Dry prefabricated terminal

Abstract

The invention discloses a dry-type prefabricated terminal which comprises a cable end and a dry-type prefabricated terminal body wrapping the cable end, the cable end comprises a wire core and an insulating layer wrapping the wire core, and the end portion of the cable end is provided with a semi-conductive step; the dry-type prefabricated terminal body comprises a stress cone sleeve and a porcelain outer sleeve wrapping the stress cone sleeve. The stress cone sleeve and the porcelain outer sleeve are each of a hollow containing structure with openings formed in the two ends. The stress cone sleeve comprises a first containing cavity, a second containing cavity connected with the first containing cavity and a third containing cavity connected with the second containing cavity, and a first inner hole step is arranged at the connecting position of the first containing cavity and the second containing cavity. By implementing the dry prefabricated terminal disclosed by the invention, the damage caused by long-term exposure of the terminal in a seriously polluted environment can be effectively prevented, and the service life is prolonged; the structure is reasonable and the cost is easy to control.

Description

Technical Field

[0001] The invention relates to the technical field of medium and low voltage equipment, and in particular to a dry prefabricated terminal. Background Art

[0002] In the prior art, cable accessories usually use heat shrink terminals with multiphase polymer as the main material and cold shrink terminals with silicone rubber as the main material, but heat shrink materials with multiphase polymer as the main material and cold shrink materials with silicone rubber as the main material do not have anti-pollution performance. For example, using cable accessories in places with serious pollution such as seaside, mines, petroleum, and chemical industries, such as dust, salt spray, acidity and alkalinity, can easily cause problems such as corrosion and creepage on the outer surface of the terminal body, and there are safety hazards such as breakdown of the terminal body and power outage accidents. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a dry prefabricated terminal, which can effectively prevent the terminal from being damaged by long-term exposure to a severely polluted environment and prolong its service life; the structure is reasonable and the cost is easy to control.

[0004] In order to solve the above technical problems, the present invention provides a dry prefabricated terminal, comprising: a cable end and a dry prefabricated terminal body coated on the outside of the cable end, the cable end comprising: a wire core and an insulating layer coated on the outside of the wire core, and a semi-conductive step is arranged at the end of the cable end; the dry prefabricated terminal body comprises: a stress cone sleeve and a porcelain jacket coated on the outside of the stress cone sleeve, the stress cone sleeve and the porcelain jacket are respectively hollow accommodating structures with openings at both ends; the stress cone sleeve comprises: a first accommodating chamber, a second accommodating chamber connected to the first accommodating chamber, and a third accommodating chamber connected to the second accommodating chamber, and a first inner hole step is arranged at the position where the first accommodating chamber and the second accommodating chamber are connected, wherein: the stress cone sleeve together with the porcelain jacket is inserted into the cable end from one side of the wire core, the porcelain jacket and the stress cone sleeve are rotated synchronously, the dry prefabricated terminal body is pushed to a predetermined position, and the end side of the semi-conductive step is pressed against the first inner hole step.

[0005] Wherein, a second inner hole step is provided at the position where the second accommodating cavity and the third accommodating cavity are connected, and the end side of the insulating layer is pressed against the second inner hole step.

[0006] The end side of the insulating layer connected to the semi-conductive step is coated with an insulating shielding layer.

[0007] The inner diameters of the first accommodating cavity, the second accommodating cavity and the third accommodating cavity are set to decrease in size.

[0008] The outside of the insulating layer and the inner walls of the three accommodating cavities of the stress cone sleeve are evenly coated with silicone grease.

[0009] The utility model also includes: a waterproof terminal which is detachably sleeved on the outer end of the porcelain housing.

[0010] A fourth accommodating cavity is provided inside the waterproof terminal, the waterproof terminal is fastened to the outer end of the porcelain housing, and the fourth accommodating cavity is connected to the third accommodating cavity for accommodating the wire core.

[0011] The end side of the waterproof terminal is provided with an assembly part for assembly with an overhead line, a disconnector, or an electrical equipment such as a transformer.

[0012] The stress cone sleeve and the porcelain jacket are integrally preformed.

[0013] Wherein, the stress cone sleeve is made of elastic material.

[0014] A dry prefabricated terminal implementing the present invention has the following beneficial effects: the dry prefabricated terminal comprises a cable end and a dry prefabricated terminal body coated on the outside of the cable end, the cable end comprises: a wire core and an insulating layer coated on the outside of the wire core, and a semi-conductive step is arranged at the end of the cable end; the dry prefabricated terminal body comprises: a stress cone sleeve and a porcelain jacket coated on the outside of the stress cone sleeve, the stress cone sleeve and the porcelain jacket are respectively hollow accommodating structures with openings at both ends; the stress cone sleeve comprises: a first accommodating cavity, A second accommodating chamber connected to the first accommodating chamber and a third accommodating chamber connected to the second accommodating chamber, a first inner hole step is provided at the position where the first accommodating chamber and the second accommodating chamber are connected, wherein: the stress cone sleeve together with the porcelain jacket is inserted into the cable end from one side of the wire core, the porcelain jacket and the stress cone sleeve are rotated synchronously, and the dry prefabricated terminal body is pushed to a predetermined position, and the end side of the semi-conductive step is pressed against the first inner hole step, which can effectively prevent the terminal from being damaged by long-term exposure to a severely polluted environment and extend its service life; the structure is reasonable and the cost is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a dry prefabricated terminal according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the dry prefabricated terminal body according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 2 , which is the first embodiment of the dry prefabricated terminal of the present invention.

[0020] The dry prefabricated terminal in this embodiment is mainly used for connecting cross-linked polyethylene insulated power cables with overhead lines, and connecting cables with electrical equipment such as transformers and disconnectors. It is suitable for power generation and transmission and distribution systems, and is particularly suitable for places with heavy pollution such as seaside, mines, petroleum, and chemical industries, such as those subject to dust, salt spray, acidity and alkali. It includes: a cable end 1 and a dry prefabricated terminal body 2 wrapped around the outside of the cable end.

[0021] The cable terminal includes: a core 11 and an insulating layer 12 coated on the outside of the core 11, and a semi-conductive step 3 is provided at the end of the cable terminal; the dry prefabricated terminal body 2 includes: a stress cone sleeve 21 and a porcelain jacket 22 coated on the outside of the stress cone sleeve 21.

[0022] In a specific implementation, the end side of the insulating layer 12 connected to the semi-conductive step 3 is coated with an insulating shielding layer 13. The stress cone sleeve 21 can be made of silicone rubber material. The silicone rubber in this embodiment can be made of insulating silicone rubber or semi-conductive silicone rubber, so as to balance the improvement of the electric field function and the insulation performance.

[0023] The stress cone sleeve 21 is a hollow containing structure with openings at both ends, which includes: a first containing chamber 211, a second containing chamber 212 connected to the first containing chamber 211, and a third containing chamber 213 connected to the second containing chamber 212; a first inner hole step 21a is provided at the position where the first containing chamber 211 and the second containing chamber 212 are connected, and a second inner hole step 21b is provided at the position where the second containing chamber 212 and the third containing chamber 213 are connected.

[0024] Preferably, the inner diameters of the first accommodating cavity 211 , the second accommodating cavity 212 , and the third accommodating cavity 213 are set to decrease in size to facilitate assembly of the cable end.

[0025] Furthermore, the ceramic jacket 22 is a hollow containing structure with openings at both ends. The purpose of using the ceramic jacket 22 to be sleeved on the outside of the stress cone sleeve 21 is to facilitate processing into a terminal and to fully utilize the high resistivity, high dielectric strength, good mechanical properties, and good heat dissipation and insulation capabilities of the ceramic jacket 22 in humid and corrosive environments, thereby having the advantage of a long service life.

[0026] Preferably, the stress cone sleeve 21 and the porcelain sleeve 22 are preformed as a whole. The purpose of such a setting is to make full use of the advantages of ceramics and silicone rubber. On the one hand, it can solve the disadvantages that silicone rubber is not easy to resist pollution and ceramics cannot be directly processed into terminals. On the other hand, it is also convenient for electrical performance testing before factory production to ensure product quality.

[0027] In addition, the porcelain jacket 22 can withstand temperatures up to 1000°C, has significantly higher resistance to surface degradation, and will not degrade or carbonate when charged; the surface is stable to the effects of ultraviolet radiation, and the surface is highly smooth and hard, resistant to rodents, termites, birds and other animals that can destroy the integrity of the polymer.

[0028] Furthermore, it also includes: a waterproof terminal 4, which is detachably sleeved on the outer end of the porcelain housing 22.

[0029] In this embodiment, a fourth accommodating cavity 41 is disposed inside the waterproof terminal 4 , and the waterproof terminal 4 is fastened to the outer end of the porcelain housing 22 . The fourth accommodating cavity 41 is connected to the third accommodating cavity 213 to accommodate the wire core 11 .

[0030] Preferably, the end side of the waterproof terminal 4 is provided with an assembly portion 42 for assembly with an overhead line, a disconnector, or an electrical device such as a transformer. The outer surface of the waterproof terminal 4 can also be sprayed with yellow, green, or red paint as a permanent phase sequence mark.

[0031] The dry prefabricated terminal in this embodiment does not require a platform to be built and can be installed vertically or tilted. The product can be used to connect to electrical equipment such as overhead lines, transformers, disconnectors, etc., without changing the existing connection method, which is convenient for the transformation of existing lines.

[0032] During the specific assembly, silicone grease is evenly applied to the outer part of the insulating layer 12 and the inner walls of the three accommodating cavities 211, 212, and 213 of the stress cone sleeve 21. In addition, the stress cone sleeve 21 is made of elastic material, so it can be easily installed on the cable terminal 1. Specifically, the stress cone sleeve 21 and the porcelain sleeve 22 are inserted into the cable terminal from one side of the wire core 11, and the porcelain sleeve 22 and the stress cone sleeve 21 are rotated synchronously to push the dry prefabricated terminal body 2 to the predetermined position, that is, the end side t of the semi-conductive step 3 is pressed against the first inner hole step 21a. At this time, the end side m of the insulating layer 12 is pressed against the second inner hole step 21b, which means that it is installed in place. Finally, the waterproof terminal 4 is fastened to the outer end of the porcelain sleeve 22, and the fourth accommodating cavity 41 is connected to the third accommodating cavity 213 to accommodate the wire core 11 exposed to the outside.

[0033] The dry prefabricated terminal in this embodiment has the advantages of good sealing, and the creepage distance of the porcelain jacket exceeds the highest level IV pollution level specified by the national standard by 10%. It is more environmentally friendly. Compared with polymers, ceramics have higher electrical strength and have a longer service life in terms of loads generated by electric charges and other temporary electrical phenomena.

[0034] The implementation of the dry prefabricated terminal of the present invention has the following beneficial effects: the dry prefabricated terminal comprises a cable end and a dry prefabricated terminal body coated on the outside of the cable end, the cable end comprises: a wire core and an insulating layer coated on the outside of the wire core, and a semi-conductive step is arranged at the end of the cable end; the dry prefabricated terminal body comprises: a stress cone sleeve and a porcelain jacket coated on the outside of the stress cone sleeve, the stress cone sleeve and the porcelain jacket are respectively hollow accommodating structures with openings at both ends; the stress cone sleeve comprises: a first accommodating cavity, a cavity corresponding to the first accommodating cavity A second accommodating chamber is connected to a third accommodating chamber connected to the second accommodating chamber, and a first inner hole step is provided at the position where the first accommodating chamber and the second accommodating chamber are connected, wherein: the stress cone sleeve together with the porcelain jacket is inserted into the cable end from one side of the wire core, the porcelain jacket and the stress cone sleeve are rotated synchronously, and the dry prefabricated terminal body is pushed to a predetermined position, and the end side of the semi-conductive step is pressed against the first inner hole step, which can effectively prevent the terminal from being damaged by long-term exposure to a severely polluted environment and extend its service life; the structure is reasonable and it is easier to control costs.

Claims

1. A dry prefabricated terminal, characterized in that: include: A cable terminal and a dry prefabricated terminal body coated on the outside of the cable terminal, wherein the cable terminal comprises: a wire core and an insulating layer coated on the outside of the wire core, and a semi-conductive step is provided at the end of the cable terminal; The dry prefabricated terminal body comprises: a stress cone sleeve and a porcelain jacket covering the outside of the stress cone sleeve, wherein the stress cone sleeve and the porcelain jacket are respectively hollow containing structures with openings at both ends; The stress cone sleeve comprises: a first accommodating chamber, a second accommodating chamber connected to the first accommodating chamber, and a third accommodating chamber connected to the second accommodating chamber, and a first inner hole step is provided at the position where the first accommodating chamber and the second accommodating chamber are connected, wherein: The stress cone sleeve together with the porcelain jacket is inserted into the cable end from one side of the wire core, the porcelain jacket and the stress cone sleeve are rotated synchronously, the dry prefabricated terminal body is pushed to a predetermined position, and the end side of the semi-conductive step is pressed against the first inner hole step.

2. The dry prefabricated terminal according to claim 1, characterized in that: A second inner hole step is provided at a position where the second accommodating cavity and the third accommodating cavity meet, and an end side of the insulating layer is pressed against the second inner hole step.

3. The dry prefabricated terminal according to claim 1, characterized in that: The exterior of the end side of the insulating layer connected to the semiconductive step is coated with an insulating shielding layer.

4. The dry prefabricated terminal according to claim 1, characterized in that: The inner diameter size of the first accommodating chamber, the inner diameter size of the second accommodating chamber, and the inner diameter size of the third accommodating chamber are set to decrease in size.

5. The dry prefabricated terminal according to claim 1, characterized in that: Silicone grease is evenly coated on the outside of the insulating layer and the inner walls of the three accommodating cavities of the stress cone sleeve.

6. The dry prefabricated terminal according to claim 1, characterized in that: Also includes: A waterproof terminal is detachably sleeved on the outer end of the porcelain housing.

7. The dry prefabricated terminal according to claim 6, characterized in that: A fourth accommodating cavity is provided inside the waterproof terminal, the waterproof terminal is fastened to the outer end of the porcelain housing, and the fourth accommodating cavity is connected to the third accommodating cavity for accommodating the wire core.

8. The dry prefabricated terminal according to claim 6, characterized in that: The end side of the waterproof terminal is provided with an assembly part for assembly with an overhead line, a disconnector, or an electrical equipment such as a transformer.

9. The dry prefabricated terminal according to claim 1, characterized in that: The stress cone sleeve and the porcelain jacket are integrally preformed.

10. The dry prefabricated terminal according to claim 9, characterized in that: The stress cone sleeve is made of elastic material.

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