CN210927054U - Novel indoor and outdoor terminal of high-voltage power cable - Google Patents
Novel indoor and outdoor terminal of high-voltage power cable Download PDFInfo
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- CN210927054U CN210927054U CN201921244691.4U CN201921244691U CN210927054U CN 210927054 U CN210927054 U CN 210927054U CN 201921244691 U CN201921244691 U CN 201921244691U CN 210927054 U CN210927054 U CN 210927054U
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- voltage power
- high voltage
- cable
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Abstract
The utility model discloses a novel high voltage power cable's indoor outer terminal, the utility model discloses well insulating overcoat is including the insulating core that has the electric capacity screen and locating the outer insulating cover body in the insulating core outside, insulating core adopts to glue and soaks the paper sleeve pipe or glue and soaks the fiber sleeve pipe, forms an even coaxial electrode between the cable conductor in electric capacity screen in the insulating core and the power cable. Compared with the traditional structure, the utility model saves the stress cone sleeved on the cable and a large amount of insulating oil inside, and has the characteristics of simple and convenient field operation, excellent electrical performance and high operational reliability; especially, the oil-free characteristic of the cable is that even if an insulation fault occurs, the cable does not cause vicious accidents such as explosion and combustion, and is more suitable for being used in cities.
Description
The technical field is as follows:
the utility model relates to a power transmission and distribution equipment, more specifically are high voltage power cable's indoor outer terminal, are applicable to 110kV and above novel high voltage power cable's indoor outer terminal.
Background art:
currently, indoor and outdoor terminals of high-voltage power cables are widely used in urban power transmission and distribution systems to connect the high-voltage power cables with overhead lines.
Referring to fig. 4 and 5, in the conventional indoor and outdoor terminals of the high voltage power cable, because the power lines at the insulation shielding cut-off portion of the high voltage power cable are concentrated, the general solution of the high voltage power cable of 110kV and above is to use a flared tube made of a semi-conductive material to improve the electric field distribution at the insulation shielding cut-off portion of the cable, and the structural form of the flared tube is consistent with the principle of an outlet sleeve for GIS.
The insulating medium inside the GIS outlet sleeve is SF6 gas, which has good insulating property, so the structure basically meets the electrical requirement. However, the internal insulation medium of the conventional cable termination is generally not suitable for SF6 gas, but only liquid insulation material such as transformer oil or silicone grease, which has poor insulation performance compared with SF6 gas, so that the cable termination adopts a method of sleeving a stress cone on a high-voltage power cable to improve electric field distribution.
Although the electric field distribution is improved by the method, the effect on products with high voltage levels, particularly 330kV and above, is still not obvious. This is also demonstrated by the extensive experimental results and practical operation. Some cable terminations are subject to cracking of the insulating oil (transformer oil) due to long term partial discharges at the stress cone, resulting in explosion of the entire cable termination.
The invention content is as follows:
the utility model relates to a solve the problem that above-mentioned prior art exists and provide a novel high voltage power cable's indoor outer terminal.
The utility model discloses the technical scheme who adopts has: the utility model provides a novel high voltage power cable's indoor outer terminal, indoor outer terminal is used for connecting high voltage power cable and overhead line, including binding post, the fastener of being qualified for the next round of competitions, insulating overcoat, bottom plate, pillar insulator and ground cover, the top of insulating overcoat with be qualified for the next round of competitions fastener and binding post link to each other, and the inside of insulating overcoat is arranged in to the fastener of being qualified for the next round of competitions, the bottom of insulating overcoat links to each other with the bottom plate, pillar insulator and ground cover are connected on the bottom plate, binding post is connected with the overhead line, insulating overcoat is including having the insulating core of electric capacity screen and locating the outer insulation cover body in the insulating core outside, the insulating core adopts to glue and soaks the paper sleeve or glue and soaks the fiber sleeve, forms an even coaxial electrode between the cable conductor.
Furthermore, the cross section of the capacitive screen is of a step-shaped parallelogram structure.
Furthermore, the insulating outer sleeve is provided with a mounting flange, a zero screen of the capacitive screen is connected with a cable conductor in the power cable, and a tail screen of the capacitive screen is connected with the mounting flange.
Further, the outer surface of the outer insulating sleeve body is injected or sleeved with a silicon rubber umbrella skirt.
Further, a porcelain bushing or a composite insulating cylinder is mounted on the outer surface of the outer insulating sleeve body.
Furthermore, a measuring terminal is arranged on the outer wall of the insulating outer sleeve.
Furthermore, a voltage-sharing cover is arranged at the top end of the insulating outer sleeve.
Furthermore, the inner part of the outer insulating sleeve body in the insulating outer sleeve is filled with insulating medium.
The utility model discloses following beneficial effect has:
compared with the traditional structure, the utility model saves the stress cone sleeved on the cable and a large amount of insulating oil inside, and has the characteristics of simple and convenient field operation, excellent electrical performance and high operational reliability; especially, the oil-free characteristic of the cable is that even if an insulation fault occurs, the cable does not cause vicious accidents such as explosion and combustion, and is more suitable for being used in cities.
Description of the drawings:
fig. 1 is a structural diagram of the present invention.
Fig. 2 is a structural diagram of the middle capacitive screen of the present invention.
Fig. 3 is a zoom view of the middle capacitive screen of the present invention.
Fig. 4 is a schematic diagram of an outlet sleeve structure in the prior art.
Fig. 5 is a schematic diagram of a structure of a prior art indoor and outdoor terminal.
The specific implementation mode is as follows:
the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to a novel high voltage power cable's indoor outer terminal, indoor outer terminal are used for connecting high voltage power cable and overhead line, including binding post 1, the fastener 3 of being qualified for the next round of competitions, insulating overcoat 4, bottom plate 8, post insulator 9 and ground cover 10, the top of insulating overcoat 4 links to each other with the fastener 3 of being qualified for the next round of competitions and binding post 1, and the inside of insulating overcoat 4 is arranged in to the fastener 3 of being qualified for the next round of competitions, and the bottom of insulating overcoat 4 links to each other with bottom plate 8, and post insulator 9 and ground cover 10 are connected on bottom plate 8, and binding.
The insulating outer sleeve 4 comprises an insulating core with a capacitive screen 6 and an outer insulating sleeve body 41 arranged on the outer side of the insulating core, and the insulating core is made of a glue-impregnated paper sleeve (RIP) or a glue-impregnated fiber sleeve (RIF) (or made of other solid insulating sleeves). A uniform coaxial electrode is formed between the capacitive screen 6 in the insulating core and the cable conductor in the power cable.
Referring to fig. 2 and 3, the cross section of the capacitive screen 6 is a step-like parallelogram structure.
And the insulating outer sleeve 4 is provided with a mounting flange, a zero screen of the capacitance screen 6 is connected with a cable conductor in the power cable, and a tail screen of the capacitance screen 6 is connected with the mounting flange. There is a small gap between the inner diameter of the outer insulating sleeve 41 and the outer diameter of the cable with the outer sheath and the ground shielding net peeled off, and the gap is vacuumized and filled with insulating paste or other insulating materials after the product is assembled and sealed.
The outer surface of the outer insulating sleeve 41 is injected or sleeved with a silicon rubber shed. Alternatively, a porcelain bushing or a composite insulating cylinder is mounted on the outer surface of the outer insulating sleeve body 41.
In order to meet the requirement of intelligent operation of a power grid, the insulating outer sleeve 4 can also be provided with a measuring terminal 7 for partial discharge of a detection product or on-line monitoring.
The top end of the insulating outer sleeve 4 is provided with a voltage-sharing cover 2, and the voltage-sharing cover 2 improves the top electric field.
The inside of the outer insulating jacket body 41 in the insulating jacket 4 is filled with an insulating medium 5.
The utility model discloses an aim at on the basis of above-mentioned background art, with the innovative thinking of striding the field, design and produce the cable termination of a novel structure, greatly improve its operational reliability, thoroughly solve above-mentioned problem.
The purpose of the utility model is realized through the following technical scheme:
1) the utility model discloses an utilize the principle of the even electric field of electric capacity, replaced original insulating overcoat with glue that has the electric capacity screen and soaked paper sleeve pipe (RIP) or glass steel sleeve pipe (RIF). The end screen of the sheathed tube electric capacity screen is connected with mounting flange and ground connection shielding net on the overcoat, form an even coaxial electrode between end screen and the cable conductor, shield mounting flange and cable ground connection shielding net outside the electric field, the electric capacity of every electrode is the same basically, according to the principle of equal capacitance design, form the parallelogram structure of step form inside and outside, because the effect of the even partial pressure of electric capacity, the voltage-sharing is forced owing to the effect of electric capacity along the external insulation of overcoat and along the internal insulation of the cable insulation outside surface voltage, formed the voltage distribution of basic even, improved insulating properties.
2) The main insulation of the capacitive screen is a solid insulator, which can be a glue-impregnated paper bushing (RIP) of epoxy resin impregnated insulation paper, a glass fiber reinforced plastic bushing (RIF) wound by glass fiber, or even a casting body of other insulation materials.
3) The outer sleeve of the solid insulator of the capacitive screen can be directly injected or sleeved with a silicon rubber umbrella skirt, and can also be additionally provided with a porcelain sleeve or a composite insulating cylinder and the like as external insulation.
4) The cable with the outer skin and the grounding shielding net peeled off passes through the inner hole of the sleeve, a small gap is arranged between the inner hole and the outer hole, the gap is vacuumized and injected with insulating paste after the product is assembled and sealed, and the paste has good electrical performance, is not easy to leak and can not be combusted and exploded.
5) In the indoor and outdoor terminals with the traditional structure, the internal electric field is uniform by adopting a larger stress cone, so that the inner diameter of the insulating outer sleeve is larger and the weight is heavier; the utility model discloses a owing to adopted the insulating overcoat of electrified appearance screen, its good even electric field distribution and good insulating properties, its compact structure, the size is also less, therefore whole light in weight is convenient for transport and installation.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a novel high voltage power cable's indoor outer terminal, indoor outer terminal is used for connecting high voltage power cable and overhead line, include binding post (1), the fastener (3) of being qualified for the next round of competitions, insulating overcoat (4), bottom plate (8), post insulator (9) and ground connection cover (10), the top of insulating overcoat (4) links to each other with the fastener (3) of being qualified for the next round of competitions and binding post (1), and the inside of insulating overcoat (4) is arranged in to the fastener (3) of being qualified for the next round of competitions, and the bottom of insulating overcoat (4) links to each other with bottom plate (8), and post insulator (9) and ground connection cover (10) are connected on bottom plate (8), binding post (1) are connected with the overhead line: the insulating outer sleeve (4) comprises an insulating core with a capacitive screen (6) and an outer insulating sleeve body (41) arranged on the outer side of the insulating core, the insulating core is a glue-impregnated paper sleeve or a glue-impregnated fiber sleeve, and an even coaxial electrode is formed between the capacitive screen (6) in the insulating core and a cable conductor in the power cable.
2. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: the cross section of the capacitive screen (6) is of a step-shaped parallelogram structure.
3. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: and the insulating outer sleeve (4) is provided with a mounting flange, a zero screen of the capacitance screen (6) is connected with a cable conductor in the power cable, and a tail screen of the capacitance screen (6) is connected with the mounting flange.
4. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: the outer surface of the outer insulating sleeve body (41) is injected or sleeved with a silicon rubber umbrella skirt.
5. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: and a porcelain bushing or a composite insulating cylinder is arranged on the outer surface of the outer insulating bushing body (41).
6. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: and a measuring terminal (7) is arranged on the outer wall of the insulating outer sleeve (4).
7. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: and the top end of the insulating outer sleeve (4) is provided with a voltage-sharing cover (2).
8. The new indoor and outdoor termination of high voltage power cable as claimed in claim 1, wherein: and an insulating medium (5) is filled in the inner part of the outer insulating sleeve body (41) in the insulating outer sleeve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921244691.4U CN210927054U (en) | 2019-08-02 | 2019-08-02 | Novel indoor and outdoor terminal of high-voltage power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921244691.4U CN210927054U (en) | 2019-08-02 | 2019-08-02 | Novel indoor and outdoor terminal of high-voltage power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210927054U true CN210927054U (en) | 2020-07-03 |
Family
ID=71365536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921244691.4U Expired - Fee Related CN210927054U (en) | 2019-08-02 | 2019-08-02 | Novel indoor and outdoor terminal of high-voltage power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210927054U (en) |
-
2019
- 2019-08-02 CN CN201921244691.4U patent/CN210927054U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200703 Termination date: 20210802 |
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| CF01 | Termination of patent right due to non-payment of annual fee |