Spark thorn type flexible grounding module and grounding construction method

Abstract

The present invention relates to a spark barb type flexible grounding module and a grounding construction method, comprising a first graphite grounding strip, a second graphite grounding strip, a graphite conductive sheet and three spark barb assemblies, wherein two long sides of the graphite conductive sheet are respectively connected to the spark barb assemblies, the second graphite grounding strip is arranged along the length direction of the graphite conductive sheet, one end of the second graphite grounding strip is flush with the short side of one end of the graphite conductive sheet, and the other end of the second graphite grounding strip is arranged to extend out of the graphite conductive sheet. The spark barb type flexible grounding module of the present invention has a variety of grounding components, and the three spark barb assemblies are respectively arranged on three edges of the graphite conductive sheet, each spark barb assembly has a plurality of discharge spikes, and the entire spark barb type flexible grounding module is introduced into the entire grounding network through the graphite grounding strip. When the equipment is struck by lightning, a spark discharge effect can be formed in the process of discharging lightning current, so that the soil resistivity around the grounding device is reduced, and the current is dispersed more easily.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection grounding devices, and in particular to a spark barb-type flexible grounding module and a grounding construction method. Background Art

[0002] The tower grounding device needs to discharge lightning current to the earth when the transmission line or the tower itself is struck by lightning, so that the potential rise of the tower itself is as small as possible, so as to reduce the lightning strike trip rate. Therefore, the design of the grounding device is very important for the lightning protection of the transmission line. The amplitude of the lightning current is generally in the range of 20 to 200 kA, which is much larger than the general power frequency grounding current. The increase in the current amplitude leads to an increase in the current density at various locations in the grounding body, thereby increasing the electric field strength, which is particularly obvious near the injection point of the grounding body. When the electric field strength exceeds the critical breakdown field strength of the soil, local spark discharge will occur, which is equivalent to the increase in the conductivity of the soil and the size of the grounding body. Therefore, under the action of a sufficiently strong impulse lightning current, the power frequency grounding resistance of the same grounding device is greater than its impulse grounding resistance. This feature is the spark effect. When lightning current dissipates through the grounding electrode, a very large field strength will appear around the grounding body. If it is greater than the breakdown field strength Ec of the soil, local discharge will occur. At the moment of discharge, a spark discharge effect will be generated in the soil where the electrode contacts, causing the physical properties of the soil to change. When the lightning current dissipates through the grounding electrode, it is equivalent to an increase in the size of the grounding electrode. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above technical problems and to provide a spark barb type flexible grounding module and a grounding construction method.

[0004] In order to solve the deficiencies of the above-mentioned technical problems, the technical solution adopted by the present invention is: a spark barb type flexible grounding module, comprising a first graphite grounding strip, a second graphite grounding strip, a graphite conductive sheet and three spark barb assemblies, wherein the graphite conductive sheet is a rectangular structure, the two short sides of the graphite conductive sheet are respectively connected to the first graphite grounding strip and the spark barb assemblies, the two long sides of the graphite conductive sheet are respectively connected to the spark barb assemblies, the second graphite grounding strip is arranged on one side of the graphite conductive sheet, the second graphite grounding strip is arranged along the length direction of the graphite conductive sheet, one end of the second graphite grounding strip is flush with the short side of one end of the graphite conductive sheet, and the other end of the second graphite grounding strip is arranged to extend out of the graphite conductive sheet.

[0005] As a further optimization of the spark barb type flexible grounding module of the present invention: the first graphite grounding strip, the second graphite grounding strip and the graphite conductive sheet are all graphite braided structures.

[0006] As a further optimization of a spark spike type flexible grounding module of the present invention: the spark spike assembly includes a long strip metal substrate, and a plurality of discharge spikes are evenly distributed on one side of the long side of the metal substrate.

[0007] As a further optimization of the spark barb type flexible grounding module of the present invention: the metal substrate of the spark barb assembly is directly woven together with the graphite conductive sheet, and the first graphite grounding strip and the second graphite grounding strip are sewn together with the graphite conductive sheet through fine wires.

[0008] As a further optimization of a spark barb type flexible grounding module of the present invention: the spark barb assembly includes a long strip metal substrate, a plurality of connecting holes are arranged side by side on one long side of the metal substrate, a fixed groove and a sliding groove are arranged side by side on the side end face of the other long side of the metal substrate, the fixed groove and the sliding groove are arranged along the length direction of the metal substrate, and the length of the sliding groove is longer than the length of the fixed groove, a plurality of fixed spikes are evenly distributed in the fixed groove, the fixed spikes are fixedly arranged in the fixed groove, and a movable spike is arranged in the sliding groove, the movable spike is composed of a sliding part and spikes evenly distributed on the sliding part, the sliding part is clamped in the sliding groove, and the spikes extend out of the sliding groove.

[0009] As a further optimization of the spark thorn type flexible grounding module of the present invention: a long strip adjustment hole is arranged on one side of the sliding groove corresponding to the side of the sliding groove of the metal substrate, and an adjustment handle is arranged on the side of the adjustment hole corresponding to the sliding part of the movable spike, and the adjustment handle is extended from the adjustment hole.

[0010] As a further optimization of the spark spike type flexible grounding module of the present invention: the distance between two adjacent discharge spikes in the movable spikes is the same as the distance between two adjacent fixed spikes.

[0011] As a further optimization of the spark spike type flexible grounding module of the present invention: the length of the fixed groove is the difference between the length of the sliding groove and half of the distance between two adjacent fixed spikes.

[0012] A grounding construction method: using an armored grounding down conductor, a graphite-based flexible grounding belt, a graphite-based flexible resistance-reducing cloth and the above-mentioned spark-thorn-type flexible grounding module to ground a desktop transformer or a pole-mounted switch.

[0013] A grounding construction method specifically comprises the following steps:

[0014] S1: Preparation before construction

[0015] Before construction, the site should be surveyed according to the design drawings to determine the construction plan, which includes the number or length of armored grounding down conductors, graphite-based flexible resistance-reducing cloth, spark-thorn-type flexible grounding modules, and non-metallic clamps;

[0016] S2: Digging a ground trench

[0017] Dig the main grounding trench in the original soil layer or the compacted cushion soil layer, and then dig the extension trench according to the number of spark barb type flexible grounding modules;

[0018] S3: Laying grounding materials

[0019] First, a layer of graphite-based flexible resistance-reducing cloth is laid in the grounding main trench, and then a graphite-based flexible grounding strip is laid on top of the graphite-based flexible resistance-reducing cloth. Then, the upper end of the armored grounding down conductor is connected to the grounding component of the desktop transformer or the pole switch through bolts, and the lower end of the armored grounding down conductor is connected to the graphite-based flexible grounding strip. Finally, a spark-thorn type flexible grounding module is placed in each epitaxial trench, and the second graphite grounding strip of the spark-thorn type flexible grounding module is connected to the graphite-based flexible grounding strip through a non-metallic clamp.

[0020] S4: Buried grounding device

[0021] When backfilling in the grounding trench, the backfill soil should not contain stones, plastics and construction waste. The soil should be compacted in layers during backfilling, and an anti-sinking layer with a height of 100mm to 300mm should be set on the top.

[0022] Beneficial Effects

[0023] 1. The spark thorn type flexible grounding module of the present invention has a variety of grounding components. Three spark thorn components are respectively arranged on three edges of the graphite conductive sheet. Each spark thorn component has a plurality of discharge spikes. The entire spark thorn type flexible grounding module is introduced into the entire grounding network through the graphite grounding belt. When the equipment is struck by lightning, a spark discharge effect can be formed in the process of discharging lightning current, so that the soil resistivity around the grounding device is reduced, and the current is dispersed more easily;

[0024] Second, the spark thorn type flexible grounding module of the present invention has adjustable active spikes, and the position of the active spikes can be changed by adjusting the handle according to the actual grounding requirements, thereby changing the number of overall discharge spikes of the spark thorn type flexible grounding module to meet various grounding requirements;

[0025] 3. The grounding construction method of the present invention cleverly combines the armored grounding down conductor, the graphite-based flexible grounding belt, the graphite-based flexible resistance-reducing cloth and the spark-thorn-type flexible grounding module together to form a grounding device. The grounding device has good grounding effect and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the spark barb type flexible grounding module in Example 1;

[0027] Figure 2 It is a structural schematic diagram of the spark barb assembly of the spark barb type flexible grounding module in Example 1;

[0028] Figure 3 It is a structural schematic diagram of the spark barb type flexible grounding module (initial state) in Example 2;

[0029] Figure 4 It is a structural schematic diagram of the spark barb type flexible grounding module (enhanced state) in Example 2;

[0030] Figure 5 This is a schematic structural diagram of the metal substrate of the spark barb type flexible grounding module in Example 2;

[0031] Figure 6 This is a schematic diagram of the positional relationship between the graphite-based flexible drag-reducing cloth and the graphite-based flexible grounding tape in Example 3;

[0032] Figure 7 This is a schematic diagram of the positional relationship of the spark barb type flexible grounding module in Example 3;

[0033] Figure 8 The structure of the spark barb assembly of the spark barb type flexible grounding module in Example 1 is shown in FIG. Figure II ;

[0034] Markings in the figure: 1. First graphite grounding strip, 2. Second graphite grounding strip, 3. Graphite conductive sheet, 4. Metal matrix, 5. Discharge spikes, 6. Connection holes, 7. Fixed grooves, 8. Sliding grooves, 9. Fixed spikes, 10. Movable spikes, 11. Adjustment holes, 12. Adjustment handles, 13. Graphite-based flexible resistance-reducing cloth, 14. Graphite-based flexible grounding strip, 15. Non-metallic clamps, 16. Spark thorn-type flexible grounding module. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] The technical solution of the present invention is further described below in conjunction with specific implementation methods.

[0037] Example 1

[0038] like Figure 1 and 2 As shown: a spark barb type flexible grounding module, including a first graphite grounding strip 1, a second graphite grounding strip 2, a graphite conductive sheet 3 and three spark barb assemblies, wherein the graphite conductive sheet 3 is a rectangular structure, the two short sides of the graphite conductive sheet 3 are respectively connected to the first graphite grounding strip 1 and the spark barb assembly, the two long sides of the graphite conductive sheet 3 are respectively connected to the spark barb assembly, the second graphite grounding strip 2 is arranged on one side of the graphite conductive sheet 3, the second graphite grounding strip 2 is arranged along the length direction of the graphite conductive sheet 3, one end of the second graphite grounding strip 2 is flush with the short side of one end of the graphite conductive sheet 3, and the other end of the second graphite grounding strip 2 is arranged protruding from the graphite conductive sheet 3. The first graphite grounding strip 1, the second graphite grounding strip 2 and the graphite conductive sheet 3 are all graphite braided structures.

[0039] The spark spike assembly includes a long strip metal substrate 4, and a plurality of discharge spikes 5 are evenly distributed on one side of the long side of the metal substrate 4. The metal substrate 4 is directly woven together with the graphite conductive sheet 3, and the first graphite grounding strip 1 and the second graphite grounding strip 2 are sewn together with the graphite conductive sheet 3 through fine wires. The shape of the discharge spike 5 can be Figure 2 The shapes shown in the figure have the same spacing between the discharge spikes 5. The shapes of the discharge spikes 5 can also be Figure 8 As shown, the spacing between the discharge spikes 5 is arranged in a small-large-large pattern, and the waste of the bird-proof needle plate can be processed and used.

[0040] Example 2

[0041] like Figure 3-5 As shown: a spark barb type flexible grounding module, including a first graphite grounding strip 1, a second graphite grounding strip 2, a graphite conductive sheet 3 and three spark barb assemblies, wherein the graphite conductive sheet 3 is a rectangular structure, the two short sides of the graphite conductive sheet 3 are respectively connected to the first graphite grounding strip 1 and the spark barb assembly, the two long sides of the graphite conductive sheet 3 are respectively connected to the spark barb assembly, the second graphite grounding strip 2 is arranged on one side of the graphite conductive sheet 3, the second graphite grounding strip 2 is arranged along the length direction of the graphite conductive sheet 3, one end of the second graphite grounding strip 2 is flush with the short side of one end of the graphite conductive sheet 3, and the other end of the second graphite grounding strip 2 is arranged protruding from the graphite conductive sheet 3. The first graphite grounding strip 1, the second graphite grounding strip 2 and the graphite conductive sheet 3 are all graphite braided structures.

[0042] The spark thorn assembly includes a long strip metal substrate 4, a plurality of connection holes 6 are arranged side by side on one long side of the metal substrate 4, a fixed groove 7 and a sliding groove 8 are arranged side by side on the side end face of the other long side of the metal substrate 4, the fixed groove 7 and the sliding groove 8 are arranged along the length direction of the metal substrate 4, and the length of the sliding groove 8 is longer than the length of the fixed groove 7, a plurality of fixed spikes 9 are evenly distributed in the fixed groove 7, the fixed spikes 9 are fixedly arranged in the fixed groove 7, and a movable spike 10 is arranged in the sliding groove 8, the movable spike 10 is composed of a sliding part and spikes evenly distributed on the sliding part, the sliding part is clamped in the sliding groove 8, and the spikes extend out of the sliding groove 8. The spacing between two adjacent discharge spikes 5 in the movable spike 10 is the same as the spacing between two adjacent fixed spikes 9, and the length of the fixed groove 7 is the difference between the length of the sliding groove 8 and half of the spacing between two adjacent fixed spikes 9. One end of the fixed groove 7 and the sliding groove 8 is flush.

[0043] A long strip-shaped adjustment hole 11 is provided on the side of the metal substrate 4 corresponding to the side of the sliding groove 8, and an adjustment handle 12 is provided on the side of the sliding portion of the movable spike 10 corresponding to the adjustment hole 11, and the adjustment handle 12 is extended from the adjustment hole 11. By pulling the adjustment handle 12, the movable spike 10 is driven to slide in the sliding groove 8. In the initial state, the movable spike 10 and the fixed spike 9 are in an aligned position. When the movable spike 10 slides to the other end of the sliding groove 8, the movable spike 10 and the fixed spike 9 are staggered with each other, and the number of discharge spikes of the entire spark spike type flexible grounding module increases.

[0044] Example 3

[0045] like Figure 6 and 7 As shown: A grounding construction method, specifically comprising the following steps:

[0046] S1: Preparation before construction

[0047] Before construction, the site should be surveyed according to the design drawings to determine the construction plan, which includes the number or length of armored grounding down conductors, graphite-based flexible resistance-reducing cloth, spark-thorn-type flexible grounding modules, and non-metallic clamps;

[0048] S2: Digging a ground trench

[0049] Dig the main grounding trench in the original soil layer or the compacted cushion soil layer, and then dig the extension trench according to the number of spark barb type flexible grounding modules;

[0050] S3: Laying grounding materials

[0051] First, a layer of graphite-based flexible resistance-reducing cloth 13 is laid in the grounding main trench, and then a graphite-based flexible grounding strip 14 is laid on the graphite-based flexible resistance-reducing cloth 13, and then the upper end of the armored grounding down conductor is connected to the grounding component of the desktop transformer or the pole switch through bolts, and the lower end of the armored grounding down conductor is connected to the graphite-based flexible grounding strip 14, and finally a spark-thorn type flexible grounding module 16 is placed in each epitaxial trench, and the second graphite grounding strip of the spark-thorn type flexible grounding module 16 is connected to the graphite-based flexible grounding strip 14 through a non-metallic clamp 15;

[0052] Under the premise of ensuring that the gap between the down conductor and the tower material (tower footboard) meets the requirements, the connection plate should be in the same direction as the tower material slope as much as possible;

[0053] If the down conductor needs to be bent (for example, a metal down conductor), the bending operation sequence starts from the connection plate and proceeds to the far side of the connection plate. The down conductor along the tower material (shoe plate) maintains the same slope as the tower material;

[0054] The down conductor is bent with a special cold bender. Pay attention to protecting the galvanized layer of the down conductor during operation. The part of the down conductor that runs along the protective cap, foundation column and pedestal surface should be perpendicular or parallel to the direction of the line (line angle bisector) when running horizontally, and should remain vertical when running up and down.

[0055] Check whether the surrounding area of ​​the tower material installation hole and the connecting plate are flat and clean. The down conductor should be as close as possible to the tower material (shoe plate), protective cap, foundation column and pedestal surface.

[0056] S4: Buried grounding device

[0057] When backfilling in the grounding trench, the backfill soil should not contain stones, plastics and construction waste. The soil should be compacted in layers during backfilling, and an anti-sinking layer with a height of 100mm to 300mm should be set on the top.

[0058] The grounding trench should be excavated in the original soil layer or the compacted cushion soil layer. When laying graphite-based flexible grounding bodies in the grounding trenches in rocky areas in mountainous areas or areas with high resistivity, a plain soil cushion layer of not less than 100 mm thick should be backfilled first, and then the soil without stones, construction waste, plastics and other debris should be compacted and backfilled in layers after laying.

[0059] In order to prevent the grounding body from being exposed due to erosion by rainwater, the surface can be solidified and protected after backfilling in areas with severe soil erosion.

[0060] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A spark thorn type flexible grounding module, characterized in that: The invention comprises a first graphite grounding strip (1), a second graphite grounding strip (2), a graphite conductive sheet (3) and three spark thorn assemblies, wherein the graphite conductive sheet (3) is a rectangular structure, two short sides of the graphite conductive sheet (3) are respectively connected to the first graphite grounding strip (1) and the spark thorn assemblies, two long sides of the graphite conductive sheet (3) are respectively connected to the spark thorn assemblies, the second graphite grounding strip (2) is arranged on one side of the graphite conductive sheet (3), the second graphite grounding strip (2) is arranged along the length direction of the graphite conductive sheet (3), one end of the second graphite grounding strip (2) is flush with the short side of one end of the graphite conductive sheet (3), and the other end of the second graphite grounding strip (2) is arranged to extend out of the graphite conductive sheet (3); The spark thorn assembly comprises a long strip metal substrate (4), a plurality of connection holes (6) are arranged side by side on one long side of the metal substrate (4), a fixing groove (7) and a sliding groove (8) are arranged side by side on the side end face of the other long side of the metal substrate (4), the fixing groove (7) and the sliding groove (8) are arranged along the length direction of the metal substrate (4), and the length of the sliding groove (8) is longer than the length of the fixing groove (7), a plurality of fixed spikes (9) are evenly distributed in the fixing groove (7), the fixed spikes (9) are fixedly arranged in the fixing groove (7), and a movable spike (10) is arranged in the sliding groove (8), the movable spike (10) consists of a sliding part and spikes evenly distributed on the sliding part, the sliding part is clamped in the sliding groove (8), and the spikes extend out of the sliding groove (8); The first graphite grounding belt (1), the second graphite grounding belt (2) and the graphite conductive sheet (3) are all graphite braided structures, the metal matrix (4) and the graphite conductive sheet (3) are directly woven together, and the first graphite grounding belt (1) and the second graphite grounding belt (2) are sewn together with the graphite conductive sheet (3) by means of fine wires; A long strip-shaped adjustment hole (11) is arranged on the side of the metal base (4) corresponding to the sliding groove (8), and an adjustment handle (12) is arranged on the side of the sliding portion of the movable spike (10) corresponding to the adjustment hole (11), and the adjustment handle (12) extends out of the adjustment hole (11).

2. The spark barb type flexible grounding module as claimed in claim 1, characterized in that: The distance between two adjacent discharge spikes (5) in the movable spikes (10) is the same as the distance between two adjacent fixed spikes (9).

3. The spark barb type flexible grounding module as claimed in claim 2, characterized in that: The length of the fixing groove (7) is the difference between the length of the sliding groove (8) and half of the distance between two adjacent fixing spikes (9).

4. A grounding construction method, characterized in that: The grounding of a desktop transformer or a pole switch is carried out by using an armored grounding down conductor, a graphite-based flexible grounding strip, a graphite-based flexible resistance-reducing cloth and the spark-thorn-type flexible grounding module described in claim 1, 2 or 3.

5. The grounding construction method according to claim 4, characterized in that: The specific steps include: S1: Preparation before construction Before construction, the site should be surveyed according to the design drawings to determine the construction plan, which includes the number or length of armored grounding down conductors, graphite-based flexible resistance-reducing cloth, spark-thorn-type flexible grounding modules, and non-metallic clamps; S2: Digging a ground trench Dig the main grounding trench in the original soil layer or the compacted cushion soil layer, and then dig the extension trench according to the number of spark barb type flexible grounding modules; S3: Laying grounding materials First, a layer of graphite-based flexible resistance-reducing cloth is laid in the grounding main trench, and then a graphite-based flexible grounding strip is laid on top of the graphite-based flexible resistance-reducing cloth. Then, the upper end of the armored grounding down conductor is connected to the grounding component of the desktop transformer or the pole switch through bolts, and the lower end of the armored grounding down conductor is connected to the graphite-based flexible grounding strip. Finally, a spark-thorn type flexible grounding module is placed in each epitaxial trench, and the second graphite grounding strip of the spark-thorn type flexible grounding module is connected to the graphite-based flexible grounding strip through a non-metallic clamp. S4: Buried grounding device When backfilling in the grounding trench, the backfill soil should not contain stones, plastics and construction waste. The soil should be compacted in layers during backfilling, and an anti-sinking layer with a height of 100mm to 300mm should be set on the top.

Images