CN113517101B - Lightning arrester - Google Patents
Lightning arrester Download PDFInfo
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- CN113517101B CN113517101B CN202110749199.8A CN202110749199A CN113517101B CN 113517101 B CN113517101 B CN 113517101B CN 202110749199 A CN202110749199 A CN 202110749199A CN 113517101 B CN113517101 B CN 113517101B
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- electrode
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- zinc oxide
- spark gap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
Abstract
The invention discloses a lightning arrester, because of the isolation function of the series pseudo spark gap formed by the upper hollow electrode, the middle electrode and the lower hollow electrode which are sequentially arranged along the shaft at intervals, when the circuit normally runs, a zinc oxide resistance sheet bears smaller continuous power frequency voltage, when the resistance sheet is degraded, the normal running of the circuit is not influenced, when the circuit is struck by lightning, the pseudo spark gap is punctured, the zinc oxide valve sheet is conducted, current is led into the ground to limit the voltage at the two ends of the zinc oxide resistance sheet, the normal work of an insulator and a lead is ensured, and the stability of power supply of a distribution network system under the lightning disaster is effectively improved The through-current capacity is stronger; the pseudo spark gap ablates less compared to a vacuum gap.
Description
Technical Field
The invention relates to lightning protection equipment, in particular to a lightning arrester.
Background
Lightning overvoltage is one of the important reasons for power system failure, seriously threatens power supply reliability and influences social production and resident life. In order to ensure reliable power supply, more and more overhead lines adopt insulated wires, but the insulated wires are easy to break after being struck by lightning, so that the improvement of the lightning protection measures of the power transmission and distribution lines plays a vital role in the safe and stable operation of a power system.
The common lightning protection measures of the power transmission and distribution line include: the method comprises the steps of erecting a lightning conductor, reducing tower grounding resistance, arranging a line arrester and the like. The lightning conductor can be erected to reduce direct lightning strike of the conductor, but the lightning protection effect on the distribution line with induced lightning overvoltage dominant is not obvious, and the investment cost is high. The grounding device can rapidly dissipate lightning current, reduce the grounding resistance of the grounding device and reduce the rise of ground potential, thereby ensuring the safety of personnel and equipment, but the lightning protection effect is not ideal in areas with strong lightning activity or high soil resistivity. The types of lightning arresters currently in common use are: a protective gap and a metal oxide arrester. The protective gap has a steep volt-second characteristic curve, forms a chopping wave after action, is influenced by environmental factors, and is difficult to extinguish arc; the metal oxide lightning arrester has the advantages of good protection performance, no follow current, large through-current energy and the like, but the zinc oxide valve plate not only needs to bear lightning overvoltage and operation overvoltage, but also needs to bear normal continuous operation voltage and temporary overvoltage. The arrester with the series gap has the advantages that due to the isolation effect of the series gap, the arrester body does not bear continuous power frequency voltage, only under the lightning surge overvoltage with higher amplitude, after the breakdown of the series gap, the arrester body bears overvoltage load, the arrester with the series gap can avoid the temporary overvoltage caused by the single-phase grounding of a system and the effect of arc grounding or resonance overvoltage on a resistor disc, but the arrester with the series gap has the defects of unstable discharge, easy influence of external environmental factors on the open air gap and the like, and certain risk exists in the safe operation of a circuit.
Disclosure of Invention
The invention aims to provide a lightning arrester to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lightning arrester comprises a pseudo spark gap assembly, a lightning arrester assembly and an umbrella skirt sheath; the pseudo spark gap assembly comprises an upper hollow electrode, a middle electrode and a lower hollow electrode which are coaxially arranged at intervals in sequence, a plurality of through holes are formed in one ends, close to the middle electrode, of the upper hollow electrode and one end, close to the middle electrode, of the lower hollow electrode, a plurality of through holes communicated with the upper hollow electrode and the lower hollow electrode are formed in the middle electrode, insulating cylinders are fixedly arranged on the outer rings of the upper hollow electrode, the middle electrode and the lower hollow electrode, a first electrode cover plate is arranged at the other end of the lower hollow electrode, and a vent pipe is arranged on the first electrode cover plate; the lightning arrester assembly comprises an insulating ring with a middle hollow structure, an upper flange and a lower flange are arranged at two ends of the insulating ring respectively, a zinc oxide valve block is arranged in the insulating ring (2.2), an electrode is arranged at the bottom of the zinc oxide valve block, a pseudo spark gap assembly is placed in the insulating ring, a second electrode cover plate is arranged between the pseudo spark gap assembly and the zinc oxide valve block, and the insulating ring is sleeved with a shed sheath.
Furthermore, both ends of the middle electrode are respectively provided with a concave structure, the middle part of the middle electrode is provided with a plate electrode provided with a plurality of through holes, one end of the upper hollow electrode and one end of the lower hollow electrode are both provided with a plurality of through holes, one end of the upper hollow electrode provided with the through holes is arranged in the concave structure at one end of the middle electrode, and one end of the lower hollow electrode provided with the through holes is arranged in the concave structure at the other end of the middle electrode.
Furthermore, the outer ring of the middle electrode is provided with a pouring lug, and two ends of the outer side of the middle electrode are respectively fixed with an insulating cylinder.
Further, the insulating cylinder is a ceramic insulating cylinder.
Furthermore, the distance between the upper hollow electrode and the lower hollow electrode is 2-3 mm.
Furthermore, the through holes on the upper hollow electrode, the middle electrode and the lower hollow electrode are coaxially arranged.
Furthermore, one end of each of the upper flange and the lower flange is provided with a counter bore, the counter bores are used for positioning the pseudo spark gap and the zinc oxide valve plate, and the diameter of each counter bore is not smaller than the diameter of the zinc oxide valve plate.
Furthermore, one end of the upper flange and one end of the lower flange are provided with a plurality of U-shaped grooves at equal intervals along the circumference, the insulating rings are placed, and circumferential positioning is achieved through the U-shaped grooves and the insulating rings.
Furthermore, the end parts of the upper flange and the lower flange are provided with connecting screw rods.
Furthermore, the umbrella skirt sheath is integrally pressed outside the lightning arrester component by adopting silicon rubber.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a lightning arrester, which comprises a pseudo spark gap component, a lightning arrester component and an umbrella skirt sheath, wherein an insulating ring with a hollow structure in the middle is adopted, an electrode, a zinc oxide valve plate and a pseudo spark gap component structure are sequentially arranged in the insulating ring, and due to the isolation effect of a series pseudo spark gap formed by an upper hollow electrode, a middle electrode and a lower hollow electrode which are sequentially arranged at intervals along an axis, when a circuit normally runs, the zinc oxide resistance plate bears a smaller continuous power frequency voltage, when the resistance plate is degraded, the normal running of the circuit cannot be influenced, when the circuit is struck by lightning, the pseudo spark gap is punctured, the zinc oxide valve plate is conducted, current is led into the ground, the voltage at the two ends of the circuit is limited, the normal working of an insulator and a lead is ensured, and the power supply stability of a distribution network system under the lightning disaster is effectively improved. The invention connects the false spark gap and the zinc oxide valve plate in series into a whole and is arranged in the umbrella skirt sheath, the closed false spark gap has stable discharge voltage and high reliability, and compared with the air gap, the false spark gap has stronger arc extinguishing capability, quicker action and stronger through-flow capability; the pseudo spark gap ablates less compared to a vacuum gap. The aim of lightning protection is achieved under the common cooperation of the zinc oxide valve plate and the pseudo spark gap.
Furthermore, the ceramic insulating cylinder is adopted, so that the insulating support effect is achieved, and the advantages of low leakage rate and good sealing performance are achieved.
Furthermore, the concave structures at the two ends of the middle electrode surround the upper hollow electrode and the lower hollow electrode, so that metal steam is prevented from being attached to the inner wall of the ceramic insulating barrel during discharging, and the discharging stability of the pseudo spark gap structure is improved.
Furthermore, through holes in the upper hollow electrode, the middle electrode and the lower hollow electrode are coaxially arranged to form a discharge channel, and when the through holes in the upper hollow electrode, the middle electrode and the lower hollow electrode are coaxial, a hollow cathode effect is generated during discharge, and electrode ablation is small.
Drawings
Fig. 1 is a schematic view of a lightning arrester according to an embodiment of the invention.
FIG. 2 is a schematic illustration of a pseudo spark gap assembly according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a lightning arrester assembly according to an embodiment of the invention.
Fig. 4 is a schematic structural view of an upper flange in the embodiment of the present invention.
Fig. 5 is a schematic diagram of an intermediate electrode structure according to an embodiment of the present invention.
Wherein, 1, a pseudo spark gap assembly; 1.1, an upper hollow electrode; 1.2, an intermediate electrode; 1.3, a lower hollow electrode; 1.4, a first electrode cover plate; 1.5, an insulating cylinder; 1.6, a second electrode cover plate; 2. a lightning arrester assembly; 2.1, zinc oxide valve plates; 2.2, an insulating ring; 2.3, an upper flange; 2.3.1, a U-shaped groove; 2.4, a lower flange; 2.5, electrodes; 3. umbrella skirt sheath.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 to 3, a lightning arrester includes a pseudo spark gap assembly 1, a lightning arrester assembly 2, and a shed sheath 3; the pseudo spark gap assembly 1 comprises an upper hollow electrode 1.1, a middle electrode 1.2 and a lower hollow electrode 1.3 which are coaxially arranged at intervals in sequence, one ends of the upper hollow electrode 1.1 and the lower hollow electrode 1.3 close to the middle electrode 1.2 are respectively provided with a plurality of through holes, the middle electrode 1.2 is provided with a plurality of through holes communicated with the upper hollow electrode 1.1 and the lower hollow electrode 1.3, the outer rings of the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are fixedly provided with an insulating cylinder 1.5, the other end of the lower hollow electrode 1.3 is provided with a first electrode cover plate 1.4, a vent pipe is arranged on the first electrode cover plate 1.4 and used for filling a gas medium into a sealed cavity formed among the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3, and the pseudo spark gap assembly 1 is clamped with the pipe when the gas pressure in the pseudo spark gap assembly 1 meets a reasonable gas pressure range; specifically, the interior of the pseudo spark gap component 1 is a low vacuum environment with the pressure of 1-100 Pa, and the discharge characteristic of the pseudo spark gap component is located on the left half branch of a Barshen curve; the lightning arrester assembly 2 comprises an insulating ring 2.2 with a hollow structure in the middle, two ends of the insulating ring 2.2 are respectively provided with an upper flange 2.3 and a lower flange 2.4, a zinc oxide valve block 2.1 is arranged in the insulating ring (2.2), the bottom of the zinc oxide valve block 2.1 is provided with an electrode 2.5, the pseudo spark gap assembly 1 is placed in the insulating ring 2.2, a second electrode cover plate 1.6 is arranged between the pseudo spark gap assembly 1 and the zinc oxide valve block 2.1, and the insulating ring 2.2 is sleeved with a shed sheath 3. The invention adopts the pseudo spark gap to reduce the aging speed and the self-damage rate of the zinc oxide valve plate, avoids the defects that the open gap is easily influenced by external environmental factors and the like, enhances the arc quenching capability of the gap, is beneficial to reducing the lightning trip-out rate and improving the lightning resistance level of a line and the reliability of power supply quality. Preferably, the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are arranged at equal intervals.
Two ends of the middle electrode 1.2 are respectively provided with a concave structure, the middle part of the middle electrode is provided with a plate electrode provided with a plurality of through holes, one end of the upper hollow electrode 1 and one end of the lower hollow electrode 1.3 are both provided with a plurality of through holes, one end of the upper hollow electrode 1 provided with the through holes is arranged in the concave structure at one end of the middle electrode 1.2, and one end of the lower hollow electrode 1.3 provided with the through holes is arranged in the concave structure at the other end of the middle electrode 1.2; the outer rings of the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are provided with an insulating cylinder 1.5.
As shown in fig. 5, the outer ring of the middle electrode 1.2 is provided with a pouring lug, i.e. an outer ring boss structure; the insulating cylinders 1.5 are fixedly connected, two ends of the outer side of the middle electrode 1.2 are respectively provided with one insulating cylinder 1.5, one insulating cylinder 1.5 is connected with the middle electrode 1.2 and the upper hollow electrode 1.1, and the other insulating cylinder 1.5 is fixedly connected with the middle electrode 1.2 and the lower hollow electrode 1.3.
Specifically, outside the pseudo spark gap assembly, a resistor is connected in parallel between the upper hollow electrode 1.1 and the middle electrode, and a capacitor is connected in parallel between the middle electrode and the lower hollow electrode 1.3, so that under the action of alternating voltage, the power frequency voltage born by the two gaps is equivalent, under the action of lightning impulse, the voltage born by the two gaps has a large difference, the action of the gaps is accelerated, and the discharge voltage of the gaps under the action of the impulse voltage is reduced on the premise of ensuring the withstand voltage of the power frequency of the gaps. When the lightning arrester provided by the invention is used in a region with higher soil resistivity, the lightning arrester can adapt to higher ground resistance by reducing the number of the lightning arrester valve plates connected in series. Under extreme conditions, even the arrester valve plates in series can be eliminated. When the number of gaps of the pseudo spark gap assembly is increased, the lightning arrester can be suitable for power transmission and distribution systems with different voltage levels.
The upper hollow electrode 1.1 and the lower hollow electrode 1.3 are both of variable diameter structures; the upper hollow electrode 1.1 is arranged in the concave structure at one end of the middle electrode 1.2 and is not contacted with the inner wall of the concave structure of the middle electrode 1.2, the other end of the upper hollow electrode 1.1 is coaxial with the outer ring of the middle electrode 1.2, and the outer wall of the upper hollow electrode 1.1 and the outer wall of the middle electrode 1.2 are both contacted and fixed with the inner wall of the insulating cylinder 1.5. The insulating cylinder 1.5 is a ceramic insulating cylinder, and after the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are arranged and fixed at intervals, the upper hollow electrode, the middle electrode and the lower hollow electrode are cast and formed by ceramic and fixed. Adopt ceramic insulating cylinder 1.5, play the insulating support effect on the one hand, on the other hand has the advantage that the leakage rate is low, the leakproofness is good. The ceramic insulating cylinder 1.5 is hermetically connected with the upper hollow electrode 1.1, the middle electrode 1.2, the lower hollow electrode 1.3 and the first electrode cover plate 1.4 in a ceramic-metal welding mode.
In the present embodiment, the ceramic-metal welding method includes laser welding, electron beam welding, solid phase welding; the ceramic-metal welding mode is adopted for sealing connection, the requirement that the air leakage rate is less than 10-8 Pa.L/s is met, and the small change of the air pressure and the stable discharge voltage in the service life cycle of the internal air pressure of the pseudo spark gap component 1 can be ensured.
Specifically, the distance between an upper hollow electrode 1.1, a middle electrode 1.2 and a lower hollow electrode 1.3 is 2-3 mm; preferably, the through holes of the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are coaxially arranged to form a discharge channel, and when the through holes of the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 are coaxial, a hollow cathode effect is generated during discharge.
The second electrode cover plate 1.6 is in contact with the first electrode cover plate 1.4 and is used for connecting the pseudo spark gap component 1 and the zinc oxide valve plate 2.1 in series, so that the pseudo spark gap component 1 and the zinc oxide valve plate 2.1 are in good contact.
And one ends of the upper flange 2.3 and the lower flange 2.4 are provided with countersunk holes, the depth of each countersunk hole is 5mm, and the diameter of each countersunk hole is not less than the diameter of the zinc oxide valve plate 2.1 and is used for placing the pseudo spark gap component 1 and the electrode 2.5. One end of the upper flange 2.3 is connected to one end of the upper hollow electrode 1.1 of the pseudo spark gap assembly 1, and one end of the lower flange 2.4 is connected to one end of the electrode 2.5.
As shown in fig. 4, a plurality of U-shaped grooves 2.3.1 are equally spaced along the circumference at one end of the upper flange 2.3 and the lower flange 2.4, a plurality of positioning rings are evenly arranged on the insulating ring 2.2 in the circumferential direction, and circumferential positioning is realized by the positioning of the U-shaped grooves 2.3.1 and the positioning rings. The insulating ring 2.2 plays a role of connecting the upper flange 2.3 and the lower flange 2.4, and the insulating ring 2.2, the upper flange 2.3 and the lower flange 2.4 tightly fix the pseudo spark gap component 1, the zinc oxide valve plate 2.1 and the electrode 2.5.
The end parts of the upper flange 2.3 and the lower flange 2.4 are provided with connecting screw rods. Specifically, the upper flange 2.3 and the lower flange 2.4 are identical in structure, screw holes are formed in the end portions of the upper flange and the lower flange, the top end of the screw rod 2.3.3 is screwed into the screw hole 2.3.2, the screw rod 2.3.3 is fixed with the upper flange 2.3 and the lower flange 2.4, and the lightning arrester can be fixed on a supporting cross arm of a line tower through the screw rod 2.3.3 by means of installing hardware fittings.
The umbrella skirt sheath 3 is integrally pressed by ultraviolet-resistant, electric corrosion-resistant and dirt-resistant silicon rubber, the outer diameters of all umbrella skirts on the umbrella skirt sheath 3 are the same, and the upper end face and the lower end face of each umbrella skirt are inclined planes with the same slope.
The lightning arrester is installed in parallel with the line insulator, protects the line insulator, and prevents the lightning stroke disconnection of the overhead line and the insulator flashover. The aim of lightning protection is achieved under the common cooperation of the zinc oxide valve plate and the pseudo spark gap. When the circuit normally runs, the zinc oxide resistance card bears smaller continuous power frequency voltage due to the isolation effect of the series pseudo spark gap formed by the upper hollow electrode 1.1, the middle electrode 1.2 and the lower hollow electrode 1.3 which are sequentially arranged at intervals along the shaft, and when the resistance card is degraded, the normal running of the circuit cannot be influenced. When the line is struck by lightning, the pseudo spark gap is broken down, the zinc oxide valve plate is conducted, current is led into the ground, the voltage at two ends of the zinc oxide valve plate is limited, the normal work of the insulator and the wire is ensured, and the stability of power supply of a distribution network system under the lightning disaster is effectively improved. The invention connects the false spark gap and the zinc oxide valve plate in series into a whole and is arranged in the umbrella skirt sheath, the closed false spark gap has stable discharge voltage and high reliability, and compared with the air gap, the false spark gap has stronger arc extinguishing capability, quicker action and stronger through-flow capability; the pseudo spark gap ablates less compared to a vacuum gap.
The series pseudo spark gap zinc oxide arrester adopts a zinc oxide arrester with a series gap for preventing lightning overvoltage and cutting off power frequency follow current, which is specified by standards of DL/T815 & 2012 ' metal oxide arrester with a jacket for alternating current transmission lines ' and GB/T32520 & 2016 ' metal oxide arrester with an out-of-band series gap (EGLA) for overhead transmission and distribution lines with alternating current of more than 1 kV.
The pseudo spark gap formed by the zinc oxide arrester in series isolates the system voltage, so that the voltage borne by the zinc oxide valve plate is very low when no lightning occurs, the zinc oxide valve plate is not influenced by power frequency voltage and operation overvoltage, and the service life of the zinc oxide valve plate is prolonged; when lightning strike occurs, the pseudo spark gap is broken down before the insulator, and due to the nonlinearity of the zinc oxide valve plate, the lightning current is quickly discharged to the ground through the zinc oxide valve plate with a low resistance value, so that the insulator can be effectively prevented from flashover, and lightning strike tripping and insulated wire breakage caused by insulator discharging are avoided.
Therefore, when a line is struck by lightning, the gap of the series pseudo spark gap zinc oxide lightning arrester designed by the invention can be broken down, the lightning overvoltage is limited below the flashover voltage of the insulator, and the line fault caused by lightning flashover can be prevented. By adopting the structure of connecting the pseudo spark gaps in series, when the system operates normally, the pseudo spark gaps isolate the system voltage, the zinc oxide valve plates bear very low voltage, the flowing current is extremely low, the aging speed and the self damage rate of the valve plates of the lightning arrester are reduced, the daily operation and maintenance are reduced, and the manpower and financial resources are saved. The closed pseudo spark gap structure is adopted, the power frequency follow current cutting capability can be enhanced, the influence of external environment air humidity, air density and the like is avoided, the air gap length change caused by wind swing of a circuit and lead looseness is effectively prevented, and the discharging stability is ensured. When a large current flows, the pseudo spark gap has strong current capacity, the ablation of the internal electrode is slight, the improvement of the nominal discharge current and the operation impact current is facilitated, the safety is high, and the service life is long. The volume is small, the leakproofness is good, the explosion-proof nature is strong, the maintenance cost is low, be applicable to built on stilts distribution lines, be particularly useful for built on stilts insulating line lightning protection.
The above examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. It will be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A lightning arrester is characterized by comprising a pseudo spark gap component (1), a lightning arrester component (2) and a shed sheath (3); the pseudo spark gap assembly (1) comprises an upper hollow electrode (1.1), a middle electrode (1.2) and a lower hollow electrode (1.3) which are coaxially arranged at intervals in sequence, a plurality of through holes are formed in one ends, close to the middle electrode (1.2), of the upper hollow electrode (1.1) and the lower hollow electrode (1.3), the middle electrode (1.2) is provided with a plurality of through holes communicated with the upper hollow electrode (1.1) and the lower hollow electrode (1.3), an insulating cylinder (1.5) is fixedly arranged on the outer ring of the upper hollow electrode (1.1), the middle electrode (1.2) and the lower hollow electrode (1.3), a first electrode cover plate (1.4) is arranged at the other end of the lower hollow electrode (1.3), and a vent pipe is arranged on the first electrode cover plate (1.4); the lightning arrester assembly (2) comprises an insulating ring (2.2) with a hollow structure in the middle, an upper flange (2.3) and a lower flange (2.4) are arranged at two ends of the insulating ring (2.2) respectively, a zinc oxide valve plate (2.1) is arranged in the insulating ring (2.2), an electrode (2.5) is arranged at the bottom of the zinc oxide valve plate (2.1), a second electrode cover plate (1.6) is arranged between the pseudo spark gap assembly (1) and the zinc oxide valve plate (2.1), a shed sheath (3) is sleeved on the outer side of the insulating ring (2.2), two ends of the middle electrode (1.2) are of a concave structure, the middle part of the middle electrode (1.2) is a plate provided with a plurality of through holes, a plurality of through holes are formed in one end of the upper hollow electrode (1.1) and one end of the lower hollow electrode (1.3), one end of the upper hollow electrode (1.1) provided with the through hole is arranged in a concave structure at one end of the middle electrode (1.2), and one end of the lower hollow electrode (1.3) is arranged in a concave structure at the other end of the middle electrode (1.2).
2. A lightning arrester according to claim 1, characterized in that the outer ring of the intermediate electrode (1.2) is provided with a casting lug, and an insulating cylinder (1.5) is fixed to each of the outer ends of the intermediate electrode (1.2).
3. A lightning arrester according to claim 1, characterized in that the insulating cylinder (1.5) is a ceramic insulating cylinder.
4. A lightning arrester according to claim 1, characterized in that the upper hollow electrode (1.1), the intermediate electrode (1.2) and the lower hollow electrode (1.3) are spaced apart by 2-3 mm.
5. A lightning arrester according to claim 1, characterized in that the through-holes in the upper hollow electrode (1.1), the intermediate electrode (1.2) and the lower hollow electrode (1.3) are arranged coaxially.
6. A lightning arrester according to claim 1 characterized in that the upper flange (2.3) and the lower flange (2.4) are each provided with a counter bore at one end for locating the dummy spark gap (1) and the zinc oxide valve plate (2.1), and the diameter of the counter bores is not less than the diameter of the zinc oxide valve plate (2.1).
7. A lightning arrester according to claim 1, characterized in that the upper flange (2.3) and the lower flange (2.4) are provided with a plurality of U-shaped grooves (2.3.1) at circumferentially equal intervals at one end for accommodating the insulating ring (2.2), and the circumferential positioning is realized by the positioning of the U-shaped grooves (2.3.1) and the insulating ring (2.2).
8. A lightning arrester according to claim 1, characterized in that the upper flange (2.3) and the lower flange (2.4) are provided with connecting screws at their ends.
9. A lightning arrester according to claim 1, characterized in that the shed sheath (3) is integrally pressed on the outside of the arrester assembly (2) by means of silicon rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110749199.8A CN113517101B (en) | 2021-07-01 | 2021-07-01 | Lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110749199.8A CN113517101B (en) | 2021-07-01 | 2021-07-01 | Lightning arrester |
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| Publication Number | Publication Date |
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| CN113517101A CN113517101A (en) | 2021-10-19 |
| CN113517101B true CN113517101B (en) | 2022-06-07 |
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| CN202110749199.8A Active CN113517101B (en) | 2021-07-01 | 2021-07-01 | Lightning arrester |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB730709A (en) * | 1950-10-07 | 1955-05-25 | E M P Electric Ltd | Improvements in electric surge arresters |
| US6493201B1 (en) * | 2000-01-21 | 2002-12-10 | Mcgraw-Edison Company | Spark gap retrofit module for surge arrester |
| CN106448960A (en) * | 2016-08-28 | 2017-02-22 | 国网浙江省电力公司湖州供电公司 | 35KV multi-gap anti-thunder insulator |
| CN108565084B (en) * | 2018-06-13 | 2024-04-12 | 泰州学院 | Novel series gap composite insulation metal oxide lightning arrester |
| CN108933383A (en) * | 2018-06-21 | 2018-12-04 | 广西电网有限责任公司电力科学研究院 | A kind of arrester in built in air gap |
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