CN217113923U - Medium-voltage power cable with self-checking function - Google Patents
Medium-voltage power cable with self-checking function Download PDFInfo
- Publication number
- CN217113923U CN217113923U CN202220201976.5U CN202220201976U CN217113923U CN 217113923 U CN217113923 U CN 217113923U CN 202220201976 U CN202220201976 U CN 202220201976U CN 217113923 U CN217113923 U CN 217113923U
- Authority
- CN
- China
- Prior art keywords
- layer
- retardant polyolefin
- low
- smoke
- shielding layer
- 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
Images
Landscapes
- Insulated Conductors (AREA)
Abstract
The utility model relates to the technical field of wires and cables, and discloses a medium-voltage power cable with self-checking function, which comprises a conductor body, wherein a cross-linked structure is arranged outside the conductor body, one side of the cross-linked structure, which is far away from the conductor body, is provided with a shielding structure, one side of a stainless steel protective layer, which is far away from a low-smoke halogen-free flame-retardant polyolefin inner sheath, is provided with a low-smoke halogen-free flame-retardant polyolefin outer sheath, and one side of the low-smoke halogen-free flame-retardant polyolefin outer sheath, which is far away from the stainless steel protective layer, is provided with a semi-conductive flame-retardant polyolefin thin layer; through the semi-conductive flame retardant polyolefin thin layer, can make the little current that produces between stainless steel protective layer and the semi-conductive flame retardant polyolefin thin layer after its sheath is damaged, make equipment monitoring end produce alarm signal, inform the staff to maintain, eliminate hidden danger to reach and prevent that 35kV outer jacket damage from making operational environment produce dangerous effects such as contact voltage and step voltage.
Description
Technical Field
The utility model belongs to the technical field of wire and cable, a structural design and the manufacturing process of technology of cable are related to, specifically are a take middling pressure power cable of self-checking function.
Background
Along with the rapid development of economy in China, the process of urban modernization is obviously accelerated, and meanwhile, the support of power transmission is not removed, so in recent years, the power construction of various large, medium and small cities is also rapidly and rapidly built and developed, the development and construction of long distance, high power and low loss which are more economical are considered, the adoption of high-voltage transmission power is the current optimal choice, and the adoption of 110kV voltage for power transmission and voltage conversion in the construction of domestic cities is accompanied with the construction of 110kV transformer substations throughout various cities.
However, such high voltage class inevitably places safety at the first place, and the most dangerous place of the 110kV transformer substation is too much to be the working place in the transformer substation, especially the electric energy transmission part after the 110kV voltage class is converted to 35kV, including the incoming and outgoing lines of the 35kV switch cabinet, the access of SVG, the access of the station transformer and the grounding of the grounding transformer, etc., which are the parts normally contacted by the working personnel, so the safety must be ensured.
Therefore, the demand for high-reliability products is urgent, and a medium-voltage power cable with a self-checking function is provided, which has the advantage of preventing the damage of a 35kV outer protective layer to cause the danger of contact voltage, step voltage and the like in the working environment, so as to solve the above problems.
SUMMERY OF THE UTILITY MODEL
For realize above-mentioned prevent that the damaged messenger operational environment of 35kV outer jacket from producing dangerous mesh such as contact voltage and step voltage, the utility model discloses mainly be applied to 110kV voltage level and change the electric energy transmission part behind 35kV, provide following technical scheme: the utility model provides a take middling pressure power cable of self-checking function, includes the conductor body, the outside of conductor body is provided with crosslinked structure, one side that the conductor body was kept away from to crosslinked structure is provided with shielding structure, one side that shielding structure kept away from crosslinked structure is provided with low smoke and zero halogen flame retardant polyolefin inner sheath, one side that shielding structure was kept away from to low smoke and zero halogen flame retardant polyolefin inner sheath is provided with the stainless steel protective layer, one side that low smoke and zero halogen flame retardant polyolefin inner sheath was kept away from to the stainless steel protective layer is provided with low smoke and zero halogen flame retardant polyolefin oversheath, one side that stainless steel protective layer was kept away from to low smoke and zero halogen flame retardant polyolefin oversheath is provided with semiconduction flame retardant polyolefin thin layer.
Preferably, the cross-linked structure comprises a conductor shielding layer, an insulating layer is arranged on one side, away from the conductor shielding layer, of the conductor shielding layer, and an insulating shielding layer is arranged on one side, away from the conductor shielding layer, of the insulating layer.
Preferably, the shielding structure comprises a copper wire shielding layer, a reverse-binding copper tape layer is arranged on one side, close to the low-smoke halogen-free flame-retardant polyolefin inner sheath, of the copper wire shielding layer, and a glass fiber tape is arranged on one side, far away from the copper wire shielding layer, of the reverse-binding copper tape layer.
As optimization, the low-smoke halogen-free flame-retardant polyolefin inner sheath and the low-smoke halogen-free flame-retardant polyolefin outer sheath are made of high-flame-retardant halogen-free low-smoke cable materials, and the oxygen index of the materials is higher than that of the high-flame-retardant halogen-free low-smoke cable materials, so that the cable is difficult to burn even in the case of fire.
Preferably, the semi-conductive flame-retardant polyolefin thin layer is extruded on the outermost layer of the cable and has a conductive function, so that micro-current is generated between the stainless steel protective layer and the semi-conductive flame-retardant polyolefin thin layer after a sheath of the semi-conductive flame-retardant polyolefin thin layer is damaged, and an alarm signal is generated at an equipment monitoring end.
And optimally, the conductor shielding layer, the insulating layer and the insulating shielding layer are formed by one-time extrusion in a 35kV catenary production line, so that the eccentricity of the cable insulating structure is ensured.
As optimization, the shielding structure adopts a combined structure of a copper wire shielding layer, a copper wire shielding layer and a reverse-pricked copper strip layer, and the sectional area for transmitting fault current is ensured.
As optimization, the conductor body is made of oxygen-free red copper with the purity of 99.999%, the stainless steel protective layer is armored by stainless steel strips, eddy current loss generated by current in the use process of the cable can be well reduced, and the stainless steel strips can well protect the cable against pressure.
The utility model has the advantages that:
1. this medium voltage power cable of area self-checking function, through the good thermal-insulated oxygen performance that low smoke and zero halogen flame retardant polyolefin inner sheath and low smoke and zero halogen flame retardant polyolefin oversheath material self had, can play the flame retardant action to the cable effectively, and simultaneously, because the material is the low smoke and zero halogen material itself, inorganic flame retardant aluminium hydroxide decomposes into aluminium oxide and water when the cable burns, aluminium oxide after the generation can form shell structure and incombustible, the water that produces simultaneously has the effect of fire-retardant and cooling, and the toxicity that produces and corrosive gas release amount are few during the cable burns, the smog concentration of production is extremely low, can not produce harm to personnel and equipment, fire-retardant effect is splendid, provide reliable assurance for the rescue of life and flee, thereby reach the effect that reduces danger.
2. This medium voltage power cable of taking self-checking function, the semi-conductive fire-retardant polyolefin thin layer that the one deck has electrically conductive function is crowded to wrap the one deck again on the outer jacket of cable, wherein adopt the double-deck crowded equipment of extruding of confession to extrude simultaneously and accomplish crowded package process, so can make to produce little current between stainless steel protective layer and the semi-conductive fire-retardant polyolefin thin layer after its sheath is damaged, make equipment monitoring end produce alarm signal, inform the staff to maintain, eliminate hidden danger, thereby reach and prevent that 35kV outer jacket damage makes operational environment produce dangerous effects such as contact voltage and stride step voltage.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is an enlarged schematic view of the shielding structure at a position in fig. 1 according to the present invention.
In the figure: 1. a conductor body; 2. a crosslinked structure; 21. a conductor shield layer; 22. an insulating layer; 23. an insulating shield layer; 3. a shielding structure; 31. a copper wire shielding layer; 32. reversely binding the copper tape layer; 33. wrapping a glass fiber tape; 4. a low-smoke halogen-free flame-retardant polyolefin inner sheath; 5. a stainless steel protective layer; 6. a low-smoke halogen-free flame-retardant polyolefin outer sheath; 7. a thin semiconductive flame retardant polyolefin layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a medium voltage power cable with a self-checking function includes a conductor body 1, the conductor body 1 is made of oxygen-free red copper with a purity of 99.999% and adopts a normal twisting manner, a second type of conductor structure has a resistance meeting the requirement of GB/3956-;
the stainless steel protective layer 5 is armored by a stainless steel strip, so that eddy current loss generated by current in the using process of the cable can be well reduced, the stainless steel strip armor can play a good compression-resistant protection role on the cable, one side of the stainless steel protective layer 5, which is far away from the low-smoke halogen-free flame-retardant polyolefin inner sheath 4, is provided with the low-smoke halogen-free flame-retardant polyolefin outer sheath 6, the low-smoke halogen-free flame-retardant polyolefin inner sheath 4 and the low-smoke halogen-free flame-retardant polyolefin outer sheath 6 are both made of high-flame-retardant halogen-free low-smoke cable materials, and the oxygen index of the materials is higher than 50, so that the cable is difficult to burn even in the case of fire;
the high flame-retardant halogen-free low-smoke cable material is prepared by taking polymer materials such as polyolefin and the like as main base materials, containing special halogen-free flame retardant and smoke suppressor, and precisely mixing and processing by a special formula;
one side that low smoke and zero halogen fire-retardant polyolefin oversheath 6 kept away from stainless steel protective layer 5 is provided with semiconduction fire-retardant polyolefin thin layer 7, and the crowded package of semiconduction fire-retardant polyolefin thin layer 7 is at the outmost of cable, and semiconduction fire-retardant polyolefin thin layer 7 has electrically conductive function, in order to make to produce little current between stainless steel protective layer 5 and the semiconduction fire-retardant polyolefin thin layer 7 after its sheath is damaged to make equipment monitoring end produce alarm signal.
Referring to fig. 1-2, the cross-linked structure 2 includes a conductor shielding layer 21, an insulating layer 22 is disposed on a side of the conductor shielding layer 21 away from the conductor shielding layer 21, an insulating shielding layer 23 is disposed on a side of the insulating layer 22 away from the conductor shielding layer 21, and the conductor shielding layer 21, the insulating layer 22 and the insulating shielding layer 23 are formed by one-step extrusion in a 35kV catenary production line, so as to ensure eccentricity of the cable insulating structure;
In use, referring to fig. 1-2, the conductor body 1 adopts a regular twisting manner and is a two-type conductor structure, and the resistance thereof meets the requirements of GB/3956-;
the cross-linked structure 2 comprises a conductor shielding layer 21, an insulating layer 22 and an insulating shielding layer 23, and a totally-enclosed chemical cross-linking process is adopted by adopting a three-layer co-extrusion technology, so that the eccentricity is controlled within 10%; the shielding structure 3 comprises a copper wire shielding layer 31 made of 1.0mm annealed soft copper wires, a reverse-binding copper strip layer 32 made of reverse-binding 0.1mm copper strip gaps and a binding gap rate not greater than 200%;
the stainless steel protective layer 5 is armored by a stainless steel strip, so that the eddy current loss generated by current in the use process of the cable can be well reduced, and the stainless steel strip armor has a good compression-resistant protection effect on the cable; the low-smoke halogen-free flame-retardant polyolefin inner sheath 4 is prepared by taking polymer materials such as polyolefin and the like as main base materials, containing special halogen-free flame retardant and smoke suppressor, and precisely mixing and processing the base materials by a special formula, and has excellent heat insulation and oxygen isolation performance due to high oxygen index of the material and excellent flame retardance and low heat conductivity coefficient of the material;
moreover, the oxygen index of the low-smoke halogen-free flame-retardant polyolefin outer sheath 6 is higher than 50, so that the cable is difficult to burn; the material is a halogen-free low-smoke material, the inorganic flame retardant aluminum hydroxide is decomposed into aluminum oxide and water when the cable is burnt, the generated aluminum oxide can form a shell-shaped structure and is not burnt, and the generated water has the effects of flame retardance and cooling; meanwhile, the release amount of toxic and corrosive gases generated during the cable combustion is very small, the concentration of the generated smoke is very low, the smoke does not harm personnel and equipment, the flame retardant effect is very good, and reliable guarantee is provided for life rescue and escape;
meanwhile, a semiconductive flame-retardant polyolefin thin layer 7 with a conductive function is extruded on the outer protective layer of the cable, wherein a double-layer extrusion device is adopted to extrude the cable to complete the extrusion process, so that micro-current can be generated between the stainless steel protective layer 5 and the semiconductive flame-retardant polyolefin thin layer 7 after the protective sleeve is damaged, an alarm signal is generated at the monitoring end of the device, a worker is informed to maintain the device, and hidden dangers are eliminated.
In conclusion, the medium-voltage power cable with the self-checking function can effectively play a role in flame retardance of the cable by virtue of excellent heat insulation and oxygen isolation performances of the materials of the low-smoke halogen-free flame-retardant polyolefin inner sheath 4 and the low-smoke halogen-free flame-retardant polyolefin outer sheath 6, and meanwhile, because the materials are halogen-free low-smoke materials, the inorganic flame retardant aluminum hydroxide is decomposed into aluminum oxide and water when the cable is burnt, the generated aluminum oxide can form a shell-shaped structure and is not burnt, the generated water has the functions of flame retardance and cooling, the release amount of toxic and corrosive gases generated when the cable is burnt is very small, the concentration of the generated smoke is very low, the generated smoke cannot be harmful to personnel and equipment, the flame retardance effect is very good, and reliable guarantee is provided for life rescue and escape, so that the effect of reducing dangerousness is achieved;
through crowded package one deck semiconductive flame retardant polyolefin thin layer 7 that has electrically conductive function again on the outer jacket of cable, wherein adopt double-deck confession crowded equipment of extruding to extrude simultaneously and accomplish crowded package process, so can make to produce little current between stainless steel protective layer 5 and the semiconductive flame retardant polyolefin thin layer 7 after its sheath is damaged, make equipment monitoring end produce alarm signal, inform the staff to maintain, eliminate hidden danger, thereby reach and prevent that 35kV outer jacket is damaged to make operational environment produce dangerous effects such as contact voltage and step voltage.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model discloses the standard parts that use all can purchase from the market, and dysmorphism piece all can be customized according to the record of the description with the drawing.
Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.
Claims (7)
1. The utility model provides a take middling pressure power cable of self-checking function, includes conductor body (1), its characterized in that: the outside of conductor body (1) is provided with crosslinked structure (2), one side that conductor body (1) was kept away from in crosslinked structure (2) is provided with shielding structure (3), one side that crosslinked structure (2) were kept away from in shielding structure (3) is provided with low smoke and zero halogen flame retardant polyolefin inner sheath (4), one side that shielding structure (3) were kept away from in low smoke and zero halogen flame retardant polyolefin inner sheath (4) is provided with stainless steel protective layer (5), one side that low smoke and zero halogen flame retardant polyolefin inner sheath (4) were kept away from in stainless steel protective layer (5) is provided with low smoke and zero halogen flame retardant polyolefin oversheath (6), one side that stainless steel protective layer (5) were kept away from in low smoke and zero halogen flame retardant polyolefin oversheath (6) is provided with semi-conductive flame retardant polyolefin thin layer (7).
2. A medium voltage power cable with self-test function according to claim 1, characterized in that: the cross-linked structure (2) comprises a conductor shielding layer (21), an insulating layer (22) is arranged on one side, away from the conductor shielding layer (21), of the conductor shielding layer (21), and an insulating shielding layer (23) is arranged on one side, away from the conductor shielding layer (21), of the insulating layer (22).
3. The medium voltage power cable with the self-test function according to claim 1, wherein: the shielding structure (3) comprises a copper wire shielding layer (31), a reverse-binding copper tape layer (32) is arranged on one side, close to the low-smoke halogen-free flame-retardant polyolefin inner sheath (4), of the copper wire shielding layer (31), and a glass fiber tape wrapping tape (33) is arranged on one side, far away from the copper wire shielding layer (31), of the reverse-binding copper tape layer (32).
4. The medium voltage power cable with the self-test function according to claim 1, wherein: the low-smoke halogen-free flame-retardant polyolefin inner sheath (4) and the low-smoke halogen-free flame-retardant polyolefin outer sheath (6) both adopt high-flame-retardant halogen-free low-smoke cable materials, and the oxygen index of the materials is higher than 50.
5. A medium voltage power cable with self-test function according to claim 1, characterized in that: the semi-conductive flame-retardant polyolefin thin layer (7) is extruded on the outermost layer of the cable.
6. The medium voltage power cable with the self-checking function according to claim 2, characterized in that: the conductor shielding layer (21), the insulating layer (22) and the insulating shielding layer (23) are formed by one-time extrusion of a 35kV catenary production line.
7. The medium voltage power cable with the self-checking function according to claim 3, characterized in that: the shielding structure (3) adopts a combined structure of a copper wire shielding layer (31), the copper wire shielding layer (31) and a reverse-binding copper belt layer (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220201976.5U CN217113923U (en) | 2022-01-25 | 2022-01-25 | Medium-voltage power cable with self-checking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220201976.5U CN217113923U (en) | 2022-01-25 | 2022-01-25 | Medium-voltage power cable with self-checking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217113923U true CN217113923U (en) | 2022-08-02 |
Family
ID=82596059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220201976.5U Active CN217113923U (en) | 2022-01-25 | 2022-01-25 | Medium-voltage power cable with self-checking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217113923U (en) |
-
2022
- 2022-01-25 CN CN202220201976.5U patent/CN217113923U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213241967U (en) | Photoelectric hybrid cable for urban intelligent lamp pole | |
| CN214226590U (en) | Mining medium-voltage flame-retardant fireproof fire-resistant variable frequency cable | |
| CN217113923U (en) | Medium-voltage power cable with self-checking function | |
| CN215600138U (en) | High-temperature-resistant safety wire | |
| CN212209000U (en) | Aluminum alloy medium-voltage fireproof cable for frequency converter | |
| CN212276885U (en) | Intelligent fire-resistant high-voltage cable | |
| CN210443324U (en) | Flame-retardant cable | |
| CN113066614A (en) | Medium-voltage corrugated aluminum sleeve armored power cable | |
| CN111667944A (en) | Water-blocking fireproof special cable | |
| CN221281790U (en) | Flame-retardant fire-resistant wire and cable | |
| CN215988197U (en) | Aluminum alloy co-extrusion insulation irradiation crosslinking halogen-free low-smoke flame-retardant power cable | |
| CN220933798U (en) | New energy environment-friendly fire-resistant wire | |
| CN209980841U (en) | Flame-retardant medium-voltage power cable | |
| CN219143854U (en) | Environment-friendly medium-voltage flame-retardant fire-resistant cable | |
| CN216161507U (en) | Polyolefin medium-voltage cable for ships | |
| CN212624872U (en) | High flame-retardant fire-resistant aluminum alloy cable | |
| CN211087946U (en) | Flexible medium-voltage fireproof cable | |
| CN220821176U (en) | Medium-voltage fire-resistant cable for offshore oil platform | |
| CN217847458U (en) | High-temperature-resistant flexible mineral-insulated fireproof cable | |
| CN215933216U (en) | High-performance B1-grade flame-retardant 35kV looped network power cable | |
| CN218274015U (en) | Cable with double insulation effects for power equipment | |
| CN212516661U (en) | Novel medium-voltage fireproof power cable | |
| CN215770661U (en) | Water-cooled cable | |
| CN215342080U (en) | Environment-friendly medium-voltage fire-resistant cable | |
| CN215342078U (en) | Medium-voltage fire-resistant cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |