Device for improving lightning resistance of direct-current power transmission iron tower

Abstract

The utility model belongs to the technical field of lightning arresters of direct-current power transmission lines, and discloses a device for improving the lightning resistance of a direct-current power transmission tower. The lightning arrester supports are additionally arranged on the left side and the right side of the direct-current tower body respectively, and the lightning arrester is additionally arranged at the proper position of the lower end of the wire of a tower with unsatisfactory lightning protection performance, so that the lightning protection performance of a line can be effectively improved, the lightning trip-out rate is reduced, the operation and maintenance cost of the line is reduced, the operation reliability of the line is improved, and the operation risk of a power grid is reduced; the lightning protection level of the line can be improved, the safe operation of the line can be protected and the overall service life of the power transmission line can be prolonged by additionally arranging the lightning arrester bracket and the device from the whole life cycle cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of lightning arrester of direct current transmission line, specifically is a device that improves lightning resistance of direct current transmission tower. BACKGROUND

[0002] High voltage direct current transmission (HVDC) is a kind of technology for high-power long-distance transmission by using stable direct current.Due to the influence of inductive reactance and capacitive reactance of direct current and the absence of synchronization problem, HVDC has significant advantages in aspects such as connection between submarine cable transmission and asynchronous operation of alternating current system; the basic working principle of HVDC is to rectify three-phase alternating current into direct current through a converter station, and then send to another converter station to invert into three-phase alternating current.This mode is mainly composed of two converter stations and direct current transmission lines, and is suitable for scenarios where overhead lines are more than 600-800km and cable lines are more than 40-60km.

[0003] Extra-high voltage direct current transmission line has a transmission distance of more than 1000km, even up to 3000km.The line often passes through difficult traffic areas, has high altitude, complex and changeable geological and meteorological conditions, and has a great impact on the safe operation of the transmission line.In recent years, the transmission line often suffers from extreme weather such as strong wind, icing and lightning, and there are also unmanned sections such as high mountains and large ridges, and the operation and maintenance environment is extremely poor.

[0004] When lightning strikes, due to the protection of the ground wire, the ground wire forms a shielding arc, and as the amplitude of lightning current increases, the ground wire shielding arc gradually expands and the conductor exposed arc will eventually disappear, at this time the corresponding lightning current is the maximum shielding current.According to the accident line, due to the large amplitude of lightning back striking the tower, the air gap between the conductor and the horizontal tower body is broken down, resulting in line grounding fault.Obviously, the ground wire at this time cannot provide good protection to the conductor.Summarizing the extra-high voltage direct current line struck by lightning and caused grounding fault, when the large amplitude of lightning strikes the tower, the ground wire cannot form a shielding arc, resulting in lightning breakdown of the air gap between the conductor and the horizontal tower body. UTILITY MODEL CONTENTS

[0005] The utility model overcomes the defects of prior art, and provides a device for improving lightning resistance of direct current transmission tower; solve the problem that the air gap between the conductor and the horizontal tower body is broken down due to the large amplitude of lightning back striking the tower, resulting in line grounding fault.

[0006] In order to achieve the above purpose, the utility model is realized by the following technical scheme:

[0007] The utility model relates to a device that improves the lightning resistance of a DC transmission tower, comprising a tower body, left and right side pole conductor crossarms arranged on the left and right sides of the tower body, left and right side ground wire supports connected to the left and right side pole conductor crossarms, a right side conductor hanging point connected to the right side pole conductor crossarm via an insulator string, a left side conductor hanging point connected to the left side pole conductor crossarm via an insulator string, left and right side lightning arrester supports arranged on the left and right sides of the tower body, the left side lightning arrester support being arranged below the left side pole conductor crossarm and the right side lightning arrester support being arranged below the right side pole conductor crossarm, a right side lightning arrester upper electrode ring arranged below the right side conductor hanging point and a left side lightning arrester upper electrode ring arranged below the left side conductor hanging point, a right side lightning arrester lower electrode ring arranged below the right side lightning arrester upper electrode ring and a left side lightning arrester lower electrode ring arranged below the left side lightning arrester upper electrode ring, the distance between the right side lightning arrester upper electrode ring and the right side lightning arrester lower electrode ring and the distance between the left side lightning arrester upper electrode ring and the left side lightning arrester lower electrode ring both being the minimum breakdown distance, a right side electrode adjusting plate connected to the right side lightning arrester lower electrode ring and a left side electrode adjusting plate connected to the left side lightning arrester lower electrode ring, a plurality of right side lightning arrester elements connected to the right side electrode adjusting plate and a plurality of left side lightning arrester elements connected to the left side electrode adjusting plate.

[0008] Further, right side V-shaped insulator strings are hung on the left and right sides of the right side pole conductor crossarm and left side V-shaped insulator strings are hung on the left and right sides of the left side pole conductor crossarm.

[0009] Further, the right side lightning arrester upper electrode ring is arranged below the right side six-bundle conductor hanging point and the left side lightning arrester upper electrode ring is arranged below the left side six-bundle conductor hanging point.

[0010] Further, the right side lightning arrester elements are connected to the right side lightning arrester support via three insulators in three directions and the left side lightning arrester elements are connected to the left side lightning arrester support via three insulators in three directions.

[0011] Further, the right side lightning arrester elements are connected to the right side lightning arrester support via three insulators in three directions and the left side lightning arrester elements are connected to the left side lightning arrester support via three insulators in three directions.

[0012] The utility model has the following beneficial effects compared with the prior art:

[0013] The utility model discloses a lightning arrester support is added to the left and right sides of the DC tower body respectively, and the lightning arrester device is installed to the suitable position of the lower end of the conductor of the tower with the poor lightning protection performance, which can effectively improve the lightning protection performance of the line, reduce the lightning trip-out rate, reduce the line operation and maintenance cost, improve the reliability of the line operation and reduce the power grid operation risk.

[0014] Although the lightning arrester support and device increase a part of material quantity and a small amount of engineering cost, the line lightning strike level is improved, the safe operation of the line is protected, the later operation and maintenance cost is reduced and the overall service life of the transmission line is improved from the whole life cycle cost. DRAWINGS

[0015] Figure 1 It is the structure schematic diagram of the device for improving the lightning resistance of the DC transmission tower.

[0016] Figure 2 It is the partial structure schematic diagram of the device for improving the lightning resistance of the DC transmission tower.

[0017] Figure 3 It is the bottom view of the right lightning arrester support.

[0018] Figure 4 It is the top view of the right lightning arrester support.

[0019] Figure 5 It is the bottom view of the left lightning arrester support.

[0020] Figure 6 It is the top view of the left lightning arrester support.

[0021] In the drawing:

[0022] 1, tower body of iron tower, 2, right ground wire support, 3, left ground wire support, 4, right pole conductor cross arm, 5, left pole conductor cross arm, 6, right lightning arrester support, 7, left lightning arrester support, 8, right V-type insulator string, 9, left V-type insulator string, 10, right lightning arrester upper electrode ring, 11, left lightning arrester upper electrode ring, 12, right six-split conductor hanging point, 13, left six-split conductor hanging point, 14, right lightning arrester element, 15, left lightning arrester element, 16, stay insulator, 17, right circular pier, 18, left circular pier, 19, right lightning arrester lower electrode ring, 20, left lightning arrester lower electrode ring, 21, right side electrode adjusting plate, 22, left side electrode adjusting plate, 23, right lightning arrester base, 24, left lightning arrester base. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model clearer and more apparent, the utility model is further described in detail in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model. The technical scheme of the utility model is described in detail below in combination with embodiments and drawings, but the protection scope is not limited thereby.

[0024] Referring to Figures 1 to 6 The embodiment provides a device for improving lightning resistance of a direct-current transmission tower, which comprises a tower body 1, right side ground wire supports 2, left side ground wire supports 3, right pole conductor cross arms 4 and left pole conductor cross arms 5 are arranged on the tower body 1 respectively.

[0025] Right side V-shaped insulator strings 8 are hung on both sides of the right pole conductor cross arms 4, and left side V-shaped insulator strings 9 are hung on both sides of the left pole conductor cross arms 5; right side six-split conductor hanging points 12 are arranged below the right side V-shaped insulator strings 8, and left side six-split conductor hanging points 13 are arranged below the left side V-shaped insulator strings 9.

[0026] In order to prevent lightning from striking the tower, that is, lightning current from the right side six-split conductor hanging points 12 and the left side six-split conductor hanging points 13 breaks through the air gap between the horizontal tower body, a right lightning arrester upper electrode ring 10 is arranged below the right side six-split conductor hanging points 12, and a left lightning arrester upper electrode ring 11 is arranged below the left side six-split conductor hanging points 13.

[0027] According to the lightning air breakdown formula, the minimum breakdown distance is L2, a right lightning arrester lower electrode ring 19 is arranged at a distance of L2 below the right lightning arrester upper electrode ring 10, a left lightning arrester lower electrode ring 20 is arranged at a distance of L2 below the left lightning arrester upper electrode ring 11, a right side electrode adjusting plate 21 is connected below the right lightning arrester lower electrode ring 19, and a left side electrode adjusting plate 22 is connected below the left lightning arrester lower electrode ring 20. A plurality of right side lightning arrester elements 14 are connected below the right side electrode adjusting plate 21, the length of each right side lightning arrester element 14 is L1, a right lightning arrester base 23 is connected below the right side lightning arrester element 14 and a right circular pier 17, the right circular pier 17 is connected with a right lightning arrester support 6, and one end of the right lightning arrester support 6 is fixedly connected to the tower body 1.

[0028] Similarly, a plurality of left side lightning arrester elements 15 are connected below the left side electrode adjusting plate 22, the length of each left side lightning arrester element 15 is L1, a left lightning arrester base 24 is connected below the left side lightning arrester element 15 and a left circular pier 18, the left circular pier 18 is connected with a left lightning arrester support 7, and one end of the left lightning arrester support 7 is fixedly connected to the tower body 1.

[0029] In order to fix the right side arrester element 14, the stay insulator 16 is arranged in three directions respectively; similarly, in order to fix the left side arrester element 15, the stay insulator 16 is also arranged in three directions respectively.

[0030] The principle of the device for improving the lightning resistance of the DC transmission tower is provided in the embodiment:

[0031] The right side arrester support 6 and the left side arrester support 7 are newly added on the left and right sides of the tower body 1. By adding the lightning protection device at the appropriate position below the wire hanging point of the lightning protection performance unsatisfactory tower, the line lightning protection performance can be effectively improved, the lightning trip-out rate is reduced, the line operation and maintenance cost is reduced, the line operation reliability is improved, and the power grid operation risk is reduced. It has high social and economic benefits. The problem of large amplitude lightning back attack tower, air gap between conductor and horizontal tower body being broken down, leading to line grounding fault is solved.

[0032] By adding the arrester support and the related components of the arrester, although a part of material quantity and a small amount of engineering cost are increased, the line lightning strike level is improved, the safe operation of the line is protected, the later operation and maintenance cost is reduced, and the overall service life of the transmission line is improved from the whole life cycle cost.

[0033] The above content is a further detailed description of the utility model made in combination with the specific preferred embodiment, and cannot be determined that the specific implementation of the utility model is limited to this. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the premise of the utility model, a number of simple deductions or substitutions can be made, and all should be regarded as belonging to the utility model. The scope of patent protection is determined by the submitted claims.

Claims

1. A device for improving the lightning resistance of a DC transmission tower, comprising a tower body (1), wherein a left pole conductor crossarm (5) and a right pole conductor crossarm (4) are respectively provided on the left and right sides of the tower body (1); a left ground wire bracket (3) is connected to the left pole conductor crossarm (5), and a right ground wire bracket (2) is connected to the right pole conductor crossarm (4); the right pole conductor crossarm (4) is connected to a right conductor suspension point via an insulator string; the left pole conductor crossarm (5) is connected to a left conductor suspension point via an insulator string; characterized in that, A left surge arrester bracket (7) and a right surge arrester bracket (6) are respectively installed on the left and right sides of the tower body (1); the left surge arrester bracket (7) is located below the left pole conductor crossarm (5), and the right surge arrester bracket (6) is located below the right pole conductor crossarm (4). A right surge arrester upper electrode ring (10) is arranged below the right conductor suspension point, and a left surge arrester upper electrode ring (11) is arranged below the left conductor suspension point; a right surge arrester lower electrode ring (19) is arranged below the right surge arrester upper electrode ring (10), and a left surge arrester lower electrode ring (20) is arranged below the left surge arrester upper electrode ring (11); the distance between the right surge arrester upper electrode ring (10) and the right surge arrester lower electrode ring (19), and the distance between the left surge arrester upper electrode ring (11) and the left surge arrester lower electrode ring (20) are all minimum strike distances. The distance between the surge arrester and the left surge arrester is as follows: a right electrode adjustment plate (21) is connected below the lower electrode ring (19) of the right surge arrester, and a left electrode adjustment plate (22) is connected below the lower electrode ring (20) of the left surge arrester; several right surge arrester elements (14) are connected below the right electrode adjustment plate (21), and the right surge arrester elements (14) are connected to the right surge arrester bracket (6); several left surge arrester elements (15) are connected below the left electrode adjustment plate (22), and the left surge arrester elements (15) are connected to the left surge arrester bracket (7).

2. The device for improving the lightning resistance of DC transmission towers according to claim 1, characterized in that, Right V-shaped insulator strings (8) are hung on both sides of the right pole conductor crossarm (4), and left V-shaped insulator strings (9) are hung on both sides of the left pole conductor crossarm (5); right six-split conductor hanging point (12) is provided below the right V-shaped insulator string (8) and left six-split conductor hanging point (13) is provided below the left V-shaped insulator string (9).

3. The device for improving the lightning resistance of DC transmission towers according to claim 2, characterized in that, The upper electrode ring (10) of the right surge arrester is located below the right six-split conductor hanging point (12); the upper electrode ring (11) of the left surge arrester is located below the left six-split conductor hanging point (13).

4. The device for improving the lightning resistance of DC transmission towers according to claim 1, characterized in that, The right surge arrester element (14) is connected to the right circular pier (17) via the right surge arrester base (23) below it, and the right circular pier (17) is connected to the right surge arrester bracket (6); the left surge arrester element (15) is connected to the left circular pier (18) via the left surge arrester base (24) below it, and the left circular pier (18) is connected to the left surge arrester bracket (7).

5. The device for improving the lightning resistance of DC transmission towers according to claim 4, characterized in that, The right-side surge arrester element (14) is connected to the right-side surge arrester bracket (6) in three directions via three guy wire insulators (16); the left-side surge arrester element (15) is connected to the left-side surge arrester bracket (7) in three directions via three guy wire insulators (16).

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