CN211556826U - Fully prefabricated dry-type capacitive cable terminal - Google Patents
Fully prefabricated dry-type capacitive cable terminal Download PDFInfo
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- CN211556826U CN211556826U CN202020316025.3U CN202020316025U CN211556826U CN 211556826 U CN211556826 U CN 211556826U CN 202020316025 U CN202020316025 U CN 202020316025U CN 211556826 U CN211556826 U CN 211556826U
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Abstract
The utility model discloses a full prefabricated dry-type electric capacity type cable terminal, it relates to the high-voltage apparatus field. The upper end and the lower end of the dry capacitor core are respectively connected with an upper connecting flange and a lower connecting flange in a sealing way, the outer surface of the dry capacitor core is provided with an increasing climbing umbrella skirt, a cable is led in from the center of the dry capacitor core and is connected with a cable lead connector, the upper connecting flange and an upper cover plate are fixed with the cable lead connector in a sealing way, the lower connecting flange and a lower cover plate are fixed through bolts, the lower cover plate is connected with the cable in a sealing way through a cable sealing box, a grounding terminal is fixed on the lower connecting flange in a sealing way, the grounding terminal is also connected with a cable shielding layer and the dry capacitor core, a supporting insulator is fixed on the lower cover plate, auxiliary insulation is filled between the cable and the dry capacitor. The utility model discloses the product site operation is simple, moves safe and reliable, and the no porcelain is explosion-proof, non-maintaining, non-staining environment to satisfy superhigh pressure and extra-high voltage's operation requirement.
Description
Technical Field
The utility model relates to a high-voltage apparatus field for power system installs the cable terminal at the high tension cable both ends, concretely relates to full prefabricated dry-type electric capacity type cable terminal.
Background
At present, a cable terminal used in a power system is provided with a stress cone on a cable insulation for improving an electric field, a porcelain bushing or a composite hollow insulator is arranged outside the cable insulation, sealing devices are additionally arranged at two ends of the cable terminal, and the cable terminal is filled with insulation liquid for main insulation. The cable terminal adopts the stress cone to improve the electric field, the electric field is concentrated, and flashover accidents are easy to occur under the dirty and sleet weather conditions. And the stress cone can displace during installation and operation, so that field intensity distortion is caused to cause breakdown accidents. In addition, the stress cone structure has poor electric field improvement, so that the operating requirement of the cable for higher voltage operation cannot be met. In addition, since the interior is filled with the insulating liquid, once the insulating liquid leaks or the insulation deteriorates due to moisture, insulation breakdown may be caused, causing explosion of the cable terminal. In order to reduce the occurrence of accidents, frequent maintenance and repair are required.
Based on the reasons, the insulation tapes and the metal capacitance screens are adopted to be alternately wrapped on the insulation surface of the cable in China, and insulation liquid is smeared between the insulation tapes and between the metal capacitance screens to fill gaps, so that the manufactured capacitive type main insulation structure adopts the heat shrink tube as the outer sheath, and the surface of the heat shrink tube is bonded with the silicon rubber creepage increasing skirt to manufacture the cable terminal. The cable terminal adopts a capacitance type voltage-sharing structure, and the axial and radial electric fields of the cable terminal are better improved. However, the product must be wrapped by capacitive insulation on site, the requirements on site environment and skill level of constructors are high, and breakdown accidents are caused by the problems that the product is affected with damp due to site construction, the wrapping tension on site is not uniform, or the wrapping of a capacitive screen is deviated from the designed size. In addition, because insulating liquid is required to be coated between the insulating tapes and between the metal capacitive screens, gaps appear in insulation due to heating and climate change in operation and overflow of the insulating liquid, and the gaps include partial discharge of products and increase of dielectric loss due to respiration, so that breakdown accidents are caused by insulation failure.
To sum up, the utility model discloses a full prefabricated dry-type electric capacity type cable terminal.
SUMMERY OF THE UTILITY MODEL
To the not enough of existence on the prior art, the utility model aims at providing a full prefabricated dry-type electric capacity type cable terminal adopts electric capacity type solid main insulation structure, and all parts are prefabricated in whole mills, and the in-plant pre-installation can dispatch from the factory through the experiment side. Therefore, the product has simple site construction, safe and reliable operation, no porcelain, no explosion, no maintenance and no environmental pollution, and meets the use requirements of ultrahigh pressure and extra-high voltage.
In order to achieve the above purpose, the present invention is realized by the following technical solution: a fully prefabricated dry-type capacitor-type cable terminal comprises a wiring terminal, a cable lead connector, a dry-type capacitor core, an increasing-climbing umbrella skirt, an upper connecting flange, a lower connecting flange, a grounding terminal, a cable sealing box, auxiliary insulation, a supporting insulator, a cable, an upper cover plate, a lower cover plate and a rain cover, wherein the upper end and the lower end of the dry-type capacitor core are respectively connected with the upper connecting flange and the lower connecting flange in a sealing way, the increasing-climbing umbrella skirt is arranged on the outer surface of the dry-type capacitor core, the cable is led in from the center of the dry-type capacitor core and is connected with the cable lead connector, the upper connecting flange and the upper cover plate are fixedly connected with the cable lead connector in a sealing way, the lower connecting flange and the lower cover plate are fixedly connected with the cable through the cable sealing box, the grounding terminal is fixedly sealed on the lower connecting flange, the grounding terminal is also connected, the auxiliary insulation is filled between the cable and the dry-type capacitor core, the rain-proof cover is hermetically connected with the upper connecting flange and the cable lead joint, and the connecting terminal is fixed on the cable lead joint.
Preferably, the dry capacitor core is made of glue-impregnated glass fiber insulation or glue-impregnated paper insulation.
Preferably, the lower cover plate is fixedly connected with the cable terminal bracket through a supporting insulator.
Preferably, the dry capacitor core is made of glue-impregnated glass fiber insulation or glue-impregnated paper insulation.
Preferably, the auxiliary insulation adopts insulation paste, insulation glue and insulationCrude oil or SF6A gas.
The manufacturing method of the fully prefabricated dry-type capacitance cable terminal comprises the following steps:
a. designing a capacitive screen according to the requirements of an electric field, designing the external dimension according to the mechanical property and the structural requirements, and manufacturing a dry type capacitor core;
b. gluing an upper connecting flange and a lower connecting flange on the prefabricated dry capacitor core;
c. installing a silicon rubber climbing-increasing umbrella group on a capacitor core which is well glued with an upper connecting flange and a lower connecting flange;
d. stripping an outer protection layer, an aluminum sheath and an inner protection layer of a cable to be provided with a cable terminal according to the size to expose a crosslinked polyethylene main insulation layer, reserving a cable shielding layer according to the size and cleaning up the cable shielding layer, and stripping the main insulation layer at the end part according to the size to expose a cable conductor;
e. c, after the end conductor of the cable prepared in the step c is reliably connected with the cable lead connector, the cable penetrates out of the capacitor core prefabricated according to the step b from the side of the lower connecting flange, and the upper cover plate is fixed with the upper connecting flange and the cable lead connector in a sealing manner;
f. the lower cover plate is hermetically connected with the lower connecting flange, and the cable sealing box is hermetically connected with the lower cover plate and the cable;
g. the rear lower cover plate is installed according to the steps and is fixedly connected with the cable terminal bracket through the supporting insulator;
h. the grounding terminal is hermetically fixed on the lower connecting flange and is reliably connected with the cable shielding layer and the capacitor core end screen;
i. auxiliary insulation is injected into a gap between the cable and the capacitor core;
j. the rain cover is hermetically connected with the upper connecting flange and the cable lead joint;
k. the terminal is tightly fixed on the cable lead connector.
The utility model has the advantages that: the cable terminal manufactured by the method is of a capacitive solid main insulation structure, all parts are prefabricated in a factory, and the factory can leave a factory through an experiment. Therefore, the product has simple site construction, safe and reliable operation, no porcelain, no explosion, no maintenance and no environmental pollution, and meets the use requirements of ultrahigh pressure and extra-high voltage.
Drawings
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;
fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is an enlarged schematic view of a portion B of fig. 1.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
Referring to fig. 1 to 3, the following technical solutions are adopted in the present embodiment: a fully prefabricated dry-type capacitance cable terminal comprises a wiring terminal 1, a cable lead connector 2, a dry-type capacitor core 3, an increasing climbing umbrella skirt 4, an upper connecting flange 5, a lower connecting flange 6, a grounding terminal 7, a cable sealing box 8, an auxiliary insulation 9, a supporting insulator 10, a cable 11, an upper cover plate 12, a lower cover plate 13 and a rain-proof cover 14, wherein the upper end and the lower end of the dry-type capacitor core 3 are respectively connected with the upper connecting flange 5 and the lower connecting flange 6 in a sealing way, the increasing climbing umbrella skirt 4 is arranged on the outer surface of the dry-type capacitor core 3, the cable 11 is led in from the center of the dry-type capacitor core 3 and is connected with the cable lead connector 2, the upper connecting flange 5 and the upper cover plate 12 are fixed with the cable lead connector 2 in a sealing way, the lower connecting flange 6 and the lower cover plate 13 are fixed through bolts, the lower cover plate 13 is connected with the cable 11 in a sealing way through the cable sealing box 8, the grounding terminal 7 is further connected with the cable shielding layer 11-2 and the dry-type capacitor core 3, the supporting insulator 10 is fixed on the lower cover plate 13, the auxiliary insulation 9 is filled between the cable 11 and the dry-type capacitor core 3, the rain cover 14 is hermetically connected with the upper connecting flange 5 and the cable lead connector 2, and the wiring terminal 1 is fixed on the cable lead connector 2.
The manufacturing method of the fully prefabricated dry-type capacitance cable terminal comprises the following steps:
a. designing a capacitive screen according to the requirements of an electric field, designing the external dimension according to the mechanical property and the structural requirements, and manufacturing a dry type capacitor core 3;
b. gluing an upper connecting flange 5 and a lower connecting flange 6 on a prefabricated dry-type capacitor core 3;
c. installing a silicon rubber climbing-increasing umbrella group 4 on a dry capacitor core 3 which is well glued with an upper connecting flange and a lower connecting flange;
d. stripping an outer protection layer, an aluminum sheath and an inner protection layer of a cable to be provided with a cable terminal according to the size to expose a crosslinked polyethylene main insulation layer 11-1, reserving a cable shielding layer 11-2 according to the size and cleaning up the cable shielding layer, and stripping the main insulation layer at the end part according to the size to expose a cable conductor 11-3;
e. c, after the end conductor of the cable 11 prepared in the step c is reliably connected with the cable lead connector 2, the cable 11 penetrates out of the dry type capacitor core 3 prefabricated according to the step b from the side of the lower connecting flange 6, and the upper cover plate 12, the upper connecting flange 5 and the cable lead connector 2 are sealed and fixed;
f. the lower cover plate 13 is hermetically connected with the lower connecting flange 6, and the cable sealing box 8 is hermetically connected with the lower cover plate 13 and the cable 11;
g. the rear lower cover plate 13 is fixedly connected with the cable terminal bracket through the supporting insulator 10 after being installed according to the steps;
h. the grounding terminal 7 is hermetically fixed on the lower connecting flange 6 and is reliably connected with the cable shielding layer 11-2 and the end screen of the dry-type capacitor core 3;
i. auxiliary insulation 9 is injected into the gap between the cable 11 and the dry-type capacitor core 3;
j. the rain cover 14 is hermetically connected with the upper connecting flange 5 and the cable lead connector 2;
k. the connecting terminal 1 is tightly fixed on the cable lead connector 2.
The dry capacitor core 3 of the present embodiment may be made of glue-impregnated glass fiber insulation or glue-impregnated paper insulation. The auxiliary insulation 9 adopts insulating paste, insulating glue, insulating oil or SF6A gas.
The cable terminal of the embodiment is a capacitive solid main insulation structure, all components are prefabricated in a factory, and factory pre-installation can be carried out through experiments. Therefore, the product has simple site construction, safe and reliable operation, no porcelain, no explosion, no maintenance and no environmental pollution, and meets the use requirements of ultrahigh pressure and extra-high voltage.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A fully-prefabricated dry-type capacitive cable terminal is characterized by comprising a wiring terminal (1), a cable lead connector (2), a dry-type capacitor core (3), an increasing-climbing umbrella skirt (4), an upper connecting flange (5), a lower connecting flange (6), a grounding terminal (7), a cable sealing box (8), auxiliary insulation (9), a supporting insulator (10), a cable (11), an upper cover plate (12), a lower cover plate (13) and a rain cover (14), wherein the upper end and the lower end of the dry-type capacitor core (3) are respectively connected with the upper connecting flange (5) and the lower connecting flange (6) in a sealing way, the increasing-climbing umbrella skirt (4) is arranged on the outer surface of the dry-type capacitor core (3), the cable (11) is led in from the center of the dry-type capacitor core (3) and connected with the cable lead connector (2), the upper connecting flange (5) and the upper cover plate (12) are fixedly connected with the cable lead connector (2), the lower connecting flange (6) is fixed with the lower cover plate (13) through bolts, the lower cover plate (13) is connected with a cable (11) through a cable sealing box (8) in a sealing mode, the grounding terminal (7) is fixed on the lower connecting flange (6) in a sealing mode, the grounding terminal (7) is further connected with a cable shielding layer (11-2) and a dry-type capacitor core (3), a supporting insulator (10) is fixed on the lower cover plate (13), auxiliary insulation (9) is filled between the cable (11) and the dry-type capacitor core (3), a rain cover (14) is connected with an upper connecting flange (5) and a cable lead connector (2) in a sealing mode, and a wiring terminal (1) is fixed on the cable lead connector (2).
2. The fully prefabricated dry capacitor type cable termination according to claim 1, wherein the dry capacitor core (3) is made of an adhesive-impregnated fiberglass insulation or an adhesive-impregnated paper insulation.
3. A fully prefabricated dry capacitive cable termination according to claim 1, characterized in that the lower cover plate (13) is fixedly connected to the cable termination frame by means of support insulators (10).
4. The fully-prefabricated dry capacitor type cable termination according to claim 1, wherein the dry capacitor core (3) is made of an adhesive-impregnated fiberglass insulation or an adhesive-impregnated paper insulation.
5. -an all-prefabricated dry-capacitive cable termination according to claim 1, characterized in that the auxiliary insulation (9) is made of insulating paste, oil or SF6A gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020316025.3U CN211556826U (en) | 2020-03-15 | 2020-03-15 | Fully prefabricated dry-type capacitive cable terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020316025.3U CN211556826U (en) | 2020-03-15 | 2020-03-15 | Fully prefabricated dry-type capacitive cable terminal |
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| CN211556826U true CN211556826U (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466582A (en) * | 2020-11-30 | 2021-03-09 | 江西百新电瓷电气有限公司 | Porcelain insulator for subway tunnel and manufacturing process thereof |
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2020
- 2020-03-15 CN CN202020316025.3U patent/CN211556826U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466582A (en) * | 2020-11-30 | 2021-03-09 | 江西百新电瓷电气有限公司 | Porcelain insulator for subway tunnel and manufacturing process thereof |
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