A high-voltage cable tower arrangement structure

Abstract

The present invention discloses a high-voltage cable tower arrangement structure in the technical field of upper tower system structures. The high-voltage cable tower arrangement structure of the present invention utilizes service installation flanges and spare installation flanges that are vertically spaced in the middle of the outer wall of the iron tower pole body. Among them, the service installation flanges are used in the current period, and the spare installation flanges are used when the wire terminal fails and needs to be remade. When the wire terminal fails, rapid repair can be carried out, and the underground space occupied by the cable coiling area can be avoided, and investment can be saved; in addition, by setting support insulators with different orientations, on the premise that the aluminum-clad steel core bare wire meets the discharge gap requirements, the force transmission mechanism of the bracket is simpler and the space utilization is more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of the upper tower system structure, and particularly to an arrangement structure of high-voltage cables on the upper tower. Background Art

[0002] To meet the requirements of urban beautification and land use, high-voltage overhead transmission lines generally need to be cable-laid underground after entering the urban area. The cable connection points of high-voltage overhead transmission lines need to be transitioned using cable terminals. One end of the cable terminal is connected to the aluminum-clad steel core bare conductor that changes from horizontal to vertical lead-down, and the other end is connected to the high-voltage cable and extends into the ground.

[0003] When arranging the vertically lead-down aluminum-clad steel core bare conductors, the discharge gap requirements between the phase conductors should be met. At the same time, the cable terminal is the main fault point of the transmission line. When a fault occurs in the cable terminal, a certain length of remaining cable, generally 3m, is required to remake the cable terminal. Currently, the following several methods are mainly adopted: One is that the three-phase aluminum-clad steel core bare conductors of each circuit are located in the same vertical plane, and the horizontal spacing between the phase aluminum-clad steel core bare conductors is increased to meet the discharge gap requirements; the other is to set an arc-shaped cable coiling area near the cable terminal tower, that is, the current cable is laid along the arc edge. When a fault occurs in the cable terminal, the cable is changed to be laid in a straight line, and the remaining cable obtained by shortening the path is used to remake the cable terminal. However, the deficiencies of the above solutions are as follows:

[0004] 1. Meeting the discharge gap requirements by increasing the horizontal spacing between the phase aluminum-clad steel core bare conductors, especially for high-voltage transmission lines of 110 kV and above, will result in a relatively large length of the brackets for fixing the support insulators, increasing the amount of steel used and occupying more space.

[0005] 2. When a fault occurs in the cable terminal, in order to have enough remaining cable length to remake the cable terminal, the diameter of the approximately circular cable coiling area is relatively large, and it is difficult to find enough space to set up the cable coiling area in some suburban areas of the city. At the same time, when a fault occurs in the cable terminal, construction operations such as cable re-laying need to be carried out inside the cable coiling area, and the effect of rapid repair cannot be achieved.

[0006] Patent CN105298201A "Three-dimensional Lead-down Device for Cable Terminals of Transmission Lines" also realizes the three-dimensional lead-down of the aluminum-clad steel core bare conductors of double-circuit cable terminals by setting three-layer conductor crossarms with gradually changing planar azimuth angles. However, the deficiencies of this method are that the phase aluminum-clad steel core bare conductors are still located in the same horizontal plane, and the length of the brackets for support insulators is relatively large to meet the gap requirements. At the same time, the length of the conductor crossarm needs to be increased to ensure the gap requirements between the horizontal aluminum-clad steel core bare conductors and the tower pole body. Secondly, the conductor crossarm cannot be used as the support insulator crossarm.

[0007] Based on this, the present invention designs an arrangement structure of high-voltage cables on the upper tower to solve the above problems. Summary of the Invention

[0008] The object of the invention is to provide a high-voltage cable tower arrangement structure to solve the above technical problems.

[0009] To achieve the above object, the invention provides the following technical solution: A high-voltage cable tower arrangement structure includes a tower pole body. On the upper part of the outer wall of the tower pole body, a ground wire cross arm, an A-phase conductor cross arm, a B-phase conductor cross arm, a C-phase conductor cross arm, and an insulator cross arm are sequentially arranged at intervals from top to bottom; at the left and right ends of the ground wire cross arm, a double-circuit ground wire, A-phase conductor, B-phase conductor, and C-phase conductor are respectively connected correspondingly;

[0010] Strain insulator strings are arranged behind both ends of the ground wire cross arm;

[0011] Strain insulator strings are arranged behind both ends of the A-phase conductor cross arm; jumper insulators are arranged below;

[0012] Strain insulator strings are arranged behind both ends of the B-phase conductor cross arm; jumper insulators are arranged below; support insulators are arranged in front;

[0013] Strain insulator strings are arranged behind both ends of the C-phase conductor cross arm; jumper insulators are arranged below; support insulators are arranged in front and on the side;

[0014] Jumper insulators are arranged below both ends of the insulator cross arm; support insulators are arranged in front, behind, and on the side;

[0015] The ground wire is connected to the strain insulator string and then reversely grounded;

[0016] The A-phase conductor is connected to the A-phase conductor terminal after passing through the strain insulator string of the A-phase conductor cross arm, the front support insulator of the B-phase conductor cross arm, the front support insulator of the C-phase conductor cross arm, and the front support insulator of the insulator cross arm;

[0017] The B-phase conductor is connected to the B-phase conductor terminal after passing through the strain insulator string of the B-phase conductor cross arm, the side support insulator of the C-phase conductor cross arm, and the side support insulator of the insulator cross arm;

[0018] The C-phase conductor is connected to the C-phase conductor terminal after passing through the strain insulator string of the C-phase conductor cross arm and the rear support insulator of the insulator cross arm;

[0019] In the middle of the outer wall of the iron tower pole, an active installation flange and a spare installation flange are arranged at intervals up and down. A wire terminal platform is erected on the active installation flange through a connecting platform cross arm. The A-phase wire terminal, B-phase wire terminal, and C-phase wire terminal are respectively installed on the wire terminal platform and are respectively connected to the A-phase cable, B-phase cable, and C-phase cable.

[0020] Preferably, the platform cross arm is arranged in a left-right symmetric V shape in the horizontal plane. The wire terminal platform includes operation platform plates symmetrically distributed left and right, wire terminal mounting seat connecting channels, and lightning arrester mounting seat connecting channels. Three groups of wire terminal mounting seats and lightning arrester mounting seats are respectively arranged at intervals on the wire terminal mounting seat connecting channels and lightning arrester mounting seat connecting channels.

[0021] Preferably, the three groups of wire terminal mounting seats are respectively used to install the A-phase wire terminal, B-phase wire terminal, and C-phase wire terminal; three groups of lightning arresters respectively associated with the A-phase wire, B-phase wire, and C-phase wire are respectively installed on the three groups of lightning arrester mounting seats.

[0022] Preferably, several groups of cable support cross arms are arranged at intervals up and down at the lower part of the outer wall of the iron tower pole. Cable support rods are respectively arranged at both ends of each group of cable support cross arms. The A-phase cable, B-phase cable, and C-phase cable are horizontally and spaced apart and fixed on the cable support rods.

[0023] Preferably, lifting lugs are respectively arranged at the inner and outer ends of the platform cross arm.

[0024] Preferably, a fiberglass gasket is arranged between the top surface of the platform cross arm and the bottom surface of the wire terminal platform. The fiberglass gasket is connected by non-magnetic stainless steel bolts to avoid forming an electromagnetic loop.

[0025] Preferably, the installation height of the spare installation flange is not lower than the safety distance from the A-phase wire terminal, B-phase wire terminal, or C-phase wire terminal to the ground.

[0026] Preferably, the height difference between the active installation flange and the spare installation flange is not less than the cable length required for remanufacturing in case of failure of the A-phase wire terminal, B-phase wire terminal, or C-phase wire terminal.

[0027] Preferably, the iron tower pole is a straight electric welding steel pipe formed by bending a steel plate into a regular dodecagon, and the inscribed circle radius of its bottom is larger than the inscribed circle radius of its top.

[0028] Compared with the prior art, the beneficial effects of the invention are:

[0029] The tower layout structure of the high-voltage cable of the present invention utilizes the active installation flange and the standby installation flange which are arranged at intervals up and down in the middle of the outer wall of the iron tower pole body. When a fault occurs at the wire terminal, rapid repair can be carried out, and the occupation of underground space by the cable coiling area can be avoided, and the investment can be saved. At the same time, by setting the wire support insulators with different orientations, on the premise of meeting the discharge gap requirements, the force transmission mechanism of the bracket is simpler and the space utilization is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the invention, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts.

[0031] Figure 1 It is a front structure schematic diagram of the present invention;

[0032] Figure 2 It is a side structure schematic diagram of the present invention;

[0033] Figure 3 It is a structure schematic diagram of the wire terminal platform of the present invention;

[0034] Figure 4 It is a three-dimensional structure schematic diagram of the wire laying method of the present invention;

[0035] Figure 5 It is a three-dimensional structure schematic diagram of the ground wire laying method of the present invention;

[0036] Figure 6 It is a three-dimensional structure schematic diagram of the A-phase wire laying method of the present invention;

[0037] Figure 7 It is a three-dimensional structure schematic diagram of the B-phase wire laying method of the present invention;

[0038] Figure 8 It is a three-dimensional structure schematic diagram of the C-phase wire laying method of the present invention;

[0039] Figure 9 It is a top view structure schematic diagram of the ground wire cross arm of the present invention;

[0040] Figure 10 It is a top view structure schematic diagram of the A-phase cross arm of the present invention;

[0041] Figure 11 It is a top view structure schematic diagram of the B-phase cross arm of the present invention;

[0042] Figure 12 It is a top view structure schematic diagram of the C-phase cross arm of the present invention.

[0043] In the drawings, the list of components represented by each reference numeral is as follows:

[0044] 1 - Tower pole body, 2 - Earth wire cross arm, 3 - Phase A conductor cross arm, 4 - Phase B conductor cross arm, 5 - Phase C conductor cross arm, 6 - Insulator cross arm, 7 - Strain insulator string, 8 - Jump wire insulator, 9 - Support insulator, 10 - 1 - Phase A conductor terminal, 10 - 2 - Phase B conductor terminal, 10 - 3 - Phase C conductor terminal, 11 - Existing installation flange, 12 - Spare installation flange, 13 - Platform cross arm, 14 - Conductor terminal platform, 15 - 1 - Phase A cable, 15 - 2 - Phase B cable, 15 - 3 - Phase C cable, 16 - Operation platform board, 17 - Conductor terminal mounting seat connecting channel steel, 18 - Lightning arrester mounting seat connecting channel steel, 19 - Conductor terminal mounting seat, 20 - Lightning arrester mounting seat, 21 - Lightning arrester, 22 - Cable support cross arm, 23 - Cable support pole, 24 - Lifting lug, 25 - Fiberglass gasket strip. Specific implementation manner

[0045] Next, the technical solutions in the embodiments of the invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the invention.

[0046] Please refer to Figures 1-12 , the invention provides a technical solution:

[0047] Embodiment 1:

[0048] A high - voltage cable tower arrangement structure, including a tower pole body 1, the tower pole body 1 is a straight electric - welded steel pipe formed by bending a steel plate into a regular dodecagon, and the radius of the inscribed circle at its bottom is greater than the radius of the inscribed circle at the top; on the upper part of the outer wall of the tower pole body 1, an earth wire cross arm 2, a Phase A conductor cross arm 3, a Phase B conductor cross arm 4, a Phase C conductor cross arm 5 and an insulator cross arm 6 are sequentially arranged at intervals from top to bottom; the left and right ends of the earth wire cross arm 2, the Phase A conductor cross arm 3, the Phase B conductor cross arm 4 and the Phase C conductor cross arm 5 are respectively connected to double - circuit earth wires, Phase A conductors, Phase B conductors and Phase C conductors, and the Phase A conductors, Phase B conductors and Phase C conductors are aluminum - clad steel - core bare conductors;

[0049] As Figures 4-12 ,

[0050] Behind the two ends of the earth wire cross arm 2, a strain insulator string 7 is arranged;

[0051] Behind the two ends of the Phase A conductor cross arm 3, a strain insulator string 7 is arranged; a jump wire insulator 8 is arranged below;

[0052] Behind both ends of the cross arm 4 of the B-phase conductor, strain insulators 7 are provided; below, jumper insulators 8 are provided; in front, support insulators 9 are provided.

[0053] Behind both ends of the cross arm 5 of the C-phase conductor, strain insulators 7 are provided; below, jumper insulators 8 are provided; in front and on the side, support insulators 9 are provided.

[0054] Below both ends of the insulator cross arm 6, jumper insulators 8 are provided; in front, behind and on the side, support insulators 9 are provided.

[0055] The ground wire is connected to the strain insulator string 7 and then reversely grounded.

[0056] The A-phase conductor is connected to the A-phase conductor terminal 10-1 via the strain insulator string 7 of the A-phase conductor cross arm 3, the front support insulator 9 of the B-phase conductor cross arm 4, the front support insulator 9 of the C-phase conductor cross arm 5, and the front support insulator 9 of the insulator cross arm 6;

[0057] The B-phase conductor is connected to the B-phase conductor terminal 10-2 via the strain insulator string 7 of the B-phase conductor cross arm 4, the side support insulator 9 of the C-phase conductor cross arm 5, and the side support insulator 9 of the insulator cross arm 6;

[0058] The C-phase conductor is connected to the C-phase conductor terminal 10-3 via the strain insulator string 7 of the C-phase conductor cross arm 5 and the rear support insulator 9 of the insulator cross arm 6.

[0059] The A-phase conductor cross arm 3, the B-phase conductor cross arm 4 and the C-phase conductor cross arm 5 are straight-seam electric welded steel pipes bent from steel plates. On the inner side, flanges are provided and connected to the outer wall flange of the iron tower pole body 1 by bolts. On the outer side, strain insulator strings 7 and jumper insulators 8 are provided, and head plates are provided at the ends.

[0060] The inner side of the support insulator 9 is connected to each cross arm by bolts, and the outer side clamps each aluminum-clad steel core bare conductor by a fixed clamp.

[0061] By setting support insulators with different orientations, on the premise that the aluminum-clad steel core bare conductor meets the discharge gap requirements, the force transmission mechanism of the bracket is simpler and the space utilization is more compact.

[0062] Embodiment 2

[0063] On the basis of Embodiment 1, as Figures 1-3As shown in the figure, on the middle part of the outer wall of the iron tower pole 1, the active installation flange 11 and the spare installation flange 12 are arranged at intervals up and down. On the active installation flange 11, a conductor terminal platform 14 is erected after passing through the connecting platform cross arm 13. The platform cross arm 13 is arranged in a left-right symmetric V shape in the horizontal plane. The outer ends of the active installation flange 11 and the spare installation flange 12 are provided with flange plates with a plurality of bolt holes, and the normal direction of the flange plate plane is parallel to the axial direction of the platform cross arm 13. The inner sides of the active installation flange 11 and the spare installation flange 12 are welded to the iron tower pole 1 through square steel pipes and stiffening ribs.

[0064] The conductor terminal platform 14 includes operation platform plates 16 symmetrically distributed left and right, conductor terminal mounting seat connecting channel steels 17, and lightning arrester mounting seat connecting channel steels 18. The operation platform plates 16 are used for personnel to stand during operation. On the conductor terminal mounting seat connecting channel steels 17 and the lightning arrester mounting seat connecting channel steels 18, three groups of conductor terminal mounting seats 19 and lightning arrester mounting seats 20 are respectively arranged at intervals. The A-phase conductor terminal 10-1, B-phase conductor terminal 10-2, and C-phase conductor terminal 10-3 are respectively installed on the conductor terminal platform 14 and are respectively connected to the A-phase cable 15-1, B-phase cable 15-2, and C-phase cable 15-3. Further, the three groups of conductor terminal mounting seats 19 are respectively used for installing the A-phase conductor terminal 10-1, B-phase conductor terminal 10-2, and C-phase conductor terminal 10-3. Three groups of lightning arresters 21 respectively associated with the A-phase conductor, B-phase conductor, and C-phase conductor are respectively installed on the three groups of lightning arrester mounting seats 20.

[0065] Lifting lugs 24 are respectively arranged at both the inner and outer ends of the platform cross arm 13, which are used to lift the conductor terminal platform 14 and the platform cross arm 13 when lowering and transferring the installation of the conductor terminal platform 14.

[0066] A fiberglass gasket 25 is arranged between the top surface of the platform cross arm 13 and the bottom surface of the conductor terminal platform 14. The fiberglass gasket 25 is connected by non-magnetic stainless steel bolts to avoid forming an electromagnetic loop.

[0067] The installation height of the spare installation flange 12 is not lower than the safety distance from the ground of the A-phase conductor terminal 10-1, B-phase conductor terminal 10-2, or C-phase conductor terminal 10-3. The height difference between the active installation flange 11 and the spare installation flange 12 is not less than the cable length required for remanufacturing in case of failure of the A-phase conductor terminal 10-1, B-phase conductor terminal 10-2, or C-phase conductor terminal 10-3 (usually taken as 3.0 m).

[0068] By arranging an active installation flange and a spare installation flange at intervals up and down in the middle of the outer wall of the iron tower pole body, where the active installation flange 11 is used in this period. Additionally, when a fault occurs at the conductor terminal and needs to be remade, the platform cross arm 13 is transferred from the active installation flange 11 and installed to be connected with the spare installation flange 12, so that the conductor terminal platform 14 descends to the same height as the spare installation flange 12. The extra cable lengths of the phase A cable 15-1, phase B cable 15-2, and phase C cable 15-3 can be used to remake the conductor end, realizing the function of rapid repair, avoiding the occupation of underground space by the cable coiling area, and saving investment.

[0069] In the description of the invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the invention.

[0070] In the invention, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0071] Although the embodiments of the invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-voltage cable tower arrangement structure, characterized in that: It includes an iron tower pole body (1). On the upper part of the outer wall of the iron tower pole body (1), a ground wire cross arm (2), an A-phase conductor cross arm (3), a B-phase conductor cross arm (4), a C-phase conductor cross arm (5), and an insulator cross arm (6) are sequentially arranged at intervals from top to bottom. At the left and right ends of the ground wire cross arm (2), the A-phase conductor cross arm (3), the B-phase conductor cross arm (4), and the C-phase conductor cross arm (5), double-circuit ground wires, A-phase conductors, B-phase conductors, and C-phase conductors are respectively connected correspondingly. Strain insulator strings (7) are arranged behind both ends of the ground wire cross arm (2). Strain insulator strings (7) are arranged behind both ends of the A-phase conductor cross arm (3). A jumper insulator (8) is arranged below. Strain insulator strings (7) are arranged behind both ends of the B-phase conductor cross arm (4). A jumper insulator (8) is arranged below. A support insulator (9) is arranged in front. Strain insulator strings (7) are arranged behind both ends of the C-phase conductor cross arm (5). A jumper insulator (8) is arranged below. Support insulators (9) are arranged in front and on the side. Jumper insulators (8) are arranged below both ends of the insulator cross arm (6). Support insulators (9) are arranged in front, behind, and on the side. The ground wire is connected to the strain insulator string (7) and then changes direction to be grounded. The A-phase conductor is connected to the A-phase conductor terminal (10-1) after passing through the strain insulator string (7) of the A-phase conductor cross arm (3), the front support insulator (9) of the B-phase conductor cross arm (4), the front support insulator (9) of the C-phase conductor cross arm (5), and the front support insulator (9) of the insulator cross arm (6). The B-phase conductor is connected to the B-phase conductor terminal (10-2) after passing through the strain insulator string (7) of the B-phase conductor cross arm (4), the side support insulator (9) of the C-phase conductor cross arm (5), and the side support insulator (9) of the insulator cross arm (6). The C-phase conductor is connected to the C-phase conductor terminal (10-3) after passing through the strain insulator string (7) of the C-phase conductor cross arm (5) and the rear support insulator (9) of the insulator cross arm (6). Active installation flanges (11) and spare installation flanges (12) are arranged at intervals up and down in the middle of the outer wall of the iron tower pole body (1). A conductor terminal platform (14) is erected on the active installation flange (11) through a connecting platform cross arm (13). The A-phase conductor terminal (10-1), the B-phase conductor terminal (10-2), and the C-phase conductor terminal (10-3) are respectively installed on the conductor terminal platform (14) and are respectively connected to an A-phase cable (15-1), a B-phase cable (15-2), and a C-phase cable (15-3). The platform cross arm (13) is arranged in a left-right symmetric V shape in the horizontal plane. The wire terminal platform (14) includes operation platform plates (16) symmetrically distributed left and right, wire terminal mounting seat connecting channel steels (17), and lightning arrester mounting seat connecting channel steels (18). Three groups of wire terminal mounting seats (19) and lightning arrester mounting seats (20) are respectively arranged at intervals on the wire terminal mounting seat connecting channel steel (17) and the lightning arrester mounting seat connecting channel steel (18). Several groups of cable support cross arms (22) are arranged at intervals up and down on the outer wall of the lower part of the iron tower pole body (1). Cable support rods (23) are respectively arranged at both ends of each group of cable support cross arms (22). The A-phase cable (15-1), B-phase cable (15-2), and C-phase cable (15-3) are horizontally and spacedly distributed and fixed on the cable support rods (23).

2. The high-voltage cable tower arrangement structure according to claim 1, wherein: The three groups of wire terminal mounting seats (19) are respectively used to install the A-phase wire terminal (10-1), B-phase wire terminal (10-2), and C-phase wire terminal (10-3). Three groups of lightning arresters (21) respectively associated with the A-phase wire, B-phase wire, and C-phase wire are respectively installed on the three groups of lightning arrester mounting seats (20).

3. The high-voltage cable tower layout structure according to claim 1, wherein: Lifting lugs (24) are respectively arranged at the inner and outer ends of the platform cross arm (13).

4. A high-voltage cable tower arrangement structure according to claim 1, characterized in that: A fiberglass gasket (25) is arranged between the top surface of the platform cross arm (13) and the bottom surface of the wire terminal platform (14). The fiberglass gasket (25) is connected by degaussing stainless steel bolts to avoid forming an electromagnetic loop.

5. A high-voltage cable tower arrangement structure according to claim 1, characterized in that: The installation height of the spare installation flange (12) is not lower than the safety distance from the A-phase wire terminal (10-1), B-phase wire terminal (10-2), or C-phase wire terminal (10-3) to the ground.

6. The high-voltage cable tower arrangement structure according to claim 1, characterized in that: The height difference between the active installation flange (11) and the spare installation flange (12) is not less than the cable length required for remanufacturing in case of failure of the A-phase wire terminal (10-1), B-phase wire terminal (10-2), or C-phase wire terminal (10-3).

7. A high-voltage cable tower arrangement structure according to claim 1, characterized in that: The iron tower pole body (1) is a straight electric welding steel pipe bent from a steel plate into a regular dodecagon, and the inner inscribed circle radius of its bottom is greater than that of its top.

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