CN217028333U - Same-tower double-circuit cross transposition tower adopting jumper wire composite cross arm - Google Patents

Abstract

The utility model relates to a same-tower double-circuit cross transposition tower adopting jumper wire composite cross arms, which comprises a tower body, wherein three lower-layer cross arm parts and three upper-layer cross arm parts are sequentially arranged on the tower body from bottom to top, and a ground wire support is arranged at the top of the tower body; each lower floor's cross arm portion and upper strata cross arm portion all include inlet wire side strain insulator-string, the compound cross arm of wire jumper and the side strain insulator-string of being qualified for the next round of competitions, and inlet wire side strain insulator-string, the compound cross arm of wire jumper and the side strain insulator-string of being qualified for the next round of competitions set up around body of the tower circumference in proper order. The scheme of the utility model realizes that the cross transposition of two circuits can be completed by only 1 base tower, greatly reduces the number of towers, and has the advantages of small floor area, wider application range, small tower head size, small tower weight, investment saving and difficult windage yaw discharge phenomenon.

Description

Same-tower double-circuit cross transposition tower adopting jumper wire composite cross arm

Technical Field

The utility model relates to the technical field of transmission line towers, in particular to a same-tower double-circuit cross transposition tower adopting jumper wire composite cross arms.

Background

With the rapid development of social economy, the electrical load of cities rapidly rises, and transformer substations around the cities are arranged in a star-and-go chess manner, so that high-voltage lines are more densely woven like spider nets. Dense high-voltage overhead lines inevitably intersect with each other, and often meet the condition that double-circuit lines erected on the same tower need to be subjected to cross transposition. At present, three main schemes are provided at home for realizing the cross transposition of the same-tower double-circuit line: the simplex transposition (as shown in fig. 1A), the transposition in the vertically aligned file (as shown in fig. 1B), and the transposition in the delta aligned file (as shown in fig. 1C).

The single-circuit splitting and transposition mode needs to split the double-circuit line on the same tower into two independent single-circuit lines, then heighten the tower of one circuit line, stride over the other circuit line, and then combine the two circuits on the same tower. The whole process needs four-base single-loop towers, the number of the towers is large, the occupied area is large, the width of a corridor is wide, the environmental disturbance on the periphery of the line is large, in addition, flat ground obstacles are large, the mountain terrain condition is bad, and the tower position is not good to select. In addition, when two single circuit lines cross each other, there is the space alternately between upper strata circuit and the lower floor's circuit, has the not enough risk that causes discharge in clearance.

And the other two gear cross transposition modes also need to adopt two base cross transposition towers, so that the number of the towers is large. In addition, the position of the cross transposition of the two loops of lines is between the two base cross transposition towers, the two loops of lines are crossed in space, and due to the fact that the arc sag in the gears is large, when the two loops of lines swing asynchronously due to strong wind, the phenomena of insufficient gap distance and windage deflection discharge are prone to occurring. And in order to ensure that the two circuits have enough space distance during cross transposition in the gear, the cross arms of the cross transposition tower need to be lengthened, and the vertical distance needs to be increased between the upper three-phase cross arm and the lower three-phase cross arm, so that the height of the two-base cross transposition tower is higher, and simultaneously the cross arms on the two sides generate unbalanced moment on the tower body, and the tower weight is larger.

Therefore, the existing methods have the problems of large occupied area, large number of used towers, insufficient gap distance between the gears easily generated during crossing of two lines and the like.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the method provides a new transposition scheme for realizing double-circuit lines on the same tower, further reduces the using amount and materials of the tower, reduces the occupied area, and avoids the risk of discharge caused by swing of two-phase wires caused by strong wind when transposition is carried out in a gear.

According to the technical scheme of the utility model, the utility model provides a same-tower double-circuit cross transposition tower adopting jumper wire composite cross arms, which comprises a tower body, wherein three lower-layer cross arm parts and three upper-layer cross arm parts are sequentially arranged on the tower body from bottom to top, and the top of the tower body is provided with a ground wire support; each lower floor's cross arm portion and upper cross arm portion all include inlet wire side strain insulator-string, the compound cross arm of wire jumper and the side strain insulator-string of being qualified for the next round of competitions, and inlet wire side strain insulator-string, the compound cross arm of wire jumper and the side strain insulator-string of being qualified for the next round of competitions set up around body of the tower circumference in proper order.

In one embodiment, the strain insulator-string on the outgoing line side of the lower cross arm portion and the strain insulator-string on the outgoing line side of the upper cross arm portion are respectively located on two sides of the tower body.

In another embodiment, the strain string on the incoming line side of the lower cross arm portion and the strain string on the incoming line side of the upper cross arm portion are respectively located on two sides of the tower body.

In another embodiment, the three lower-layer cross arm parts have the same structure, and the three upper-layer cross arm parts have the same structure.

Furthermore, in a lower layer cross arm part or an upper layer cross arm part, the number of the jumper wire composite cross arms is one, two or more.

Furthermore, in a compound cross arm of wire jumper, including at least one post insulator and at least one oblique pull insulator, the post insulator is connected with the one end of oblique pull insulator, and other end looks interval all is connected with the body of the tower.

Preferably, in a jumper wire composite cross arm, the jumper wire composite cross arm comprises two post insulators and one or two cable-stayed insulators, wherein the post insulators are horizontally arranged, and the cable-stayed insulators are obliquely arranged above the post insulators.

Further, in a lower floor cross arm portion or an upper strata cross arm portion, the angle between inlet wire side strain insulator-string and the side strain insulator-string of being qualified for the next round of competitions is 70 degrees to 200 degrees.

Compared with the prior art, the utility model has the following beneficial technical effects:

1. the existing transposition mode needs a 4-base tower or a 2-base tower to complete transposition; the scheme of the utility model realizes that the cross transposition of two circuits can be completed by only 1 base tower, thereby greatly reducing the number of towers.

2. The existing single-disassembling cross transposition mode has larger occupied area, has more barriers on flat ground, is difficult to find enough space for placing a pole tower and is more difficult to find a proper position for erecting the pole tower in a rugged terrain in a mountainous area; the cross transposition tower has small occupied area, can find a proper tower erecting position no matter in a flat ground or a mountain area so as to complete cross transposition, has wider application range and small disturbance to the surrounding environment.

3. In the existing two-grade cross transposition mode, the position of cross transposition is positioned in the grade, so that at least two phases of wires are crossed in space, the arc sag of the wires in the grade is large, and the phenomenon of wind deflection discharge of the wires is easy to occur when the wind deflection swings asynchronously; the cross transposition position of the utility model is positioned at the jumper wire of the cross transposition tower, the sag of the jumper wire is very small, the swing amplitude of windage yaw is very small, and thus windage yaw discharge is not easy to occur.

4. The jumper wire composite cross arm is adopted, so that the jumper wire suspension insulator string is avoided, and the jumper wire gap does not control the size of the tower head any more, so that the interlayer spacing can be compressed, and the height of the whole tower is reduced; in addition, hang the strain insulator-string near the body of the tower, be favorable to the body of the tower atress, can compress the length of the compound cross arm of wire jumper moreover, further reduce the tower head size, reduce the tower weight, save the investment.

Drawings

Fig. 1A is a schematic diagram of a conventional simplex transposition method.

Fig. 1B is a schematic diagram of a conventional cross shift method in a vertical arrangement.

Fig. 1C is a schematic diagram of a conventional transposition mode in a triangular arrangement.

FIG. 2A is a schematic front view of a cross-index tower according to an embodiment of the present invention.

FIG. 2B is a schematic right view of the cross-exchange column of FIG. 2A.

Fig. 3 is a schematic diagram of the operation state of the transposition tower according to an embodiment of the utility model.

FIG. 4 is a schematic view of the operation of a transposition tower according to another embodiment of the utility model.

Fig. 5A is a top view of an upper/lower cross arm portion in accordance with yet another embodiment of the present invention.

Fig. 5B is a perspective view of the upper/lower cross arm portion shown in fig. 5A.

Fig. 6A-6C are schematic diagrams of three embodiments of jumper composite crossarms of the present invention.

The component names indicated by reference numerals in the drawings are as follows:

1. a tower body; 2. a lower cross arm portion; 3. an upper cross arm section; 4. a ground wire bracket; 5. strain insulator-string of incoming line side; 6. a jumper wire composite cross arm; 7. strain insulator-string on the outgoing line side; 8. a post insulator; 9. a cable-stayed insulator; 10. and (6) jumping wires.

Detailed Description

Referring to fig. 2A, 2B and 3, the double-circuit cross transposing tower with the jumper composite cross arm includes a tower body 1, three lower cross arm portions 2 and three upper cross arm portions 3 are sequentially arranged on the tower body 1 from bottom to top, and a ground wire support 4 is disposed at the top of the tower body 1.

Fig. 5A and 5B show a layout of a phase conductor during operation. Each lower floor cross arm portion 2 and upper cross arm portion 3 all include inlet wire side strain insulator-string 5, the compound cross arm of jumper 6 and the side strain insulator-string 7 of being qualified for the next round of competitions 7, and inlet wire side strain insulator-string 5, the compound cross arm of jumper 6 and the side strain insulator-string 7 of being qualified for the next round of competitions set up around 1 circumference of body of the tower in proper order. The side strain insulator-string 7 of being qualified for the next round of competitions of lower floor cross arm portion 2 and the side strain insulator-string 7 of being qualified for the next round of competitions of upper strata cross arm portion 3 are located the both sides of tower body 1 respectively and/or, the inlet wire side strain insulator-string 5 of lower floor cross arm portion 2 and the inlet wire side strain insulator-string 5 of upper strata cross arm portion 3 are located the both sides of tower body 1 respectively.

In one lower layer cross arm part 2 or one upper layer cross arm part 3, the number of jumper wire composite cross arms 6 is one, two or more. The jumper composite crossarms 6 can be arranged on any side of the tower body, and the number and the angle distribution of the jumper composite crossarms can be adjusted according to the sizes of the corners of the incoming line and the outgoing line (namely, the angle between the side tension string 5 and the line side tension string 7, such as half-circle or quarter-circle around the tower body), so that the optimal jumper gap is realized.

For example, in the embodiment shown in fig. 3, 5A and 5B, in one lower cross arm part 2 or one upper cross arm part 3, the strain insulator-string 5 on the incoming line side and the strain insulator-string 7 on the line side are connected to two pairs of angular positions of the square cross section of the tower body 1, the two strain insulators are approximately 180 degrees and are substantially parallel, and two jumper composite cross arms 6 are arranged between the two strain insulators. In another embodiment as shown in fig. 4, in each upper cross arm part 3, the connection point between the incoming line side tension string 5 and the line side tension string 7 and the tower body 1 is located at two adjacent angular positions on the same side of the square cross section of the tower body 1, the angle between the two tension strings is about 90 degrees and is basically vertical, and only one jumper composite cross arm 6 needs to be arranged between the two tension strings. It is conceivable that other angles may be designed as needed, for example, an angle between the inlet side tension string 5 and the outlet side tension string 7 is one of 70 degrees to 200 degrees. And, optionally, the three lower cross arm parts 2 are all the same in structure, and the three upper cross arm parts 3 are all the same in structure; of course, the structure may be designed differently according to the actual conditions such as the required winding angle.

Further, referring to fig. 6A to 6C, one jumper composite cross arm 6 includes at least one post insulator 8 and at least one cable-stayed insulator 9, and the post insulator 8 and the cable-stayed insulator 9 are connected at one end and at the other end spaced apart from each other and connected to the tower body 1. For example, the post insulator 8 is disposed horizontally, and the diagonal tension insulator 9 is disposed obliquely above the post insulator 8. Specifically, the model can be classified into, for example, a "double-column double-diagonal-pulling" model (including two post insulators 8 and two diagonal-pulling insulators 9) shown in fig. 6A, a "double-column single-diagonal-pulling" model (including two post insulators 8 and one diagonal-pulling insulator 9) shown in fig. 6B, and a "single-column single-diagonal-pulling" model (including one post insulator 8 and one diagonal-pulling insulator 9) shown in fig. 6C.

The operation principle of the transposition tower of the utility model is as follows.

For each phase of lead, the strain insulator-string 5 at the incoming side is positioned at one side of the tower body 1, the strain insulator-string 7 at the outgoing side is hung at the other side of the tower body 1, and the lead-in side lead is wound from one side to the other side of the tower body 1 by using the jumper composite cross arm 6 in a jumper 10 mode and is further connected to the lead at the outgoing side, so that the transposition of one phase of lead from one side to the other side is completed. Since the transposition is performed on the tower 1, there is no problem of insufficient clearance in the gears. The two-circuit (six-phase) wires adopt a vertical arrangement mode, wherein the three-phase wire of one circuit is suspended on the upper left side of the tower body 1 during wire inlet, is suspended on the upper right side of the tower body 1 during wire outlet, is suspended on the lower right side of the tower body 1 during wire inlet of the other circuit, and is suspended on the lower left side of the tower body 1 during wire outlet. The three-phase wires arranged on the upper-layer cross arm part 3 and the three-phase wires arranged on the lower-layer cross arm part 2 are completely staggered in the vertical direction, so that insufficient gaps caused by space crossing between two circuits are avoided. Therefore, the transposition process can be completed only by the base cross transposition tower.

The utility model adopts the jumper wire composite cross arm to perform winding jumping, avoids using a jumper wire suspension insulator string, and therefore, the jumper wire clearance does not control the size of the tower head any more. For a 500kV line, the interlayer spacing of adjacent upper and lower layers of wires can be compressed by 2-3 m, and the height of the whole tower can be reduced by 10-15 m; the length of the cross arm is shortened from 10-12 m to 2-3 m, and even the cross arm can be directly hung on a tower body, so that the unit weight of the tower is obviously reduced.

Claims (8)

1. The same-tower double-circuit cross transposition tower adopting jumper wire composite cross arms is characterized by comprising a tower body (1), wherein three lower-layer cross arm parts (2) and three upper-layer cross arm parts (3) are sequentially arranged on the tower body (1) from bottom to top, and a ground wire support (4) is arranged at the top of the tower body (1); each lower floor cross arm portion (2) with upper strata cross arm portion (3) all include inlet wire side strain insulator-string (5), the compound cross arm of wire jumper (6) and be qualified for the next round of competitions side strain insulator-string (7), inlet wire side strain insulator-string (5) the compound cross arm of wire jumper (6) with outlet wire side strain insulator-string (7) center on in proper order body of the tower (1) circumference sets up.

2. The double-circuit cross-transposing tower with the jumper wire composite cross arm as claimed in claim 1, wherein the outlet side tension string (7) of the lower cross arm part (2) and the outlet side tension string (7) of the upper cross arm part (3) are respectively located on two sides of the tower body (1).

3. The double-circuit cross-transposing tower on the same tower adopting the jumper composite cross arm as recited in claim 1, wherein the strain string (5) on the inlet side of the lower cross arm part (2) and the strain string (5) on the inlet side of the upper cross arm part (3) are respectively positioned on two sides of the tower body (1).

4. The same-tower double-circuit transposition tower adopting jumper composite cross arms as in claim 1, wherein the structures of the three lower-layer cross arm parts (2) are the same, and the structures of the three upper-layer cross arm parts (3) are the same.

5. The same-tower double-circuit transposition tower adopting jumper composite cross arms as in claim 1, wherein the number of jumper composite cross arms (6) in one lower layer cross arm part (2) or one upper layer cross arm part (3) is one, two or more.

6. The same-tower double-circuit cross transposing tower adopting the jumper composite cross arm as claimed in claim 1, wherein one jumper composite cross arm (6) comprises at least one post insulator (8) and at least one cable-stayed insulator (9), one end of the post insulator (8) is connected with one end of the cable-stayed insulator (9), and the other end of the post insulator is spaced apart from the other end of the cable-stayed insulator and is connected with the tower body (1).

7. The same-tower double-circuit transposition tower adopting the jumper composite cross arm as in claim 6, wherein two post insulators (8) and one or two cable-stayed insulators (9) are included in one jumper composite cross arm (6), the post insulators (8) are horizontally arranged, and the cable-stayed insulators (9) are obliquely arranged above the post insulators (8).

8. The double-circuit cross transposing tower on the same tower adopting the jumper composite cross arm as in any one of claims 1-7, characterized in that in one lower cross arm part (2) or one upper cross arm part (3), the angle between the inlet side tension string (5) and the outlet side tension string (7) is 70-200 degrees.

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