CN219891976U - Protective sleeve for electrically and thermally protecting an electrically conductive busbar - Google Patents
Protective sleeve for electrically and thermally protecting an electrically conductive busbar Download PDFInfo
- Publication number
- CN219891976U CN219891976U CN202221849477.3U CN202221849477U CN219891976U CN 219891976 U CN219891976 U CN 219891976U CN 202221849477 U CN202221849477 U CN 202221849477U CN 219891976 U CN219891976 U CN 219891976U
- Authority
- CN
- China
- Prior art keywords
- sleeve
- protective sleeve
- fabric
- fabric sleeve
- silicone coating
- 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.)
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Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 41
- 239000004447 silicone coating Substances 0.000 claims abstract description 29
- 239000003365 glass fiber Substances 0.000 claims abstract description 7
- 239000004753 textile Substances 0.000 claims abstract description 7
- 239000004744 fabric Substances 0.000 claims description 50
- 229920002379 silicone rubber Polymers 0.000 claims description 8
- 239000004945 silicone rubber Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000004944 Liquid Silicone Rubber Substances 0.000 claims description 3
- 238000009954 braiding Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 5
- 229920001296 polysiloxane Polymers 0.000 description 10
- 238000009940 knitting Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Landscapes
- Insulating Bodies (AREA)
Abstract
The utility model relates to a protective sleeve for electrically and thermally protecting an electrically conductive busbar, wherein the protective sleeve (S) is a textile sleeve made of closed-mesh circular warp-knitted glass fiber yarns and coated with a silicone coating which provides high heat and electrical resistance and high flexibility to bending geometries.
Description
Technical Field
The present utility model relates generally to a protective sleeve (sleeve) for protecting electrically and thermally conductive bus bars, and more particularly to a protective fabric sleeve having high resistance to heat and electrical characteristics and high adaptability to bending geometries.
Background
Manufacturers are looking for a product to cover/protect/isolate some electrically conductive components called bus bars. These components are metallic elements that act as electrical conductor systems in power stations or receiving stations where electrical energy is concentrated for distribution or feeding of large capacity devices.
When such power is concentrated, high temperature peaks are generated, and for this reason it is necessary to protect/isolate the metal parts from these temperature peaks.
Protective bushings known in the art for electrically and thermally protecting electrically conductive bus bars are typically made of vinyl, as disclosed for example in KR 100845950B 1, or have heat-shrinkable insulating tubing for bus bars with bent segments, as disclosed in CN 105957591B.
Those protective sleeves known in the art have several drawbacks, such as being heavy, providing significantly improved heat and electrical resistance, and having low lateral elasticity. The disadvantage of low lateral elasticity is evident in CN105957591B, in which a sleeve of larger diameter is first placed over the different curved sections of the busbar and then heat is applied to thermally shrink the sleeve.
It is therefore necessary to provide an alternative to the prior art for covering the gaps found therein by providing a protective sleeve for electrically and thermally protecting an electrically conductive busbar, which provides a higher thermal and electrical protection, which is lighter and which is also made more adaptable to bending geometries, and which can therefore be used for busbars with bent segments.
Disclosure of Invention
To this end, the utility model relates to a protective sleeve for protecting electrically and thermally conductive bus bars.
In contrast to the protective sleeves for busbars known from the prior art, in one feature of the utility model, the protective sleeve is a textile sleeve, in particular made of closed-mesh circular warp-knitted (also called warp-knitted) glass fiber yarns and coated with a silicone (silicone) coating.
Thus, in a fabric sleeve, the mesh is formed vertically in a closed manner and joined to one another between adjacent passes (pass) to provide diagonal and vertical connections, thereby providing a non-disengageable characteristic to the sleeve so woven.
For one embodiment, the protective sleeve is sized and has a determined transverse elasticity (preferably providing an expansion ratio of at least 1:2) to allow the protective sleeve to be sleeved over and tightly cover the continuous straight strip segments of the bus bar extending longitudinally along the intersecting direction and the corresponding intermediate curved flat segments joining the straight strip segments, the determined transverse elasticity being provided by the closed mesh circular warp knit of the fiberglass yarn.
The silicone coating improves the thermal stability and dielectric strength of the protective sleeve and also achieves better coupling when the protective sleeve is sleeved over the bus bar.
Indeed, by means of the silicone coating, the protective sleeve of the present utility model still has a greater ability to adapt to the bending geometry and achieves a greater resistance to heat and electrical characteristics, protecting the bus bars from heat leakage (for example in the cells connected to the bus bars) and from short circuits.
Preferably, the silicone coating completely covers the outer surface of the fabric sleeve.
For a preferred embodiment, the silicone coating is a coating made of silicone rubber, such as High Consistency Rubber (HCR) or Liquid Silicone Rubber (LSR).
For variants of the embodiment, the silicone rubber comprises a mixture of at least two silicone components having the same or different weight percentages; and preferably, the mixture has a colorant silicone component in a weight range of between 2% and 10%.
According to one embodiment, the fabric sleeve has been made in a braiding machine having 48 needles at the head and gauge E8 to E12. In this sense, it must be clarified that, without impregnation, the diameter of the fabric sleeve is that of the product with 48 needles on the head and with a gauge of E8 to E12; this head/needle ratio is from the formula:
wherein:
cylindrical diameter in inches
π：3.1416
E: machine gauge
This head/needle ratio gives a fabric sleeve with an expansion ratio of 1:2.
According to one embodiment, the glass fiber yarn has a number (title) ranging from 34/2 tex (tex) to 136/6 tex.
For one embodiment, the fabric sleeve has a weight ranging from 50g/m to 90g/m; preferably, the fabric sleeve has a weight ranging from 55g/m to 85g/m; and more preferably, the fabric sleeve has a weight ranging from 58g/m to 78g/m.
According to one embodiment, the fabric sleeve ranges from 2 to 12, preferably ranges from 3 to 5, and ranges from 2 to 8, preferably ranges from 2 to 4, in the rest position before the fabric sleeve is coated with the silicone coating; when the fabric sleeve does not cover the busbar and when the fabric sleeve is coated with the silicone coating, the fabric sleeve ranges from 2 to 12 needle steps/cm, preferably ranges from 5 to 7 needle steps/cm, and ranges from 2 to 10 wiles/cm, preferably ranges from 6 to 9 wiles/cm in the rest position.
For one embodiment, the fabric sleeve has an optical coverage coefficient ranging from 75% to 90% prior to being coated with the silicone coating; and when the fabric sleeve is coated with the silicone coating, the fabric sleeve has an optical coverage factor of 100% when the silicone coating covers all openings defined in the fabric sleeve.
For one embodiment, the fabric sleeve has a warp length ranging from 1 millimeter to 5 millimeters and a weft length ranging from 2 millimeters to 6 millimeters before the fabric sleeve is coated with the silicone coating; and when the fabric sleeve is coated with the silicone coating, the fabric sleeve has a warp length ranging from 1 millimeter to 6 millimeters and a weft length ranging from 1 millimeter to 4 millimeters.
According to one embodiment, the fabric sleeve has a wall thickness ranging from 0.2mm to 2mm, preferably about 1.15mm + -0.25 mm.
The utility model also includes embodiments that combine the above embodiments to define a range of different characteristics for the fabric sleeve.
In particular, the embodiment combining at least the above-mentioned wall thickness and weight ranges provides a protective sleeve that does have a greater capacity to accommodate bending geometries and small spaces in which the bus bars are mounted, without the protective sleeve needing to modify those mounting spaces, since the protective sleeve occupies a minimum space in the compartment in which the cells are located.
Compared with the protection sleeve in the prior art, the protection sleeve has the main advantages that: higher transverse elasticity, lighter weight, higher thermal stability and higher yield.
Drawings
Some preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. These embodiments are provided for illustrative purposes only and do not limit the scope of the utility model.
Fig. 1 schematically shows a protective sleeve of the present utility model tightly fitted over a bus bar having different segments, including curved segments.
Fig. 2 shows an enlarged portion of the fabric sleeve of the present utility model, showing the weave structure of the fabric sleeve, wherein the vertical arrow pointing upward shows the direction of the weaving process.
Fig. 3 is a graph graphically showing the results of an elasticity test performed using a built prototype of the sleeve of the present utility model.
Detailed Description
In this section, some working embodiments of the present utility model will be described with reference to the accompanying drawings.
In particular, fig. 1 shows a protective/textile sleeve S of the present utility model that fits snugly over and tightly covers an electrically conductive busbar B, in particular, over and tightly covers a continuous straight strip-shaped section of busbar B extending longitudinally in the intersecting direction indicated by arrows X, Y and Z in the figure, and also tightly covers a continuous straight strip-shaped section of busbar B extending longitudinally in the intersecting direction indicated by arrows X, Y and Z in the figure, and also tightly covers and tightly covers a middle curved flat section joining the straight strip-shaped sections. The high transverse elasticity of the sleeve S provided by the circular warp knit of glass fiber yarns makes the sleeve S suitable for fitting over a busbar B having such a varying geometry (i.e. comprising several and different curved segments).
Fig. 2 shows a knitting structure for knitting glass fiber yarns to produce a textile sleeve S, in particular a closed-mesh circular warp knitting structure. As shown in this figure, the fabric sleeve mesh is formed vertically in a closed manner and is joined to one another between adjacent passes to provide diagonal and vertical connections, thereby providing a non-disengageable characteristic to the sleeve so woven.
This braided structure is chosen primarily due to the lateral elasticity provided thereby, which enables the sleeve S to elastically deform to expand and contract as it is fitted over the busbar B, even along busbar segments having complex radii of curvature as shown in fig. 1.
The inventors produced a prototype of a protective sleeve S, coated a textile sleeve with a silicone coating made of silicone rubber comprising a mixture of two silicone components, in particular silicone rubberThe a and B components of 590EU have the same weight percent, in particular the weight percent is 47.5%, and the colorant silicone component, in particular the 5% weight orange Ral2004.
The prototype produced had the following characteristics:
wall thickness (of the final product): 1.15 mm.+ -. 0.25mm
Weight (silicone coated): 70g/m + -20 g/m
Cannula diameter: 17mm
-yarn count: 48
Number of needle steps/cm (without silicone coating and in rest position): 6
Number of needle steps/cm (silicone coated and in rest position): 4.3
Wiles density (no silicone coating and in rest position): 2.86, the wiles density is calculated using the following formula:
wiles density (silicone coated and in rest position): 7.67
-a warp length (without silicone coating) ranging from 1 to 5mm
Weft lengths (without silicone coating) ranging from 2 to 6 mm
-a warp length (coated with silicone) ranging from 1 to 6 mm
Weft lengths (with silicone coating) ranging from 1 mm to 4 mm
Prototypes have been submitted to the application paper (essays), obtaining the following values:
o 5 min heat resistance test at 500℃pass
o dielectric strength test: for a value of 4.7kV
The dielectric strength test is not carried out on the gauge, but directly on the busbar B to be sheathed. When the bus bar B is sheathed with the protective sleeve S, a part of the sheathed bus bar B is wrapped in a silver foil, and the end of the bus bar B is placed in the eddy current of the measuring device, and then the test is started, thereby providing the result of the above determination.
The casing prototype has been subjected to an elasticity test according to the ISO 2062 standard for determining the lateral elasticity of the casing, the parameters being as follows:
pretightening force: 10N
Test speed: 100 mm/min
The test results are shown in fig. 3 and in the following table for test numbers 1, 2 and 3 with three corresponding waveforms:
the test results show 100% lateral elasticity, i.e. an expansion ratio of 1:2, which means that the diameter of the casing can reach 34 mm when fully expanded.
Variations and modifications may be introduced in the described embodiments by a person skilled in the art without departing from the scope of the utility model as defined in the appended claims.
Claims (14)
1. A protective sleeve for electrically and thermally protecting an electrically conductive busbar, characterized in that the protective sleeve (S) is a textile sleeve made of closed-mesh circular warp-knitted glass fiber yarn and coated with a silicone coating.
2. The protective sleeve of claim 1 wherein said silicone coating completely covers an outer surface of said fabric sleeve.
3. The protective sleeve according to claim 1 or 2, wherein the silicone coating is made of silicone rubber, wherein the silicone rubber is a high consistency rubber or a liquid silicone rubber.
4. A protective sleeve according to claim 1, characterized in that the protective sleeve (S) is dimensioned and has a determined transverse elasticity to allow the protective sleeve (S) to be slipped over the continuous flat strip-shaped sections of the busbar (B) extending longitudinally in the cross direction (X, Y; X, Z; Y, Z) and the corresponding intermediate curved flat sections joining the flat strip-shaped sections and to tightly cover the continuous flat strip-shaped sections of the busbar (B) extending longitudinally in the cross direction (X, Y; X, Z; Y, Z) and the corresponding intermediate curved flat sections joining the flat strip-shaped sections, the determined transverse elasticity being provided by the circular warp knit of the glass fiber yarn.
5. The protective sleeve according to claim 1, characterized in that the textile sleeve has been produced in a braiding machine having 48 needles at the head and a gauge E8 to E12.
6. The protective sleeve of claim 1 wherein said fiberglass yarn has a number ranging from 34/2 tex to 136/6 tex.
7. The protective sleeve of claim 1 wherein said fabric sleeve has a weight ranging from 50g/m to 90g/m.
8. The protective sleeve of claim 7 wherein said fabric sleeve has a weight ranging from 55g/m to 85g/m.
9. The protective sleeve of claim 8 wherein said fabric sleeve has a weight ranging from 58g/m to 78g/m.
10. The protective sleeve of claim 1 wherein said fabric sleeve ranges from 2 to 12 needle steps/cm and from 2 to 8 wiles/cm in a rest position before said fabric sleeve is coated with said silicone coating; when the fabric sleeve does not cover the busbar and when the fabric sleeve is coated with the silicone coating, the fabric sleeve ranges from 2 to 12 needle steps/cm and from 2 to 10 wils/cm in the rest position.
11. The protective sleeve of claim 10 wherein said fabric sleeve ranges from 3 to 5 needle steps/cm and from 2 to 4 wiles/cm in a rest position before said fabric sleeve is coated with said silicone coating; when the fabric sleeve does not cover the busbar and when the fabric sleeve is coated with the silicone coating, the fabric sleeve ranges from 5 to 7 needle steps/cm and from 6 to 9 wiles/cm in the rest position.
12. The protective sleeve of claim 1 wherein said fabric sleeve has an optical coverage factor ranging from 75% to 90%; and when the fabric sleeve is coated with the silicone coating, the fabric sleeve has an optical coverage factor of 100% when the silicone coating covers all openings defined in the fabric sleeve.
13. The protective sleeve of claim 1 wherein said fabric sleeve has a warp length ranging from 1 millimeter to 5 millimeters and a weft length ranging from 2 millimeters to 6 millimeters before said fabric sleeve is coated with said silicone coating; and when the fabric sleeve is coated with the silicone coating, the fabric sleeve has a warp length ranging from 1 millimeter to 6 millimeters and a weft length ranging from 1 millimeter to 4 millimeters.
14. The protective sleeve of claim 1 wherein said fabric sleeve has a wall thickness ranging from 0.2 millimeters to 2 millimeters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21186297 | 2021-07-19 | ||
| EP21186297 | 2021-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219891976U true CN219891976U (en) | 2023-10-24 |
Family
ID=76971670
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221849477.3U Active CN219891976U (en) | 2021-07-19 | 2022-07-18 | Protective sleeve for electrically and thermally protecting an electrically conductive busbar |
| CN202210843372.5A Pending CN115642005A (en) | 2021-07-19 | 2022-07-18 | Protective sleeve and method for obtaining a protective sleeve |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210843372.5A Pending CN115642005A (en) | 2021-07-19 | 2022-07-18 | Protective sleeve and method for obtaining a protective sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN219891976U (en) |
-
2022
- 2022-07-18 CN CN202221849477.3U patent/CN219891976U/en active Active
- 2022-07-18 CN CN202210843372.5A patent/CN115642005A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN115642005A (en) | 2023-01-24 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |