A cathead tower for power transmission lines suitable for tower positions with excessive swing angles

Abstract

The invention discloses a transmission line cathead tower suitable for a tower position with an over-limit swing angle, comprising: a tower body; and a tower window arranged on the tower body, wherein the tower window comprises: a middle phase cross arm arranged at the top of the tower window, a middle phase I string hanging point arranged on the middle phase cross arm, which is used to connect one end of a middle phase I type insulator string, and the other end is connected to a suspension connecting plate, and side phase cross arms symmetrically arranged on both sides of the tower window, middle phase inverted V string hanging points are arranged on the inner sides of the tower windows on the side phase cross arms on both sides, respectively, which are connected and connected to the suspension connecting plate through the middle phase inverted V type insulator string, and two side phase I string hanging points are also arranged on the outer sides of the tower windows on the side phase cross arms on both sides, respectively, which are used to connect one end of the side phase I type insulator string, and the other end is connected to the suspension connecting plate; and auxiliary cross arms on both sides are arranged, each of which is provided with two side phase inverted V string hanging points, which are connected and connected to the suspension connecting plate through the side phase inverted V type insulator string. By using the cathead tower of the invention, the size of the iron tower can be reduced and the engineering investment can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage power transmission lines, in particular to a power transmission line cathead tower suitable for a tower position with an over-limit swing angle. Background Art

[0002] Conventional single-circuit straight towers are generally divided into cathead-shaped straight towers and wine glass-shaped straight towers. Cathead-shaped straight towers occupy a smaller width of the power corridor. As the power corridor is becoming increasingly tight, cathead towers are currently used more frequently in single-circuit straight towers.

[0003] When conventional straight towers are used for transmission lines, suspension insulators I or V are used. The swing angle of I string is not restricted. When V string is subjected to large horizontal wind load, only one limb is stressed, and its swing principle is the same as that of I string. The swing angle is related to factors such as conductor parameters, wind speed, and the height difference between the tower and the adjacent tower. At present, in the design of transmission lines, after selecting a reasonable straight tower position, it is necessary to determine whether the swing angle of the tower meets the requirement of being less than the design limit swing angle of the iron tower.

[0004] In the design of power lines, in order to intuitively judge the swing angle level of the conductor insulator string and determine whether it exceeds the allowable maximum swing angle of the tower, the usual method is to judge the KV (conductor vertical load) coefficient of the tower. When the KV coefficient of the tower in actual use is not lower than the KV coefficient allowed when the tower was designed, it can be considered that the tower swing angle is within the limit.

[0005] When the swing angle of the suspension insulator string exceeds the maximum swing angle allowed by the tower, it will cause a line tripping accident. To avoid this situation during power operation, in the current transmission line design, the swing angle of the conductor suspension string is limited to not exceed the design allowable value. There are three conventional methods:

[0006] (1) Do not change the tower type, increase the tower height, increase the vertical span of the tower, increase LV (horizontal span), and increase the KV value. The increase in tower height leads to an increase in tower weight, resulting in an increase in investment.

[0007] (2) Replace the tower type and use a straight tower with a smaller allowable KV coefficient to meet the tower KV value requirements. Since the tower with a larger allowable limit swing angle will be larger in size, the tower weight will increase, resulting in increased investment.

[0008] (3) Replace the tension tower. When designing the tension tower, the tower can withstand the upward pull force and is not restricted by the swing angle. However, the tower weight, insulators, hardware strings, etc. need to be increased significantly, resulting in increased investment.

[0009] Pitch angle and KV coefficient concept:

[0010] When the number of conductor splits, conductor model, and insulator string type are determined, the swing angle φ of the suspension insulator string of the straight tower conductor is determined by the conductor parameters (N, G1, G4), insulator parameters (W1, W4), and straight tower use conditions (LH, LV). The swing angle can be calculated by the following formula:

[0011] Φ=tg -1 (N*GH*LH+WH / 2) / (N*GV*LV+WV / 2)

[0012] Where:

[0013] φ——Straight tower conductor suspension insulator string swing angle (°)

[0014] N——Number of split phase conductors

[0015] GV——Vertical load of conductor (N / m)

[0016] GH——Conductor wind pressure load (N / m)

[0017] WV——Insulator string gravity (N / m)

[0018] WH——Insulator string wind pressure (N / m)

[0019] LH——Horizontal span of straight tower (m)

[0020] LV——Horizontal span of straight tower (m)

[0021] Among them, the insulator parameters (WV, WH) have little effect on φ, and the influence of insulator parameters can be ignored. The swing angle φ and KV coefficient of the conductor suspension insulator string can be calculated according to the following formula:

[0022] (1)Φ=tg -1 (GH*LH / GV*LV)=tg -1 (GH / GV*KV)

[0023] (2) KV = LV / LH

[0024] Among them: GH-horizontal load of conductor; LH-horizontal span; GV-vertical load of conductor; LV-vertical span; The size of KV coefficient intuitively expresses the use conditions of the straight tower (LH, LV), and is directly related to the swing angle of the suspension insulator string of the straight tower conductor. If the actual KV value is too small, the general method is to increase the height of the tower or choose a tower type that allows a larger gap. The cost is to increase the tower weight to meet the electrical clearance requirements, and the project investment cost is also increased. Summary of the invention

[0025] The technical problem solved by the present invention is to provide a transmission line cathead tower suitable for towers with excessive swing angles, which is used in areas with low tower elevations such as mountainous areas. Under the same conditions as the design specifications, compared with traditional cathead towers, a new wire suspension method is adopted to limit the swing angle, thereby reducing the size of the tower window and tower head, saving tower weight and reducing foundation forces. Although the cost of some insulators and suspension fittings needs to be increased, it can still save engineering investment compared with the traditional solutions of increasing tower height or changing tower type.

[0026] The technical means adopted by the present invention are as follows:

[0027] A cathead tower for power transmission lines suitable for tower positions with excessive swing angles, characterized in that it comprises: a tower body; and a tower window arranged on the tower body, the tower window comprising: a middle phase cross arm, arranged at the top of the tower window, a middle phase I string hanging point on the middle phase cross arm, used to connect one end of the middle phase I type insulator string, the other end of the middle phase I type insulator string is connected with a suspension connecting plate, used to suspend the middle phase conductor, and a side phase cross arm, symmetrically arranged on both sides of the tower window, the inner sides of the tower windows on the side phase cross arms on both sides are respectively provided with a middle phase inverted V string hanging point, used to connect one end of the middle phase inverted V type insulator string, the middle phase inverted V type insulator The other end of the edge insulator string is connected to the suspension connecting plate connected to the middle phase I-type insulator string. Two side phase I-string hanging points are respectively arranged on the outer sides of the tower windows on the side phase crossarms on both sides, which are respectively used to connect one end of the side phase I-type insulator string. The other end of the side phase I-type insulator string is connected with a suspension connecting plate for hanging the side phase conductor; and auxiliary crossarms are respectively arranged on both sides of the tower body at the lower part of the tower window, and two side phase inverted V-string hanging points are arranged on the auxiliary crossarms on both sides, which are respectively used to connect the side phase inverted V-type insulator strings. The side phase inverted V-type insulator strings are connected to the suspension connecting plate connected to the side phase I-type insulator strings.

[0028] Preferably, the middle phase I string hanging point and the two middle phase inverted V string hanging points are arranged in a triangle on the tower window, and the suspension connecting plate commonly connected to the middle phase I type insulator string and the middle phase inverted V type insulator string is located in the triangle formed by the middle phase I string hanging point and the two middle phase inverted V string hanging points.

[0029] Preferably, the side phase I string hanging points on any side phase crossarm on both sides of the tower window and the two side phase inverted V string hanging points on the auxiliary crossarm on the corresponding side are arranged in a triangle, and the suspension connecting plate commonly connected to the side phase I type insulator string and the side phase inverted V type insulator string on any side is located in the triangle formed by the side phase I string hanging points on the corresponding side phase crossarm and the two side phase inverted V string hanging points on the auxiliary crossarm.

[0030] Among them, the triangle formed by the middle phase I string hanging point and the two middle phase inverted V string hanging points, and the triangle formed by the side phase I string hanging point and the two side phase inverted V string hanging points on the corresponding sides, the triangle here is preferably a right triangle or an acute triangle, and the most preferred is an isosceles or equilateral triangle. Acute triangles, especially isosceles or equilateral triangles, are better than right triangles. During the swinging process of the suspended connecting plate, the force on the I-type insulator string and the inverted V-type insulator is more uniform, and they can be repaired uniformly to prevent the insulator strings from breaking down one by one due to uneven force, increasing the maintenance cost. When the triangle is an obtuse triangle, the force will be more uneven, increasing the possibility of breaking down the insulator string with greater force.

[0031] But no matter which type of triangle it is, as long as the connection method of the I-type insulator string and the inverted V-type insulator string in the present invention is adopted, when the suspension connecting plate swings with the wind, the inverted V-type insulator string can provide pulling force in the upwind direction. When it is an obtuse triangle structure, it can also provide pulling force on one side in the upwind direction to reduce the burden of the I-type insulator string, thereby increasing the service life of the equipment.

[0032] Moreover, the connection method in which the I-type insulator string and the inverted V-type insulator string are jointly fixedly connected to the suspension link plate can better limit the swing amplitude of the suspension link plate, thereby limiting the swing amplitude of the conductor, reducing the risk of discharge of the conductor due to excessive swing angle, and is more practical, compared with the traditional connection of I-string or inverted V-string separately.

[0033] Preferably, an I-type connection point and two inverted V-type connection points are provided on the suspension connecting plate, the I-type connection point is used to connect the middle phase I-type insulator string or the side phase I-type insulator string, and the inverted V-type connection point is used to connect the middle phase inverted V-type insulator string or the side phase inverted V-type insulator string.

[0034] Further preferably, the I-type connection point and the two inverted V-shaped connection points on the tension link plate are arranged in a triangle, and the I-type connection point is located above the two inverted V-shaped connection points.

[0035] Preferably, the tension joint plate is also provided with a plurality of wire fixing parts, which can be used to directly suspend the wires, or external hardware is connected and provided at the wire fixing parts for fixing and suspending the wires.

[0036] The wire fixing part can be suspended at the bottom of the suspension link plate, and the wire fixing part can be annular or plate-shaped. The wire can be directly fixed on the wire fixing part by winding, or connecting hardware can be provided on both sides of the annular or plate-shaped wire fixing part, and tension clamps can be connected to fix the wire on both sides of the wire fixing part, so that the wire is suspended on the wire fixing part. In addition, the wire fixing part can also be plugged or welded on the suspension link plate, and the wire can also be suspended on the wire fixing part by winding or fixing with a tension clamp.

[0037] Preferably, the middle phase inverted V-type insulator string and the side phase inverted V-type insulator string both include an insulator, a first adjustment plate and a second adjustment plate, one end of the insulator is connected to the suspension connecting plate, and the other end is connected to one end of the first adjustment plate, the other end of the first adjustment plate is connected to one end of the second adjustment plate, and the other end of the second adjustment plate is connected to the middle phase inverted V-string hanging point or the side phase inverted V-string hanging point through a connecting fitting.

[0038] Further preferably, the first adjustment plate is a straight plate, and a plurality of first adjustment holes are arranged on the first adjustment plate; the second adjustment plate is fan-shaped or arc-shaped, and a connecting hole and a plurality of second adjustment holes are arranged on the second adjustment plate; the connecting hole is connected to the first adjustment hole, and the second adjustment hole is connected to the connecting hardware.

[0039] Among them, the structure of the middle phase inverted V-type insulator string and the side phase inverted V-type insulator string is the same, but the setting position is different. The middle phase inverted V-type insulator string is connected to the side phase crossarm, and the connected suspension connecting plate is used to suspend the middle phase conductor. The side phase inverted V-type insulator string is connected to the auxiliary crossarm, and the connected suspension connecting plate is used to suspend the side phase conductor.

[0040] Further preferably, the middle phase inverted V-shaped insulator string and the side phase inverted V-shaped insulator string can be extended or shortened by adjusting the connecting hole to connect to each first adjustment hole or adjusting the connecting fitting to connect to each second adjustment hole.

[0041] In addition, the middle phase I-type insulator string and the side phase I-type insulator string can be set in the form of a simple insulator connected to a suspended connecting plate, or can be set in the form of a middle phase inverted V-type insulator string and a side phase inverted V-type insulator string. The advantage is that, on the one hand, the length of the insulator string can be adjusted by adjusting the number of insulator pieces before installation; on the other hand, after being installed on the tower or after a period of use, it is inevitable that the insulator string will deviate. The position of each insulator string can be adjusted by connecting the first adjustment plate and the second adjustment plate to adapt to long-term use, thereby saving the cost of use.

[0042] Preferably, a ground wire bracket is provided on the middle phase cross arm, and the ground wire bracket is used for hanging the ground wire.

[0043] The beneficial effects of the present invention are as follows: the tower type can better meet the use in areas with lower tower elevations such as mountainous areas. Under the same design specifications, compared with the traditional cathead tower, a new wire suspension method is adopted to limit its swing angle, thereby reducing the size of the tower window and the tower head, saving tower weight and reducing foundation forces. Although the cost of some insulators and suspension fittings needs to be increased, it can still save engineering investment compared with the traditional solutions of increasing tower height or changing tower type. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the integral cat head tower of the present invention;

[0045] Figure 2 It is a structural schematic diagram of the type I insulator string of the present invention;

[0046] Figure 3 It is a schematic structural diagram of an inverted V-shaped insulator string of the present invention.

[0047] in:

[0048] 1 tower body, 2 tower window, 21 middle phase cross arm, 211 middle phase I string hanging point, 212 ground wire bracket, 23 side phase cross arm, 231 middle phase inverted V string hanging point, 232 side phase I string hanging point, 3 auxiliary cross arm, 31 side phase inverted V string hanging point, 4 middle phase I type insulator string, 5 middle phase inverted V type insulator string, 51 insulator, 52 first adjustment plate, 521 first adjustment hole, 53 second adjustment plate, 531 second adjustment hole, 532 connection hole, 6 side phase I type insulator string, 7 side phase inverted V type insulator string, 8 suspension connecting plate, 81 I type connection point, 82 inverted V type connection point, 83 wire fixing part. DETAILED DESCRIPTION

[0049] See also Figure 1-3 The present invention provides an embodiment of a cathead tower for a power transmission line suitable for a tower position with an excessive swing angle, comprising a tower body 1, a tower window 2 arranged at the upper part or the top of the tower body 1, the tower window 2 can be arranged in a square, circular or other window-like shape with an aperture in the middle, and the tower windows 2 are symmetrically distributed on both sides along the vertical line where the tower body 1 is located, and two auxiliary cross arms 3 are arranged on the left and right sides of the tower body 1 at the lower part of the tower window 2, the shape of the auxiliary cross arms 3 is also not limited, and can be a straight line or an arc, and it is optimal that the auxiliary cross arms 3 on both sides are also symmetrically distributed along the vertical line where the tower body 1 is located, so that the structure of the auxiliary cross arms 3 plus the tower window 2 will make the top of the entire iron tower present a cat head shape.

[0050] In one embodiment, the tower window 2 can be configured to consist of two parts, a middle phase cross arm 21 and a side phase cross arm 23. The middle phase cross arm 21 is configured at the top of the tower window 2, and the side phase cross arms 23 are symmetrically configured on both sides of the tower window 2. The maximum distance between the two side phase cross arms 23 is greater than the width of the tower body 1, so that the side phase cross arms 23 will protrude a portion relative to the tower body 1, just above the auxiliary cross arm 3.

[0051] In one embodiment, a middle phase I string hanging point 211 is provided on the middle phase cross arm 21, which is used to connect the middle phase I type insulator string 4, and the other end of the middle phase I type insulator string 4 is connected or suspended to a suspension link plate 8, which is used to suspend the middle phase conductor, and then a middle phase inverted V string hanging point 231 is respectively provided on the inner side of the tower window 2 of the side phase cross arms 23 on both sides, which is used to connect the middle phase inverted V type insulator string 5, wherein the middle phase inverted V type insulator string 5 is composed of two insulator strings, and the same structural sides of the two insulator strings are respectively connected to the two middle phase inverted V string hanging points 231 on the side phase cross arms 23 on both sides, and the other sides of the two insulator strings are commonly connected to the same suspension link plate 8, so that in one tower window 2, the middle phase inverted V type insulator string The two insulator strings 5 ​​can be connected together on the suspension link plate 8 connected to the middle phase I-type insulator string 4, so that a suspension link plate 8 can be fixed in the middle of the tower window 2 by the middle phase I-type insulator string 4 and the middle phase inverted V-type insulator string 5 at the same time, and in one embodiment, the vertical line where the middle phase I-string hanging point 211 is located is located between the two middle phase inverted V-string hanging points 231, and is preferably located in the middle position of the two middle phase inverted V-string hanging points 231, so that the suspension link plate 8 can be fixed in the middle position of the triangle formed by one middle phase I-string hanging point 211 and two middle phase inverted V-string hanging points 231, so that the force of each insulator string of the middle phase I-type insulator string 4 and the middle phase inverted V-type insulator string 5 is more uniform, thereby increasing the service life of the insulator string.

[0052] In one of the embodiments, the suspension link plate 8 in the tower window 2 is connected to the middle phase I-type insulator string 4 and the middle phase inverted V-type insulator string 5, that is, it is connected to the three insulator strings in three directions. Therefore, in one embodiment, three connection points are set on the suspension link plate 8, corresponding to the insulator strings connected in three directions respectively. An I-type connection point 81 can be set on the suspension link plate 8, corresponding to the position of the middle phase I-string hanging point 211, for connecting the middle phase I-type insulator string 4, and then two inverted V-shaped connection points 82 are set on both sides, corresponding to the two middle phase inverted V-string hanging points 231, for connecting the middle phase inverted V-type insulator string 5, and the I-type connection point 81 is above the two inverted V-shaped connection points 82, so that the suspension link plate 8 is fixed by a triangle and has greater stability.

[0053] In one embodiment, the suspension link plate 8 is also provided with a wire fixing portion 83 for hanging the wire. The wire fixing portion 83 can be arranged at the lower part of the suspension link plate 8, that is, as a component suspended on the suspension link plate 8 for hanging the wire. The wire fixing portion 83 can also be arranged on the suspension link plate 8, through a plate-like or ring-like structure, or plugged or welded on the suspension link plate 8, and can be only a single plate-like or ring-like structure, and then the wire is simply wrapped around the plate-like or ring-like structure, or it can be additionally provided with connecting hardware on the basis of the plate-like or ring-like structure, and connected with a complex structure of a tension clamp, and the wire is fixed and suspended on the wire fixing portion 83, and the plate-like or ring-like structure can be arranged on one side of the suspension link plate 8, or the plate-like or ring-like structure can be arranged on both sides of the suspension link plate 8, and then structures such as tension clamps are respectively arranged to fix and suspend the wire. The form is relatively flexible, and corresponding settings can be adopted according to different terrain and environmental requirements.

[0054] In one embodiment, any or each of the middle-phase I-type insulator string 4 or the middle-phase inverted V-type insulator string 5 can be connected to the suspension link plate 8 by the insulator directly, or an insulator 51, a first adjustment plate 52 and a second adjustment plate 53 can be respectively arranged on the insulator string, which can be used to adjust the length of the insulator string to meet different environmental or position requirements, wherein one end of the insulator 51 is fixedly connected to the tower window 2, and the other end is connected to one end of the first adjustment plate 52, and then the other end of the first adjustment plate 52 is connected to one end of the second adjustment plate 53, and the other end of the second adjustment plate 53 is connected to the suspension link plate 8, wherein the first adjustment plate 52 is connected to one end of the second adjustment plate 53, and the second adjustment plate 53 is connected to the suspension link plate 8, wherein the first adjustment plate 52 is connected to one end of the second adjustment plate 53, and the second adjustment plate 53 is connected to the suspension link plate 8. An adjustment plate 52 is a straight plate structure with a plurality of first adjustment holes 521 arranged thereon along the direction of the insulator string. A second adjustment plate 53 is a fan-shaped or arc-shaped structure with connection holes 532 and second adjustment plate holes 531 arranged thereon. The connection holes 532 are connected to the first adjustment holes 521, and the second adjustment plate holes 531 are connected to the suspension connecting plate 8 through connecting hardware. Therefore, the insulator string can be lengthened or shortened by adjusting the connection position of the connection holes 532 and each first adjustment hole 521 or adjusting the connection position of the connecting hardware and the second adjustment plate hole 531, thereby making the insulator string suitable for use in various installation environments and more applicable.

[0055] In one embodiment, side phase I string hanging points 232 are arranged on the outer sides of the tower windows 2 on the auxiliary cross arms 3 on the left and right sides, which are used to connect the side phase I type insulator string 6. The other end of the side phase I type insulator string 6 is also used to connect a suspension connecting plate 8. Two side phase inverted V string hanging points 31 are arranged on each side auxiliary cross arm 3 of the auxiliary cross arms 3 on both sides, which are used to connect the side phase inverted V type insulator string 7. In this way, on each side of the tower body 1, in the space formed by the auxiliary cross arm 3 and the corresponding side phase cross arm 23, the side phase I type insulator The string 6 and the side phase inverted V-type insulator string 7 can be connected to the same suspension link plate 8. Preferably, the vertical line where the side phase I string hanging point 232 is located is located in the middle of the two side phase inverted V-string hanging points 31 on the corresponding side auxiliary crossarm 3. The structure of the suspension link plate 8 connected to the side phase I-type insulator string 6 is the same as the suspension link plate 8 connected to the middle phase I-type insulator string 4. In this way, the suspension link plates 8 on both sides of the tower body 1 can be triangularly fixed by the side phase I-type insulator string 6 and the side phase inverted V-type insulator string 7, and are respectively used to fix the suspended side phase conductors.

[0056] Thus, in one embodiment, the entire cathead is divided into three areas, namely, the area where the tower window 2 is located, which is located at the top of the tower body 1, and the area composed of the auxiliary crossarms 3 and the corresponding side phase crossarms 23 on each side of the tower body 1, which are arranged on both sides of the tower body 1, and below the area where the tower window 2 is located. Insulator strings, suspension connecting plates 8 and other structures are arranged in each area to fix the middle phase conductor and the side phase conductor, and can well limit the swing angle of the conductor, and optimize the wear of the conductor and the loss of the insulator string, thereby improving the durability of the entire cathead tower.

[0057] In one embodiment, at least one ground wire bracket 212 is further provided on the middle phase cross arm for hanging a ground wire to protect the conductor.

[0058] Compared with the conventional single-circuit cathead iron tower, this tower type has two auxiliary cross arms 3 on the lower layer and three hanging points for each phase conductor. Each phase conductor adopts the technical means of hanging I-type insulator string and inverted V insulator string to limit the swing of the conductor insulator string, so that the electrical clearance of the tower head always meets the design requirements, and can meet the original tower heightening or tower position requirements of selecting a larger extreme swing angle tower type. The cathead tower designed by the present invention can reduce the size of the iron tower, reduce the foundation force, and reduce the investment in the transmission line project.

Claims

1. A cathead tower for power transmission lines suitable for tower positions with excessive swing angles, characterized in that: include: Tower body (1); and a tower window (2) arranged on the tower body (1), the tower window (2) comprising: a middle phase cross arm (21) disposed at the top of the tower window (2); a middle phase I string hanging point (211) is provided on the middle phase cross arm (21) for connecting one end of a middle phase I type insulator string (4); the other end of the middle phase I type insulator string (4) is connected to a suspension connecting plate (8) for suspending a middle phase conductor; and Side phase cross arms (23) are symmetrically arranged on both sides of the tower window (2); the inner sides of the tower windows (2) on the side phase cross arms (23) on both sides are respectively provided with middle phase inverted V-string hanging points (231) for connecting one end of the middle phase inverted V-type insulator string (5); the other end of the middle phase inverted V-type insulator string (5) is connected to the suspension connecting plate (8) connected to the middle phase I-type insulator string (4); the outer sides of the tower windows (2) on the side phase cross arms (23) on both sides are also respectively provided with two side phase I-string hanging points (232) for connecting one end of the side phase I-type insulator string (6); the other end of the side phase I-type insulator string (6) is connected to the suspension connecting plate (8) for suspending side phase conductors; Auxiliary cross arms (3) are respectively arranged on both sides of the tower body (1) arranged at the lower part of the tower window (2), and two side phase inverted V-string hanging points (31) are respectively arranged on the auxiliary cross arms (3) on both sides, which are used to connect the side phase inverted V-type insulator strings (7), and the side phase inverted V-type insulator strings (7) are connected to the suspension connecting plate (8) connected to the side phase I-type insulator strings (6); The suspension connecting plate (8) is provided with an I-type connection point (81) and two inverted V-type connection points (82), the I-type connection point (81) being used to connect the middle phase I-type insulator string (4) or the side phase I-type insulator string (6), and the inverted V-type connection point (82) being used to connect the middle phase inverted V-type insulator string (5) or the side phase inverted V-type insulator string (7); The suspended connecting plate (8) is a tension connecting plate, the I-shaped connecting point (81) and the two inverted V-shaped connecting points (82) on the suspended connecting plate (8) are arranged in a triangle, and the I-shaped connecting point (81) is located above the two inverted V-shaped connecting points (82); The suspension connecting plate (8) is also provided with a plurality of wire fixing parts (83), and connecting hardware is provided on both sides of the wire fixing parts (83), and tension clamps are connected, so that the wires are fixed on both sides of the wire fixing parts (83), and the wires are suspended on the wire fixing parts (83).

2. A cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 1, characterized in that: The middle phase I string hanging point (211) and the two middle phase inverted V string hanging points (231) are arranged in a triangle on the tower window (2), and the suspension connecting plate (8) to which the middle phase I type insulator string (4) and the middle phase inverted V type insulator string (5) are commonly connected is located in the triangle formed by the middle phase I string hanging point (211) and the two middle phase inverted V string hanging points (231).

3. A cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 1, characterized in that: The side phase I string hanging point (232) on the side phase cross arm (23) on either side of the tower window (2) and the two side phase inverted V string hanging points (31) on the auxiliary cross arm (3) on the corresponding side are arranged in a triangle, and the suspension connecting plate (8) commonly connected to the side phase I type insulator string (6) and the side phase inverted V type insulator string (7) on either side is located in the triangle formed by the side phase I string hanging point (232) on the side phase cross arm (23) on the corresponding side and the two side phase inverted V string hanging points (31) on the auxiliary cross arm (3).

4. The cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 1, characterized in that: The middle phase inverted V-shaped insulator string (5) and the side phase inverted V-shaped insulator string (7) both comprise an insulator (51), a first adjustment plate (52) and a second adjustment plate (53); one end of the insulator (51) is connected to the suspension link plate (8), and the other end is connected to one end of the first adjustment plate (52); the other end of the first adjustment plate (52) is connected to one end of the second adjustment plate (53); and the other end of the second adjustment plate (53) is connected to the middle phase inverted V-shaped string hanging point (231) or the side phase inverted V-shaped string hanging point (31) via a connecting fitting.

5. A cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 4, characterized in that: The first adjustment plate (52) is in the shape of a straight plate, and is provided with a plurality of first adjustment holes (521); the second adjustment plate (53) is in the shape of a fan or an arc, and is provided with a connection hole (532) and a plurality of second adjustment holes (531); the connection hole (532) is connected to the first adjustment hole (521), and the second adjustment hole (531) is connected to a connection fitting, and is further connected to the suspension connecting plate (8).

6. A cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 5, characterized in that: By adjusting the connection hole (532) to connect to each of the first adjustment holes (521) or adjusting the connection fittings to connect to each of the second adjustment holes (531), the middle phase inverted V-shaped insulator string (5) and the side phase inverted V-shaped insulator string (7) can be extended or shortened.

7. The cathead tower for power transmission lines suitable for over-limit sway angle tower positions according to claim 1, characterized in that: A ground wire bracket (212) is provided on the middle phase cross arm (21), and the ground wire bracket (212) is used for hanging a ground wire.

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