CN216958854U

CN216958854U - Lightning arrester

Info

Publication number: CN216958854U
Application number: CN202122700580.3U
Authority: CN
Inventors: 柳力; 吴欣洋; 王瑞珏; 肖孟金; 花媛
Original assignee: Wuxi Tongteng Composites Co ltd
Current assignee: Wuxi Tongteng Composites Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-07-12
Anticipated expiration: 2031-11-05

Abstract

The utility model discloses a lightning arrester, which comprises a vertical discharge system and a multi-cavity system, wherein the vertical discharge system is arranged on a synthetic sheath of a lightning arrester, an electrode comprises an upper electrode and a lower electrode, the upper electrode and the lower electrode are respectively arranged along the axial direction of the lightning arrester at intervals, the upper electrode is positioned above the lower electrode, and a discharge gap is formed between the upper electrode and the lower electrode; a multi-cavity system is annularly arranged on a synthetic sheath of the lightning arrester; the spherical electrodes are arranged in an annular array along the side wall of the synthetic sheath, arc extinguishing chambers are arranged at two adjacent spherical electrodes and are positioned on the synthetic sheath, the arc extinguishing chambers are cavities with single-side openings, and the openings of the arc extinguishing chambers are arc nozzles; the lightning arrester has the advantages of simple structure, good protection performance, difficult element aging caused by moisture and the like. The device does not depend on the size of the grounding resistor of the product, so that the pole tower grounding resistor has no special requirement, and particularly for the circuit in the mountainous area, the product is convenient to install, and the grounding cost is saved.

Description

Lightning arrester

Technical Field

The utility model belongs to the technical field of lightning arresters, and particularly relates to a lightning arrester.

Background

An arrester is an electrical appliance used to protect electrical equipment from high transient overvoltage and to limit the freewheel time and also to normally limit the freewheel value. The main material is zinc oxide. Lightning arresters are usually connected between the grid line and the earth, sometimes also alongside the windings or between the lines of the electrical appliance.

Chinese patent CN212874187U discloses a series gap type metal zinc oxide arrester, including the arrester body, install the power equipment who is connected with the wire through the drainage ring on the arrester body outer wall, the power equipment bottom is installed the joint ring that is connected with the arrester body through the insulator support and is carried out ground protection, fixed mounting has anti-tripping all around along the insulator support on the joint ring outer wall, the arrester body includes and is connected with the metal end and is vertical superimposed zinc oxide valve block, the epoxy glass steel plug of fixing on the bottom plate is installed to zinc oxide valve block center department, be equipped with the trapezoidal mouth that is connected with the zinc oxide valve block on the epoxy glass steel core rod, there is an epoxy glass steel section of thick bamboo zinc oxide valve block outer wall one side through the polymer filling layer connection. Has the advantages that: the lightning arrester does not act under the overvoltage with low amplitude of single-phase grounding, so that the lightning arrester is isolated from a system, and is in clearance conduction during overvoltage, the lightning arrester discharges, and equipment and the lightning arrester are effectively protected;

in the prior art, the power frequency voltage tolerance capability of a valve plate of the zinc oxide arrester is closely related to the action duration, and the problems of thermal breakdown, aging and the like of the zinc oxide arrester are easily caused by long-term high-frequency power frequency voltage.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve the above problems of the background art, and an object of the present invention is to provide a lightning arrester.

The purpose of the utility model can be realized by the following technical scheme:

the lightning arrester comprises a vertical discharge system and a multi-cavity system, wherein the vertical discharge system is arranged on a synthetic sheath of the lightning arrester and comprises electrodes, the electrodes comprise an upper electrode and a lower electrode, the upper electrode and the lower electrode are respectively arranged along the axial direction of the lightning arrester at intervals, the upper electrode is positioned above the lower electrode, and a discharge gap is formed between the upper electrode and the lower electrode; a multi-cavity system is annularly arranged on a synthetic sheath of the lightning arrester; the multi-cavity system comprises a plurality of spherical electrodes, electric arc nozzles and arc extinguish chambers, wherein the spherical electrodes are arranged in an annular array along the side wall of a synthetic sheath, the arc extinguish chambers are arranged at two adjacent spherical electrodes and are positioned on the synthetic sheath, the arc extinguish chambers are cavities with single-side openings, and the openings of the arc extinguish chambers are the electric arc nozzles; the multi-cavity system forms a discharge channel under the action of lightning impulse, and overvoltage levels at two ends of the insulator are suppressed.

As a further scheme of the utility model: a single zinc oxide valve plate is arranged in a heat-shrinkable sealing tube of the lightning arrester, a single synthetic sheath is sleeved on the outer wall of the heat-shrinkable sealing tube, and an electrode is arranged on the synthetic sheath; the top end of the zinc oxide valve plate is connected with the upper wiring terminal through an aluminum terminal block, and the joint between the upper wiring terminal and the thermal shrinkage sealing tube is provided with upper sealant.

As a further scheme of the utility model: the upper wiring terminal is provided with a connecting plate, one end of the connecting plate, which is far away from the upper wiring terminal, is provided with an electrode, and the bottom end of the zinc oxide valve plate is connected with the lower wiring terminal.

As a further scheme of the utility model: the bottom of pyrocondensation sealed tube is provided with the base, and the base passes through fastening bolt to be installed on power equipment.

As a further scheme of the utility model: the heat-shrinkable sealing tube and the zinc oxide valve plate, and the electrode and the synthetic sheath are sealed and filled in a vacuum infusion mode.

As a further scheme of the utility model: the synthetic sheath is a silicon rubber umbrella disk.

As a further scheme of the utility model: a plurality of zinc oxide valve plates are arranged in a thermal shrinkage sealing tube of the lightning arrester at equal intervals.

As a further scheme of the utility model: the outer wall of the thermal shrinkage sealing tube of the lightning arrester with a plurality of groups of zinc oxide valve plates is correspondingly sleeved with a plurality of synthetic sheaths.

As a further scheme of the utility model: the synthetic sheaths at the two ends are respectively provided with an upper electrode and a lower electrode.

As a further scheme of the utility model: the upper and lower sides of the plurality of synthetic sheaths in the middle are respectively provided with an upper electrode and a lower electrode.

Compared with the prior art, the utility model has the beneficial effects that:

the first is to use a multi-lumen system that uses a simple quenching technique. The principle is that electric arc passes through a product body, disperses a large electric arc into a series of small electric arcs, and sprays the electric arc into air through small arc-extinguishing chambers, and due to the cooling effect of the air and the increase of the resistance of an arc channel, the power frequency electric arc is extinguished at the first zero crossing point. The function is exerted, the high-frequency power frequency voltage finishes the lightning leakage action through the simple quenching technology, and the defect of the zinc oxide lightning arrester is overcome. However, the function has certain requirements on lightning overvoltage, when the overvoltage is too small, the arc extinguishing chamber cannot reach a certain temperature, high-pressure gas cannot be formed, so that the electric arc cannot be elongated out of the arc extinguishing chamber, and the zinc oxide lightning arrester has the advantages that the lower power frequency voltage and residual voltage after the multi-cavity system acts can be decomposed.

The second is to utilize the vertical discharge system, the advantages of the metallic zinc oxide arrester: basically has no follow current, light action load, strong repeated action resistance, symmetrical volt-ampere characteristic, no polarity problem and large current capacity, thereby being used as a second path for lightning discharge. As is well known, the power frequency voltage tolerance capability of a valve plate of the zinc oxide arrester is closely related to the action duration, and the problems of thermal breakdown, aging and the like of the zinc oxide arrester are easily caused by long-term high-frequency power frequency voltage.

Therefore, the two lightning arresters are utilized to supplement each other by utilizing the advantages and characteristics of the lightning arrester when the lightning strike occurs, so that the lightning leakage function of the lightning arrester without worry is achieved.

Under the action of normal working voltage, the power frequency voltage of each chamber distributed in the multi-chamber system is less than 200V, a large margin is reserved, the arc extinguishing performance of the lightning arrester is reliable, and the lightning arrester is matched with another lightning discharge path zinc oxide valve plate part, so that the respective defects are overcome. The device has the advantages of simple structure, good protection performance, difficult element aging caused by moisture and the like. The device does not depend on the size of the grounding resistor of the product, so that the pole tower grounding resistor has no special requirement, and particularly for the circuit in the mountainous area, the product is convenient to install, and the grounding cost is saved. The lightning protection device can play a good role in lightning protection and lightning relief on the lightning overvoltage of a 10kV overhead transmission line.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the arrester containing a single group of zinc oxide valve plates.

Fig. 2 is a schematic structural diagram of the arrester comprising a plurality of groups of zinc oxide valve plates.

FIG. 3 is a schematic view of a multi-lumen system of the present invention;

FIG. 4 is a waveform diagram of voltage and current generated without follow current when the amplitude of the power frequency voltage is 2.5 KV;

FIG. 5 is a waveform diagram of voltage and current generated without follow current when the amplitude of the power frequency voltage is 3 KV.

In the figure: 1. an upper wiring terminal; 2. applying a sealant; 3. an aluminum terminal block; 4. a multi-lumen system; 5. a heat-shrinkable sealing tube; 6. an electrode; 7. a zinc oxide valve plate; 8. synthesizing a sheath; 9. a lower connection terminal; 10. a base; 41. a spherical electrode; 42. an arc spout; 43. an arc extinguishing chamber.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 and 3, the lightning arrester includes a 10kV no-worry lightning arrester, the 10kV no-worry lightning arrester includes an upper wiring terminal 1, an upper sealant 2, an aluminum terminal block 3, a multi-cavity system 4, a heat-shrinkable sealing tube 5, an electrode 6, a zinc oxide valve sheet 7, a synthetic sheath 8, a lower wiring terminal 9, and a base 10; a single zinc oxide valve plate 7 is arranged in the heat-shrinkable sealing tube 5, the top end of the zinc oxide valve plate 7 is connected with an upper wiring terminal 1 through an aluminum terminal base 3, an upper sealant 2 is arranged at the joint between the upper wiring terminal 1 and the heat-shrinkable sealing tube 5, the tightness of the connection between the upper wiring terminal 1 and the heat-shrinkable sealing tube 5 is ensured by arranging the upper sealant 2, a connecting plate is arranged on the upper wiring terminal 1, an electrode 6 is arranged at one end of the connecting plate, which is far away from the upper wiring terminal, the bottom end of the zinc oxide valve plate 7 is connected with a lower wiring terminal 9, a base 10 is arranged at the bottom end of the heat-shrinkable sealing tube 5, and the base 10 is arranged on power equipment through a fastening bolt;

the heat-shrinkable sealing tube 5 and the zinc oxide valve plate 7, and the electrode 6 and the synthetic sheath 8 are sealed and filled in a vacuum infusion mode to be mutually bonded, and the heat-shrinkable sealing tube 5 and the zinc oxide valve plate 7, and the electrode 6 and the synthetic sheath 8 have good bonding performance through vacuum infusion, so that air in glue and structural gaps is eliminated; after the filling glue is filled, the sealing solid insulation is formed by heating and curing, so that the valve plate, the heat-shrinkable sealing tube and the electrode in the lightning arrester form a whole, and therefore, the lightning arrester has the advantages that no cavity is formed in the lightning arrester, and the fault that the insulation is reduced due to the moisture entering caused by respiration cannot occur;

a single synthetic sheath 8 is sleeved on the outer wall of the heat-shrinkable sealing tube 5, the synthetic sheath 8 is a silicon rubber umbrella disc, an electrode 6 is arranged on the synthetic sheath 8, and a multi-cavity system 4 is also arranged on the synthetic sheath 8; the multi-cavity system 4 is located on the side wall of the synthetic sheath 8, the multi-cavity system comprises a plurality of spherical electrodes 41, arc nozzles 42 and arc extinguishing chambers 43, the spherical electrodes 41 are arranged in an annular array along the side wall of the synthetic sheath 8, the arc extinguishing chambers 43 are arranged at two adjacent spherical electrodes 41, the arc extinguishing chambers 43 are located on the synthetic sheath 8, the arc extinguishing chambers 43 are cavities with single-side openings, and the openings of the arc extinguishing chambers 43 are the arc nozzles 42; the multi-cavity system forms a discharge channel under the action of lightning impulse, so that overvoltage levels at two ends of the insulator are inhibited, electric arcs are extinguished in a short time, the line can be prevented from being tripped by lightning stroke, and the insulator connected with the multi-cavity system in parallel is protected.

Example 2

Referring to fig. 2, the difference between a 35kV lightning arrester and a 10kV lightning arrester is: a plurality of zinc oxide valve plates 7 are arranged in a heat-shrinkable sealing tube 5 of the lightning arrester containing a plurality of groups of zinc oxide valve plates 7 at equal intervals, a plurality of synthetic sheaths 8 are correspondingly sleeved on the outer wall of the heat-shrinkable sealing tube 5 of the lightning arrester containing the plurality of groups of zinc oxide valve plates 7, the synthetic sheaths 8 positioned at two ends are provided with a single electrode 6, the plurality of synthetic sheaths 8 positioned in the middle are provided with two electrodes 6, and the two electrodes 6 are respectively positioned at the upper side and the lower side of the synthetic sheaths 8;

the lightning arresters of example 1 and example 2, both had two lightning paths. One is a multi-cavity system using a "simple quenching technique". As is known to all, the power frequency voltage tolerance capability of a valve plate of a zinc oxide arrester is closely related to the action duration, the zinc oxide arrester is easy to cause the problems of thermal breakdown, aging and the like when being subjected to high-frequency power frequency voltage for a long time, and the characteristics of a multi-cavity system are adopted as a first lightning leakage way of a careless lightning arrester through research and design aiming at the problems. The principle is that electric arc passes through a product body, disperses a large electric arc into a series of small electric arcs, and sprays the electric arc into air through small arc-extinguishing chambers, and due to the cooling effect of the air and the increase of the resistance of an arc channel, the power frequency electric arc is extinguished at the first zero crossing point. The function is exerted, the high-frequency power frequency voltage finishes the lightning relief action through the simple arc quenching technology, and the defect of the zinc oxide lightning arrester is overcome.

One is to combine the advantages of metallic zinc oxide arresters: basically has no follow current, light action load, strong repeated action resistance, symmetrical volt-ampere characteristic, no polarity problem and large current capacity, thereby being used as another path for lightning discharge.

Because the multi-cavity system has certain requirements on lightning overvoltage, when the overvoltage is too small, the arc extinguishing chamber cannot reach a certain temperature, high-pressure gas cannot be formed, so that the electric arc cannot be elongated out of the arc extinguishing chamber, and the advantages of the zinc oxide lightning arrester can decompose the lower power frequency voltage and residual voltage after the multi-cavity system acts. When lightning stroke occurs, the advantages of the two lightning arresters are utilized to supplement each other, so that the lightning leakage function of the lightning arrester is achieved.

The lightning arrester reasonably exerts the excellent voltage limiting characteristic of the zinc oxide valve plate, the power frequency follow current cutting-off capability of a multi-cavity system and the pollution resistance, aging resistance and tracking resistance of the skirt material silicon rubber are good, and various materials and structures are fully utilized, namely the excellent performances of the materials and the structures are exerted and supplemented.

Test example 1

1.1 Power frequency continuous flow cut-off test

Through a power frequency follow current cut-off test, whether the lightning arrester can reliably cut off electric arcs under the power frequency voltage condition is tested, and the arc quenching performance of the lightning arrester is tested. The test is carried out by using an impact-power frequency combined test loop.

The test voltage and current waveform results can be shown in fig. 4, and no power-frequency follow current is generated when the power-frequency voltage at two ends of the test sample is lower as shown in fig. 4; when the power frequency voltage at two ends is higher, as shown in fig. 5, under the action of the power frequency voltage, the electric discharge is continuously carried out through the flashover channel to form power frequency follow current, the electric arc is extinguished at the first zero crossing point, and no re-ignition occurs, so that the requirement that the test sample does not re-ignite under the action of the power frequency voltage is met;

power frequency follow current test data of the following table under different power frequency voltages

According to the fact that arc-shaped path voltage drop shows certain fluctuation during power frequency follow current, in 5-8 numbered tests, the lowest value of the arc-shaped path voltage drop is basically unchanged, and the highest value of the arc-shaped path voltage drop is increased along with the increase of the power frequency voltage amplitude; after the power frequency follow current amplitude is increased to a certain degree, the arc-shaped path pressure drop is obviously improved, and the test is carried out in groups of 9-10 according to the serial number. The phenomenon is related to the arc blowing effect, the larger the follow current is, the more the arc blowing effect is obvious, the more the arc is elongated, the larger the arc path resistance is, and the larger the arc path voltage drop is.

From the above test results, it is considered that the multi-chamber arrester has a good arc quenching performance, and can reliably quench power frequency arcs of IkA or less.

1.2 study of lightning impulse test

And (3) carrying out a lightning impulse test on the lightning arrester, wherein in the test process, the accuracy of 50% impulse breakdown voltage is obtained. According to "high voltage insulation technology", the voltage is adjusted to 4 to 6 breakdowns for 10 applications of the voltage, and the voltage value can be regarded as 50% of the impulse breakdown voltage.

The test was carried out with a gap distance of 45mm, and the positive polarity lightning impulse 50% discharge voltage was 86.9kVp and the negative polarity lightning impulse 50% discharge voltage was 93.7 kVp. As in the following table:

test of volt-second characteristics of lightning impulse

Test for volt-second characteristics of lightning impulse (corrected to standard atmospheric conditions)

And (4) integrating the test results. Under the effect of power frequency voltage or impulse voltage, the voltage distribution of the lightning arrester is relatively uniform. In addition, ten lightning impulse tests show that no obvious ablation trace is seen on the surface of the electrode, and the discharge characteristic of the electrode is not greatly influenced.

The comprehensive test data preliminarily determines that the 50% discharge voltage of the lightning impulse is about 80kV, and the requirement that the 50% discharge voltage of the carefree lightning impulse is 75-130 kV is met.

The working principle of the utility model is as follows: the lightning arrester not only discharges the thunder through the electrode 6 consisting of the upper electrode and the lower electrode, but also can further discharge the thunder through a multi-cavity system consisting of the spherical electrode 41, the arc nozzle 42 and the arc extinguishing chamber 43, and is a brand new lightning arrester which gives consideration to a zinc oxide lightning arrester and a multi-cavity arc blowing type lightning arrester; the lightning arrester not only has the advantages of a zinc oxide lightning arrester, but also has the characteristics of a multi-cavity system; the lightning arrester combines the advantages of a zinc oxide valve plate in a zinc oxide lightning arrester and the principle of the simple quenching technology of a multi-cavity arc-blowing type lightning arrester, and is a brand-new lightning arrester;

the first is to use a multi-lumen system that uses a simple quenching technique. The principle is that electric arcs pass through a product body, one large electric arc is dispersed into a series of small electric arcs, the electric arcs are sprayed into air through small arc-extinguishing chambers, and due to the cooling effect of the air and the increase of the resistance of an electric arc path, power frequency electric arcs are extinguished when the electric arcs pass through zero for the first time. The function is exerted, the high-frequency power frequency voltage finishes lightning discharge action through a simple arc quenching technology, and the defect of the zinc oxide lightning arrester is overcome. However, the function has certain requirements on lightning overvoltage, when the overvoltage is too small, the arc extinguishing chamber cannot reach a certain temperature, high-pressure gas cannot be formed, so that the electric arc cannot be elongated out of the arc extinguishing chamber, and the zinc oxide lightning arrester can decompose the lower power frequency voltage.

The second is to utilize the advantages of the vertical discharge system, the metal zinc oxide arrester: basically has no follow current, light action load, strong repeated action resistance, symmetrical volt-ampere characteristic, no polarity problem and large current capacity, thereby being used as a second path for lightning discharge. As is well known, the power frequency voltage tolerance capability of a valve plate of the zinc oxide arrester is closely related to the action duration, and the problems of thermal breakdown, aging and the like of the zinc oxide arrester are easily caused by long-term high-frequency power frequency voltage.

The lightning arrester is characterized in that the lightning arrester is subjected to structural analysis and experimental research, according to the maximum running phase voltage of a 10kV system, under the action of normal working voltage, the power frequency voltage of each chamber distributed in a multi-chamber system is less than 200V, a large margin is reserved, the reliable arc extinguishing performance of the lightning arrester is guaranteed, the lightning arrester is matched with another lightning discharge path zinc oxide valve plate part, and the respective defects are overcome. The device has the advantages of simple structure, good protection performance, difficult element aging caused by moisture and the like. The device does not depend on the size of the grounding resistor of the product, so that the pole tower grounding resistor has no special requirement, and particularly for the circuit in the mountainous area, the product is convenient to install, and the grounding cost is saved. The lightning protection device can play a good role in lightning protection and lightning relief on the lightning overvoltage of a 10kV overhead transmission line.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not exhaustive and do not limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. Lightning arrester, its characterized in that: the lightning arrester comprises a vertical discharge system and a multi-cavity system (4), wherein the vertical discharge system is arranged on a synthetic sheath (8) of the lightning arrester and comprises an electrode (6), the electrode (6) comprises an upper electrode and a lower electrode, the upper electrode and the lower electrode are respectively arranged at intervals along the axial direction of the lightning arrester, the upper electrode is positioned above the lower electrode, and a discharge gap is formed between the upper electrode and the lower electrode; a multi-cavity system (4) is annularly arranged on a synthetic sheath (8) of the lightning arrester; the multi-cavity system comprises a plurality of spherical electrodes (41), arc nozzles (42) and arc extinguishing chambers (43), wherein the spherical electrodes (41) are arranged in an annular array along the side wall of the synthetic sheath (8), the arc extinguishing chambers (43) are arranged at the positions of two adjacent spherical electrodes (41), the arc extinguishing chambers (43) are positioned on the synthetic sheath (8), the arc extinguishing chambers (43) are cavities with single-side openings, and the openings of the arc extinguishing chambers (43) are the arc nozzles (42); the multi-cavity system forms a discharge channel under the action of lightning impulse, and overvoltage levels at two ends of the insulator are suppressed.

2. The lightning arrester according to claim 1, characterized in that a single zinc oxide valve plate (7) is arranged in the heat-shrinkable sealing tube (5) of the lightning arrester, a single synthetic sheath (8) is sleeved on the outer wall of the heat-shrinkable sealing tube (5), and an electrode (6) is arranged on the synthetic sheath (8); the top end of the zinc oxide valve plate (7) is connected with the upper wiring terminal (1) through the aluminum terminal base (3), and the upper sealant (2) is arranged at the joint between the upper wiring terminal (1) and the heat-shrinkable sealing tube (5).

3. A lightning arrester according to claim 1, characterized in that the upper terminal (1) is provided with a connecting plate, an electrode (6) is provided at the end of the connecting plate remote from the upper terminal, and the bottom end of the zinc oxide valve plate (7) is connected to the lower terminal (9).

4. A lightning protection device according to claim 1, characterized in that the bottom end of the heat shrinkable sealing tube (5) is provided with a base (10), the base (10) being mounted on the electrical equipment by means of fastening bolts.

5. A lightning arrester according to claim 3, characterized in that the space between the heat-shrinkable tube (5) and the zinc oxide sheet (7) and the space between the electrode (6) and the synthetic sheath (8) are filled by vacuum infusion.

6. A lightning protection device according to claim 1, characterized in that the synthetic sheath (8) is a silicone rubber umbrella disc.

7. A lightning conductor according to claim 1, characterized in that a plurality of zinc oxide valve plates (7) are arranged at equal intervals in the heat-shrinkable sealing tube (5) of the lightning conductor.

8. A lightning arrester according to claim 7, characterized in that the outer wall of the heat-shrinkable sealing tube (5) of the arrester with the plurality of groups of zinc oxide valve plates (7) is correspondingly sleeved with a plurality of synthetic sheaths (8).

9. A lightning protection device according to claim 8, characterized in that the synthetic sheaths (8) at both ends are provided with an upper and a lower electrode, respectively.

10. A lightning conductor according to claim 9, characterized in that the upper and lower sides of the composite sheaths (8) in the middle are provided with an upper and a lower electrode, respectively.