CN113374330A - Transmission line cat head tower suitable for it exceeds limit tower position to sway angle - Google Patents

Abstract

The invention relates to a transmission line cat-head tower suitable for a swing angle overrun tower position, which comprises: a tower body; and set up the tower window on the body of the tower, the tower window includes: the middle phase cross arm is arranged at the top end of the tower window, the middle phase cross arm is provided with a middle phase I string hanging point for connecting one end of a middle phase I type insulator string, the other end of the middle phase I string hanging point is connected with a suspension connecting plate, the side phase cross arms are symmetrically arranged at two sides of the tower window, the inner sides of the tower windows on the two side phase cross arms are respectively provided with a middle phase inverted V string hanging point, the middle phase inverted V string hanging points are connected with the suspension connecting plate and connected with the suspension connecting plate through the middle phase inverted V type insulator string, the outer sides of the tower windows on the two side phase cross arms are respectively provided with two side phase I string hanging points which are respectively used for connecting one end of the side phase I type insulator string, and the other end of the tower window is connected with the suspension connecting plate; and the cat-head tower is provided with the auxiliary cross arms at two sides, and is provided with two side-inverted-V string hanging points which are connected and connected with the suspension connecting plate through side-inverted-V insulator strings.

Description

Transmission line cat head tower suitable for it exceeds limit tower position to sway angle

Technical Field

The invention relates to the technical field of high-voltage transmission lines, in particular to a cat-head tower of a transmission line, which is suitable for a swing angle overrun tower position.

Background

The conventional single-circuit tangent tower of the circuit is generally divided into a cat-head tangent tower and a wine-cup tangent tower, the cat-head tangent tower occupies smaller width of a power corridor, and the cat-head tangent tower is more used at present along with the increasing tension of the power corridor at present.

When the conventional tangent tower of the power transmission line is used, the suspension insulator I string or the suspension insulator V string is used, the swing angle of the I string is not limited, and only one limb of the V string bears the force after the V string bears a large horizontal wind load, and the swing principle of the V string is the same as that of the I string. The size of the swing angle is related to factors such as wire parameters, wind speed, height difference between the tower and the adjacent tower and the like. At present, in the design of a power transmission line, after a reasonable linear tower position is selected, whether the swing angle of the tower meets the requirement that the swing angle is smaller than the design limit of the iron tower needs to be judged.

In the design of a power line, generally, in order to intuitively judge the swing angle level of a lead insulator string and judge whether the swing angle level exceeds an allowed iron tower limit swing angle, a general method is to judge the KV (lead vertical load) coefficient of the tower, and when the KV coefficient in actual use of the iron tower is not lower than the allowed KV coefficient in design of the iron tower, the swing angle of the iron tower can be considered not to exceed the limit.

When the suspension insulator string exceeds the allowable limit swing angle of the tower at the swing angle, a line trip accident can be caused. To avoid this in power operation, in the current transmission line design, the swing angle of the wire suspension string is limited not to exceed the design allowable value, and there are three conventional methods:

(1) the tower type is not changed, the tower height is increased, the vertical span of the tower is increased, the LV (horizontal span) is increased, and the KV value is increased. The increase in the tower height leads to an increase in the tower weight, resulting in an increase in investment.

(2) And replacing the tower type, and adopting a tangent tower with a smaller design allowable KV coefficient to meet the requirement of the KV value of the iron tower. Due to the adoption of the iron tower with a larger allowable limit swing angle, the size of the iron tower is larger, the weight of the iron tower is increased, and the investment is increased.

(3) When the tension tower is replaced, the tension tower can bear pull-up force without being limited by a swing angle when being designed, but the tower weight, the insulator, the hardware string and the like of the tension tower need to be increased more, so that the investment is increased.

Pitch angle and KV coefficient concept:

when the number of the wire splits, the type of the wire and the type of the insulator string are all determined, the swing angle phi of the tangent tower wire suspension insulator string is determined by wire parameters (N, G1, G4), insulator parameters (W1, W4) and tangent tower use conditions (LH, LV), and the swing angle can be calculated by the following formula:

Φ＝tg^-1(N*GH*LH+WH/2)/(N*GV*LV+WV/2)

in the formula:

phi-swing angle (degree) of tangent tower conductor suspension insulator string

Number of split N-phase conductors

GV-wire vertical specific load (N/m)

GH-wire wind pressure specific load (N/m)

WV-insulator chain gravity (N/m)

WH-insulator string wind pressure (N/m)

LH-tangent tower horizontal span (m)

LV-tangent tower horizontal span (m)

The influence of insulator parameters (WV and WH) on phi is small, the influence of the insulator parameters can be ignored, and the swing angles phi and KV coefficients of the wire suspension insulator string can be calculated according to the following formula:

(1)Φ＝tg^-1(GH*LH/GV*LV)＝tg^-1(GH/GV*KV)

(2)KV＝LV/LH

wherein: GH-lead horizontal loading; LH-horizontal span; GV-wire vertical loading; LV-vertical span; the magnitude of the KV coefficient intuitively expresses the use conditions (LH, LV) of the tangent tower, and is directly related to the swing angle of the lead suspension insulator string of the tangent tower, if the actual KV value is too small, the generally adopted method is to improve the height of the tangent tower or select a tower type allowing larger clearance, the cost is to meet the requirement of electric clearance by increasing the tower weight, and the engineering investment cost is further increased.

Disclosure of Invention

The technical problem solved by the invention is to provide a cat-head tower suitable for a transmission line with an over-limit swing angle tower position, which is used in areas with lower tower position height, such as mountainous areas and the like, and under the condition of meeting design rules, compared with the traditional cat-head tower, a brand-new wire suspension mode is adopted to limit the swing angle of the cat-head tower, so that the sizes of a tower window and a tower head of an iron tower are reduced, the tower weight is saved, the foundation acting force is reduced, and although part of cost of insulators and suspension fittings needs to be increased, the total scheme of increasing the tower height or replacing the tower shape can still save the engineering investment compared with the traditional scheme.

The technical means adopted by the invention are as follows,

the utility model provides a transmission line cat head tower suitable for it exceeds limit tower position to sway angle which characterized in that includes: a tower body; and set up the tower window on the body of the tower, the tower window includes: the middle phase cross arm is arranged at the top end of the tower window, a middle phase I string hanging point is arranged on the middle phase cross arm and is used for connecting one end of a middle phase I type insulator string, the other end of the middle phase I type insulator string is connected with a suspension connecting plate and is used for suspending a middle phase lead, the side phase cross arms are symmetrically arranged at two sides of the tower window, middle phase inverted V string hanging points are respectively arranged at the inner sides of the tower windows on the side phase cross arms at two sides and are used for connecting one end of the middle phase inverted V type insulator string, the other end of the middle phase inverted V type insulator string is connected with the suspension connecting plate connected with the middle phase I type insulator string, two side phase I string hanging points are respectively arranged at the outer sides of the tower windows on the side phase cross arms at two sides and are respectively used for connecting one end of the side phase I type insulator string, and the other end of the side phase I type insulator string is connected with the suspension connecting plate and is used for suspending a side phase lead; and auxiliary cross arms are arranged on two sides of the tower body at the lower part of the tower window respectively, two side-phase inverted V-shaped string hanging points are arranged on the auxiliary cross arms on the two sides and are respectively used for connecting side-phase inverted V-shaped insulator strings, and the side-phase inverted V-shaped insulator strings are connected with the suspension connecting plate connected with the side-phase I-shaped insulator strings.

Preferably, the middle-phase I string hanging points and the two middle-phase inverted V string hanging points are arranged on the tower window in a triangular mode, and the suspension connecting plate connected with the middle-phase I-shaped insulator string and the middle-phase inverted V-shaped insulator string together is located in the triangle formed by the middle-phase I string hanging points and the two middle-phase inverted V string hanging points.

Preferably, the I string hanging points of the side phase on any side of the side phase cross arm on two sides of the tower window and the inverted V string hanging points of the two sides of the auxiliary cross arm on the corresponding side are arranged in a triangle, and the suspension connecting plate connected with the I type insulator string of the side phase and the inverted V type insulator string of the side phase together is positioned in the triangle formed by the I string hanging points of the side phase on the corresponding side phase cross arm and the inverted V string hanging points of the two sides of the auxiliary cross arm.

The suspension connection plate is characterized in that a triangle formed by middle-phase I string hanging points and two middle-phase inverted V string hanging points and a triangle formed by side-phase I string hanging points and two side-phase inverted V string hanging points of the corresponding side are preferably right-angled triangles or acute-angled triangles, most preferably isosceles or equilateral triangles, the acute-angled triangles are particularly more right-angled triangles or isosceles or equilateral triangles, in the swinging process of the suspension connection plate, the stress of the I-shaped insulator string and the inverted V-shaped insulators is more uniform, the uniform maintenance can be realized, the insulator strings are prevented from being damaged in sequence due to uneven stress, the maintenance cost is increased, when the triangle is an obtuse-angled triangle, the stress is more nonuniform, and the possibility that the insulator string which is stressed greatly is damaged is increased.

However, no matter which triangle is adopted, as long as the connection mode of the I-shaped insulator string and the inverted V-shaped insulator string in the invention is adopted, when the suspension connecting plate swings with wind, the inverted V-shaped insulator string can provide tension in the upwind direction, and when the suspension connecting plate is in an obtuse-angle triangle structure, the tension in the upwind direction can be provided on one side, so that the burden of the I-shaped insulator string is reduced, and the service life of the equipment can be prolonged.

And the connection mode that I type insulator chain and the connection of falling V type insulator chain are common fixed connection and hang the yoke plate, traditional I cluster or the connection alone of falling V cluster relatively, the swing range of the yoke plate that hangs that can be better restriction to the range of swaying of restriction wire has reduced the wire and has caused the risk of discharging because of the angle of swaying is too limit, but more has the practicality.

Preferably, the suspension connecting plate is provided with an I-shaped connecting point and two inverted V-shaped connecting points, the I-shaped connecting point is used for connecting the middle-phase I-shaped insulator string or the side-phase I-shaped insulator string, and the inverted V-shaped connecting point is used for connecting the middle-phase inverted V-shaped insulator string or the side-phase inverted V-shaped insulator string.

Further preferably, the I-shaped connection point and the two inverted V-shaped connection points on the tension yoke plate are arranged in a triangular shape, and the I-shaped connection point is positioned at the upper parts of the two inverted V-shaped connection points.

Preferably, the tension yoke plate is further provided with a plurality of wire fixing parts for directly suspending the wires, or an external hardware fitting is connected and arranged at the wire fixing parts for fixing and suspending the wires.

This wire fixed part can hang the bottom that sets up at the yoke plate that dangles, and this wire fixed part can be cyclic annular or platelike, the wire can be through winding mode snap-on the wire fixed part, also can set up the connection gold utensil in the both sides of cyclic annular or platelike wire fixed part, and connect the strain clamp, thereby it is fixed with the wire in the both sides of wire fixed part, thereby hang the wire on the wire fixed part, in addition the wire fixed part also can be pegging graft or weld on the yoke plate that dangles, also can adopt the winding fixed or hang the wire on the wire fixed part through the fixed mode of strain clamp simultaneously.

Preferably, the middle inverted-V-shaped insulator string and the side inverted-V-shaped insulator string both comprise insulators, first adjusting plates and second adjusting plates, one ends of the insulators are connected with the suspension connecting plates, the other ends of the insulators are connected with one ends of the first adjusting plates, the other ends of the first adjusting plates are connected with one ends of the second adjusting plates, and the other ends of the second adjusting plates are connected with the middle inverted-V-shaped string hanging points or the side inverted-V-shaped string hanging points through connecting hardware fittings.

Preferably, the first adjusting plate is in a straight plate shape, a plurality of first adjusting holes are formed in the first adjusting plate, the second adjusting plate is in a fan shape or an arc shape, a connecting hole and a plurality of second adjusting holes are formed in the second adjusting plate, the connecting hole is connected with the first adjusting hole, and the second adjusting holes are connected with the connecting hardware fitting.

The middle-phase inverted-V-shaped insulator string and the side-phase inverted-V-shaped insulator string are identical in structure and are different in setting position, the middle-phase inverted-V-shaped insulator string is connected to the side-phase cross arm, the connected suspension connecting plate is used for suspending a middle phase lead, the side-phase inverted-V-shaped insulator string is connected to the auxiliary cross arm, and the connected suspension connecting plate is used for suspending a side phase lead.

Preferably, the middle inverted V-shaped insulator string and the side inverted V-shaped insulator string can be extended or shortened by connecting the adjusting connecting holes to the first adjusting holes or connecting the adjusting connecting fittings to the second adjusting holes.

In addition, well looks I type insulator chain and limit looks I type insulator chain can set up the form that a simple insulator connects the yoke plate that dangles, also can set up the form of similar well type of falling V insulator chain and limit looks type of falling V insulator chain, the benefit lies in, can adjust the length of insulator chain through the number of adjusting the insulator piece before the installation on the one hand, on the other hand after installing on the iron tower, or after using for a period of time, it can deviate to avoid insulator chain to take place for a long time, then can adjust the position of each insulator chain through the connected mode of first regulating plate and second regulating plate, in order to adapt to long-time use, and then practice thrift use cost.

Preferably, the middle-phase cross arm is provided with a ground wire bracket, and the ground wire bracket is used for suspending a ground wire.

The invention has the beneficial effects that: the tower type can be used in areas with lower tower height such as mountainous areas, and the like, and compared with the traditional cat-head tower, the tower type can adopt a brand-new wire suspension mode to limit the swing angle of the cat-head tower under the condition of also meeting design rules, so that the sizes of the tower window and the tower head of the iron tower are reduced, the tower weight is saved, the foundation acting force is reduced, and although part of the cost of insulators and suspension hardware fittings needs to be increased, the engineering investment can still be saved by the scheme of generally increasing the tower height or replacing the tower type compared with the traditional scheme.

Drawings

FIG. 1 is a schematic structural view of an integral cat-head tower of the present invention;

FIG. 2 is a schematic structural diagram of an I-shaped insulator string according to the present invention;

fig. 3 is a schematic structural diagram of the inverted V-shaped insulator string of the present invention.

Wherein:

1 tower body, 2 tower windows, 21 middle phase cross arms, 211 middle phase I string hanging points, 212 ground wire supports, 23 side phase cross arms, 231 middle phase inverted V string hanging points, 232 side phase I string hanging points, 3 auxiliary cross arms, 31 side inverted V string hanging points, 4 middle phase I type insulator strings, 5 middle phase inverted V type insulator strings, 51 insulators, 52 first adjusting plates, 521 first adjusting holes, 53 second adjusting plates, second adjusting holes, 532 connecting holes 531, 6 side phase I type insulator strings, 7 side inverted V type insulator strings, 8 suspension connecting plates, 81I type connecting points, 82 inverted V type connecting points and 83 lead fixing parts.

Detailed Description

Referring to fig. 1-3, the present invention provides an embodiment of a cat-head tower for a power transmission line with a swing angle exceeding a limit tower position, including a tower body 1, wherein a tower window 2 is arranged at the upper part or the top of the tower body 1, the tower window 2 can be set to be square, round or other shapes with a caliber in the middle of the window, the tower windows 2 are symmetrically distributed at two sides along a vertical line where the tower body 1 is located, and two auxiliary cross arms 3 are arranged at 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 linear or arc, and most preferably, the auxiliary cross arms 3 at two 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 and the tower window 2 can make the top of the whole tower present the shape of a cat head.

In one embodiment, the tower window 2 may be configured as two parts, namely a middle phase cross arm 21 and a side phase cross arm 23, the middle phase cross arm 21 is disposed at the topmost part of the tower window 2, the side phase cross arms 23 are symmetrically disposed at two sides of the tower window 2, and 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 arm 23 will protrude a part relative to the tower body 1 just above the auxiliary cross arm 3.

In one embodiment, the middle phase cross arm 21 is provided with a middle phase I string hanging point 211 for connecting a middle phase I type insulator string 4, the other end of the middle phase I type insulator string 4 is connected or hung and connected with a suspension connection plate 8 for hanging a middle phase conductor, then the inner sides of the tower windows 2 of the two side phase cross arms 23 are respectively provided with a middle inverted V string hanging point 231 for connecting middle inverted V type insulator strings 5, wherein the middle inverted V type insulator string 5 is composed of two insulator strings, the same structure sides of the two insulator strings are respectively connected with the two middle inverted V string hanging points 231 on the two side phase cross arms 23, and the other sides of the two insulator strings are connected with the same suspension connection plate 8, so that in one tower window 2, the two insulator strings of the middle inverted V type insulator string 5 can be connected with the suspension connection plate 8 connected with the middle phase I type insulator string 4, such a suspension link plate 8 can be fixed in the middle of tower window 2 by well phase I type insulator chain 4 and well reverse V type insulator chain 5 simultaneously, and in one embodiment, the vertical line that well phase I cluster hangs the point 211 place is located between two well reverse V cluster and hangs the point 231, and the optimum is in the most intermediate position of two well reverse V cluster and hang the point 231, can make suspension link plate 8 fix the intermediate position of the triangle-shaped that well phase I cluster hangs the point 211 and two well reverse V cluster and hang the point 231 and constitute like this to make well phase I type insulator chain 4 and well reverse V type insulator chain 5's each insulator chain's atress more even, increase insulator chain's life.

In one embodiment, the suspension link plate 8 in the tower window 2 is connected by the common connection of the middle phase I-shaped insulator string 4 and the middle phase inverted V-shaped insulator string 5, that is, the three insulator strings are connected in three directions, so in one embodiment, three connection points are provided on the suspension link plate 8, and the three insulator strings are connected in three directions respectively, an I-shaped connection point 81 can be provided on the suspension link plate 8, corresponding to the position of the middle phase I-shaped string hanging point 211, for connecting the middle phase I-shaped insulator string 4, and then two inverted V-shaped connection points 82 are provided on two sides, corresponding to the two middle phase inverted V-shaped string hanging points 231, for connecting the middle phase inverted V-shaped insulator string 5, and the I-shaped connection point 81 is above the two inverted V-shaped connection points 82, so that the suspension link plate 8 is fixed in a triangular shape, and has more stability.

In one embodiment, the suspension yoke plate 8 is further provided with a wire fixing portion 83 for suspending a wire, the wire fixing portion 83 may be provided at a lower portion of the suspension yoke plate 8, that is, as a component for suspending a wire from the suspension yoke plate 8, the wire fixing portion 83 may be provided at the suspension yoke plate 8, may be formed by a plate-like or ring-like structure, or may be formed by inserting or welding the wire onto the suspension yoke plate 8, and may be formed by only a single plate-like or ring-like structure, and then simply winding the wire onto the plate-like or ring-like structure, or may be formed by additionally providing a coupling fitting on the plate-like or ring-like structure, and connecting a complex structure of strain clamps, and fixing and suspending the wire onto the wire fixing portion 83, and the plate-like or ring-like structure may be provided at one side of the suspension yoke plate 8, or may be provided at both sides of the suspension yoke plate 8, then be provided with strain clamp isotructure respectively, fixedly hang the wire, the form is more nimble, can have adopted corresponding mode of setting according to the topography that the difference has required.

In one embodiment, either one or each of the middle phase I-shaped insulator string 4 or the middle phase inverted V-shaped insulator string 5 may be directly connected to the suspension link plate 8 through an insulator, or an insulator 51, a first adjusting plate 52 and a second adjusting plate 53 may be respectively disposed on the insulator string, and may be used to adjust the length of the insulator string to use different environmental or position requirements, wherein one end of the insulator 51 is fixedly connected to the tower window 2, the other end is connected to one end of the first adjusting plate 52, then the other end of the first adjusting plate 52 is connected to one end of the second adjusting plate 53, and the other end of the second adjusting plate 53 is connected to the suspension link plate 8, wherein the first adjusting plate 52 is a straight plate structure, and a plurality of first adjusting holes 521 are disposed thereon along the direction of the insulator string, the second adjusting plate 53 is a fan-shaped or arc-shaped structure, and a connecting hole 532 and a second adjusting plate hole 531 are disposed thereon, connecting hole 532 is connected with first regulation hole 521, and second regulation hole 531 is connected on the yoke plate 8 that dangles through link fitting, consequently can realize the extension of insulator chain and shorten through adjustment connecting hole 532 and each first regulation hole 521 hookup location or adjustment link fitting and second regulation hole 531's hookup location, and then make this kind of insulator chain can use various installation environment, have more the adaptability.

In one embodiment, the outer sides of the tower windows 2 on the left and right auxiliary cross arms 3 are provided with side phase I string hanging points 232 for connecting side phase I type insulator strings 6, the other ends of the side phase I type insulator strings 6 are also used for connecting a suspension connecting plate 8, each side auxiliary cross arm 3 of the two auxiliary cross arms 3 is provided with two side phase inverted V string hanging points 31 for connecting the side phase inverted V type insulator strings 7, so that each side of the tower body 1 is provided with a space formed by the auxiliary cross arm 3 and the corresponding side phase cross arm 23, the side phase I type insulator strings 6 and the side phase inverted V type insulator strings 7 can be connected to the same suspension connecting plate 8, preferably, the vertical line where the side phase I string hanging points 232 are located is located in the middle of the two side phase inverted V string hanging points 31 on the corresponding side auxiliary cross arm 3, the suspension connecting plate 8 connected by the side phase I type insulator strings 6 is the same as the suspension connecting plate 8 connected by the middle phase I type insulator string 4, thus, the suspension connecting plates 8 on the two sides of the tower body 1 can be fixed by the side phase I-shaped insulator string 6 and the side phase inverted V-shaped insulator string 7 in a triangular mode and are respectively used for fixing and suspending side phase wires.

Thus, in one embodiment, the whole cat head is divided into three regions, namely a region where the tower window 2 is located, the three regions are located at the top of the tower body 1, the region consisting of the auxiliary cross arm 3 on each side of the two sides of the tower body 1 and the side phase cross arm 23 corresponding to the side is arranged on the two sides of the tower body 1 in a dividing mode, and the insulator string, the suspension connecting plate 8 and other structures are arranged in each region to fix the middle phase conductor and the side phase conductor, so that the swinging angle of the conductors can be well limited, the problems of abrasion of the conductors and loss of the insulator string are optimized, and the durability of the whole cat head tower is improved.

In one embodiment, at least one ground bracket 212 is also provided on the middle cross arm for suspending ground wires to protect the wires.

Compared with a conventional single-loop cat-head iron tower, the tower type has the advantages that the left auxiliary cross arm 3 and the right auxiliary cross arm 3 on the lower layer are added, three hanging points are arranged for each phase of lead, each phase of lead adopts a technical means of hanging an I-shaped insulator string and an inverted V-shaped insulator string, the swing of the lead insulator string is limited, the electric clearance of the tower head always meets the design requirement, and the tower position requirement that the original tower needs to be heightened or a tower type with a larger limit swing angle is selected can be met. The cat-head tower designed by the invention can reduce the size of the iron tower, reduce the foundation acting force and reduce the investment of the transmission line engineering.

Claims (10)

1. The utility model provides a transmission line cat head tower suitable for it exceeds limit tower position to sway angle which characterized in that includes:

a tower body (1);

and set up in tower window (2) on body of the tower (1), tower window (2) include:

well looks cross arm (21), set up in the top of tower window (2), well looks cross arm (21) are gone up and are had well looks I string hanging point (211) for connect the one end of well looks I type insulator chain (4), the other end of well looks I type insulator chain (4) is connected with linking plate (8) that dangles, is used for hanging well looks wire, and

the side phase cross arms (23) are symmetrically arranged on two sides of the tower window (2), the inner sides of the tower window (2) on the side phase cross arms (23) on the two sides are respectively provided with a middle inverted V string hanging point (231) for connecting one end of a middle inverted V-shaped insulator string (5), the other end of the middle inverted V-shaped insulator string (5) is connected with the suspension connecting plate (8) connected with the middle I-shaped insulator string (4), the outer sides of the tower window (2) on the side phase cross arms (23) on the two sides are respectively provided with two side phase I string hanging points (232) for connecting one end of a side phase I-shaped insulator string (6), and the other end of the side phase I-shaped insulator string (6) is connected with the suspension connecting plate (8) for suspending a side phase lead;

and the two sides of the tower body (1) at the lower part of the tower window (2) are respectively provided with an auxiliary cross arm (3), the two sides of the auxiliary cross arm (3) are respectively provided with two side phase inverted V-shaped string hanging points (31) which are respectively used for connecting side phase inverted V-shaped insulator strings (7), and the side phase inverted V-shaped insulator strings (7) are connected with the side phase I-shaped insulator strings (6) through the suspension connecting plates (8).

2. The power transmission line cat-head tower suitable for the swing angle overrun tower position is characterized in that the middle phase I string hanging point (211) and the two middle phase inverted V string hanging points (231) are arranged on the tower window (2) in a triangular mode, and the suspension connecting plate (8) which is jointly connected with the middle phase I-shaped insulator string (4) and the middle phase inverted V-shaped insulator string (5) 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. The power transmission line cat-head tower suitable for the swing angle overrun tower position is characterized in that the side phase I string hanging point (232) on the side phase cross arm (23) on any one 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) which is jointly connected with the side phase I type insulator string (6) and the side phase inverted V type insulator string (7) on any one side is positioned in a 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 power transmission line cat-head tower suitable for the swing angle overrun tower position is characterized in that an I-shaped connection point (81) and two inverted V-shaped connection points (82) are arranged on the suspension yoke plate (8), the I-shaped connection point (81) is used for connecting the middle phase I-shaped insulator string (4) or the side phase I-shaped insulator string (6), and the inverted V-shaped connection point (82) is used for connecting the middle phase inverted V-shaped insulator string (5) or the side phase inverted V-shaped insulator string (7).

5. The power transmission line cat-head tower suitable for the swing angle overrun tower position as claimed in claim 4, wherein the I-shaped connection point (81) and the two inverted V-shaped connection points (82) on the tension yoke plate are arranged in a triangular shape, and the I-shaped connection point (81) is located at the upper part of the two inverted V-shaped connection points (82).

6. The power transmission line cat-head tower suitable for the swing angle overrun tower position as claimed in claim 1, wherein the tension yoke plate is further provided with a plurality of wire fixing parts (83) for directly suspending the wires, or an external fitting is connected and arranged at the wire fixing parts (83) for fixing and suspending the wires.

7. The power transmission line cat-head tower suitable for the swing angle overrun tower position is characterized in that the middle-phase inverted-V-shaped insulator string (5) and the side-phase inverted-V-shaped insulator string (7) respectively comprise an insulator (51), a first adjusting plate (52) and a second adjusting plate (53), one end of the insulator (51) is connected with the suspension connecting plate (8), the other end of the insulator is connected with one end of the first adjusting plate (52), the other end of the first adjusting plate (52) is connected with one end of the second adjusting plate (53), and the other end of the second adjusting plate (53) is connected with the middle-phase inverted-V string hanging point (231) or the side-phase inverted-V string hanging point (31) through a connecting fitting.

8. The power transmission line cat-head tower suitable for the swing angle overrun tower position as claimed in claim 7, wherein the first adjusting plate (52) is in a straight plate shape, a plurality of first adjusting holes (521) are formed in the first adjusting plate (52), the second adjusting plate (53) is in a fan shape or an arc shape, a connecting hole (532) and a plurality of second adjusting holes (531) are formed in the second adjusting plate (53), the connecting hole (532) is connected with the first adjusting hole (521), and the second adjusting holes (531) are connected with a connecting fitting and further connected with the suspension connecting plate (8).

9. The power transmission line cat-head tower suitable for the swing angle overrun tower is characterized in that the middle inverted-V-shaped insulator string (5) and the side inverted-V-shaped insulator string (7) can be lengthened or shortened by adjusting the connection holes (532) to be connected to the first adjusting holes (521) or adjusting the connection fittings to be connected to the second adjusting holes (531).

10. The power transmission line cat-head tower suitable for the swing angle overrun tower is characterized in that the middle phase cross arm (21) is provided with a ground wire bracket (212), and the ground wire bracket (212) is used for suspending a ground wire.

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