twisting the composite graphite tape by a twisting machine to obtain a composite graphite wire, wherein the schematic cross-sectional view is shown in FIG. 4;
(3) the graphite layer 121 is made outside the inner core 11
The composite graphite wires are closely arranged on the outer layer of the inner core 11 along the circumferential direction of the inner core 11 to form a graphite layer 121, as shown in fig. 5;
(4) a flow equalizing layer 122 is manufactured outside the graphite layer 121
The graphite layer 121 is tightly coated by the metal sheets 123, metal wires are tightly arranged on the outer sides of the metal sheets 123 along the circumferential direction of the inner core 11 to form metal wire layers 124, the metal wire layers 124 are tightly coated by another metal sheet 123 with the same thickness, and the two metal sheets 123 and the metal wire layers 124 form a flow equalizing layer 122, which is shown in fig. 6-8;
(5) on the outer layer of the current equalizing layer 122, the intermediate layer 12 with the corresponding current equalizing layer number can be obtained by repeating or not repeating the steps (3) to (4) according to the requirement;
(6) and (3) performing cross weaving on the outer side of the middle layer 12 by adopting a composite graphite wire to obtain a weaving layer 13.
Specifically, the utility model relates to a preparation method of graphite composite grounding body as follows:
a single carbon fiber bundle with the diameter of 10mm is adopted to form an inner core;
the first graphite layer is formed by 12 composite graphite wires with the diameter of 2.2mm which are closely and parallelly arranged along the perimeter direction of the inner core, and the first flow equalizing layer is made of 18 copper wires with the diameter of about 1.5mm and two copper foils with the thickness of 0.1 mm;
the second graphite layer is formed by 20 composite graphite wires with the diameter of 2.2mm which are closely arranged along the perimeter direction of the inner core, and the second flow equalizing layer is made of 24 copper wires with the diameter of 1.5mm and two copper foils with the thickness of 0.1 mm;
and the outer side of the second flow equalizing layer is crosswise woven by adopting 24 composite graphite wires with the diameter of 2.2mm, and the graphite composite grounding body is obtained.
The resistance per meter of the composite grounding body is about 0.5m omega by four-level resistance measurement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A graphite composite grounding body is characterized by comprising an inner core, an intermediate layer and a braid layer which are arranged from inside to outside; wherein,
the inner core is a heat-resistant fiber bundle consisting of single or a plurality of heat-resistant fibers;
the middle layer coats the inner core and comprises graphite layers and flow equalizing layers which are sequentially alternated; the graphite layer is formed by closely arranging composite graphite wires along the circumferential direction of the inner core, and the axis of the composite graphite wires is parallel to the axis of the inner core; the current equalizing layer comprises two layers of metal sheets and a metal wire layer positioned between the two layers of metal sheets, and the metal wire layer is formed by closely arranging metal wires along the circumferential direction of the inner core;
the braided layer is formed by braiding the composite graphite wire around the outer side of the middle layer.
2. The graphite composite grounding body of claim 1, wherein the cross-sectional area of the inner core is 20-80% of the cross-sectional area of the graphite composite grounding body.
3. The graphite composite ground contact body of claim 1 or 2, wherein the composite graphite strands are twisted from a composite graphite tape comprising two layers of vermicular graphite and skeletal fibers laid between the two layers of vermicular graphite.
4. The graphite composite grounding body of claim 3, wherein the thickness of the vermicular graphite layer is 0.1-1 mm.
5. The graphite composite grounding body of claim 1 or 2, wherein the thickness of the metal sheet is 0.05-0.5 mm.
6. The graphite composite grounding body of claim 1 or 2, wherein the metal sheet is a copper sheet, an aluminum sheet or a platinum sheet.
7. The graphite composite grounding body of claim 1 or 2, wherein the metal wire is a copper wire, an aluminum wire or a platinum wire.
8. The graphite composite grounding body of claim 1 or 2, wherein the number of the flow equalizing layer is 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620499533.3U CN205692970U (en) | 2016-05-26 | 2016-05-26 | Graphite bonded earth electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620499533.3U CN205692970U (en) | 2016-05-26 | 2016-05-26 | Graphite bonded earth electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205692970U true CN205692970U (en) | 2016-11-16 |
Family
ID=57262420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620499533.3U Active CN205692970U (en) | 2016-05-26 | 2016-05-26 | Graphite bonded earth electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205692970U (en) |
-
2016
- 2016-05-26 CN CN201620499533.3U patent/CN205692970U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2013515613A5 (en) | ||
| CN104638387A (en) | Graphite composite grounding body and manufacturing body thereof | |
| CN105161871B (en) | Strong through-flow bonded earth electrode and preparation method | |
| CN205692970U (en) | Graphite bonded earth electrode | |
| CN205474223U (en) | Heating graphite alkene weaving cloth and scarf, blanket, underwear | |
| CN204760061U (en) | Wisdom is compound plug of graphene modification for energy | |
| CN109433835A (en) | A kind of production method of big specification twisted wire plating welding wire | |
| CN202059598U (en) | Novel carbon fiber planar netted heating element structure | |
| CN104269664A (en) | Low-temperature-rise composite grounding body and preparation method thereof | |
| CN205777814U (en) | Cross-arm steel tower | |
| CN204362340U (en) | A kind of medium-high frequency electromagnetic induction heating coil | |
| CN204966069U (en) | Strong through -flow compound grounding body | |
| CN204792143U (en) | High strength aluminum alloy power cable | |
| CN104582048B (en) | A kind of medium-high frequency electromagnetic induction heating coil | |
| CN209767852U (en) | Graphene heating cable | |
| CN106486182B (en) | A kind of big section water-blocking conductor of submarine cable | |
| CN208985773U (en) | Electric wire | |
| CN202205480U (en) | Round copper wire stranded wire | |
| CN204189971U (en) | A kind of low-temperature-rise bonded earth electrode | |
| CN202677867U (en) | Ice-melting ground line with externally wound insulating copper wire | |
| CN206015210U (en) | Physical characteristics collecting weaving cloth and the tippet of biological characteristic, underwear, blanket can be gathered | |
| CN104575705A (en) | High-conductivity cable | |
| CN217486672U (en) | Flexible netted heating wire | |
| CN109496000A (en) | A kind of environment-friendly type parallel three phase invariable power electric-heating belt | |
| CN202799216U (en) | Heating line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |