Polymer bushing and cable terminal end connector using the same

Abstract

It is intended to achieve the weight reduction, sliming, and downsizing of bushings, commonality of types of bushings, and simplification of operating steps. A polymer bushing comprises a conductor draw-out bar (1) having a conductor insertion hole (1a) in the lower end, a hard insulation sleeve (2) installed around the outer periphery of the conductor draw-out bar (1), a polymer clad body (3) installed around the outer periphery of the insulation sleeve (2), and an electric field mitigation layer installed on the interface between the insulation sleeve (2) and the polymer clad body (3). The insulation sleeve (2) comprises a large-diameter insulation sleeve (2a) installed around the outer periphery of the lower region of the conductor draw-out bar (1), and a small-diameter insulation sleeve (2b) installed around the outer periphery of a portion of the conductor draw-out bar (1) excluding the front end. An embedment metal part (4) for electric field mitigation purposes is embedded in a portion of connection between the large- and small-diameter insulation sleeves (2a, 2b). Further, installed at the lower end of the large-diameter insulation sleeve (2a) is a cone-shaped receiving port (5) for receiving the stress cone (13) of a cable terminal (11), the receiving port (5) communicating with the conductor insertion hole (1a) in the conductor draw-out bar (1).

Description

technical field [0001] The present invention relates to a polymer sleeve and a cable terminal using the polymer sleeve. More particularly, the present invention relates to a polymer bushing capable of simplifying the structure, reducing the weight, size and length, and facilitating on-site execution, which does not need to be filled with an insulating compound such as insulating oil or insulating gas, and is very suitable for installation In a substation with a low ceiling, or on the cross arm of a high-voltage wire tower. The invention also relates to a cable termination using the polymer sleeve. Background technique [0002] So far, as Figure 8 Cable terminations constructed as shown are known. Referring to the drawings, the prior art cable termination includes a cable termination 20 and a porcelain sleeve 21, which encloses the cable termination 20 and is filled with insulating compound 22, such as insulating oil or insulating gas. [0003] Here, an annular bottom met...

AI Technical Summary

Problems solved by technology

[0007] First of all, the first disadvantage is that since the epoxy resin seat for receiving the pressure cone is located inside the porcelain sleeve, the diameter of the porcelain sleeve is correspondingly increased, resulting in a large weight of the porcelain sleeve

[0008] The second disadvantage is that when the outer diameter of the porcelain bushing increases, its projected area increases, resulting in a decrease in the pollution withstand voltage characteristics of the porcelain bushing, so an extended porcelain bushing must be used to maintain the predetermined characteristics of the pollution withstand voltage

[0009] The third disadvantage is that the porcelain bushing is filled with insulating compound, so when the porcelain bushing is broken, the insulating compound may flow out of the porcelain bushing, causing secondary damage

[0010] The fourth disadvantage is that it requires a large number of parts and a complex structure due to the need for components such as epoxy resin mounts, upper cover plates and clamping metal fittings

However, since the connection node between the cable wire 45 of the cable termination 40 and the conductor pull-out rod 42 is located inside the polymer sleeve 41, there is a disadvantage: as in the aforementioned porcelain sleeve, the polymer sleeve 41 The outer diameter will increase, making it heavier

[0017] Secondly, as the operating voltage of the cable termination increases, the polymer sleeve 55 becomes longer, so during installation work, the handling of the polymer sleeve 55 will be changed due to the greater length and higher weight. more difficult

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