Power transmission line parallel gap for high altitude area

Abstract

The utility model provides a power transmission line parallel gap for a high-altitude area, which is used for covering two ends of a line insulator and comprises a grounding side electrode and a high-voltage side electrode which are respectively covered and fixed at the upper end and the lower end of the line insulator, the grounding side electrode comprises a long rod and two round hooks which are integrally formed, the two round hooks are symmetrically arranged at the two ends of the long rod respectively, the middle of the long rod is fixedly connected with a ball head of the line insulator, the number of contact points of line lightning stroke is increased through the arrangement of the round hooks, and protection of the grounding side electrode to the line insulator is improved. The high-voltage side electrode comprises two electrode pieces, and the two electrode pieces are oppositely fixed to the two sides of the triangular yoke plate respectively; through the combined action of the grounding side electrode and the high-voltage side electrode, a line insulator is covered to a certain extent, the line insulator is effectively protected and the line insulator is prevented from being ablated during parallel gap lightning flashover, and a good lightning protection effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of lightning protection for power transmission lines, and in particular relates to a parallel gap for power transmission lines used in high altitude areas. Background Art

[0002] By the end of 2022, the total mileage of 500kV AC transmission lines of State Grid Corporation of China has reached 164,000 kilometers. In the past five years, the proportion of lightning tripping of 500kV AC transmission lines in the total tripping was 57%, 56%, 51%, 45% and 42% respectively, which accounted for the highest proportion of line tripping caused by external force damage, ice damage, bird damage, wind damage, pollution flashover and other factors. As a "drainage type" lightning protection device, the parallel gap is a powerful supplement to the "blocking type" lightning protection measures. It can solve the lightning strike problem of transmission lines that are insensitive to the lightning tripping rate with low-cost investment. The existing 500kV parallel gap is only suitable for areas at an altitude of 2000m and below, and there have been cases where line insulators were burned by power frequency continuous current after being struck by lightning flashover. The effectiveness of protection needs to be further improved. At the same time, it is not suitable for line lightning protection in areas at an altitude of 4000m and above.

[0003] Therefore, how to provide a parallel gap for 500kV AC transmission lines suitable for areas with an altitude of more than 4000m to solve the problems of poor applicability of traditional parallel gaps in high-altitude areas, failure of lightning protection, and ablation of line insulators, and ensure the safe operation of transmission lines in high-altitude areas is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a parallel gap for power transmission lines used in high altitude areas, so as to solve at least one of the above technical problems.

[0005] In order to solve the above technical problems, the utility model provides a parallel gap of a transmission line for use in high-altitude areas, wherein the parallel gap covers of the transmission line are arranged at both ends of a line insulator, wherein the line insulator comprises a ball head located at the upper end of the line insulator and a triangular connecting plate located at the lower end of the line insulator, and the parallel gap of the transmission line comprises: a grounding side electrode, wherein the grounding side electrode comprises a long rod and two round hooks, wherein the two round hooks are integrally formed with the long rod and are symmetrically arranged at both ends of the long rod; the middle part of the long rod is fixedly connected to the ball head; and a high-voltage side electrode, wherein the high-voltage side electrode comprises two electrode pieces, and the two electrode pieces are respectively relatively fixed on both sides of the triangular connecting plate.

[0006] Optionally, a connection between the two round hooks and the long rod has a first bending angle.

[0007] Optionally, first projections of the two round hooks along the opening direction of the first mounting hole are both straight lines, and respectively form the first bending angle with the second projections of the long rod along the opening direction of the first mounting hole.

[0008] Optionally, the electrode member includes a U-shaped tube and a connecting plate, the two ends of the connecting plate are respectively fixedly connected to the two ends of the U-shaped tube, an integrally formed mounting rib is provided in the middle of the top surface of the connecting plate, and is fixedly connected to the triangular connecting plate through the mounting rib.

[0009] Optionally, the closed end of the U-shaped tube has a second bending angle, and the bending direction of the closed end is consistent with the orientation of the top surface of the connecting plate.

[0010] Optionally, two first mounting holes are opened in the middle of the long rod, and the long rod is threadedly connected to the ball head through the two first mounting holes.

[0011] Optionally, the mounting rib has two second mounting holes extending therethrough, and the mounting surfaces of the two mounting ribs are respectively pressed against two sides of the triangular connecting plate, and are threadedly connected to the triangular connecting plate through the two second mounting holes; wherein the mounting surface of the mounting rib is perpendicular to the top surface of the connecting plate.

[0012] Optionally, the perpendicular distance between the distal end of the circular hook and the central axis of the line insulator is equal to the perpendicular distance between the closed end of the U-shaped tube and the central axis of the line insulator; the perpendicular distance between the distal end of the circular hook and the plane where the long rod is located is equal to the perpendicular distance between the closed end of the U-shaped tube and the plane where the connecting plate is located.

[0013] Optionally, the long rod and the two round hooks are both made of solid round rods; and / or the U-shaped tube is made of hollow round tubes.

[0014] Optionally, the first bending angle is 110° to 130°; the second bending angle is 100° to 120°.

[0015] Beneficial effects:

[0016] The utility model provides a parallel gap of a power transmission line for high altitude areas. The grounding side electrode comprises an integrally formed long rod and two round hooks, the two round hooks are symmetrically arranged at two ends of the long rod, the middle part of the long rod is fixedly connected to the ball head of the line insulator, the high-voltage side electrode comprises two electrode pieces, the two electrode pieces are relatively fixed at two sides of a triangular connecting plate, the electrode piece is arranged as a U-shaped tube, so that a runway-type high-voltage side electrode is formed by combining the two U-shaped tubes, and it is ensured that the electrode has sufficient space volume and discharge contact points; a certain degree of covering of the line insulator is achieved by setting the grounding side electrode and the high-voltage side electrode respectively covered and fixed at the upper and lower ends of the line insulator, so that the upper and lower ends of the line insulator form a parallel gap with a covering depth and a covering width, and the gap is used to make the discharge arc of the line insulator occur between the gap electrodes when the line is struck by lightning, so as to avoid the arc damaging the insulator; and the contact points of the line lightning are increased by irregularly arranging the round hooks and the electrode pieces, so as to ensure the effective protection of the line insulator and avoid ablation when the parallel gap is struck by lightning flashover, and play a good lightning protection effect.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments 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 these drawings without paying creative work.

[0019] Figure 1 A front view of the overall structure of a parallel gap in a power transmission line provided in an embodiment of the present application;

[0020] Figure 2 A side view of the overall structure of a parallel gap in a power transmission line provided in an embodiment of the present application;

[0021] Figure 3 A front view of a grounding side electrode of a parallel gap of a power transmission line provided in an embodiment of the present application;

[0022] Figure 4 A side view of a grounding side electrode of a parallel gap of a power transmission line provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of an electrode member for a parallel gap in a power transmission line provided in an embodiment of the present application;

[0024] Reference numerals:

[0025] 1—Line insulator;

[0026] 11—ball head;

[0027] 12—triangular connecting plate;

[0028] 2—ground side electrode;

[0029] 21—Long pole;

[0030] 211—first mounting hole;

[0031] 22—circle hook;

[0032] 221—distal end;

[0033] 3—High voltage side electrode;

[0034] 31 - electrode parts;

[0035] 311—U-shaped tube;

[0036] 312—connecting plate;

[0037] 313—Installation of ribs;

[0038] 314—second mounting hole;

[0039] 315—Mounting surface; DETAILED DESCRIPTION

[0040] 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.

[0041] See also Figure 1-2 The present embodiment provides a transmission line parallel gap for use in high altitude areas. The transmission line parallel gap covers are arranged at both ends of a line insulator 1. The line insulator 1 includes a ball head 11 located at the upper end of the line insulator 1 and a triangular connecting plate 12 located at the lower end of the line insulator 1. The transmission line parallel gap includes: a grounding side electrode 2, the grounding side electrode 2 includes a long rod 21 and two round hooks 22, the two round hooks 22 are integrally formed with the long rod 21, and are symmetrically arranged at both ends of the long rod 21; the middle part of the long rod 21 is fixedly connected to the ball head 11; a high-voltage side electrode 3, the high-voltage side electrode 3 includes two electrode pieces 31, and the two electrode pieces 31 are relatively fixed to the two sides of the triangular connecting plate 12.

[0042] Specifically, the utility model provides a parallel gap of a power transmission line for use in high-altitude areas. By arranging a grounding side electrode 2 and a high-voltage side electrode 3 respectively covered and fixed at the upper and lower ends of a line insulator 1, a parallel gap with a covering depth and a covering width is formed at the upper and lower ends of the line insulator 1. The discharge arc of the line insulator 1 occurs between the gap electrodes when the line is struck by lightning by utilizing the effect of the gap, so as to avoid arc damage to the insulator; and the contact points of line lightning strikes are increased by irregularly arranging the round hook 22 and the electrode member 31, thereby improving the protection of the line insulator 1; wherein, the grounding side electrode 1 includes an integrally formed long rod 11 and two round hooks 12, the two round hooks 12 are symmetrically arranged at the two ends of the long rod, and the middle part of the long rod is fixedly connected to the ball head of the line insulator. The high-voltage side electrode 3 includes two electrode members 31, which are respectively fixed on both sides of the delta connecting plate 12, so as to achieve a certain degree of coverage of the line insulator 1 through the combined action of the grounding side electrode 2 and the high-voltage side electrode 3, thereby ensuring effective protection of the line insulator 1 and avoiding ablation when the parallel gap is struck by lightning flashover, and achieving a good lightning protection effect; wherein, the diameters of the two round hooks 12 arranged at the ends of the grounding side electrode can be set in the range of 150mm-200mm, and the diameters of the round rods used by the long rod 11 and the two round hooks 12 can be in the range of 25mm-35mm; as a feasible method, the diameters of the two round hooks 12 are both 170mm, and the diameters of the round rods used by the long rod 11 and the two round hooks 12 are both 30mm.

[0043] In some possible implementations, the connection between the two round hooks 22 and the long rod 21 has a first bending angle.

[0044] Specifically, by setting the first bending angle, the two circular hooks 22 and the long rod 21 are located at the upper end of the line insulator 1 and are covered downward, so that a covering range is formed by the bending of the two circular hooks 22. At the same time, the shape of the circular hooks 22 is designed to increase the contact points of electrode discharge compared to the conventional round rod-shaped electrode setting, and the probability of arc occurrence between the electrodes is increased, thereby ensuring effective protection of the line insulator and avoiding ablation when the parallel gap is struck by lightning flashover, thereby achieving a good lightning protection effect.

[0045] In some possible implementations, first projections of the two round hooks 22 along the opening direction of the first mounting hole 211 are both straight lines, and respectively form first bending angles with second projections of the long rod 21 along the opening direction of the first mounting hole 211 .

[0046] Specifically, see Figure 3-4 The hook ends of the two round hooks 22 are not arranged toward the line insulator 1, so that the contact surface between the two round hooks 22 and the arc is increased, thereby improving the lightning protection effect.

[0047] In some possible embodiments, the electrode member 31 includes a U-shaped tube 311 and a connecting plate 312, and the two ends of the connecting plate 312 are respectively fixedly connected to the two ends of the U-shaped tube 311, and an integrally formed mounting rib 313 is provided in the middle of the top surface of the connecting plate 312, and is fixedly connected to the triangular connecting plate 12 through the mounting rib 313.

[0048] Specifically, see Figure 5 The connecting wire is connected below the triangular connecting plate 12 at the lower end of the line insulator 1, which belongs to the high-voltage end. The higher the voltage level, the greater the arc energy that the parallel gap needs to withstand. At the same time, the unevenness of the electric field distribution increases, the dispersion of the discharge increases, and the difficulty of ensuring that the arc occurs between the electrodes increases. Therefore, the structure of the U-shaped tube 311 is adopted to ensure that the electrodes have sufficient space volume and discharge contact points, so that the insulator discharge arc occurs between the gap electrodes to avoid arc damage to the insulator; wherein the U-shaped tube includes two open ends and a closed end at the bottom, the distance between the two open ends of the U-shaped tube can be set in the range of 800mm-900mm, and the round tube diameter of the U-shaped tube can be set in the range of 45mm-55mm; as a feasible way, the distance between the two open ends of the U-shaped tube is 850mm, and the round tube diameter of the U-shaped tube is 50mm.

[0049] In some possible implementations, the closed end of the U-shaped tube 311 has a second bending angle, and the bending direction of the closed end is consistent with the direction of the top surface of the connecting plate 312 .

[0050] Specifically, see Figure 1-2 By setting the second bending angle, the U-shaped tube 311 is located at the lower end of the line insulator 1 and is upwardly covered, and a runway-type electrode is formed by the combined covering of the two U-shaped tubes 311, forming a covering range, thereby increasing the probability of arc occurrence between the electrodes, ensuring effective protection of the line insulator and avoiding ablation when the parallel gap is struck by lightning flashover, and achieving a good lightning protection effect.

[0051] In some possible implementations, two first mounting holes 211 are opened in the middle of the long rod 21 , and the long rod 21 is threadedly connected to the ball head 11 through the two first mounting holes 211 .

[0052] In some possible embodiments, two second mounting holes 314 are formed through the mounting rib 313, and the mounting surfaces 315 of the two mounting ribs 313 are respectively pressed against the two sides of the triangular connecting plate 12, and are threadedly connected to the triangular connecting plate 12 through the two second mounting holes 314; wherein the mounting surface 315 of the mounting rib 313 is perpendicular to the top surface of the connecting plate 312.

[0053] Specifically, by installing the ribs 313, the open ends of the U-shaped tubes 311 are vertically installed on both sides of the triangular connecting plate 12, thereby improving the fastening connection between the devices.

[0054] In some possible embodiments, the perpendicular distance between the distal end 221 of the circular hook 22 and the central axis of the line insulator 1 is equal to the perpendicular distance between the closed end of the U-shaped tube 311 and the central axis of the line insulator 1; the perpendicular distance between the distal end 221 of the circular hook 22 and the plane where the long rod 21 is located is equal to the perpendicular distance between the closed end of the U-shaped tube 311 and the plane where the connecting plate 312 is located.

[0055] Specifically, the distances from the ends of the grounding side electrode and the high-voltage side electrode to the center of the line insulator are equal, and the distances can be maintained in the range of 800mm-900mm; the distances from the grounding side electrode and the high-voltage side electrode to the line insulator are equal, and the distances can be maintained in the range of 400mm-450mm; as a feasible method, the distances from the ends of the grounding side electrode and the high-voltage side electrode to the center of the line insulator are 800mm, and the distances from the grounding side electrode and the high-voltage side electrode to the line insulator are 430mm.

[0056] In some possible implementations, the long rod and the two round hooks are both made of solid round rods; and / or the U-shaped tube is made of hollow round tubes.

[0057] Specifically, since the lower end of the triangular connecting plate is connected to the conductor and is the high-voltage end, the volume of the U-shaped tube structure is relatively large, so a U-shaped tube made of a hollow circular tube structure is used to reduce the weight and burden of the high-voltage end; since the upper end of the ball head is connected to the iron tower and is the low-voltage end, a long rod made of a solid round rod structure and two round hooks are used to increase the lightning impulse protection of the electrode pair.

[0058] In some possible implementations, the first bending angle is 110° to 130°; the second bending angle is 100° to 120°.

[0059] Specifically, when the installation is successful, the two round hooks 22 (both sides of the grounding side electrode) are bent downward, and the first bending angle is 60°, and the two U-shaped tubes 311 (both sides of the high-voltage side electrode) are bent upward, and the second bending angle is 70°.

[0060] Experimental results: The line insulator is composed of 42 insulators connected in series. The structural height of a single insulator is 146mm. A lightning impulse discharge voltage test was carried out at an altitude of 4000m. The results showed that the positive and negative polarity lightning impulse 50% discharge voltages of the parallel gap were 1730kV and 1900kV respectively. At this time, the corresponding positive and negative polarity lightning impulse 50% discharge voltages of the line insulator were 2040kV and 2180kV respectively. The positive and negative polarity lightning impulse 50% discharge voltages of the parallel gap were reduced by 15% and 13% respectively compared with the line insulator, which met the technical requirements of the standard of not less than 10%, and can provide good lightning protection for line insulators.

[0061] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiment of the utility model. They should all be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

[0062] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A transmission line parallel gap for use in high altitude areas, wherein the transmission line parallel gap covers are arranged at both ends of a line insulator (1), wherein the line insulator (1) comprises a ball head (11) located at the upper end of the line insulator (1) and a triangular connecting plate (12) located at the lower end of the line insulator (1), characterized in that: The transmission line parallel gap comprises: A grounding side electrode (2), the grounding side electrode (2) comprising a long rod (21) and two round hooks (22), the two round hooks (22) being integrally formed with the long rod (21) and symmetrically arranged at two ends of the long rod (21); the middle portion of the long rod (21) being fixedly connected to the ball head (11); A high-voltage side electrode (3), the high-voltage side electrode (3) comprising two electrode pieces (31), the two electrode pieces (31) being fixed relatively to two sides of the triangular connecting plate (12) respectively.

2. The transmission line parallel gap according to claim 1, characterized in that: The electrode member (31) comprises a U-shaped tube (311) and a connecting plate (312), the two ends of the connecting plate (312) being fixedly connected to the two ends of the U-shaped tube (311) respectively, and an integrally formed mounting rib plate (313) is provided in the middle of the top surface of the connecting plate (312), and is fixedly connected to the triangular connecting plate (12) via the mounting rib plate (313).

3. The transmission line parallel gap according to claim 2, characterized in that: Two first mounting holes (211) are provided in the middle of the long rod (21), and the long rod (21) is threadedly connected to the ball head (11) via the two first mounting holes (211).

4. The transmission line parallel gap according to claim 3, characterized in that: The mounting rib (313) is provided with two second mounting holes (314) therethrough, and the mounting surfaces (315) of the two mounting ribs (313) are respectively closely attached to the two sides of the triangular connecting plate (12), and are threadedly connected to the triangular connecting plate (12) through the two second mounting holes (314); wherein the mounting surface (315) of the mounting rib (313) is perpendicular to the top surface of the connecting plate (312).

5. The transmission line parallel gap according to claim 4, characterized in that: The connection between the two circular hooks (22) and the long rod (21) has a first bending angle.

6. The transmission line parallel gap according to claim 5, characterized in that: The first projections of the two circular hooks (22) along the opening direction of the first mounting hole (211) are both straight lines, and respectively form the first bending angle with the second projections of the long rod (21) along the opening direction of the first mounting hole (211).

7. The transmission line parallel gap according to claim 6, characterized in that: The closed end of the U-shaped tube (311) has a second bending angle, and the bending direction of the closed end is consistent with the orientation of the top surface of the connecting plate (312).

8. The transmission line parallel gap according to claim 7, characterized in that: The first bending angle is 110° to 130°; the second bending angle is 100° to 120°.

9. The transmission line parallel gap according to any one of claims 2 to 8, characterized in that: The perpendicular distance between the distal end (221) of the circular hook (22) and the central axis of the line insulator (1) is equal to the perpendicular distance between the closed end of the U-shaped tube (311) and the central axis of the line insulator (1); The perpendicular distance between the distal end (221) of the circular hook (22) and the plane where the long rod (21) is located is equal to the perpendicular distance between the closed end of the U-shaped tube (311) and the plane where the connecting plate (312) is located.

10. The power transmission line parallel gap according to claim 9, characterized in that: The long rod (21) and the two round hooks (22) are both made of solid round bars; and / or, The U-shaped tube (311) is made of a hollow circular tube.

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