Lightning protection conductor for overhead transmission lines and installation method

Abstract

The present invention provides a lightning protection conductor for overhead power transmission lines and a method for installing the conductor, belonging to the field of lightning protection technology. The conductor comprises a bare conductor and discharge tips uniformly distributed on the bare conductor. The lightning protection conductor for overhead power transmission lines provided by the present invention has discharge tips uniformly distributed on the bare conductor. When the conductor is assembled into an overhead line, the discharge tips effectively prevent charge accumulation during thunderstorms, minimizing the probability of lightning striking the conductor and thereby reducing the probability of line tripping accidents caused by lightning strikes.

Description

Technical Field

[0001] The present invention belongs to the technical field of lightning protection, and in particular relates to a lightning protection conductor for an overhead power transmission line and a method for installing the conductor. Background Art

[0002] At present, overhead transmission lines generally use steel-core aluminum stranded wire as transmission conductors. However, the relevant specifications for transmission lines below 66kV do not require the installation of ground wires along the entire line. This increases the probability of lightning striking the transmission conductors, thereby increasing the probability of line tripping accidents caused by lightning strikes.

[0003] At the same time, for those transmission lines that have been equipped with ground wires along the entire line, due to the influence of the spacing between the towers, sag and terrain factors, lightning may bypass the ground wire shielding and hit the transmission wires, causing line tripping accidents.

[0004] The tripping of transmission lines due to lightning strikes will have a certain impact on the safe operation of transmission line equipment, cause corresponding economic losses, and even affect the normal production and living order. Summary of the Invention

[0005] The embodiments of the present invention provide a lightning protection conductor for an overhead transmission line and a method for installing the conductor, aiming to reduce or avoid line tripping faults caused by lightning strikes.

[0006] In a first aspect, to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide an overhead transmission line lightning protection conductor, comprising: a bare conductor and discharge tips uniformly distributed on the bare conductor.

[0007] In combination with the first aspect, in a possible implementation, the bare conductor is a steel-core aluminum stranded wire.

[0008] With reference to the first aspect, in a possible implementation, the height of the discharge tip exposed from the bare wire is 6 cm-6.5 cm.

[0009] In combination with the first aspect, in a possible implementation, the two discharge tips are connected as one through a connecting column, the steel core aluminum stranded wire is wound from the connecting column, and the two discharge tips are symmetrically exposed outside the steel core aluminum stranded wire.

[0010] In combination with the first aspect, in a possible implementation, anti-slip protrusions or anti-slip grooves are provided on the outer surface of the connecting column.

[0011] In combination with the first aspect, in a possible implementation manner, a fastening head is provided at the root of the discharge tip, and a fastening plate is provided on the fastening head.

[0012] In combination with the first aspect, in a possible implementation, the outer surface of the fastening head and the fastening plate are both provided with anti-slip protrusions or anti-slip grooves.

[0013] In combination with the first aspect, in a possible implementation, the discharge tips are distributed in four rows along the circumferential direction on the bare wire, and the discharge tips in two adjacent rows are staggered.

[0014] In combination with the first aspect, in a possible implementation, the outer surface of the lightning protection wire is provided with a protective sleeve, and the protective sleeve is provided with a zipper along the length direction.

[0015] In a second aspect, an embodiment of the present invention further provides a method for installing a lightning protection conductor for an overhead transmission line, the method comprising:

[0016] When laying the line overhead, a flexible wire is placed on the zipper of the protective casing;

[0017] The protective sleeve is unfolded from the winding drum and installed overhead together with the lightning protection conductor;

[0018] When both ends of the lightning protection wire are tightened, pull the soft wire to open the zipper, so that the protective sleeve falls off the lightning protection wire, and the installation of the lightning protection wire is completed.

[0019] Compared with the prior art, the lightning protection conductor for overhead power transmission lines provided by the present invention has the following beneficial effects: discharge tips are evenly distributed on the bare conductors, and the lightning protection conductors are used to form overhead lines. During thunderstorm seasons, the presence of the discharge tips can effectively avoid charge accumulation, minimize the probability of lightning striking the conductors, and thus reduce the probability of line tripping accidents caused by lightning strikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the lightning protection conductor for overhead transmission lines provided by the embodiment of the present invention Figure 1 ;

[0021] Figure 2 Schematic diagram of the structure of the lightning protection conductor for overhead transmission lines provided by the embodiment of the present invention Figure 2 ;

[0022] Figure 3 Schematic diagram of the structure of the discharge tip provided in the embodiment of the present invention Figure 1 ;

[0023] Figure 4 Schematic diagram of the structure of the discharge tip provided in the embodiment of the present invention Figure 2 ;

[0024] Figure 5 A schematic diagram of the structure of a lightning protection wire wound on a wire roller provided in an embodiment of the present invention;

[0025] Description of reference numerals:

[0026] 1. Discharge tip; 11. Connecting column; 12. Anti-slip protrusion; 13. Fastening head; 14. Fastening plate; 15. Anti-slip groove; 2. Bare wire; 3. Protective sleeve; 4. Wire roller; 5. Pulling head. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] Please also refer to Figure 1 and Figure 2 The overhead transmission line lightning protection conductor provided by the present invention is now described. The overhead transmission line lightning protection conductor comprises: a bare conductor 2 and discharge tips 1 uniformly distributed on the bare conductor 2.

[0029] The lightning protection conductor for overhead power transmission lines provided by the present invention has discharge tips 1 evenly distributed on a bare conductor 2. This lightning protection conductor forms an overhead line. During thunderstorm seasons, the presence of the discharge tips 1 can effectively avoid charge accumulation, minimize the probability of lightning striking the conductor, and thus reduce the probability of line tripping accidents caused by lightning strikes.

[0030] Arranging a discharge tip 1 on a bare conductor 2 can prevent lightning strikes. The principle is as follows:

[0031] According to the tip discharge principle, the higher the electric field strength around the tip, the easier it is to discharge. The electric field strength depends on the curvature radius of the discharge tip 1 and the coulomb amount of accumulated charge: E = Q / 4π§r 2 . It can be seen from the above formula that in the same medium, under the condition of a certain charge Q, the larger the tip curvature radius, the lower the electric field strength. If all factors are the same, experiments are carried out with blunt needles and sharp needles respectively. Facing the thundercloud above, the blunt needle has a large curvature radius. Under the same conditions, the electric field strength is low, and it is not easy to discharge, so the charge continues to accumulate. When the charge accumulates to a certain level, the blunt needle will suddenly break through the air to emit an electron flow. This electron flow is easy to connect with the step leader discharge to form the main channel of lightning strike, triggering lightning strike. The sharp needle is just the opposite. The sharp needle has a small curvature radius and a high electric field strength. It will discharge first and ionize the nearby air to form a corona. At this time, the discharge current is small, and it is not easy to connect with the step leader discharge in the cloud. At the same time, long-term high-frequency and low-energy discharge can avoid charge accumulation, so it is not easy to trigger lightning strikes.

[0032] In some embodiments, as Figure 1 and Figure 2As shown, the bare conductor 2 is a steel-core aluminum stranded wire. The present invention uses steel-core aluminum stranded wire as the bare conductor 2. By adding a certain number of discharge tips 1 during the production and winding process of aluminum stranded wire, which is already widely used in traditional power transmission lines, the final product has both power transmission capabilities and a certain degree of lightning protection. Furthermore, a specially designed zipper-type protective sleeve 3 protects the discharge tips 1 from damage during the winding and installation processes.

[0033] The specific production examples are as follows: Figure 1 、 Figure 2 and Figure 5 As shown, in the production and stranding of traditional steel core aluminum stranded wire, a discharge tip 1 is added at a ratio of 6,000 to 10,000 strands per meter, and a zipper-type protective sleeve 3 is inserted into the starting end. As the wire lengthens, it is wound layer by layer on a wooden wire roller 4 (as shown in FIG. Figure 5 As shown, a 2-3 meter length is reserved at the end of the conductor for traction. The protective sleeve 3 effectively protects the discharge tip 1 from damage due to compression, ensuring its structural integrity and preventing it from tilting. A zipper is provided. After the conductor is installed overhead, the zipper can be opened on the ground using a soft cord connected to the zipper, causing the protective sleeve 3 to automatically fall off and onto the ground.

[0034] Wherein, traction heads 5 are respectively provided at both ends of the lightning protection conductor to facilitate the traction of the overhead line and the fixing of both ends during installation.

[0035] In some embodiments, as Figure 1 and Figure 2 As shown, the height of the discharge tip 1 exposed above the bare conductor 2 is 6cm-6.5cm. First, during the conductor winding process, the discharge tip 1 must be evenly distributed on the conductor. At the same time, the distance between the discharge tip 1 and the two ends of the conductor must be between 6cm and 6.5cm. Furthermore, the discharge tip 1 must be firm and not bend, ensuring optimal lightning protection after the conductor is installed.

[0036] As an embodiment of the discharge tip 1, Figure 3 As shown, the two discharge tips 1 are connected as one by a connecting post 11. The steel-core aluminum stranded wire is wound around the connecting post 11, and the two discharge tips 1 are symmetrically exposed outside the steel-core aluminum stranded wire. This structure of two connected discharge tips 1 allows the steel-core aluminum stranded wire to be wound around the connecting post 11, improving the secureness of the discharge tips 1 wound around the steel-core aluminum stranded wire.

[0037] In some embodiments, as Figure 3 As shown, the outer surface of the connecting column 11 is provided with anti-skid protrusions 12 or anti-skid grooves 15. The anti-skid protrusions 12 increase the friction between the steel core aluminum stranded wire and the connecting column 11, thereby ensuring the radial position layout of the discharge tip 1 and preventing the discharge tip 1 from deflecting.

[0038] As another embodiment of the discharge tip 1, Figure 4 As shown, the root of the discharge tip 1 is provided with a fastening head 13, and a fastening plate 14 is provided on the fastening head 13. When the steel core aluminum stranded wire is wound, it can be wound around the fastening plate 14, thereby improving the firmness of the discharge tip 1 wound on the steel core aluminum stranded wire.

[0039] Similarly, in some embodiments, as Figure 4 As shown, the outer surface of the fastening head 13 and the fastening plate 14 are both provided with anti-slip protrusions 12 or anti-slip grooves 15 to increase the friction between the steel core aluminum stranded wire and the fastening head 13, thereby ensuring the radial position layout of the discharge tip 1 and preventing the discharge tip 1 from deflecting.

[0040] In some embodiments, as Figure 1 and Figure 2 As shown, the discharge tips 1 are distributed in four rows along the circumference of the bare conductor 2, and the discharge tips 1 in two adjacent rows are staggered. This ensures that the discharge tips 1 are evenly distributed on the bare conductor 2, thereby ensuring the effectiveness and reliability of lightning protection.

[0041] In some embodiments, as Figure 1 and Figure 5 As shown, the lightning protection conductor is covered with a protective sleeve 3 with a zipper along its length. The protective sleeve 3 protects the discharge tip 1. Because the steel-core aluminum stranded wire is wound around a wooden roller 4, the layers of winding and compression can damage the discharge tip 1. During installation, the lightning protection conductor inevitably rubs against the ground, but the protective sleeve 3 still protects the discharge tip 1. The zipper-style protective sleeve 3 makes it easy to open and remove it after installation.

[0042] The protective sleeve 3 used on the outside of the lightning protection wire in this embodiment adopts a zipper design, which should have good flexibility while ensuring strength and can be passed through and wound on the wooden wire roller 4.

[0043] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0044] Based on the same inventive concept, an embodiment of the present application further provides a method for installing a lightning protection conductor for an overhead transmission line, the method comprising:

[0045] When laying the line overhead, a flexible wire is provided on the zipper of the protective casing 3;

[0046] The protective sleeve 3 is unfolded from the winding drum together with the lightning protection wire and installed overhead;

[0047] After both ends of the lightning protection wire are tightened, the zipper is opened by pulling the soft wire to make the protective sleeve 3 fall off from the lightning protection wire, thus completing the installation of the lightning protection wire.

[0048] In tests, the lightning protection conductor provided by the present invention was compared with a conventional lightning rod of the same height in 40 lightning strike tests. The conventional lightning rod had a 100% lightning strike probability. Under the test conditions, the 50% discharge voltage U50 of the lightning protection conductor was 626.0 kV, while that of the conventional lightning rod was 522.40 kV. The 50% discharge voltage U50 of the lightning protection conductor provided by the present invention was 103.6 kV higher than that of the conventional lightning rod.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lightning protection conductor for overhead power transmission lines, characterized in that: include: A bare conductor (2) and discharge tips (1) uniformly distributed on the bare conductor (2); the bare conductor (2) is a steel core aluminum stranded wire; The height of the discharge tip (1) exposed from the bare wire (2) is 6 cm to 6.5 cm; The two discharge tips (1) are connected as a whole via a connecting column (11); the steel core aluminum stranded wire is wound from the connecting column (11); and the two discharge tips (1) are symmetrically exposed outside the steel core aluminum stranded wire; The outer surface of the connecting column (11) is provided with anti-skid protrusions (12) or anti-skid patterns; During the production and stranding of steel core aluminum stranded wire, discharge tips are added at a ratio of 6,000 to 10,000 strands per meter, and a zipper-type protective sleeve is inserted into the starting end. As the wire lengthens, it is wound layer by layer on a wooden wire roller, and a length of 2 to 3 meters is reserved at the end of the wire for traction.

2. The overhead power transmission line lightning protection conductor according to claim 1, characterized in that: A fastening head (13) is provided at the root of the discharge tip (1), and a fastening plate (14) is provided on the fastening head (13).

3. The overhead power transmission line lightning protection conductor according to claim 2, characterized in that: The outer surface of the fastening head (13) and the fastening plate (14) are both provided with anti-skid protrusions or anti-skid lines (15).

4. The overhead power transmission line lightning protection conductor according to claim 1, characterized in that: The discharge tips (1) are distributed in four rows along the circumferential direction on the bare conductor (2), and the discharge tips (1) in two adjacent rows are staggered.

5. The overhead power transmission line lightning protection conductor according to claim 1, characterized in that: The outer surface of the lightning protection wire is covered with a protective sleeve (3), and the protective sleeve (3) is provided with a zipper along the length direction.

6. A method for installing a lightning protection conductor for an overhead power transmission line according to any one of claims 1 to 5, characterized in that: The method comprises: When the line is installed overhead, a soft wire is provided on the zipper of the protective casing (3); The protective sleeve (3) is unfolded from the winding drum together with the lightning protection wire and installed overhead; When both ends of the lightning protection wire are tightened, the zipper is opened by pulling the soft wire, so that the protective sleeve (3) falls off from the lightning protection wire, and the installation of the lightning protection wire is completed.

Images