Same-tower double-circuit transposition tower and power transmission line

Abstract

The utility model discloses a same-tower double-circuit transposition tower and a power transmission line, and relates to the technical field of power transmission lines, and the same-tower double-circuit transposition tower comprises an iron tower which is provided with a power generation side close to a photovoltaic base and a power grid side back to the photovoltaic base; the multiple cross beams are sequentially arranged on the iron tower from top to bottom, and each cross beam is provided with an input end close to the power generation side and an output end close to the power grid side; the same-tower double-circuit transposition tower is provided with a first wiring side and a second wiring side, and the two ends of each cross beam are located on the first wiring side and the second wiring side respectively; on the first wiring side, a high-voltage line connected to the input end of one cross beam is connected in series with the output end of the other cross beam; on the second wiring side, the high-voltage line connected to the input end of one cross beam is connected in series with the output end of the other cross beam; and at least one group of input ends and output ends which are connected in series are respectively arranged in the first wiring side and the second wiring side and are positioned on two different cross beams. According to the technical scheme provided by the utility model, the problem that the three-phase voltage of the same-tower double-circuit line is unbalanced can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission lines, in particular to a same-tower double-circuit transposition tower and a power transmission line. Background Art

[0002] The world energy landscape has undergone significant changes. Against the backdrop of energy transformation, China's renewable energy development has accelerated. Since the Shagohuang New Energy Base was proposed in 2021, it finally entered the implementation stage in 2023. By the end of 2023, the first batch of my country's large-scale wind power and photovoltaic bases have been built and connected to the grid, and the second and third batches have been approved and started construction. From the first, second, and third batches of national-level wind and solar bases to the Shagohuang base, to the integrated water, wind, and solar base, and the coal mining subsidence area base, the national-level large base planning has reached 455 million kilowatts.

[0003] Large-scale base power transmission generally adopts double-circuit or multi-circuit transmission lines on the same tower due to cost factors. For double-circuit lines on the same tower, the asymmetry of the three-phase parameters of each line and the electromagnetic coupling relationship between the lines make the line unbalanced more than the single-circuit line; in recent years, the three-phase voltage imbalance caused by such lines has become increasingly prominent. Due to the restrictions of the transmission corridor, transmission lines are mostly erected on the same tower with double or multi-circuit. The imbalance of mutual inductance and mutual capacitance between the circuits has a great impact on the three-phase voltage imbalance. As a result, when the line is operating normally, the three-phase voltage and current are unbalanced, causing the inverter protection to be disconnected from the grid or threatening the safe operation of the power grid. Therefore, solving the three-phase voltage imbalance problem of double-circuit lines on the same tower is of great significance to the safe and stable operation of the power grid. Utility Model Content

[0004] The main purpose of the utility model is to provide a double-circuit transposition tower and a transmission line on the same tower, aiming to solve the problem of three-phase voltage imbalance of the double-circuit line on the same tower.

[0005] To achieve the above-mentioned purpose, the utility model proposes a same-tower double-circuit transposition tower, which comprises: an iron tower, the iron tower having a power generation side close to a photovoltaic base and a grid side facing away from the photovoltaic base; and a plurality of crossbeams, the plurality of crossbeams are sequentially arranged on the iron tower from top to bottom, each of the crossbeams having an input end close to the power generation side and an output end close to the grid side; the same-tower double-circuit transposition tower has a first wiring side and a second wiring side respectively located on opposite sides of the iron tower, and the two ends of each of the crossbeams are respectively located on the first wiring side and the second wiring side;

[0006] On the first connection side, a high-voltage line connected to the input end of at least one of the beams is connected in series to the output end of another beam;

[0007] On the second connection side, the high-voltage line connected to the input end of at least one of the beams is connected in series to the output end of another beam;

[0008] At least one set of the input end and the output end connected in series on the first wiring side and the second wiring side is located on two different beams.

[0009] In one embodiment, the plurality of beams include an upper beam, a middle beam and a lower beam, and at the first wiring side, the input end of the upper beam is connected in series with the output end of the lower beam, the input end of the middle beam is connected in series with the output end of the upper beam, and the input end of the lower beam is connected in series with the output end of the middle beam;

[0010] On the second wiring side, the input end of the upper beam is connected in series with the output end of the middle beam, the input end of the middle beam is connected in series with the output end of the lower beam, and the input end of the lower beam is connected in series with the output end of the upper beam.

[0011] In one embodiment, the plurality of beams include an upper beam, a middle beam and a lower beam, and on the first connection side, the input end of the upper beam is connected in series with the output end of the upper beam, the input end of the middle beam is connected in series with the output end of the lower beam, and the input end of the lower beam is connected in series with the output end of the middle beam;

[0012] On the second connection side, the input end of the upper beam is connected in series with the output end of the middle beam, the input end of the middle beam is connected in series with the output end of the upper beam, and the input end of the lower beam is connected in series with the output end of the lower beam.

[0013] In one embodiment, the plurality of beams include an upper beam, a middle beam and a lower beam, and on the first connection side, the input end of the upper beam is connected in series with the output end of the upper beam, the input end of the middle beam is connected in series with the output end of the lower beam, and the input end of the lower beam is connected in series with the output end of the middle beam;

[0014] On the second wiring side, the input end of the upper beam is connected in series with the output end of the lower beam, the input end of the middle beam is connected in series with the output end of the middle beam, and the input end of the lower beam is connected in series with the output end of the upper beam.

[0015] In one embodiment, the plurality of beams include an upper beam, a middle beam and a lower beam, and at the first wiring side, the input end of the upper beam is connected in series with the output end of the middle beam, the input end of the middle beam is connected in series with the output end of the upper beam, and the input end of the lower beam is connected in series with the output end of the lower beam;

[0016] On the second wiring side, the input end of the upper beam is connected in series with the output end of the lower beam, the input end of the middle beam is connected in series with the output end of the middle beam, and the input end of the lower beam is connected in series with the output end of the upper beam.

[0017] In one embodiment, the double-circuit transposition tower on the same tower comprises a lead wire, and each of the input ends and each of the output ends are connected in series through the lead wire.

[0018] In one embodiment, the plurality of beams include a ground beam, and the ground beam is located at the top of the tower.

[0019] In one embodiment, the double-circuit transposition tower on the same tower includes a tension insulator, and each of the input ends and each of the output ends are electrically insulated and fixed to the iron tower through the tension insulator.

[0020] In one embodiment, the double-circuit transposition tower on the same tower includes a hanging insulator and a supporting insulator. When the input end and the output end of each two beams are connected in series through the lead wire, the hanging insulator and the supporting insulator electrically insulate and fix the lead wire and the iron tower.

[0021] The utility model also proposes a transmission line, which comprises: at least one double-circuit transposition tower on the same tower; at least one straight tower; at least one tension tower; and multiple sections of transmission conductors, wherein each of the straight towers, each of the tension towers and each of the double-circuit transposition towers on the same tower are sequentially connected in series through the multiple sections of the transmission conductors.

[0022] The technical solution of the utility model is to set the double-circuit transposition tower on the same tower into two independent transmission circuits. On a single circuit, the wire connected to the input end of at least one beam is connected in series to the output end of another beam, so that the phase sequence on the circuit changes; at the same time, the wire connected to the input end of at least one beam on another circuit is connected in series to the output end of another beam, and the phase sequence transformation arrangement on both sides is inconsistent. Thereby reducing the electromagnetic interference between the circuits, balancing the distribution of current in each phase conductor, reducing the voltage imbalance caused by current imbalance, and the phase change operation can adjust the phase according to the actual load conditions to adapt to different load requirements and reduce the impact of load imbalance on the voltage level. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of an embodiment of a same-tower double-circuit transposition tower provided by the utility model;

[0025] Figure 2A schematic structural diagram of an embodiment of a double-circuit transposition tower in the same tower provided by the utility model;

[0026] Figure 3 A schematic structural diagram of another embodiment of a double-circuit transposition tower in the same tower provided by the utility model;

[0027] Figure 4 A schematic structural diagram of another embodiment of a double-circuit transposition tower in the same tower provided by the utility model;

[0028] Figure 5 The present invention provides a schematic structural diagram of another embodiment of a double-circuit transposition tower in the same tower.

[0029] Description of Figure Numbers:

[0030] 100. Double-circuit transposition tower on the same tower; 1. Iron tower; 2. Cross beam; 21. Upper cross beam; 22. Middle cross beam; 23. Lower cross beam; 24. Ground wire cross beam; 2a. First connection side; 2b. Second connection side; 3. Lead wire; 4. Tension insulator; 5. Suspension insulator; 6. Post insulator.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides a same-tower double-circuit transposition tower 100.

[0036] See also Figure 1 The double-circuit transposition tower 100 on the same tower comprises: an iron tower 1, the iron tower 1 having a power generation side close to the photovoltaic base and a grid side facing away from the photovoltaic base; and a plurality of beams 2, the plurality of beams 2 being arranged on the iron tower 1 in sequence from top to bottom, each beam 2 having an input end close to the power generation side and an output end close to the grid side; the double-circuit transposition tower 100 on the same tower comprises a first wiring side 2a and a second wiring side 2b respectively located on opposite sides of the iron tower 1, and two ends of each beam 2 are respectively located on the first wiring side 2a and the second wiring side 2b; on the first wiring side 2a, a high-voltage line connected to the input end of at least one beam 2 is connected in series with the output end of another beam 2; on the second wiring side 2b, a high-voltage line connected to the input end of at least one beam 2 is connected in series with the output end of another beam 2; and there is at least one set of input ends and output ends connected in series on different beams in the first wiring side 2a and the second wiring side 2b.

[0037] In the embodiment of the utility model, the iron tower 1 is generally made of steel or aluminum alloy. The steel has high strength and good toughness and can withstand large loads and wind. The steel iron tower 1 is usually made of steel components of different shapes such as angle steel, channel steel, steel pipe, etc. connected by bolts. Aluminum alloy has the advantages of light weight, high strength, corrosion resistance, etc., and is suitable for some special environments or occasions with strict requirements on weight. The bottom of the iron tower 1 is provided with an iron tower 1 foundation. The iron tower 1 foundation is a key part supporting the entire iron tower 1 structure, which is usually made of reinforced concrete to enhance its stability and bearing capacity. The design of the iron tower 1 must comply with national or international electrical engineering standards. A safety factor is usually introduced during the design to ensure that the iron tower 1 can operate safely under extreme conditions. The iron tower 1 used for high-voltage power transmission can be designed to bear tens of tons to hundreds of tons of force. The iron tower 1 has a power generation side close to the photovoltaic base and a grid side facing away from the photovoltaic base, and can simultaneously transmit power in two circuits.

[0038] In one embodiment, the cross beam 2 is generally made of steel or aluminum alloy. Steel has high strength and good toughness and can withstand large loads and wind. The steel tower 1 is usually made of steel components of different shapes such as angle steel, channel steel, and steel pipe connected by bolts. Aluminum alloy has the advantages of light weight, high strength, and corrosion resistance, and is suitable for some special environments or occasions with strict requirements on weight. The cross beam 2 is usually made of angle steel, channel steel or steel pipe, spanning across the two sides of the tower 1, and is used to support the conductor and ground wire. The crossbeam 2 is fixed to the iron tower 1 by bolts or welding, which is convenient for operators to install and maintain. The crossbeam 2 spans across the two sides of the iron tower 1, and the two ends of each crossbeam 2 are respectively used to fix the transmission wires of different loops; the crossbeams include a ground wire crossbeam 24, an upper crossbeam 21, a middle crossbeam 22 and a lower crossbeam 23 arranged in sequence from the top of the iron tower 1 to the bottom, each crossbeam has an input end close to the power generation side and an output end close to the power grid side, and each crossbeam 2 has a first wiring side 2a and a second wiring side 2b facing the same direction; the two ends of the ground wire crossbeam 24 are respectively used to connect the two loop ground wires, and the ground wire crossbeam 24 is located at the top of the iron tower 1 and has no transposition relationship with the wires on other crossbeams 2. The two ends of the upper crossbeam 21, the middle crossbeam 22 and the lower crossbeam 23 are respectively used for the series connection of one of the three-phase lines in the two circuits, and are usually used for phase switching of lines that require phase switching, which is generally achieved through the lead 3 and the insulator. The three-phase lines are transposed to the specified position to reduce the electromagnetic interference between the circuits, balance the distribution of current in each phase conductor, and reduce the voltage imbalance caused by current imbalance.

[0039] In the embodiment of the utility model, by setting the double-circuit transposition tower 100 on the same tower into two independent transmission circuits, on a single circuit, the wire connected to the input end of at least one beam 2 is connected in series to the output end of another beam 2, so that the phase sequence on the circuit changes; at the same time, the wire connected to the input end of at least one beam 2 on another circuit is connected in series to the output end of another beam 2, and the phase sequence transformation arrangement on both sides is inconsistent. Through the above-mentioned asymmetric transposition connection mode, the three-phase current can be effectively balanced, the voltage imbalance problem caused by the double-circuit transmission line on the same tower can be reduced, and the stability of the power grid and the power generation efficiency of the photovoltaic power station can be improved. If the arrangement order of the beams 2 is the upper beam 21, the middle beam 22 and the lower beam 23, then on the first connection side 2a, the input end of the lower beam 23 may be connected to the output end of the upper beam 21, and on the second connection side 2b, the input end of the lower beam 23 may be connected to the output end of the middle beam 22, so as to realize the asymmetric transposition of the wires. This reduces electromagnetic interference between circuits, balances the distribution of current in each phase conductor, and reduces voltage imbalance caused by current imbalance. The commutation operation can adjust the phase according to actual load conditions to adapt to different load requirements and reduce the impact of load imbalance on voltage levels.

[0040] In practical applications, based on the transposition method of the input end and the output end of the first connection side 2a of the beam 22 and the transposition method of the input end and the output end of the second connection side 2b in the previous embodiment, in order to reduce the voltage imbalance problem of the three-phase circuit, the above-mentioned transposition method can also have other structural forms, which are distinguished and explained in the following by the first to fourth embodiments.

[0041] First embodiment

[0042] See also Figure 2 , multiple beams 2 include an upper beam 21, a middle beam 22 and a lower beam 23. On the first wiring side 2a, the input end of the upper beam 21 is connected in series with the output end of the lower beam 23, the input end of the middle beam 22 is connected in series with the output end of the upper beam 21, and the input end of the lower beam 23 is connected in series with the output end of the middle beam 22; on the second wiring side 2b, the input end of the upper beam 21 is connected in series with the output end of the middle beam 22, the input end of the middle beam 22 is connected in series with the output end of the lower beam 23, and the input end of the lower beam 23 is connected in series with the output end of the upper beam 21.

[0043] In this embodiment, at the first connection side 2a of the tower 1, a specific cross beam 2 is used in series to redistribute the Figure 2The currents of the three phases A, B, and C shown are used to reduce the voltage imbalance during the circuit transmission process. First, the input end of the upper beam 21 is connected to the output end of the lower beam 23 through the lead 3 to form a current path; the input end of the middle beam 22 is connected in series with the output end of the upper beam 21 to further connect the current path; the input end of the lower beam 23 is connected to the output end of the middle beam 22 to complete the loop transposition of the first wiring side 2a. The upper beam 21 originally used to transmit the A-phase current is used to transmit the B-phase current, the middle beam 22 originally used to transmit the B-phase current is used to transmit the C-phase current, and the lower beam 23 originally used to transmit the C-phase current is used to transmit the A-phase current, realizing the phase change of the three-phase current; this connection method effectively changes the phase of the current and helps to balance the three-phase current. On the second wiring side 2b of the tower 1, a similar series connection method is adopted, but the connection order is changed. The input end of the upper crossbeam 21 is connected to the output end of the middle crossbeam 22, the input end of the middle crossbeam 22 is connected in series with the output end of the lower crossbeam 23, and the input end of the lower crossbeam 23 is connected to the output end of the upper crossbeam 21. This reverse series connection sequence further enhances the redistribution of current and ensures the balance of three-phase voltage; the upper crossbeam 21 originally used to transmit A-phase current is used to transmit C-phase current, the middle crossbeam 22 originally used to transmit B-phase current is used to transmit A-phase current, and the lower crossbeam 23 originally used to transmit C-phase current is used to transmit B-phase current, realizing the phase change of three-phase current; this connection method effectively changes the phase of the current and helps to achieve the balance of three-phase voltage. Through the above implementation, the technical solution can achieve the change of the specific sequence of three-phase current phases by simply adjusting the connection of each transmission conductor between the crossbeams without changing the structure of the existing iron tower 1, thereby ensuring the balance of three-phase voltage and improving the operating efficiency and stability of the power system.

[0044] Second embodiment

[0045] See also Figure 3 , multiple beams 2 include an upper beam 21, a middle beam 22 and a lower beam 23. On the first wiring side 2a, the input end of the upper beam 21 is connected in series with the output end of the upper beam 21, the input end of the middle beam 22 is connected in series with the output end of the lower beam 23, and the input end of the lower beam 23 is connected in series with the output end of the middle beam 22; on the second wiring side 2b, the input end of the upper beam 21 is connected in series with the output end of the middle beam 22, the input end of the middle beam 22 is connected in series with the output end of the upper beam 21, and the input end of the lower beam 23 is connected in series with the output end of the lower beam 23.

[0046] In this embodiment, at the first connection side 2a of the iron tower 1, a specific beam series connection method is used to redistribute the Figure 3The currents of the three phases A, B, and C shown are used to reduce the voltage imbalance during the circuit transmission process. First, the input end of the upper beam 21 is connected to the output end of the upper beam 21 through the lead 3 to form a current path; the input end of the middle beam 22 is connected in series with the output end of the lower beam 23 to further connect the current path; the input end of the lower beam 23 is connected to the output end of the middle beam 22 to complete the loop transposition of the first wiring side 2a. The upper beam 21 is used to transmit the A phase current, the middle beam 22 originally used to transmit the B phase current is used to transmit the C phase current, and the lower beam 23 originally used to transmit the C phase current is used to transmit the B phase current, realizing the phase change of the three-phase current; this connection method effectively changes the phase of the current and helps to balance the three-phase current. On the second wiring side 2b of the tower 1, a similar series connection method is adopted, but the connection order is changed. The input end of the upper crossbeam 21 is connected to the output end of the middle crossbeam 22, the input end of the middle crossbeam 22 is connected in series with the output end of the upper crossbeam 21, and the input end of the lower crossbeam 23 is connected to the output end of the lower crossbeam 23. This series connection sequence further enhances the redistribution of current and ensures the balance of three-phase voltage; the upper crossbeam 21 originally used to transmit A-phase current is used to transmit B-phase current, the middle crossbeam 22 originally used to transmit B-phase current is used to transmit A-phase current, and the lower crossbeam 23 is used to transmit C-phase current, realizing the phase change of three-phase current; this connection method effectively changes the phase of the current and helps to achieve the balance of the three-phase voltage. Through the above implementation, the technical solution can achieve the change of the specific sequence of the three-phase current phase by simply adjusting the connection of each transmission conductor between the crossbeams without changing the structure of the existing iron tower 1, thereby ensuring the balance of the three-phase voltage and improving the operating efficiency and stability of the power system.

[0047] Third embodiment

[0048] See also Figure 4 , multiple beams 2 include an upper beam 21, a middle beam 22 and a lower beam 23. On the first wiring side 2a, the input end of the upper beam 21 is connected in series with the output end of the upper beam 21, the input end of the middle beam 22 is connected in series with the output end of the lower beam 23, and the input end of the lower beam 23 is connected in series with the output end of the middle beam 22; on the second wiring side 2b, the input end of the upper beam 21 is connected in series with the output end of the lower beam 23, the input end of the middle beam 22 is connected in series with the output end of the middle beam 22, and the input end of the lower beam 23 is connected in series with the output end of the upper beam 21.

[0049] In this embodiment, at the first connection side 2a of the iron tower 1, a specific beam series connection method is used to redistribute the Figure 4The currents of the three phases A, B, and C shown are used to reduce the voltage imbalance during the circuit transmission process. First, the input end of the upper beam 21 is connected to the output end of the upper beam 21 through the lead 3 to form a current path; the input end of the middle beam 22 is connected in series with the output end of the lower beam 23 to further connect the current path; the input end of the lower beam 23 is connected to the output end of the middle beam 22 to complete the loop transposition of the first wiring side 2a. The upper beam 21 is used to transmit the A phase current, the middle beam 22 originally used to transmit the B phase current is used to transmit the C phase current, and the lower beam 23 originally used to transmit the C phase current is used to transmit the B phase current, realizing the phase change of the three-phase current; this connection method effectively changes the phase of the current and helps to balance the three-phase current. On the second wiring side 2b of the tower 1, a similar series connection method is adopted, but the connection order is changed. The input end of the upper crossbeam 21 is connected to the output end of the lower crossbeam 23, the input end of the middle crossbeam 22 is connected in series with the output end of the middle crossbeam 22, and the input end of the lower crossbeam 23 is connected to the output end of the upper crossbeam 21. This series connection sequence further enhances the redistribution of current and ensures the balance of three-phase voltage; the upper crossbeam 21 originally used to transmit A-phase current is used to transmit C-phase current, the middle crossbeam 22 is used to transmit B-phase current, and the lower crossbeam 23 originally used to transmit C-phase current is used to transmit A-phase current, realizing the phase change of three-phase current; this connection method effectively changes the phase of the current and helps to achieve the balance of three-phase voltage. Through the above implementation, the technical solution can achieve the change of the specific sequence of three-phase current phases by simply adjusting the connection of each transmission conductor between the crossbeams without changing the structure of the existing iron tower 1, thereby ensuring the balance of three-phase voltage and improving the operating efficiency and stability of the power system.

[0050] Fourth embodiment

[0051] See also Figure 5 , multiple beams 2 include an upper beam 21, a middle beam 22 and a lower beam 23. On the first wiring side 2a, the input end of the upper beam 21 is connected in series with the output end of the middle beam 22, the input end of the middle beam 22 is connected in series with the output end of the upper beam 21, and the input end of the lower beam 23 is connected in series with the output end of the lower beam 23; on the second wiring side 2b, the input end of the upper beam 21 is connected in series with the output end of the lower beam 23, the input end of the middle beam 22 is connected in series with the output end of the middle beam 22, and the input end of the lower beam 23 is connected in series with the output end of the upper beam 21.

[0052] In this embodiment, at the first connection side 2a of the iron tower 1, a specific beam series connection method is used to redistribute the Figure 5The currents of the three phases A, B, and C shown in the figure are used to reduce the voltage imbalance during the circuit transmission process. The input end of the upper crossbeam 21 is connected to the output end of the middle crossbeam 22, the input end of the middle crossbeam 22 is connected in series with the output end of the upper crossbeam 21, and the input end of the lower crossbeam 23 is connected to the output end of the lower crossbeam 23. This series connection sequence further enhances the redistribution of current and ensures the balance of the three-phase voltage; the upper crossbeam 21 originally used to transmit the A-phase current is used to transmit the B-phase current, the middle crossbeam 22 originally used to transmit the B-phase current is used to transmit the A-phase current, and the lower crossbeam 23 is used to transmit the C-phase current, thereby realizing the phase change of the three-phase current. On the second connection side 2b of the iron tower 1, a similar series connection method is adopted, but the connection sequence is changed. The input end of the upper crossbeam 21 is connected to the output end of the lower crossbeam 23, the input end of the middle crossbeam 22 is connected in series with the output end of the middle crossbeam 22, and the input end of the lower crossbeam 23 is connected to the output end of the upper crossbeam 21. This series connection sequence further enhances the redistribution of current and ensures the balance of three-phase voltage; the upper crossbeam 21 originally used to transmit A-phase current is used to transmit C-phase current, the middle crossbeam 22 is used to transmit B-phase current, and the lower crossbeam 23 originally used to transmit C-phase current is used to transmit A-phase current, realizing the phase change of three-phase current; this connection method effectively changes the phase of the current and helps to achieve the balance of three-phase voltage. Through the above implementation, the technical solution can achieve the change of the specific sequence of three-phase current phases by simply adjusting the connection of each transmission conductor between the crossbeams without changing the structure of the existing iron tower 1, thereby ensuring the balance of three-phase voltage and improving the operating efficiency and stability of the power system.

[0053] In one embodiment of the present invention, please refer to Figure 1 The double-circuit transposition tower 100 includes a lead wire 3, and each input end is connected in series with each output end through the lead wire 3.

[0054] In this embodiment, in order to achieve effective redistribution of current, each input end is connected to the corresponding output end through a lead wire 3. These lead wires 3 are made of high conductivity materials to ensure the efficiency and reliability of current transmission. The operator first determines the position of each beam on the iron tower 1, and then connects the lead wire 3 from the input end of each beam to the output end of the corresponding beam according to the design requirements. The connection method of the lead wire 3 can be bolted or use a dedicated electrical connector. During the connection process, the electrical continuity of the lead wire 3 must be ensured to avoid any situation that may cause current interruption or short circuit. After completing the connection of the lead wire 3, necessary electrical tests are performed, including but not limited to current testing, voltage testing and insulation resistance testing, to verify the correctness of the connection and the safety of the system.

[0055] In one embodiment of the present invention, please refer to Figure 1 The plurality of beams include a ground beam 24 , and the ground beam 24 is located at the top of the iron tower 1 .

[0056] In this embodiment, the ground wire crossbeam 24 is mainly used to support the ground wire and ensure the fixation and tension balance of the ground wire on the iron tower 1. The ground wire is an important component of the transmission line, and its main function is to protect the transmission line from direct lightning strikes. The ground wire crossbeam 24 helps to guide the lightning current to flow safely to the ground by fixing the ground wire on the top of the iron tower 1, thereby reducing the damage to the conductor and power facilities caused by lightning strikes. In addition, the ground wire crossbeam 24 also helps to maintain the geometry and tension of the ground wire and ensure its stability under various environmental conditions, such as wind, ice and snow, and temperature changes. The design and location of the ground wire crossbeam 24 are crucial to improving the reliability and safety of the entire transmission system. They are one of the basic structures to ensure the stable operation of the power system and protect the surrounding area from lightning strikes.

[0057] In one embodiment of the present invention, please refer to Figure 1 The double-circuit transposition tower 100 on the same tower includes a tensile insulator 4, and each input end and each output end are electrically insulated and fixed to the iron tower 1 through the tensile insulator 4.

[0058] In one embodiment, the tension insulator 4 is used to achieve electrical insulation and mechanical fixation between the conductor and the iron tower 1. In the design of the double-circuit transposition tower 100 on the same tower, in order to ensure the stable transmission of the transmission conductor and its electrical insulation from the iron tower 1, each input end and each output end are detachably connected to the corresponding crossbeam through the tension insulator 4. When the insulator support structure is set on the crossbeam, the tension insulator 4 suitable for the voltage level and mechanical load should be selected, and these insulators should have good electrical insulation performance and sufficient mechanical strength. One end of the tension insulator 4 is fixed to the support structure of the crossbeam, and the other end is detachably connected to the transmission conductor by bolts or clamps. This connection method allows the conductor to be easily installed, adjusted or replaced without removing the entire crossbeam. During the connection process, it is necessary to ensure that the installation position of the tension insulator 4 is accurate and the tightening force of the connector is appropriate to prevent the conductor from being displaced or vibrated during operation. After the connection is completed, necessary electrical tests are performed, including insulation resistance tests and ground continuity tests, to ensure the safety and functionality of the connection.

[0059] In one embodiment of the present invention, please refer to Figure 1 The double-circuit transposition tower 100 on the same tower includes a hanging insulator 5 and a supporting insulator 6. When the input end and the output end of each two beams are connected in series through the lead wire 3, the hanging insulator 5 and the supporting insulator 6 electrically insulate and fix the lead wire 3 and the iron tower 1.

[0060] In one embodiment, the installation positions of the hanging insulator 5 and the supporting insulator 6 are determined according to the structure of the iron tower 1 and the position of the crossbeam. The hanging insulator 5 is mainly used to support the vertical part of the lead wire 3, while the supporting insulator 6 is used to support the horizontal part of the lead wire 3. Suitable insulators with sufficient mechanical strength and electrical insulation performance are selected to adapt to different working voltages and environmental conditions. The hanging insulator 5 is installed at an appropriate height of the iron tower 1 to support the lower end of the lead wire 3. A special fastening device or clamp is used to fix the lower end of the lead wire 3 on the hanging insulator 5 to ensure the stability of the lead wire 3 in the vertical direction. The supporting insulator 6 is installed in the horizontal position of the iron tower 1 to support the upper end of the lead wire 3. A fastening device or clamp is also used to fix the upper end of the lead wire 3 on the supporting insulator 6 to ensure the stability of the lead wire 3 in the horizontal direction. During the connection process, it is necessary to ensure that the installation positions of the hanging insulator 5 and the supporting insulator 6 are accurate and the fastening force is appropriate to prevent the lead wire 3 from displacement or vibration during operation. After completing the connections, perform necessary electrical tests, including insulation resistance tests and ground continuity tests, to ensure the safety and functionality of the connections.

[0061] The utility model also proposes a transmission line, which includes: at least one double-circuit transposition tower 100 on the same tower; at least one straight tower; at least one tension tower; and multiple sections of transmission conductors, each straight tower, each tension tower and each double-circuit transposition tower on the same tower are sequentially connected in series through multiple sections of the transmission conductors. The specific structure of the double-circuit transposition tower 100 on the same tower refers to the above embodiment. Since the transmission line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0062] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A double-circuit transposition tower (100) in the same tower, characterized in that: include: An iron tower (1), the iron tower (1) having a power generation side close to a photovoltaic base and a power grid side facing away from the photovoltaic base; and A plurality of cross beams (2), the plurality of cross beams (2) being arranged on the iron tower (1) in sequence from top to bottom, each of the cross beams (2) having an input end close to the power generation side and an output end close to the power grid side; the double-circuit transposition tower (100) on the same tower having a first connection side (2a) and a second connection side (2b) respectively located on opposite sides of the iron tower (1), and two ends of each cross beam (2) respectively located on the first connection side (2a) and the second connection side (2b); On the first connection side (2a), a high-voltage line connected to the input end of at least one of the beams (2) is connected in series to the output end of another beam (2); On the second wiring side (2b), a high-voltage line connected to the input end of at least one of the beams (2) is connected in series to the output end of another beam (2); At least one set of the input end and the output end connected in series are located on two different beams in the first wiring side (2a) and the second wiring side (2b).

2. The same-tower double-circuit transposition tower (100) according to claim 1, characterized in that: The plurality of crossbeams (2) include an upper crossbeam (21), a middle crossbeam (22) and a lower crossbeam (23); at the first wiring side (2a), the input end of the upper crossbeam (21) is connected in series with the output end of the lower crossbeam (23), the input end of the middle crossbeam (22) is connected in series with the output end of the upper crossbeam (21), and the input end of the lower crossbeam (23) is connected in series with the output end of the middle crossbeam (22); On the second wiring side (2b), the input end of the upper beam (21) is connected in series with the output end of the middle beam (22), the input end of the middle beam (22) is connected in series with the output end of the lower beam (23), and the input end of the lower beam (23) is connected in series with the output end of the upper beam (21).

3. The same-tower double-circuit transposition tower (100) according to claim 1, characterized in that: The plurality of crossbeams (2) include an upper crossbeam (21), a middle crossbeam (22) and a lower crossbeam (23); at the first wiring side (2a), the input end of the upper crossbeam (21) is connected in series with the output end of the upper crossbeam (21), the input end of the middle crossbeam (22) is connected in series with the output end of the lower crossbeam (23), and the input end of the lower crossbeam (23) is connected in series with the output end of the middle crossbeam (22); On the second wiring side (2b), the input end of the upper beam (21) is connected in series with the output end of the middle beam (22), the input end of the middle beam (22) is connected in series with the output end of the upper beam (21), and the input end of the lower beam (23) is connected in series with the output end of the lower beam (23).

4. The same-tower double-circuit transposition tower (100) according to claim 1, characterized in that: The plurality of crossbeams (2) include an upper crossbeam (21), a middle crossbeam (22) and a lower crossbeam (23); at the first wiring side (2a), the input end of the upper crossbeam (21) is connected in series with the output end of the upper crossbeam (21), the input end of the middle crossbeam (22) is connected in series with the output end of the lower crossbeam (23), and the input end of the lower crossbeam (23) is connected in series with the output end of the middle crossbeam (22); On the second wiring side (2b), the input end of the upper beam (21) is connected in series with the output end of the lower beam (23), the input end of the middle beam (22) is connected in series with the output end of the middle beam (22), and the input end of the lower beam (23) is connected in series with the output end of the upper beam (21).

5. The double-circuit transposition tower (100) according to claim 1, characterized in that: The plurality of crossbeams (2) include an upper crossbeam (21), a middle crossbeam (22) and a lower crossbeam (23); at the first wiring side (2a), the input end of the upper crossbeam (21) is connected in series with the output end of the middle crossbeam (22), the input end of the middle crossbeam (22) is connected in series with the output end of the upper crossbeam (21), and the input end of the lower crossbeam (23) is connected in series with the output end of the lower crossbeam (23); On the second wiring side (2b), the input end of the upper beam (21) is connected in series with the output end of the lower beam (23), the input end of the middle beam (22) is connected in series with the output end of the middle beam (22), and the input end of the lower beam (23) is connected in series with the output end of the upper beam (21).

6. The double-circuit transposition tower (100) according to any one of claims 1 to 5, characterized in that: The same-tower double-circuit transposition tower (100) comprises a lead wire (3), and each input end and each output end are connected in series via the lead wire (3).

7. The double-circuit transposition tower (100) according to any one of claims 1 to 5, characterized in that: The plurality of beams (2) include a ground wire beam (24), wherein the ground wire beam (24) is located at the top of the iron tower (1).

8. The double-circuit transposition tower (100) according to claim 6, characterized in that: The double-circuit transposition tower (100) on the same tower comprises a tensile insulator (4), and each input end and each output end are electrically insulated and fixed to the iron tower (1) through the tensile insulator (4).

9. The double-circuit transposition tower (100) according to claim 8, characterized in that: The double-circuit transposition tower (100) on the same tower comprises a hanging insulator (5) and a supporting insulator (6). When the input end and the output end of each two beams are connected in series through the lead wire (3), the hanging insulator (5) and the supporting insulator (6) electrically insulate and fix the lead wire (3) and the iron tower (1).

10. A power transmission line, characterized in that: The transmission line comprises: At least one double-circuit transposition tower (100) as claimed in any one of claims 1 to 9; at least one linear tower; at least one tension tower; and A plurality of sections of transmission wires, each of the straight towers, each of the tension towers and each of the double-circuit transposition towers (100) on the same tower are sequentially connected in series through the plurality of sections of transmission wires.

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