Single-circuit transposition tower and transposition structure

Abstract

The utility model provides a single-loop transposition tower and a transposition structure, which can better ensure the spatial distance between jumpers, is beneficial to control the weight of a tower head and reduce the cost of a tower body, and relates to the technical field of power transmission line iron towers. The single-circuit transposition tower comprises a tower body, a ground wire cross arm, an upper wire cross arm and a lower wire cross arm which are parallel to one another are sequentially arranged from the tower body to the tower top downwards at intervals, the ground wire cross arm, the upper wire cross arm and the lower wire cross arm are symmetrically arranged relative to the tower body, and the lengths of the ground wire cross arm, the upper wire cross arm and the lower wire cross arm are sequentially increased. One side of the tower body is provided with a jumper support which is horizontally arranged and used for jumper wires, the jumper support and the lower wire cross arm are located on the same plane, an included angle exists between the jumper support and the lower wire cross arm, and a first jumper wire insulator string used for jumper wires is hung below one end of the upper wire cross arm; and a second jumper insulator string for the jumper is hung below the other end of the second jumper insulator string.

Description

TECHNICAL FIELD

[0001] The utility model relates to power transmission line tower technical field, concretely is a single circuit transposition tower and transposition structure. BACKGROUND

[0002] The function of line transposition is to reduce the unbalanced current and unbalanced voltage during the normal operation of the power system, and in the power grid directly grounded at the neutral point, the length of the transmission line exceeding 100km should be transposed. The transposition cycle length should not be greater than 200km.

[0003] At present, the long distance transmission line using single circuit tower generally uses rolling transposition and suspension transposition. Rolling transposition realizes transposition by using the height difference between the conductors in the span through two straight towers. Suspension transposition realizes transposition by crossing two short jumpers and a long jumper through a group of strain insulator strings separately connected on each phase conductor. The above two schemes are all implemented in the span, the conductors are all soft connection, and the conductors cross in the span, so the gap between the conductors is difficult to control, the safety risk is high, and the construction and operation and maintenance are very difficult, which is only suitable for the plain and hilly areas with small height difference and light icing.

[0004] The utility model patent with publication number CN206360454U discloses a single circuit down winding jump transposition tower, which comprises a tower body, a conductor cross arm connected to the top end of the tower body, a left-phase jumper support for left-phase conductor transposition and a right-phase jumper support for right-phase conductor transposition fixedly connected to the two ends of the conductor cross arm, and the left-phase jumper support and the right-phase jumper support are located below the conductor cross arm. In this scheme, the conductors are arranged on the same conductor cross arm, and the jumpers wind from below the conductors. This scheme can realize transposition by only adding a left-phase jumper support and a right-phase jumper support to the original tower, without increasing the size and load of the original tower, and the structure is simple. However, since the three conductors are arranged on the same conductor cross arm, it is inevitable that the two crossing jumpers are close in space distance, especially when the transmission voltage is high, the problem is more prominent. The utility model patent with publication number CN203626363U discloses a high-voltage alternating current single circuit transposition tower, which comprises a ground wire cross arm arranged on the upper end of the tower body, a first ground wire support for first-phase conductor transposition and a second ground wire support for second-phase conductor transposition fixedly connected to the two ends of the ground wire cross arm, a conductor cross arm fixedly connected to the tower body below the ground wire cross arm, and a jumper support connected to one end of the conductor cross arm; the common part of the tower body and the conductor cross arm is fixedly connected with a transposition support, and the end of the transposition support and the jumper support are used for transposing the third conductor. This transposition tower can better ensure the space distance between the jumpers, but since the two ends of the ground wire cross arm are used as the jumper supports for the two-phase conductors, the length of the ground wire cross arm will inevitably increase, which will greatly increase the tower head load and weight, and this will greatly increase the manufacturing cost of the tower body. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a single-circuit transposition tower and transposition structure that can better guarantee the spatial distance between jumpers, help control the weight of the tower head, and reduce the cost of the tower body.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a single-circuit transposition tower, including a tower body, wherein a ground wire crossarm, an upper conductor crossarm, and a lower conductor crossarm are arranged in parallel from the top of the tower body downwards. The ground wire crossarm, the upper conductor crossarm, and the lower conductor crossarm are all arranged symmetrically with respect to the tower body. The lengths of the ground wire crossarm, the upper conductor crossarm, and the lower conductor crossarm increase sequentially. A jumper bracket for jumpers is provided on one side of the tower body. The jumper bracket and the lower conductor crossarm are on the same plane, and there is an angle between the jumper bracket and the lower conductor crossarm. A first jumper insulator string for jumpers is suspended below one end of the upper conductor crossarm, and a second jumper insulator string for jumpers is suspended below the other end.

[0007] Furthermore, the angle between the jumper bracket and the lower conductor crossarm is 90°.

[0008] Furthermore, a third jumper insulator string for jumpers is suspended below the jumper bracket.

[0009] Furthermore, the upper conductor crossarm is provided with tension insulator strings for connecting the transmission line on both sides of one end of the second jumper insulator string.

[0010] Furthermore, tension insulator strings for connecting transmission lines are also provided on both sides of the lower conductor crossarm, and a fourth jumper insulator string for jumpers is suspended at one end of the lower conductor crossarm located on the side of the first jumper insulator string.

[0011] A single-circuit transposition structure includes the aforementioned single-circuit transposition tower. The single-circuit transposition tower has an output single-circuit line on one side of the jumper bracket and an input single-circuit line on the other side. The input single-circuit line includes phase A1, phase B1, and phase C1, and the output single-circuit line includes phase A2, phase B2, and phase C2.

[0012] Phase A1 and phase C1 are respectively connected to both ends of the lower conductor crossarm via tension insulator strings. Phase A1 is located at the end of the lower conductor crossarm near the second jumper insulator string. Phase B1 is connected to the end of the upper conductor crossarm where the second jumper insulator string is located via a tension insulator string. Phase C2 is connected to the end of the lower conductor crossarm where phase A1 is located via a tension insulator string. Phase B2 is connected to the end of the lower conductor crossarm where phase C1 is located via a tension insulator string. Phase A2 is connected to the end of the upper conductor crossarm where phase B1 is located via a tension insulator string.

[0013] The A1 phase is provided with a first jumper wire for connecting the A2 phase, and the first jumper wire is connected with the A2 phase through the second jumper wire insulator string;

[0014] The B1 phase is provided with a second jumper wire for connecting the B2 phase, and the second jumper wire is connected with the B2 phase through the first jumper wire insulator string;

[0015] The C1 phase is provided with a third jumper wire for connecting the C2 phase, and the third jumper wire is connected with the C2 phase through the fourth jumper wire insulator string hung below the lower conductor cross arm and the third jumper wire insulator string hung below the jumper wire support.

[0016] The single circuit transposition tower and the transposition structure of the utility model, the transposition tower can connect the middle term (B1 phase) of the input line at one end of the upper conductor cross arm 12 which is smaller than the lower conductor cross arm 13 and larger than the ground wire cross arm 11, and connect the other two terms at two ends of the lower conductor cross arm 13, the jumper wires of two terms can be wound transposition through the first jumper wire insulator string and the second jumper wire insulator string arranged at two ends of the upper conductor cross arm 12 respectively when transposing, and the other term can be wound transposition through the jumper wire support 14 at one end, thus, the space distance between the jumper wires can be better guaranteed, and the utility model is especially suitable for high voltage transmission line transposition, and because the first jumper wire insulator string 121 and the second jumper wire insulator string 122 are arranged at two ends of the upper conductor cross arm 12 respectively, that is, the two ends of the upper conductor cross arm 12 are used as the support jumper wire when transposing, and the ground wire cross arm 11 is arranged above the upper conductor cross arm 12 alone, thus, the length of the ground wire cross arm 11 and the upper conductor cross arm 12 can be shorter, compared with the existing upper winding jumper wire mode, the transposition tower of the utility model is beneficial to reducing the tower head load and weight and reducing the tower body manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the single circuit transposition structure schematic view of the utility model;

[0018] Figure 2 It is the single circuit transposition structure schematic view of the utility model;

[0019] As shown in the figure: tower body 1, tension insulator string 2, jumper wire support rod 3, first jumper wire 4, second jumper wire 5, third jumper wire 6, ground wire cross arm 11, upper conductor cross arm 12, lower conductor cross arm 13, jumper wire support 14, first jumper wire insulator string 121, second jumper wire insulator string 122, fourth jumper wire insulator string 131, third jumper wire insulator string 141. DETAILED DESCRIPTION

[0020] The utility model is further explained below in combination with the drawings and examples.

[0021] As Figure 1 , Figure 2 shown, the single loop transposition tower of the utility model, including tower body 1, the tower body 1 tower top is sequentially spaced and is provided with the ground wire cross arm 11, upper wire cross arm 12 and lower wire cross arm 13 mutually parallel, the ground wire cross arm 11, upper wire cross arm 12 and lower wire cross arm 13 are all symmetrically arranged relative to tower body 1, the length of ground wire cross arm 11, upper wire cross arm 12, lower wire cross arm 13 is sequentially increased, one side of tower body 1 is equipped with the jumper wire support 14 of horizontal arrangement, jumper wire support 14 and lower wire cross arm 13 are in the same plane, and there is the included angle between jumper wire support 14 and lower wire cross arm 13, the lower one end of upper wire cross arm 12 is hung and is equipped with the first jumper wire insulator string 121 for jumper wire, and the lower one end of the other end is hung and is equipped with the second jumper wire insulator string 122 for jumper wire.

[0022] The included angle between jumper wire support 14 and lower wire cross arm 13 can be greater than 0 ° and less than 180 °, generally in 45 ° ~ 135 °, in the embodiment of the utility model, the included angle between jumper wire support 14 and lower wire cross arm 13 is 90 °.

[0023] The specific interval between ground wire cross arm 11, upper wire cross arm 12 and lower wire cross arm 13 is same with the existing iron tower cross arm design, according to the transmission voltage of transmission line, line type etc., should meet the power operation demand and safety specification.

[0024] As Figure 1 And Figure 2As shown, when using the transposition tower of this utility model, the output single-circuit line is set on one side of the single-circuit transposition tower with jumper bracket 14, and the input single-circuit line is set on the other side of the transposition tower. Assuming the input single-circuit line includes phases A1, B1, and C1, and the output single-circuit line includes phases A2, B2, and C2, during transposition, phases A1 and C1 can be connected to both ends of the lower conductor crossarm 13 via tension insulator strings 2. Phase A1 is located at the end of the lower conductor crossarm 13 near the second jumper insulator string 122. Phase B1 can be connected to the end of the upper conductor crossarm 12 with the second jumper insulator string 122 via tension insulator string 2. Phase C2 can be connected to the end of the lower conductor crossarm 13 with phase A1 via tension insulator string 2. Phase B2 can be connected to the end of the lower conductor crossarm 13 with the second jumper insulator string 122 via tension insulator string 2. One end of phase C1 is provided, and phase A2 can be connected to the end of phase B1 on the upper conductor crossarm 12 via tension insulator string 2. Phase A1 is provided with a first jumper 4 for connecting phase A2, and the first jumper 4 can be led up to connect phase A2 via a second jumper insulator string 122. Phase B1 is provided with a second jumper 5 for connecting phase B2, and the second jumper 5 can be led down to connect phase B2 via a first jumper insulator string 121 at the other end of the upper conductor crossarm 12. Phase C1 is provided with a third jumper 6 for connecting phase C2, and the third jumper 6 can be introduced laterally to connect phase C2 via a fourth jumper insulator string 131 suspended below the lower conductor crossarm 13 and a third jumper insulator string 141 suspended below the jumper bracket 14, so as to realize transposition. The ground wire of the transmission line can be connected to the ground wire crossarm 11.

[0025] Phase A1 is located at one end of the lower conductor crossarm 13 near the second jumper insulator string 122, that is: Phase A1 is located at one end of the lower conductor crossarm and at the same side as the end of the upper conductor crossarm 12 where the second jumper insulator string 122 is located.

[0026] The transposition tower can connect the middle phase (B1 phase) of the input line to one end of the upper conductor cross arm 12 which is smaller than the lower conductor cross arm 13 and larger than the ground wire cross arm 11, and connect the other two phases to the two ends of the lower conductor cross arm 13, and when transposing, the jumper wire of two phases can be wound around the transposition respectively through the first jumper wire insulator string and the second jumper wire insulator string arranged at the two ends of the upper conductor cross arm 12, and the other phase can be wound around the transposition through the one end of the jumper wire support 14. Compared with the existing lower winding jumper scheme, the present scheme can better ensure the space distance between the jumper wires, and because the first jumper wire insulator string 121 and the second jumper wire insulator string 122 are arranged at the two ends of the upper conductor cross arm 12, that is, the two ends of the upper conductor cross arm 12 are used as support jumper wire when the jumper wire is wound, and the ground wire cross arm 11 is arranged above the upper conductor cross arm 12, in this way, the length of the ground wire cross arm 11 and the upper conductor cross arm 12 can be shorter, compared with the existing upper winding jumper scheme, the present utility model is helpful to reduce the tower head load and weight, and reduce the tower body manufacturing cost.

[0027] As shown in Figure 1 , in order to facilitate the third jumper wire to wind around the jumper wire, the lower side of the jumper wire support 14 of the transposition tower is provided with a third jumper wire insulator string 141 for jumper wire.

[0028] The lower end of the jumper wire insulator string is provided with a jumper wire support rod 3 for fixing the jumper wire, so as to better fix and support the corresponding jumper wire and ensure the space gap.

[0029] As shown in Figure 1 , in order to facilitate the connection of the power transmission line, one end of the second jumper wire insulator string 122 of the upper conductor cross arm 12 is provided with a strain insulator string 2 for connecting the power transmission line on both sides; the two ends of the lower conductor cross arm 13 are also provided with a strain insulator string 2 for connecting the power transmission line on both sides. As shown in Figure 2 , one end of the lower conductor cross arm 13 on one side of the first jumper wire insulator string 121 is provided with a fourth jumper wire insulator string 131 for jumper wire.

Claims

1. Single circuit transposition tower comprising a tower body (1), characterized in that: The tower body (1) is sequentially and spacedly provided with ground wire cross arms (11), upper conductor wire cross arms (12) and lower conductor wire cross arms (13) which are parallel to each other from bottom to top, the ground wire cross arms (11), the upper conductor wire cross arms (12) and the lower conductor wire cross arms (13) are symmetrically arranged relative to the tower body (1), the lengths of the ground wire cross arms (11), the upper conductor wire cross arms (12) and the lower conductor wire cross arms (13) increase sequentially, one side of the tower body (1) is provided with a jumper wire support (14) which is horizontally arranged, the jumper wire support (14) is in the same plane with the lower conductor wire cross arms (13), and there is an included angle between the jumper wire support (14) and the lower conductor wire cross arms (13), the upper conductor wire cross arms (12) are provided with a first jumper wire insulator string (121) which is hung below one end of the upper conductor wire cross arms (12), and are provided with a second jumper wire insulator string (122) which is hung below the other end of the upper conductor wire cross arms (12).

2. The monopole tower of claim 1, wherein: The included angle between the jumper wire support (14) and the lower conductor wire cross arms (13) is 90°.

3. The monopole tower of claim 1 wherein: The jumper wire support (14) is hung below and provided with a third jumper wire insulator string (141) which is used for jumpers.

4. The single circuit transposition tower of claim 1, wherein: The upper conductor wire cross arms (12) are provided with tension insulator strings (2) which are used for connecting power transmission lines and are arranged on both sides of one end of the upper conductor wire cross arms (12) where the second jumper wire insulator string (122) is arranged.

5. Single circuit transposition tower according to any of claims 1 to 4, characterized in that: The lower conductor wire cross arms (13) are also provided with tension insulator strings (2) which are used for connecting power transmission lines and are arranged on both sides of both ends of the lower conductor wire cross arms (13), and the lower conductor wire cross arms (13) are provided with a fourth jumper wire insulator string (131) which is hung at one end of the lower conductor wire cross arms (13) on one side of the first jumper wire insulator string (121).

6. Single loop transposition structure, characterized in that: The single circuit transposition tower comprises the single circuit transposition tower provided with the jumper wire support (14) according to any one of claims 1 to 5, one side of the jumper wire support (14) is provided with an output single circuit, and the other side of the jumper wire support (14) is provided with an input single circuit, wherein the input single circuit comprises A1 phase, B1 phase and C1 phase, and the output single circuit comprises A2 phase, B2 phase and C2 phase; The A1 phase and the C1 phase are connected to both ends of the lower conductor wire cross arms (13) through the tension insulator strings (2), wherein the A1 phase is arranged at one end of the lower conductor wire cross arms (13) which is close to the second jumper wire insulator string (122), the B1 phase is connected to one end of the upper conductor wire cross arms (12) where the second jumper wire insulator string (122) is arranged through the tension insulator string (2), the C2 phase is connected to one end of the lower conductor wire cross arms (13) where the A1 phase is arranged through the tension insulator string (2), the B2 phase is connected to one end of the lower conductor wire cross arms (13) where the C1 phase is arranged through the tension insulator string (2), and the A2 phase is connected to one end of the upper conductor wire cross arms (12) where the B1 phase is arranged through the tension insulator string (2); The A1 phase is provided with a first jumper wire (4) which is used for connecting the A2 phase, and the first jumper wire (4) is connected to the A2 phase through the second jumper wire insulator string (122); The B1 phase is provided with a second jumper wire (5) which is used for connecting the B2 phase, and the second jumper wire (5) is connected to the B2 phase through the first jumper wire insulator string (121); The C1 phase is provided with a third jumper wire (6) for connecting the C2 phase, the third jumper wire (6) is transversely introduced and connected with the C2 phase through the fourth jumper wire insulator string (131) hung below the lower conductor cross arm (13) and the third jumper wire insulator string (141) hung below the jumper wire support (14).

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