CN110112695A - It is a kind of suitable for 35kV and the joint structure of following mesolow cable - Google Patents

Abstract

The invention discloses a joint structure of a cable, comprising a connecting pipe, a wrapping layer group, a first prefabricated part and a second prefabricated part, including a connecting pipe, a wrapping layer group, a first prefabricated part and a second prefabricated part, the first prefabricated part A prefabricated part set is fixed on the outside of the first shielding break and the first transition slope, the second prefabricated part set is fixed on the outside of the second shielding break and the second transition slope, and one end of the connecting pipe is set on the first cable of the first cable. The outer side of the connecting conductor, the other end of the connecting pipe is sleeved on the outer side of the second connecting conductor of the second cable, the first connecting conductor and the second connecting conductor are crimped and fixed by the connecting pipe, and the wrapping layer group is wrapped on the outer side of the connecting pipe, and The wrapping group extends from a side of the first preform away from the connecting pipe to a side of the second preform away from the connecting pipe. The joint has a simple structure, is convenient for construction and operation, and can improve the efficiency of cable connection. Setting the first prefabricated part and the second prefabricated part can effectively even out the electric field, ensure electrical performance, ensure the stability of the cable connection, and make the transmission of electric energy stable and efficient. conduct.

Description

A joint structure suitable for medium and low voltage cables of 35kV and below

technical field

The invention relates to the technical field of cable connection, in particular to a joint structure suitable for medium and low voltage cables of 35kV and below.

Background technique

With the development of the economy and the continuous advancement of science and technology, people's lives are becoming more and more convenient. As a clean energy, electric energy has been widely used by people. The transmission of electric energy is generally realized by cables. However, since the cables are produced in a standardized manner and their lengths are fixed, the cables need to be connected and extended in order to meet the requirements of electric energy transmission. When the cables are connected and extended, two cables need to be connected. The power cable intermediate joint is an important part that connects two cables, and together with the cable, it forms a power transmission line. Theoretically, the cable intermediate joint should be able to run safely for a long time like the cable body, and have the same service life as the cable. However, in actual operation, compared with the cable body, the cable intermediate joint is a weak link, and most of the cable line faults occur here. Therefore, a good cable intermediate joint is very important in the safe and reliable operation of power equipment and safe power supply. A little carelessness will cause failure, and sometimes even cause large-scale power outages.

In the prior art, the joint structures for butt joints of medium and low voltage cables of 35kV and below include heat shrinkable, cold shrinkable and wrapping types. Cold-shrinkable joints, that is, after the conductor connecting tubes are crimped to the cable core wires at both ends, the cold-shrinkable sheath tubes or outer insulating tapes are covered; the wrap-around joints include wire cores, conductor connecting tubes, inner semi-conductive layers, and main insulation. , outer semi-conductive layer, copper shielding layer, and outer sheath. After the conductor connecting tube is crimped to the cable core wires at both ends, the outer layer is wrapped with special electrical semiconductor self-adhesive tape and insulating self-adhesive tape. Among them, the cable joints with heat-shrinkable and cold-shrinkable structures have a high failure rate, which has a great impact on the safety and stability of line operation. Creepage on the insulating surface eventually leads to breakdown of the intermediate joint. The cable joint with wrapping structure has disadvantages such as complex structure, high cost, high technical requirements for construction personnel and low mechanical strength, which is not conducive to the use in cable connection.

Contents of the invention

The object of the present invention is to solve at least one of the above existing problems, and the object is achieved through the following technical solutions.

The present invention provides a cable joint structure, comprising a connecting pipe, a wrapping layer group, a first prefabricated part and a second prefabricated part, the first prefabricated part is set and fixed on the outside of the first shielding fracture and the first transition slope, The second prefabricated component set is fixed on the outside of the second shielding break and the second transition slope, one end of the connecting pipe is set on the outside of the first connecting conductor of the first cable, and the other end of the connecting pipe is set on the outside of the second cable The outer side of the second connecting conductor, the first connecting conductor and the second connecting conductor are crimped and fixed by the connecting tube, and the wrapping layer group is wrapped around the connecting tube, the first insulating layer and the second insulating layer , the first preform and the second preform, the outer sides of the first cable and the second cable.

Optionally, the set of wrapping layers includes a first semiconductive tape layer, and the first semiconductive tape layer is wrapped around the outer side of the connecting pipe.

Optionally, the set of wrapping layers further includes an insulating tape layer, the insulating tape layer is wrapped around the outer side of the semi-conductive tape layer, and the insulating tape layer is away from the first preform One side extends toward a side of the first preform away from the connecting pipe.

Optionally, the set of wrapping layers further includes a second semiconductive tape layer, the second semiconductive tape layer is wrapped on the outside of the insulating tape layer, and the second semiconductive tape layer is separated from the first semiconductive tape layer. A shielding layer extends toward the second shielding layer.

Optionally, the set of wrapping layers further includes a first waterproof tape layer, and the first waterproof tape layer is wrapped on the outside of the connection end between the second semiconductive tape layer and the first cable.

Optionally, the set of wrapping layers further includes a second waterproof tape layer, and the second waterproof tape layer is wrapped on the outside of the connection end between the second semiconductive tape layer and the second cable.

Optionally, the group of wrapping layers further includes a copper mesh layer, the copper mesh layer is wrapped on the outside of the second semi-conductive tape layer, and one end of the copper mesh layer is wrapped on the outside of the first shielding layer , the other end of the copper mesh layer is wrapped on the outside of the second shielding layer.

Optionally, the group of wrapping layers further includes a third waterproof tape layer, the third waterproof tape layer is wrapped on the outside of the copper mesh layer, and one end of the copper mesh layer is wrapped on the first cable of the first cable. The outer side of the protective sheath, the other end of the copper mesh layer is wrapped on the outer side of the second protective sheath of the second cable.

Optionally, the set of wrapping layers further includes an armor tape layer, and the armor tape layer is wrapped on the outside of the third waterproof tape layer.

Optionally, the first transition slope or the second transition slope is a slope transition section on the first or second shielding layer from the first or second shielding fracture to the left or right.

The joint structure of the cable provided by the present invention includes a connecting pipe, a first prefabricated part, a second prefabricated part, and a wrapping layer group. Specifically, when performing cable connection, it is necessary to separately process the connecting end of the first cable and the connecting end of the second cable, wherein part of the first connecting conductor and part of the first shielding layer leak out from the connecting end of the first cable, and the second Part of the second connecting conductor and part of the second shielding layer leak out from the connection end of the second cable, and the first prefabricated component is fixed on the outside of the first shielding fracture and the first transition slope, and the second prefabricated component is fixed on the second shielding fracture and the outer side of the first transition slope. On the outside of the second transition slope, insert the first connecting conductor from one end of the connecting pipe, and insert the second connecting conductor from the other end of the connecting pipe, so that the first connecting conductor and the second connecting conductor fit together in the connecting pipe, and use pressure The connection tool is used to crimp the connecting pipe, so that the first connecting conductor and the second connecting conductor are fixed in the connecting pipe, and finally wrap the wrapping layer group on the connecting end of the first prefabricated part, the connecting pipe, the second prefabricated part and the first cable and the outside of the connection end of the second cable, so that the connection position of the first cable and the second cable is wrapped and isolated to form a joint structure of the first cable and the second cable.

The structure of the cable joint of the present invention is simple, and its prefabricated part replaces part of the tape wrapping, which has relatively low requirements on the installation environment, personnel and process on site, facilitates construction operations during the cable connection process, and can effectively improve the cable connection efficiency. At the same time, by setting the first prefabricated part and the second prefabricated part to cooperate with the wrapping layer group, the strength of the cable connection position can be effectively improved after the wrapping layer group is wrapped, thereby ensuring the stability of the cable connection and making the electric energy The transmission is carried out stably and efficiently.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the sectional view of the joint structure of the cable provided by the present invention;

Fig. 2 is a cross-sectional view of the structure of the first cable provided by the present invention.

reference sign

10 is the first cable, 104 is the first connecting conductor, 102 is the first insulating layer, 103 is the first shielding layer, 101 is the first transition slope (that is, on the first shielding layer, from the first shielding fracture to the left slope transition section), 105 is the first shielding fracture; 20 is the second cable, 204 is the second connecting conductor, 202 is the second insulating layer, 203 is the second shielding layer, and 201 is the second transition slope (that is, in the second On the shielding layer, the slope transition section from the second shielding fracture to the right), 205 is the second shielding fracture;

1 is the first prefab;

2 is the second prefab;

3 for taking over;

4 is the wrapping layer group, 41 is the first semiconductive tape layer, 42 is the insulating tape layer, 43 is the second semiconductive tape layer, 44 is the first waterproof tape layer, 45 is the second waterproof tape layer, and 46 is copper Net layer, 47 is the third waterproof tape layer, and 48 is the armor tape layer.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

Please refer to FIG. 1 , in a specific embodiment, the present invention provides a cable joint structure, including a connecting pipe 3 , a wrapping layer group 4 , a first prefabricated part 1 and a second prefabricated part 2 . The first prefabricated part 1 is set and fixed on the outside of the first transition slope 101 of the first shielding layer 103 and the first shielding break 105 of the first cable 10, and the second prefabricated part 2 is set and fixed on the outer side of the second cable 20, the second The second excessive slope 201 of the shielding layer 203 and the outside of the second shielding break 205; one end of the connecting pipe 3 is sleeved on the outside of the first connecting conductor 102 of the first cable 10, and the other end of the connecting pipe 3 is sleeved on the second connecting conductor 102 of the second cable 20. The outer side of the two connecting conductors 202, the first connecting conductor 102 and the second connecting conductor 202 are attached to the inside of the connecting pipe 3, the wrapping layer group 4 is wrapped on the outside of the connecting pipe 3, and the wrapping layer group 4 is formed from the first preform 1 extends from the side away from the connecting pipe 3 to the side of the second preform 2 away from the connecting pipe 3 .

Specifically, when performing cable docking, it is necessary to separately process the connection end of the first cable 10 and the connection end of the second cable 20 . Wherein, the connecting end of the first cable 10 leaks part of the first connecting conductor 102 and part of the first shielding layer 103, and the connecting end of the second cable 20 leaks part of the second connecting conductor 202 and part of the second shielding layer 203, so that the first shielding layer The layer 103 and the second shielding layer 203 are processed with a slope to the left or right from the shielding fracture 105 or the shielding fracture 205 respectively, that is, the first transitional gradient 101 and the second transitional gradient 201; the first prefabricated part 1 is set in The first transitional slope 101 of the first shielding layer 103 and the outside of the first shielding fracture 105, the second preform 2 is set on the second transitional gradient 201 of the second shielding layer 203 and the outside of the second shielding fracture 205, and then the first A connecting conductor 102 is inserted from one end of the connecting pipe 3, and a second connecting conductor 202 is inserted from the other end of the connecting pipe 3, so that the first connecting conductor 102 and the second connecting conductor 202 fit together in the connecting pipe 3, and a crimping tool is used to couple The connecting pipe 3 is crimped so that the first connecting conductor 102 and the second connecting conductor 202 are fixed in the connecting pipe 3, and finally the wrapping layer group 4 is wrapped around the first prefabricated part 1, the connecting pipe 3, the second prefabricated part 2, the second prefabricated part The outside of the connecting end of the first cable 10 and the connecting end of the second cable 20 , so as to isolate the connecting position of the first cable 10 and the second cable 20 so as to form the joint structure of the first cable 10 and the second cable 20 .

The joint structure of the above-mentioned cables is simple, especially the design of the shielding fracture and the transition slope, which makes the joint structure transition smoothly, the prefabricated parts are convenient to insert, facilitate the construction operation during the cable wiring process, and can effectively improve the efficiency of cable connection. At the same time, by setting After the first prefabricated part 1 and the second prefabricated part 2 are wrapped around the cladding layer group 4, the strength of the cable connection position can be effectively improved, so as to ensure the stability of the cable connection and make the transmission of electric energy stable and efficient.

It should be pointed out that the first prefabricated part 1 is a semiconductor part, and its shape is an ellipsoidal structure. A first installation hole is opened on the first prefabricated part 1. By inserting the first cable 10 into the first installation hole, and The first transitional slope 101 is clamped in the first mounting hole; the second prefabricated part 2 is a semiconductor part, and the second prefabricated part 2 is an ellipsoidal structure, and a second mounting hole is opened on the second prefabricated part 2, through Insert the second cable 20 into the second installation hole, and make the second transitional slope 201 snap into the second installation hole. When wrapping the wrapping layer group 4, one end of the wrapping layer group 4 is drawn from the first prefabricated part 1 starts from the side away from the first joint, and the other end of the wrapping layer group 4 extends to the side of the second preform 2 away from the second joint, that is to say, the wrapping layer group 4 wraps the first preform 1 and the first preform 2 respectively. The second prefabricated part 2 is completely wrapped, and one end around the cladding group 4 extends to the inside of the length of the first cable 10, and the other end around the cladding group 4 extends to the inside of the length of the second cable 20, thereby effectively ensuring the joint of the cables Stability and safety of the structure.

It is further understood that the wrapping layer set 4 includes a first semiconductive tape layer 41 , and the first semiconductive tape layer 41 is wrapped around the outside of the connecting pipe 3 . After the first connecting conductor 102 and the second connecting conductor 202 are respectively plugged and fixed inside the connecting pipe 3, the first semiconducting tape is wrapped on the outside of the connecting pipe 3. The other end is wound, and a certain thickness is wound in the radial direction of the connecting pipe 3, thereby forming the first semi-conductive tape layer 41, so that the connecting pipe 3 is isolated from the outside world, and the magnetic field at the cable connection is balanced to improve the stability and safety of the cable connection sex.

Further, the wrapping layer group 4 also includes an insulating tape layer 42, the insulating tape layer 42 is wrapped on the outside of the semi-conductive tape layer, and the insulating tape layer 42 faces the first preform from the side of the first preform 1 away from the connecting pipe 3 1 extends away from the side of the connecting pipe 3. After the first semiconductive tape is wrapped to form the first semiconductive tape layer 41, the insulating tape is wrapped to form the insulating tape layer 42. When the insulating tape is wrapped, the insulating tape is far away from the first preform 1 One side of a joint begins to wrap around the side of the second prefabricated part 2 away from the second joint, and wraps a certain thickness in the radial direction of the connecting pipe 3, thereby forming an insulating tape layer 42, thereby ensuring good insulation of the cable joint Effect.

It should be pointed out that the above-mentioned insulating tape is a self-adhesive tape with rubber as the base material, so as to facilitate the use in on-site construction and form the stability of the insulating layer.

Further, the wrapping layer group 4 also includes a second semiconductive tape layer 43, the second semiconductive tape layer 43 is wrapped on the outside of the insulating tape layer 42, and the second semiconductive tape layer 43 extends from the first shielding layer 103 to the first The second shielding layer 203 extends. After the wrapping of the insulating tape layer 42 is completed, a second semiconductive tape is wrapped outside the insulating tape layer 42 to form the second semiconductive tape layer 43 . The second semiconductive tape layer 43 wraps from the end of the insulating tape layer 42 located at the first cable 10 to the end of the insulating tape located at the second cable 20, and has a certain thickness in the radial direction of the connecting pipe 3, so as to form a second half Conductive belt layer 43 . The connection position between the second semiconducting tape layer 43 and the first cable 10 forms a first closing structure, and the connecting position between the second semiconducting tape layer 43 and the second cable 20 forms a second closing structure, through which the second semiconducting tape layer 43 On the one hand, it can effectively isolate the connection positions of the first cable 10 and the second cable 20, and at the same time, the second semiconducting tape layer 43 can balance the magnetic field at the cable connection, improving the stability and safety of the cable connection.

Further, the wrapping layer set 4 also includes a first waterproof tape layer 44 , and the first waterproof tape layer 44 is wrapped on the outside of the connection end between the second semiconductive tape layer 43 and the first cable 10 . The first waterproof tape is wrapped around the connection end of the second semiconductive tape layer 43 and the first cable 10, and has a certain thickness, thereby forming the first waterproof tape layer 44, and the cable connection is realized by setting the first waterproof tape layer 44 The internal and external isolation of the position avoids the influence of external environmental factors on the cable connection position, thereby ensuring the safety of the cable connection position and the safety during use.

Further, the wrapping layer set 4 also includes a second waterproof tape layer 45 , and the second waterproof tape layer 45 is wrapped on the outside of the connection end between the second semiconductive tape layer 43 and the second cable 20 . The second waterproof tape is wrapped around the connection end of the second semiconductive tape layer 43 and the second cable 20, and has a certain thickness, thereby forming the second waterproof tape layer 45, and the cable wiring is realized by setting the second waterproof tape layer 45 The internal and external isolation of the position avoids the influence of external environmental factors on the cable connection position, thereby ensuring the safety of the cable connection position and the safety during use.

It is specifically understood that the wrapping layer group 4 also includes a copper mesh layer 46, the copper mesh layer 46 is wrapped on the outside of the second semi-conductive tape layer 43, and one end of the copper mesh layer 46 is wrapped on the outside of the first shielding layer 101, The other end of the copper mesh layer 46 is wrapped around the outside of the second shielding layer 201 . The first waterproof tape layer 44, the second semi-conductive tape layer 43 and the second waterproof layer are wrapped inside by the copper mesh layer 46, while one end of the copper mesh layer 46 is wrapped on the outside of the first shielding layer 101, and the copper mesh layer 46 The other end of the second shielding layer 201 is wrapped on the outside of the second shielding layer 201. On the one hand, the setting of the copper mesh layer 46 can increase the strength of the cable joint position, thereby improving the stability of the cable joint. On the other hand, it can realize the shielding of the cable joint position. , so that the magnetic field at the cable joint position is more uniform, so that the safety of use is guaranteed.

Specifically, the wrapping layer group 4 also includes a third waterproof tape layer 47, the third waterproof tape layer 47 is wrapped on the outside of the copper mesh layer 46, and one end of the copper mesh layer 46 is wrapped in the first protective sheath 103 of the first cable 10 The other end of the copper mesh layer 46 is wrapped on the outside of the second protective sheath 23 of the second cable 20 . Through the above structure, the third waterproof belt layer 47 can be used to waterproof and isolate the structure inside the cable joint from the outside world, so as to ensure the safety of the cable connection position and further ensure the effective transmission of electric energy.

Specifically, the wrapping layer set 4 further includes an armor tape layer 48 , and the armor tape layer 48 is wrapped on the outside of the third waterproof tape layer 47 . The mechanical protection of the cable joint can be realized by setting the armored tape layer 48, and the impact of the external environment on the position of the cable joint can be avoided, so as to ensure the strength and stability of the position of the cable joint, and thus ensure the effective transmission of electric energy.

It will be understood that although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or The comparison should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A joint structure suitable for medium and low-voltage cables of 35kV and below, characterized in that it includes a connecting pipe, a wrapping layer group, a first prefabricated part and a second prefabricated part, and the first prefabricated part is set and fixed on the first shielding The outer side of the fracture and the first transitional slope, the second prefabricated part is set and fixed on the second shielding fracture and the outer side of the second transitional slope, one end of the connecting pipe is sleeved on the outer side of the first connecting conductor of the first cable, the The other end of the connecting pipe is sleeved on the outside of the second connecting conductor of the second cable, the first connecting conductor and the second connecting conductor are crimped and fixed through the connecting pipe, and the wrapping layer group is wrapped around the connecting pipe, The first and second insulation layers, the first and second preforms, the outer sides of said first and second cables. 2 . The cable joint structure according to claim 1 , wherein the set of wrapping layers comprises a first semiconductive tape layer. 3 . 3 . The cable joint structure according to claim 2 , wherein the set of wrapping layers further comprises an insulating tape layer, and the insulating tape layer is wrapped around the outer side of the semiconducting tape layer. 4 . 4. The cable joint structure according to claim 3, characterized in that, the set of wrapping layers further comprises a second semiconductive tape layer, and the second semiconductive tape layer is wrapped on the outer side of the insulating tape layer . 5. The joint structure of the cable according to claim 4, wherein the group of wrapping layers further comprises a first waterproof tape layer, and the first waterproof tape layer is wrapped between the second semiconductive tape layer and the second semiconductive tape layer. the outer side of the connecting end of the first cable. 6. The joint structure of the cable according to claim 5, wherein the group of wrapping layers further comprises a second waterproof tape layer wrapped between the second semiconductive tape layer and the second waterproof tape layer. the outside of the connection end of the second cable. 7. The joint structure of the cable according to claim 6, wherein the group of wrapping layers further comprises a copper mesh layer, and the copper mesh layer is wrapped on the outside of the second semiconducting tape layer, and the One end of the copper mesh layer is wrapped on the outside of the first shielding layer, and the other end of the copper mesh layer is wrapped on the outside of the second shielding layer. 8. The cable joint structure according to claim 7, wherein the wrapping layer group further comprises a third waterproof tape layer, and the third waterproof tape layer is wrapped on the outer side of the copper mesh layer, so that One end of the copper mesh layer is wrapped on the outside of the first protective sheath of the first cable, and the other end of the copper mesh layer is wrapped on the outside of the second protective sheath of the second cable. 9 . The cable joint structure according to claim 8 , wherein the set of wrapping layers further comprises an armor tape layer, and the armor tape layer is wrapped on the outside of the third waterproof tape layer. 10 . 10. The cable joint structure according to claim 1, characterized in that, the first transition slope or the second transition slope is on the first or second shielding layer, from the first or second shielding fracture to the left or the slope transition to the right.