JP4063745B2 - Polymer sleeve and cable termination connection using the same - Google Patents

Description

  The present invention relates to a polymer sleeve and a cable terminal connection portion using the same, and in particular, can simplify the structure, reduce the weight, and simplify the on-site construction, and can also provide insulation such as insulating oil and insulating gas. The present invention relates to a polymer sleeve suitable for laying on a substation or steel tower armature which does not require compound filling and has a low ceiling, and a cable terminal connection portion using the same.

  Conventionally, as this kind of cable terminal connection part, the thing of a structure as shown in FIG. 7 is known. In the figure, the conventional cable terminal connection portion includes a cable end portion 20 and a porcelain cannula 21 that encloses the cable end portion 20. An insulating compound 22 such as gas is filled.

  Here, an annular bottom metal fitting 23 is attached to the bottom of the porcelain porcelain tube 21, and an epoxy seat 24 is disposed concentrically with the porcelain porcelain tube 21 at a lower portion in the porcelain porcelain tube 21. Further, an upper metal fitting 24 and an upper cover 25 are respectively disposed on the top of the porcelain porcelain tube 21, and a conductor lead bar 26 is disposed concentrically with the porcelain porcelain tube 21 at the upper center portion in the porcelain porcelain tube 21. . The lower end portion of the conductor lead bar 26 is located in the porcelain porcelain tube 21, and the tip end portion is airtightly led upward from the center portion of the upper metal fitting 24 and the upper cover 25.

  In addition, a stress cone 28 is attached to the outer periphery of the cable insulator 27 constituting the cable terminal portion 20, and a conductor terminal 29 is attached to the tip of a cable conductor (not shown). In the figure, reference numeral 30 denotes a pressing device that presses the stress cone 28, 31a and 31b denote seal portions, 32 denotes a clamp, 33 denotes a support lever, and 34 denotes a support frame.

  In the cable terminal connection portion having such a configuration, the conductor terminal 29 is connected to the lower end portion of the conductor lead bar 26 located in the porcelain porcelain tube 21, and the outer surface of the stress cone 28 is connected to the inner wall surface of the epoxy seat 24. It is in pressure contact.

  However, in the cable terminal connection portion having such a configuration, the connection point between the conductor terminal 29 and the conductor lead-out rod 26 exists inside the porcelain porcelain tube 21, and thus has the following difficulties.

  First, since an epoxy seat for receiving a stress cone is present in the porcelain porcelain tube, the porcelain porcelain tube becomes thicker accordingly, and the weight of the porcelain porcelain tube increases accordingly.

  Secondly, when the outer diameter of the porcelain soot tube is increased, the projected cross-sectional area of the porcelain soot tube is increased, and consequently the fouling withstand voltage characteristic of the porcelain soot tube is reduced. There was a problem that a long porcelain porcelain tube had to be used.

  Third, since the porcelain soot tube is filled with the insulating compound, if the porcelain soot tube is damaged, the insulating compound may flow out of the porcelain soot tube and cause a secondary disaster.

  Fourthly, since parts such as an epoxy seat, an upper cover, and a clamp are required, the number of parts is increased and the structure is complicated.

  For this reason, (a) instead of the porcelain soot tube 21 shown in FIG. 7, a polymer cannula is used, and a cable terminal connecting portion formed by filling the polymer cannula with insulating oil or insulating gas, or (b) FIG. As shown, a conductor lead bar 42 disposed in the center, a hard insulating tube 43 disposed on the outer periphery of the conductor lead rod 42, and a polymer cover 44 integrally provided on the outer periphery of the insulating tube 43, A cable terminal connection portion has been developed in which the cable terminal portion 40 is mounted on the receiving port 46 of the polymer sleeve 41 having the above structure.

  However, in the cable terminal connection part (a), since the cannula is formed of a polymer material polymer, moisture permeates from the outside, and this moisture is mixed into the insulating oil or insulating gas in the polymer cannula. There was a possibility of deteriorating the performance of the insulating oil or insulating gas. In addition, in the cable terminal connection portion (b), there is no epoxy seat for receiving the stress cone in the polymer sleeve 41, and it is not necessary to fill the polymer sleeve 41 with an insulating compound. Although the structure of the pipe 41 can be simplified and reduced in weight, each part can be unitized and carried to the site, and further, the construction time can be shortened. Since the connection point between the cable conductor 45 of the cable terminal portion 40 and the conductor lead-out rod 42 exists in the polymer sleeve 41, the outer diameter of the polymer sleeve 41 becomes thick as in the above-described porcelain sheath tube, and the polymer sleeve However, if the polymer cannula 41 is thick, the projected cross-sectional area of the polymer cannula 41 increases, which leads to an increase in fouling withstand voltage characteristics. In order to, there is a drawback that must be used a polymer bushing long.

  For this reason, as shown in FIG. 9, the applicant of the present invention first has a hard insulating tube 53 having a conductor lead bar 51 at the center and a cable terminal receiving port 52 at the lower end, and the insulating tube 53. A polymer covering body 55 provided integrally with the outer periphery and having a plurality of flanges 54 formed on the outer periphery of the outer periphery so as to be spaced apart in the longitudinal direction, and the receiving port 52 is disposed at a lower position than the polymer covering body 55. A polymer sleeve 56 is developed and applied (Japanese Patent Application No. 2002-105432).

  According to the polymer sleeve 56 having such a configuration, first, since the polymer covering is integrally provided on the outer periphery of the hard insulating cylinder, it is lighter and more damaged than the conventional porcelain insulator tube. It is difficult to handle, can be handled easily, can greatly improve workability, and secondly, since no insulating oil or insulating gas is required, the environment can be harmonized, and thirdly, When the polymer cover is made of silicon polymer, the fouling voltage resistance can be improved due to the water repellency of the silicon polymer. Fourth, the receptacle of the insulating cylinder is arranged at a lower position than the polymer cover. Therefore, the polymer cannula can be made thinner than the conventional polymer cannula, and as a result, the projected cross-sectional area of the polymer cannula becomes smaller as a result of the narrowing of the polymer cannula. Fouling withstand voltage characteristics can be maintained. Fifth, since the connection between the conductor lead bar and the cable conductor is performed at a lower part than the polymer coating, the length of the stepped portion of the cable terminal portion is reduced. Sixth, since the embedded metal fitting is embedded in the polymer sleeve and this embedded metal piece is integrated with the bottom metal fitting, the polymer sleeve can be mechanically reinforced and the polymer The cannula is provided with an advantage that it can be easily and stably attached to an attachment frame or the like via the bottom fitting.

  However, in the polymer cannula 55 having such a configuration, the polymer cannula 55 is vertically installed on the arm metal 62 of the steel tower 61 as shown in FIG. When the cable terminal 57 (see FIG. 9) is attached to (see FIG. 9), the charging portion of the polymer cannula 55 (the tip of the conductor lead bar 51) and the armrest located at the top of the polymer cannula Since the separation distance between 62 becomes short, it is necessary to widen the separation distance between the arm brackets 62, and as a result, the steel tower 61 becomes large and disadvantageous in terms of cost.

Registered Utility Model Publication (Registration No. 3031834) (paragraph numbers “0002” to “0004”, FIG. 2)

  The present invention has been made to solve the above-mentioned problems, and is a polymer sleeve that is lightweight and compact and can simplify the structure, and is suitable for installation on a substation or a steel tower with a low ceiling. It is an object of the present invention to provide a polymer sleeve and a cable terminal connection using the same.

  The polymer sleeve according to the first aspect of the present invention is provided integrally with a hard insulating tube having a conductor lead bar at the center and a cable terminal receiving port at the lower end, and an outer periphery of the insulating tube. In a polymer cannula provided with a polymer covering formed with a number of flanges spaced apart in the longitudinal direction on its outer periphery, the polymer cannula is provided with a bent portion.

  The polymer sleeve according to the second aspect of the present invention is provided integrally with a hard insulating cylinder having a conductor lead bar at the center and a cable terminal receiving port at the lower end, and an outer periphery of the insulating cylinder. In the polymer cannula having a plurality of flanges formed on the outer periphery of the polymer cover and spaced apart in the longitudinal direction, the receiving port is disposed at a lower portion than the polymer cover, and the polymer cannula is disposed in the polymer cannula. Is provided with a bent portion.

  According to a third aspect of the present invention, in the polymer cannula according to the first aspect or the second aspect, a conductor insertion hole communicating with the receiving port is provided at a lower end portion of the conductor extraction rod, It is arrange | positioned below the polymer coating body.

  The polymer sleeve according to the fourth aspect of the present invention is provided integrally with a hard insulating cylinder having a conductor lead bar at the center and a cable terminal receiving port at the lower end, and an outer periphery of the insulating cylinder. A polymer cannula having a plurality of flanges formed on the outer periphery of the polymer cannula and spaced apart in the longitudinal direction; the polymer cannula is provided with a bent portion; A bracket having a portion is provided, the polymer cover is disposed at a position above the bracket, and the receiving port is disposed at a position below the bracket.

  According to a fifth aspect of the present invention, in the polymer sleeve according to the fourth aspect, the metal fitting is composed of an electric field relaxation embedded metal fitting that is embedded and fixed in a hard insulating cylinder.

  According to a sixth aspect of the present invention, in the polymer cannula according to any one of the first to fifth aspects, the bent portion is bent so as to be substantially L-shaped in the middle portion of the polymer cannula. It is a thing.

  According to a seventh aspect of the present invention, in the polymer sleeve according to any one of the first to sixth aspects, an insulating cylinder is integrally provided on the outer periphery of the conductor lead bar.

  According to an eighth aspect of the present invention, a cable terminal is attached to the receiving port of the polymer sleeve according to any one of the first to seventh aspects.

  According to a ninth aspect of the present invention, there is provided the polymer sleeve according to any one of the first to seventh aspects, wherein the tip of the polymer sleeve is positioned below the armrest on the armrest of the steel tower. The cable sleeve is attached to the receiving port of the polymer sleeve.

  The polymer cannula of the first to ninth aspects of the present invention has the following effects. That is, like the conventional polymer sleeve shown in FIG. 9, first, it is lighter and less likely to break than the conventional porcelain soot shown in FIG. Second, since no insulating oil or insulating gas is required, the environment can be harmonized. Third, in the case where the polymer covering is formed of silicon polymer, silicon polymer is used. Due to the water repellency, it is possible to improve the fouling withstand voltage characteristic. Fourth, since the receiving port of the insulating cylinder is disposed at a lower part than the polymer covering, the conventional polymer coating shown in FIG. As a result, the projected cross-sectional area of the polymer cannula is reduced, and as a result, a predetermined fouling withstand voltage characteristic can be maintained even with a short polymer cannula, 5th Since the conductor lead bar and the cable conductor are connected at a lower position than the polymer cover, the length of the stepped portion of the cable terminal can be shortened. Sixth, embedded in the polymer sleeve Since the bracket is embedded and this embedded bracket is integrated with the bottom bracket, the polymer cannula can be mechanically reinforced, and the polymer cannula can be easily attached to the mounting base via the bottom bracket. And it can be attached stably.

  In addition, since the bent portion is provided in the middle part of the polymer sleeve, the necessary separation distance can be secured sufficiently even if the polymer sleeve is installed on a substation with a low ceiling or on the arm end of a steel tower. be able to.

  Hereinafter, preferred embodiments of a polymer cannula of the present invention and a cable terminal connecting portion using the same will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of a polymer cannula of the present invention, and FIG. 2 is a partial cross-sectional view of an air terminal connection part of a 22 to 77 kV class CV cable using the polymer cannula of the present invention. .

  In FIG. 1, a polymer sleeve P of the present invention has an L-shaped bent portion at an intermediate portion and a conductor lead rod 1 having a conductor insertion hole 1 a at a lower end portion, and an outer periphery of the conductor lead rod 1. A hard insulating cylinder 2 provided and a polymer covering 3 provided on the outer periphery of the insulating cylinder 2 are provided, and as a whole have an L shape. Here, the insulating cylinder 2 is made of a material having high mechanical strength, for example, a hard plastic resin such as epoxy resin or FRP, and the polymer cover 3 is made of a material having excellent electrical insulation performance, for example, a high material such as silicon polymer. It is formed of a molecular insulating material, and the conductor lead bar 1, the insulating cylinder 2, and the polymer cover 3 are integrally formed by a mold.

  The insulating tube 2 is connected to the outer peripheral portion of the lower portion of the conductor lead bar 1, that is, the large-diameter insulating tube 2a provided on the outer peripheral portion corresponding to the conductor insertion hole 1a, and the upper portion of the large-diameter insulating tube 2a. And a small-diameter insulating tube 2b provided on the outer peripheral portion of the portion excluding the tip of the conductor lead bar 1, and an embedded metal fitting for electric field relaxation is provided in the continuous portion of the large-diameter insulating tube 2a and the small-diameter insulating tube 2b. 4 is buried. Further, a cone-shaped receiving port 5 for receiving a stress cone of a cable end portion, which will be described later, is provided at the lower end portion of the large-diameter insulating tube 2a. The receiving port 5 is connected to the conductor insertion hole 1a of the conductor lead bar 1 and It is communicated.

  The polymer cover 3 is provided on the outer peripheral portion of the small-diameter insulating cylinder 2b, and a large number of flanges 3a are separated along the longitudinal direction of the polymer cover 3 on the outer peripheral portion except the L-shaped bent portion L. Is formed.

  The embedded metal fitting 4 includes a cylindrical portion 4a concentrically embedded in the lower portion of the small-diameter insulating tube 2b and the lower end portion of the cylindrical portion 4a, and an outer peripheral edge portion of the large-diameter insulating tube. 2a and an annular flange portion 4b embedded so as to extend from the outer peripheral portion of the upper position of 2a. An annular bottom metal fitting 6 is attached to a lower end surface of the outer peripheral edge of the flange portion 4b with a fastening bolt (not shown). ) Is fixed through.

  In the figure, reference numeral 7 denotes a protective fitting that is disposed on the outer peripheral portion of the large-diameter insulating cylinder 2a and whose upper end is attached to the lower surface of the flange portion 4b of the embedded fitting 4.

  Next, a cable terminal connecting portion using the polymer sleeve of the present invention will be described.

  In FIG. 2, first, the polymer sleeve P is attached to the support frame 10 via the support insulator 9 disposed on the lower surface of the bottom metal fitting 6. Similarly to the conventional cable terminal portion, the stress cone 12 is attached to the outer periphery of the cable insulator 11a exposed by stripping the cable terminal, and the conductor terminal 13 is attached to the distal end portion of the cable conductor 11b. Here, the stress cone 12 is made of a pre-molded insulator having rubber-like elasticity such as ethylene propylene rubber (EP rubber), and the tip of the stress cone 12 is tapered to be attached to the inner wall surface of the receiving port 5. A cone-shaped part is provided.

  And the cable terminal part 11 of such a structure is attached to the receiving port 5, and the pressing device 14 previously disposed on the cable terminal side is compressed toward the receiving port 5 side. As a result, the conductor terminal 13 is plug-in connected to the conductor insertion hole 1 a of the conductor lead bar 1 and the cone-shaped portion of the stress cone 12 is pressed against the inner wall surface of the receiving port 5. Insulating performance of the interface between the outer peripheral surface of the cone-shaped portion is ensured.

  In the figure, reference numeral 15 denotes a seal portion, 16 denotes a lower metal fitting, 17 denotes an adapter, and 18 denotes a ground wire.

  As described above, in the polymer cannula of the present invention, since the receiving port is disposed at a lower part than the polymer coating, the polymer cannula can be made thinner than the conventional polymer cannula, Further, as a result of thinning of the polymer cannula, the projected cross-sectional area of the polymer cannula is reduced, and as a result, even a short polymer cannula can maintain a predetermined fouling withstand voltage characteristic. Furthermore, since the connection between the conductor lead bar and the cable conductor is performed at a position below the polymer cover, the length of the stepped portion of the cable terminal portion can be shortened. In addition, since the embedded metal fitting is embedded in the polymer sleeve and this embedded metal fitting is integrated with the bottom fitting, the polymer sleeve can be mechanically reinforced and the polymer sleeve can be attached to the bottom fitting. It can be easily and stably attached to a mounting stand or the like via Furthermore, since it has a bent part in the intermediate part, even if it installs on a substation with a low ceiling and the armrest of a steel tower, a required separation distance can be ensured.

  Here, in the above-described embodiment, the insulating cylinder 2 in which the diameter corresponding to the conductor insertion hole 1a is increased and the diameter excluding the tip portion of the conductor extraction rod 1 is reduced, that is, the large diameter insulating cylinder 2a and the small diameter. Although the insulating cylinder 2 formed of the insulating cylinder 2b is described, a so-called thinned polymer cannula in which a portion corresponding to the conductor insertion hole 1a is narrowed similarly to the small-diameter insulating cylinder 2b may be used.

  In the case where a polymer sleeve having a reduced diameter is used, the weight can be reduced as compared with the polymer sleeve of the embodiment shown in FIG.

  FIG. 3 shows an embodiment in which the polymer cannula P of the present invention is installed on a metal arm of a steel tower. In the figure, parts common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the polymer sleeve P protrudes on the arm metal Ta of the steel tower T with the tip of the polymer sleeve P protruding outward from the end of the arm metal Ta, and more than the arm metal Ta. It is installed to be located in the lower part. In the figure, reference numeral 19 denotes a mounting member for the polymer sleeve P, Tb denotes an insulator, and C denotes a 22 to 77 kV class CV23 cable.

  In this embodiment, the distal end portion of the polymer sleeve P (the distal end portion of the conductor pull-out bar 1) is protruded outward from the arm metal Ta, and is positioned below the arm metal Ta. In other words, the tip of the polymer cannula P is located sufficiently away from the adjacent arm metal Ta and the charging part (tip end) of the insulator Tb23. However, there is no need to increase the separation distance between the bracelets.

  Here, in the embodiment shown in FIG. 3, the case where the polymer sleeve P is installed on the steel tower is described, but it may be installed in a substation or the like with a low ceiling. In this case, as compared with the cable terminal connection portion shown in FIG. 9, the distance between the ceiling of the substation and the charging portion of the polymer tube P is equivalent to the bending portion L provided in the polymer tube P. The distance can be shortened.

  FIG. 4 shows another embodiment of the cable termination connection according to the present invention. In the figure, parts common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, a cone-shaped receiving port 5 ′ for receiving the stress cone 12 of the cable end portion 11 in the polymer sleeve P is bent in the horizontal direction.

  In this embodiment, the cable terminal portion 11 can be mounted from the horizontal direction.

  FIG. 7 is a partial cross-sectional view of another polymer cannula P ′ of the present invention, and FIG. 8 is an explanatory view when the polymer cannula P ′ is installed on a steel tower. In the figure, parts common to those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, as in the embodiment shown in FIG. 4, a cone-shaped receiving port 5 ′ for receiving the stress cone 12 of the cable end portion 11 in the polymer cannula P ′ is bent in the horizontal direction. In addition, a bent portion L ′ that is bent so as to exhibit an obtuse angle of about 100 ° to 150 ° is provided in an intermediate portion of the polymer sleeve P ′. As shown in FIG. 8, the polymer sleeve P ′ having such a structure has the horizontal portion of the polymer sleeve P ′ positioned on the arm metal Ta of the steel tower T, the tip portion inside the insulator Tb, and the arm metal. It is installed so as to be positioned below Ta.

  In this embodiment, since the tip portion of the polymer sleeve P ′ is present inside the insulator Tb, the arm metal Ta of the steel tower T is more stable than the embodiment shown in FIG. Can be installed on top.

  In the above-described embodiment, the polymer sleeve in which the receiving port is disposed below the polymer coating is described. However, the present invention is not limited to this, and as shown in FIG. A mouth may be provided in the lower end of the polymer coating. Further, the polymer sleeve is not limited to the one provided with a substantially L-shaped bent portion in the middle thereof, and may be one provided with a semicircular bent portion. Furthermore, the insulating tube provided on the outer periphery of the conductor lead bar may be provided separately from the conductor lead bar, and the receiving end of the cable end is not limited to the one facing downward or horizontally, for example, obliquely May be formed. Furthermore, the cable terminal connection part is not limited to the air terminal connection part, and may be applied to a gas / oil terminal connection part.

The partial cross section figure of the polymer sleeve of the present invention. The partial sectional view of the cable termination connection part of the present invention. The partial sectional view of the cable termination connection part concerning other examples of the present invention. The partial sectional view of the cable termination connection part concerning other examples of the present invention. The partial cross section figure of the polymer sleeve which concerns on the other Example of this invention. The partial sectional view of the cable termination connection part concerning other examples of the present invention. The partial sectional view of the conventional cable termination connection part. The partial sectional view of the conventional cable termination connection part. The partial sectional view of the conventional cable termination connection part. Explanatory drawing of the conventional cable termination connection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conductor extraction rod 1a ... Conductor insertion hole 2 ... Insulating cylinder 3 ... Polymer coating 3a ... Eaves part 5 ... Receiving port 11 ... Cable end P ... Polymer Cannula L ... Bent part

Claims (9)

A hard insulating tube having a conductor lead bar in the center and a cable terminal receiving port at the lower end;
In a polymer cannula provided integrally with the outer periphery of the insulating cylinder and having a polymer covering formed on the outer periphery of the insulating tube and spaced apart in the longitudinal direction,
The polymer cannula, wherein the polymer cannula is provided with a bent portion. A hard insulating tube having a conductor lead bar in the center and a cable terminal receiving port at the lower end;
In a polymer cannula provided integrally with the outer periphery of the insulating cylinder and having a polymer covering formed on the outer periphery of the insulating tube and spaced apart in the longitudinal direction,
The receiving port is disposed at a lower part than the polymer covering,
The polymer cannula, wherein the polymer cannula is provided with a bent portion. A conductor insertion hole communicating with the receiving port is provided at the lower end of the conductor lead bar,
3. The polymer cannula according to claim 1, wherein the conductor insertion hole is disposed at a lower part than the polymer covering. A hard insulating tube having a conductor lead bar in the center and a cable terminal receiving port at the lower end;
In a polymer cannula provided integrally with the outer periphery of the insulating cylinder and having a polymer covering formed on the outer periphery of the insulating tube and spaced apart in the longitudinal direction,
The polymer sleeve is provided with a bent portion,
The hard insulating cylinder is provided with a metal fitting having a flange portion,
The polymer covering is disposed in an upper part than the metal fitting,
The polymer sleeve, wherein the receiving port is disposed below the metal fitting.   5. The polymer sleeve according to claim 4, wherein the metal fitting is composed of a metal fitting for electric field relaxation that is embedded and fixed in the hard insulating cylinder.   6. The polymer cannula according to any one of claims 1 to 5, wherein the bent portion is bent so as to have a substantially L-shape at an intermediate portion of the polymer cannula.   The polymer sleeve according to any one of claims 1 to 6, wherein the insulating cylinder is integrally provided on an outer periphery of the conductor lead bar.   A cable terminal connecting portion, wherein a cable end is mounted on the receiving port of the polymer cannula according to any one of claims 1 to 7.   The polymer cannula according to any one of claims 1 to 7, wherein the polymer cannula is installed on an armor of a steel tower so that a tip end portion of the polymer cannula is positioned below the armor, A cable terminal connecting portion, wherein a cable end is attached to a receptacle of the polymer sleeve.

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