35kV cold contraction type cable terminal with adjustable creepage distance

Abstract

The utility model belongs to the technical field of cable accessories, and particularly relates to a 35kV cold contraction type cable terminal with an adjustable creepage distance. According to the utility model, a cold shrink sheath tube is sleeved outside a cable end shielding layer; the cold shrinkage terminal main body is sleeved outside the cable end, a lower port of the cold shrinkage terminal main body is sleeved at an upper port of the cold shrinkage sheath tube, the cold shrinkage terminal main body comprises an insulating umbrella skirt which is located at the lower part of the cold shrinkage terminal main body, and a semi-conductive stress cone is arranged at the lower part of the insulating umbrella skirt; the at least one insulating creepage-increasing umbrella skirt is located at the upper part of the cold shrinkage terminal main body, the lower part of the insulating creepage-increasing umbrella skirt sleeves the upper part of the insulating umbrella skirt, and the insulating creepage-increasing umbrella skirt has various creepage distances; the wiring terminal is crimped at the end of the wire core; and the cold shrinkage sealing pipe is sleeved outside the cold shrinkage terminal main body and the wiring terminal. The utility model is used for solving the technical problems in the prior art that the creepage distance of the cable terminal cannot be adjusted, and the cable terminal comprising umbrella skirts with different creepage distances can be prepared by a large number of moulds, so that the cost of the moulds is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of cable accessories, and particularly relates to a 35kV cold shrinkable cable terminal with adjustable creepage distance. BACKGROUND

[0002] The cold shrinkable cable terminal is a cable accessory formed by injecting and vulcanizing an elastomer material in a factory, then expanding the diameter and lining with a pullable spiral support. During installation, the pre-expanded part is sleeved on the cable end or joint after treatment, the spiral support inside is pulled out, and the elastic material is compressed on the cable insulation. Unlike the heat shrinkable cable terminal formed by heating and shrinking, the cable accessory formed by elastic retraction at room temperature is called a cold shrinkable cable terminal.

[0003] The 35kV cold shrinkable cable terminal is a cable terminal head in the process of power transmission and is an indispensable component in the power system.

[0004] The creepage distance of the cable terminal refers to the shortest distance or the sum of the shortest distances between the conductive parts under normal operating voltage along the umbrella skirt surface, and the creepage distance is mainly determined by the number and diameter of the umbrella skirt.

[0005] In the user site of the power system, the creepage distance of the cable terminal is determined according to the site contamination degree. The site contamination degree (SPS) level is the maximum value of the equivalent salt deposit density (ESDD) / insoluble deposit density (NSDD) or the site equivalent salinity (SES) recorded on the terminal surface after a proper pollution time. The required creepage distance of the cable terminal is different for different site contamination degrees (SPS) levels, and the inappropriate creepage distance affects the use of the cold shrinkable cable terminal.

[0006] The existing cold shrinkable cable terminal uses an integrated and fixed-length insulating umbrella skirt, which requires a variety of specifications and different lengths of insulating umbrella skirts, resulting in high cost of mold for manufacturing the insulating umbrella skirt and greatly increasing the production cost. INVENTION CONTENTS

[0007] The utility model solves the technical problems in the prior art, provides a 35kV cold shrinkable cable terminal with adjustable creepage distance, and solves the technical problems of the unadjustable creepage distance of the cable terminal in the prior art and the need for a large number of molds to manufacture a cable terminal containing umbrella skirts with different creepage distances, thereby increasing the mold cost.

[0008] The technical solution of the utility model to solve the above technical problems is as follows: a 35kV cold shrinkable cable terminal with adjustable creepage distance, comprising:

[0009] A cold shrink sheath pipe is sleeved outside the end shielding layer of the cable;

[0010] A cold shrink terminal body is sleeved outside the end of the cable, and a lower port of the cold shrink terminal body is sleeved in an upper port of the cold shrink sheath pipe, and the cold shrink terminal body comprises:

[0011] An insulating umbrella skirt is located at a lower part of the cold shrink terminal body, and a lower part of the insulating umbrella skirt is provided with a semi-conductive stress cone;

[0012] At least one insulating creepage umbrella skirt is located at an upper part of the cold shrink terminal body, and a lower part of the insulating creepage umbrella skirt is sleeved in an upper part of the insulating umbrella skirt, and the insulating creepage umbrella skirt has multiple creepage distances;

[0013] A terminal is crimped at a core end of the cable;

[0014] A cold shrink sealing pipe is sleeved outside the cold shrink terminal body and the terminal.

[0015] The insulating creepage umbrella skirt and the insulating umbrella skirt in the cold shrink terminal body are matched to realize adjustment of the creepage distance, specifically, the insulating umbrella skirt ensures the basic creepage distance, the insulating creepage umbrella skirt increases the creepage distance, and the creepage distance of the insulating creepage umbrella skirt has multiple specifications, so that the insulating umbrella skirt matched with the insulating creepage umbrella skirt of different specifications can realize adjustable creepage distance.

[0016] Further, an annular protrusion is arranged on an outer wall of the upper part of the insulating umbrella skirt, and an annular groove is arranged on an inner wall of the lower part of the insulating creepage umbrella skirt;

[0017] The annular protrusion is also arranged on an outer wall of the upper part of the insulating creepage umbrella skirt;

[0018] The annular protrusion and the annular groove are matched.

[0019] The annular protrusion and the annular groove are matched.

[0020] Further, the inner walls of the cold shrink sheath pipe, the cold shrink terminal body and the cold shrink sealing pipe are respectively provided with polypropylene buckle type support strips.

[0021] The polypropylene buckle type support strips have good weather resistance, flexibility and support, and are convenient to pull out.

[0022] Further, the creepage distance of the insulating umbrella skirt is greater than 660 mm.

[0023] The beneficial effect of the present step is that the single insulating umbrella skirt can meet the basic creepage distance under low field contamination.

[0024] Further, the creepage distance of the insulating creepage increasing umbrella skirt is provided with three kinds, respectively 200mm, 400mm and 600mm.

[0025] The beneficial effect of the present step is that through the combination of the insulating creepage increasing umbrella skirts with different creepage distances, the creepage distance requirements under different levels of field contamination can be met.

[0026] The beneficial effect of the present utility model is:

[0027] 1. The present application can meet the creepage distance use requirements under different levels of field contamination through different combinations of the insulating umbrella skirt and the insulating creepage increasing umbrella skirt.

[0028] 2. Through the combination of different insulating creepage increasing umbrella skirts, a plurality of lengths of creepage distances can be combined, so that through the different settings of the insulating creepage increasing umbrella skirts, the mold specifications of the insulating umbrella skirt in the prior art can be reduced, thereby reducing the mold cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0030] Figure 1 A half sectional view of the 35kV cold shrink type cable terminal with adjustable creepage distance provided by the present utility model;

[0031] Figure 2 A half sectional view of the cold shrink terminal main body of the 35kV cold shrink type cable terminal with adjustable creepage distance provided by the present utility model.

[0032] REFERENCE NUMERALS:

[0033] 1-cold shrink sheath pipe; 2-cold shrink terminal main body; 3-wiring terminal; 4-cold shrink sealing pipe;

[0034] 21-insulating umbrella skirt; 22 insulating creepage increasing umbrella skirt; 51-shielding layer; 52-wire core;

[0035] 211-semi-conductive stress cone; 221-ring-shaped protrusion; 222-ring-shaped groove. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0037] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] Example

[0043] As Figure 1 and Figure 2 The utility model provides a kind of 35kV cold shrinkable cable terminal of adjustable creepage distance, comprising:

[0044] Cold shrinkable sheath pipe 1, the cold shrinkable sheath pipe 1 is packed in the end shielding layer 51 of cable outside;

[0045] Cold shrinkable terminal body 2, the cold shrinkable terminal body 2 is packed in the end of the cable outside, and the lower port of the cold shrinkable terminal body 2 is packed in the upper port of the cold shrinkable sheath pipe 1, and the cold shrinkable terminal body 2 includes:

[0046] Insulating umbrella skirt 21, the insulating umbrella skirt 21 is located in the lower part of the cold shrinkable terminal body 2, and the lower part of the insulating umbrella skirt 21 is equipped with semiconductive stress cone 211;

[0047] At least one insulating creepage increasing umbrella skirt 22, the insulating creepage increasing umbrella skirt 22 is located in the upper part of the cold shrinkable terminal body 2, and the lower part of the insulating creepage increasing umbrella skirt 22 is packed in the upper part of the insulating umbrella skirt 21, and the insulating creepage increasing umbrella skirt 22 has multiple creepage distances;

[0048] Binding post 3, the binding post 3 is crimped in the end of the core 52 of cable;

[0049] Cold shrinkable sealing pipe 4, the cold shrinkable sealing pipe 4 is packed in the cold shrinkable terminal body 2 and the binding post 3 outside.

[0050] The utility model discloses the collocation of insulating creepage increasing umbrella skirt 22 and insulating umbrella skirt 21 in cold shrinkable terminal body 2, to realize the adjustment of creepage distance, specifically, insulating umbrella skirt 21 guarantees basic creepage distance, and insulating creepage increasing umbrella skirt 22 improves the creepage distance of increased, and the creepage distance of insulating creepage increasing umbrella skirt 22 has multiple specifications, so insulating umbrella skirt 21 collocation different specifications insulating creepage increasing umbrella skirt 22 can realize the adjustable creepage distance.

[0051] On the basis of the above technical scheme, the upper outer wall of the insulating umbrella skirt 21 is equipped with annular protrusion 221, and the lower inner wall of the insulating creepage increasing umbrella skirt 22 is equipped with annular groove 222;

[0052] The upper outer wall of the insulating creepage increasing umbrella skirt 22 is also equipped with the annular protrusion 221;

[0053] The annular protrusion 221 and the annular groove 222 are adapted.

[0054] The insulating umbrella skirt 21 and the insulating creepage umbrella skirt 22 are fixed by the annular protrusion 221 and the annular groove 222, and the positioning effect is achieved, and then the insulating umbrella skirt 21 and the insulating creepage umbrella skirt 22 are wrapped with insulating tape and other wrapping materials. Similarly, if multiple insulating creepage umbrella skirts 22 need to be stacked, the annular protrusion 221 and the annular groove 222 can also play the same positioning role, ensuring that the sleeving distance of the two is long enough.

[0055] On the basis of the above technical scheme, the inner wall of the cold shrink protective sleeve pipe 1, the cold shrink terminal body 2 and the cold shrink sealing pipe 3 is respectively provided with a polypropylene buckle type support strip.

[0056] The polypropylene buckle type support strip has good weather resistance, flexibility and support, and is convenient to pull out.

[0057] On the basis of the above technical scheme, the creepage distance of the insulating umbrella skirt 21 is greater than 660 mm.

[0058] The single insulating umbrella skirt 21 can meet the basic creepage distance under low field contamination, and can meet the basic equipment requirements.

[0059] On the basis of the above technical scheme, the creepage distance of the insulating creepage umbrella skirt 22 is provided with three kinds, which are 200 mm, 400 mm and 600 mm.

[0060] Through the combination of insulating creepage umbrella skirts 22 with different creepage distances, the requirements of the creepage distance under different levels of field contamination can be met.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A 35kV cold-shrink cable terminal with adjustable creepage distance, characterized in that, include: Cold shrink tubing, which is fitted over the outer layer of the cable end shielding; A cold-shrink termination body, wherein the cold-shrink termination body is sleeved on the outside of the cable end, and the lower port of the cold-shrink termination body is sleeved on the upper port of the cold-shrink sheath, the cold-shrink termination body comprising: An insulating umbrella skirt is located at the lower part of the cold shrink terminal body, and a semi-conductive stress cone is provided at the lower part of the insulating umbrella skirt; At least one insulating creepage-enhancing skirt, the insulating creepage-enhancing skirt being located on the upper part of the cold shrink terminal body, and the lower part of the insulating creepage-enhancing skirt being sleeved on the upper part of the insulating skirt, the insulating creepage-enhancing skirt having multiple creepage distances; A terminal block, which is crimped to the end of the conductor of the cable; A cold-shrink sealing tube is sleeved over the cold-shrink terminal body and the wiring terminal.

2. The 35kV cold-shrink cable terminal with adjustable creepage distance according to claim 1, characterized in that, The upper outer wall of the insulating umbrella skirt is provided with an annular protrusion, and the lower inner wall of the insulating climbing umbrella skirt is provided with an annular groove. The upper outer wall of the insulating climbing umbrella skirt is also provided with the aforementioned annular protrusion; The annular protrusion and the annular groove are adapted to each other.

3. The 35kV cold-shrink cable terminal with adjustable creepage distance according to claim 1, characterized in that, The inner walls of the cold shrink sheath, the cold shrink terminal body, and the cold shrink sealing tube are all provided with polypropylene snap-on support strips.

4. The 35kV cold-shrink cable terminal with adjustable creepage distance according to claim 1, characterized in that, The creepage distance of the insulating umbrella skirt is greater than 660mm.

5. The 35kV cold-shrink cable terminal with adjustable creepage distance according to claim 4, characterized in that, The creepage distance of the insulating creepage-enhancing umbrella skirt is provided in three types: 200mm, 400mm and 600mm.

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