CN113745975B - Gap type lightning arrester - Google Patents
Gap type lightning arrester Download PDFInfo
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- CN113745975B CN113745975B CN202010466284.9A CN202010466284A CN113745975B CN 113745975 B CN113745975 B CN 113745975B CN 202010466284 A CN202010466284 A CN 202010466284A CN 113745975 B CN113745975 B CN 113745975B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/02—Means for extinguishing arc
- H01T1/08—Means for extinguishing arc using flow of arc-extinguishing fluid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/15—Details of spark gaps for protection against excessive pressure
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Abstract
The invention discloses a gap type lightning arrester, which comprises an insulating cylinder, wherein a plurality of arc extinguishing cavities are arranged in the insulating cylinder, the insulating cylinder is connected with an arc extinguishing device, and when thunder comes, the arc extinguishing device can extinguish electric arcs in the arc extinguishing cavities. The lightning arrester is installed in parallel with the line insulator, and the whole insulation strength of the lightning arrester is smaller than that of the insulator, so that when a lightning stroke occurs on a line, lightning overvoltage firstly breaks down the lightning arrester to avoid flashover of the insulator, and a lightning protection effect is achieved. However, after the conventional gap type lightning arrester flashover occurs in the gap, the power frequency electric arc between the gaps is difficult to extinguish in time, and the lightning protection effect is difficult to ensure. The discharge gap is built in, the electric arc is divided into a plurality of sections of short electric arcs through the plurality of middle electrodes so as to reduce the arc extinguishing difficulty, the air electric arc is impacted through the circulation of oil so as to thoroughly extinguish the power frequency electric arc, the lightning protection and arc extinguishing double functions are realized, and the lightning protection reliability is greatly improved.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution line arresters, in particular to a gap type arrester.
Background
Lightning strikes are the greatest risks faced by the safe and stable operation of power transmission and distribution systems. The conventional lightning protection measures for the overhead transmission line, such as the erection of a lightning conductor, the reduction of tower ground resistance, the installation of a conventional lightning arrester and the like, adopt the means of blocking a lightning current leakage path to block the release of destructive energy, and have the advantages of high cost, high difficulty and low reliability. In the conventional lightning arresters commonly used in the current power transmission and distribution lines, the zinc oxide lightning arresters have poor lightning current discharge capacity, are easy to age and have high failure rate, and the gap type lightning arresters cannot automatically extinguish power frequency short-circuit current. For some special areas with frequent and violent lightning activities, extremely large lightning current amplitude and frequent multiple back strikes in lightning, the conventional lightning arrester cannot meet the requirements. The development of a novel lightning arrester with large current capacity, no leakage current and long service life has become a general requirement of the industry.
Disclosure of Invention
Aiming at the problems of the existing lightning arrester, the invention provides a gap type lightning arrester which has the functions of arc extinguishing and lightning protection, and is high in through-current capacity and reliability.
The invention adopts the following technical scheme:
the utility model provides a clearance type arrester, includes insulating casing, is equipped with a plurality of arc extinguishing chamber in the insulating casing, and insulating casing is connected with arc control device, and when the arrester was hit in the thunder and lightning, arc control device can extinguish the electric arc in the arc extinguishing chamber.
Preferably, the insulating shell is a cuboid sealed shell.
Preferably, a first partition plate and a second partition plate are arranged in the insulating shell along the width direction of the insulating shell, a middle cavity is formed between the first partition plate and the second partition plate, a left cavity is formed between the first partition plate and the insulating shell, and a right cavity is formed between the second partition plate and the insulating shell.
Preferably, the material of the insulating housing, the first partition plate and the second partition plate is resin, silicon rubber, epoxy plate, bakelite plate, diphenyl ether plate or organic silicon plate.
Preferably, the top of the middle cavity is provided with a grounding side electrode, the bottom of the middle cavity is provided with a high-voltage side electrode, a plurality of middle electrodes are transversely arranged in the middle cavity from top to bottom, two sides of each middle electrode are fixedly connected with the inner walls of the first partition plate and the second partition plate respectively, and arc extinguishing cavities are formed between the adjacent middle electrodes, between the middle electrode at the uppermost end and the grounding side electrode and between the middle electrode at the lowermost end and the high-voltage side electrode.
Preferably, 3 to 6 oil through holes are provided on the first partition plate and the second partition plate at the side of each arc extinguishing chamber.
Preferably, the grounding side electrode is connected with the tower support through a first outgoing line, and the high-voltage side electrode is connected with the high-voltage lead through a second outgoing line.
Preferably, the arc extinguishing device comprises an oil cavity and a stepping motor, wherein a piston is arranged in the oil cavity, oil is arranged in the oil cavity on one side of the piston, the piston is connected with the stepping motor through a push rod, and the stepping motor is positioned on the right outer side of the oil cavity;
the cover has compression spring on the push rod, and compression spring's one end links to each other with the piston, and compression spring's the other end links to each other with the right side inner wall of oil pocket.
Preferably, the oil chamber is communicated with the right chamber, the stepping motor drives the piston to move through the push rod, oil is pressed into the right chamber, the oil entering the right chamber enters the arc extinguishing chamber through the oil through hole in the second partition plate, and flows into the left chamber through the oil through hole in the first partition plate.
Preferably, the oil is 25# transformer oil or 40# transformer oil, which has good arc extinguishing characteristics.
Preferably, the arc extinguishing device further comprises an induction coil, the induction coil is connected to the second outgoing line, and the induction coil is connected with the stepping motor.
Preferably, the induction coil is an induction power-taking device based on a rogowski coil, and the induction coil comprises a current transformer, a capacitor rectifying and filtering unit, a protection unit, a standby battery unit and the like.
Preferably, after the lightning strikes the lightning arrester, the induction coil obtains energy from the lightning surge, and the induction coil provides a working signal and temporary driving electric energy for the stepping motor.
The invention has the beneficial effects that:
aiming at the defect that the power frequency electric arc between the gaps of the conventional gap type lightning arrester is difficult to extinguish in time after the gap of the conventional gap type lightning arrester is subjected to flashover, the invention provides the technical scheme that the discharge gap is internally arranged, the electric arc is divided into a plurality of short electric arcs through a plurality of intermediate electrodes so as to reduce the arc extinguishing difficulty, the power frequency electric arc is impacted through the circulation of oil so as to thoroughly extinguish the power frequency electric arc, the dual functions of lightning protection and arc extinguishing are realized, and the lightning protection reliability is greatly improved. The electric part of the gap type lightning arrester is provided by lightning current energy, the performance is stable and reliable, the trouble that the gap type lightning arrester is difficult to extinguish arc for a long time is solved, and the gap type lightning arrester inherits the advantages of large current capacity, reliability and durability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a gap type arrester according to the present invention;
fig. 2 is a diagram showing an implementation process of the gap type arrester.
1. Insulating casing, 2, arc extinguishing chamber, 3, first baffle, 4, second baffle, 5, left cavity, 6, right cavity, 7, ground connection side electrode, 8, high-voltage side electrode, 9, middle electrode, 10, first lead-out wire, 11, shaft tower support, 12, second lead-out wire, 13, high-voltage wire, 14, oil pocket, 15, step motor, 16, piston, 17, oil, 18, push rod, 19, compression spring, 20, induction coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
Combine fig. 1 and fig. 2, a clearance type arrester, including insulating casing 1, be equipped with a plurality of arc extinguishing chamber 2 in the insulating casing, insulating casing is connected with arc control device, and when the arrester was hit in the thunder and lightning, arc control device can extinguish the electric arc in the arc extinguishing chamber.
The insulating shell is a cuboid sealed shell.
Of course, the insulating casing may also be a sealed barrel with an elliptical end face, and the shape of the insulating casing is not fixed.
When the insulating casing is the sealed casing of cuboid, be provided with first baffle 3 and second baffle 4 along insulating casing's width direction in the insulating casing, form a middle cavity between first baffle and the second baffle, be left cavity 5 between first baffle and the insulating casing, be right cavity 6 between second baffle and the insulating casing.
Further, the material of the insulating housing, the first partition plate and the second partition plate is resin, silicon rubber or epoxy plate.
The top of the middle cavity is provided with a grounding side electrode 7, the bottom of the middle cavity is provided with a high-voltage side electrode 8, a plurality of middle electrodes 9 are transversely arranged in the middle cavity from top to bottom, and two sides of each middle electrode are fixedly connected with the inner walls of the first partition plate and the second partition plate respectively.
Between the adjacent intermediate electrode, between the uppermost intermediate electrode and the ground side electrode, and between the lowermost intermediate electrode and the high voltage side electrode are arc extinguishing chambers 2.
3 to 6 oil through holes are arranged on the first partition plate and the second partition plate on the side part of each arc extinguishing cavity.
The oil through hole is a passage for oil to enter and exit the arc extinguishing chamber.
The quantity and the size of oil through holes are not fixed, and the quantity and the size of the oil through holes are based on that oil can rapidly enter an arc extinguishing cavity to extinguish electric arcs.
The grounding side electrode 7 is connected with a tower support 11 through a first outgoing line 10, and the high-voltage side electrode 8 is connected with a high-voltage lead 13 through a second outgoing line 12.
The arc extinguishing device comprises an oil cavity 14 and a stepping motor 15, a piston 16 is arranged in the oil cavity, oil 17 is arranged in the oil cavity on one side of the piston, the piston is connected with the stepping motor 15 through a push rod 18, and the stepping motor is located on the right outer side of the oil cavity.
The push rod is sleeved with a compression spring 19, one end of the compression spring is connected with the piston, and the other end of the compression spring is connected with the right inner wall of the oil cavity.
The oil is 25# transformer oil, and the oil has good arc extinguishing characteristics.
The oil cavity is communicated with the right cavity, the stepping motor drives the piston to move through the push rod, oil is pressed into the right cavity, the oil entering the right cavity enters the arc extinguishing cavity through the oil through hole in the second partition plate, and flows into the left cavity from the oil through hole in the first partition plate.
The arc extinguishing device further comprises an induction coil 20, the induction coil is connected to the second outgoing line, and the induction coil is connected with the stepping motor.
The induction coil is an induction power taking device based on the Rogowski coil and comprises a current transformer, a capacitor rectification filtering unit, a protection unit, a standby battery unit and the like.
After lightning strikes the arrester, the induction coil obtains energy from lightning surge, and the induction coil provides working signals and temporary driving electric energy for the stepping motor.
When the lightning arrester is used, the lightning arrester is connected with the line insulator in parallel, and the whole insulation strength of the lightning arrester is smaller than that of the insulator, so that when a lightning stroke occurs on a line, lightning overvoltage firstly breaks through the lightning arrester, the insulator is prevented from flashover, and the lightning protection effect is achieved.
After lightning overvoltage comes, the gap inside the lightning arrester breaks down, the grounding side electrode, the middle electrode and the high-voltage side electrode are conducted to form a plurality of sections of electric arcs, the induction coil generates signals and electric energy and sends the signals and the electric energy to the stepping motor, the stepping motor controls the piston to move leftwards quickly, the piston extrudes oil to enter a right cavity, the oil in the right cavity enters an arc extinguishing cavity through an oil through hole in the second partition plate and impacts power frequency electric arcs in the arc extinguishing cavity, and the power frequency electric arcs are extinguished. The oil rushing into the arc extinguishing chamber flows into the left cavity from the oil through hole on the first partition plate.
The invention divides the electric arc into a plurality of short electric arcs through a plurality of intermediate electrodes to reduce the arc extinguishing difficulty, and impacts the power frequency electric arc through the circulation of oil to thoroughly extinguish the power frequency electric arc, thereby having the double functions of lightning protection and arc extinguishing.
When the stepping motor has working signals and electric energy, the stepping motor can drive the piston to rapidly push leftwards for one time, after the working signals and the electric energy disappear, the piston can restore to an initial state under the action of the compression spring, and oil can automatically flow back into the oil cavity.
This arrester is through many clearances series discharge, and utilizes thunder and lightning self energy to extinguish the power frequency afterflow that produces after discharging, sees from the theory of operation, for ordinary arrester possesses following advantage: 1. the conventional gap type lightning arrester has the advantages of large current capacity of the conventional gap type lightning arrester because the conventional gap type lightning arrester has poor power frequency follow current extinguishing capability, and simultaneously overcomes the defect that the conventional gap type lightning arrester is difficult to extinguish power frequency follow current; 2. the core lightning protection element MOV (metal oxide) of the zinc oxide arrester has the defect of leakage current naturally, and the leakage current of the core lightning protection element MOV increases along with the increase of the operating age until the core lightning protection element MOV is scrapped, so that the arrester overcomes the defects, eliminates the leakage current, has no easily damaged element in the whole through-current path, and has greatly prolonged service life compared with the zinc oxide arrester; 3. through calculation and sample test, the lightning arrester at least reaches the technical level of 2.4C of lightning discharge capacity, 30kA of maximum current pulse (8/20us) and 30 times of arc extinguishing times, and exceeds the conventional lightning arrester with the same voltage grade.
Example 2
The utility model provides a clearance type arrester, includes insulating casing 1, is equipped with a plurality of arc extinguishing chambeies 2 in the insulating casing, and insulating casing is connected with arc control device, and when the arrester was hit in the thunder and lightning, arc control device can extinguish the electric arc in the arc extinguishing chamber.
The insulating shell is a cuboid sealed shell.
Of course, the insulating housing may also be a sealed barrel body with an elliptical end face, and the shape of the insulating housing is not fixed.
When the insulating shell is a cuboid sealed shell, a first partition plate 3 and a second partition plate 4 are arranged in the insulating shell along the width direction of the insulating shell, a middle cavity is formed between the first partition plate and the second partition plate, a left cavity 5 is arranged between the first partition plate and the insulating shell, and a right cavity 6 is arranged between the second partition plate and the insulating shell.
Further, the material of the insulating housing, the first partition plate and the second partition plate is bakelite plate, diphenyl oxide plate or organic silicon plate.
The top of the middle cavity is provided with a grounding side electrode 7, the bottom of the middle cavity is provided with a high-voltage side electrode 8, a plurality of middle electrodes 9 are transversely arranged in the middle cavity from top to bottom, and two sides of each middle electrode are fixedly connected with the inner walls of the first partition plate and the second partition plate respectively.
3 to 6 oil through holes are arranged on the first partition plate and the second partition plate on the side part of each arc extinguishing cavity.
The oil through hole is a passage for oil to enter and exit the arc extinguishing cavity.
The quantity and the size of oil through holes are not fixed, and the quantity and the size of the oil through holes are based on that oil can rapidly enter an arc extinguishing cavity to extinguish electric arcs.
The grounding side electrode 7 is connected with a tower support 11 through a first outgoing line 10, and the high-voltage side electrode 8 is connected with a high-voltage lead 13 through a second outgoing line 12.
The arc extinguishing device comprises an oil cavity 14 and a stepping motor 15, wherein a piston 16 is arranged in the oil cavity, oil 17 is arranged in the oil cavity on one side of the piston, the piston is connected with the stepping motor 15 through a push rod 18, and the stepping motor is positioned on the right outer side of the oil cavity.
The push rod is sleeved with a compression spring 19, one end of the compression spring is connected with the piston, and the other end of the compression spring is connected with the right inner wall of the oil cavity.
The oil is No. 40 transformer oil, and the oil has good arc extinguishing characteristic.
The oil cavity is communicated with the right cavity, the stepping motor drives the piston to move through the push rod, oil is pressed into the right cavity, the oil entering the right cavity enters the arc extinguishing cavity through the oil through hole in the second partition plate, and flows into the left cavity from the oil through hole in the first partition plate.
The arc extinguishing device further comprises an induction coil 20, the induction coil is connected to the second outgoing line, and the induction coil is connected with the stepping motor.
The induction coil is an induction power taking device based on the Rogowski coil and comprises a current transformer, a capacitor rectification filtering unit, a protection unit, a standby battery unit and the like.
After lightning strikes the arrester, the induction coil obtains energy from lightning surge, and the induction coil provides working signals and temporary driving electric energy for the stepping motor.
When the lightning arrester is used, the lightning arrester is installed in parallel with a line insulator, and the whole insulation strength of the lightning arrester is smaller than that of the insulator, so that when a lightning stroke occurs on a line, lightning overvoltage firstly breaks down the lightning arrester to avoid flashover of the insulator, and a lightning protection effect is achieved.
After the lightning overvoltage comes, the internal clearance of the lightning arrester is broken down, the grounding side electrode, the middle electrode and the high-voltage side electrode are conducted to form a multi-section electric arc, the induction coil generates a signal and electric energy and sends the signal and the electric energy to the stepping motor, the stepping motor controls the piston to move leftwards rapidly, the piston extrudes oil to enter the right cavity, the oil in the right cavity enters the arc extinguishing cavity through the oil through hole in the second partition plate, impacts a power frequency electric arc in the right cavity, and the power frequency electric arc is extinguished. The oil rushing into the arc extinguishing chamber flows into the left cavity from the oil through hole on the first partition plate.
The invention divides the electric arc into a plurality of short electric arcs through a plurality of intermediate electrodes to reduce the arc extinguishing difficulty, and impacts the power frequency electric arc through the circulation of oil to thoroughly extinguish the power frequency electric arc, thereby having the double functions of lightning protection and arc extinguishing.
When the stepping motor has working signals and electric energy, the stepping motor can drive the piston to rapidly push leftwards once, after the working signals and the electric energy disappear, the stepping motor can restore to an initial state under the action of the compression spring, and oil can automatically flow back into the oil cavity.
This arrester discharges through many clearances series connection, and utilizes thunder and lightning self energy to extinguish the power frequency afterflow that produces after discharging, sees from the theory of operation, for ordinary lightning arrester is equipped with following advantage: 1. the conventional gap type lightning arrester has the advantages of large current capacity of the conventional gap type lightning arrester because the conventional gap type lightning arrester has poor power frequency follow current extinguishing capability, and simultaneously overcomes the defect that the conventional gap type lightning arrester is difficult to extinguish power frequency follow current; 2. the core lightning protection element MOV (metal oxide) of the zinc oxide arrester has the defect of leakage current naturally, and the leakage current of the core lightning protection element MOV increases along with the increase of the operating age until the core lightning protection element MOV is scrapped, so that the arrester overcomes the defects, eliminates the leakage current, has no easily damaged element in the whole through-current path, and has greatly prolonged service life compared with the zinc oxide arrester; 3. through calculation and sample test, the lightning arrester at least reaches the technical level of 2.4C of lightning discharge capacity, 30kA of maximum current pulse (8/20us) and 30 times of arc extinguishing times, and exceeds the conventional lightning arrester with the same voltage grade.
Example 3
The number of the middle electrodes and the oil through holes arranged on the lightning arrester under different voltage levels follows the gap discharge rule, the higher the voltage level is, the more the number of the required discharge cavities is, and the number of the corresponding middle electrodes and the oil through holes is increased.
And (3) result simulation calculation and verification test, wherein the number of the intermediate electrodes can be set according to the following formula, and good arc quenching and lightning protection effects can be achieved:
N＝0.2U+4(6kV≤U＜35kV) (1)
N＝0.2U+6(35kV≤U) (2)
wherein N is the number of the middle electrodes, and U is the voltage grade of the power transmission line with the unit of kV.
The oil through holes are arranged on two sides of the discharge cavity, the number of the oil through holes is 4, the number of the oil through holes is 2 respectively on the left and the right of the discharge cavity, and the number of the oil through holes is selected according to the following formula
n＝4*(N+1) (3)
Wherein, N is the number of the middle electrodes, and N is the number of the oil through holes.
The common voltage classes are exemplified by the number of intermediate electrodes and oil through holes:
TABLE 1 examples of the number of the intermediate electrodes and the oil through holes corresponding to the commonly used voltage classes
| Voltage class (kV) | 6 | 10 | 35 | 66 | 110 | 220 | 330 | 500 |
| Number of |
5 | 6 | 13 | 19 | 28 | 50 | 72 | 106 |
| Number n of oil through holes | 24 | 28 | 56 | 80 | 116 | 204 | 292 | 428 |
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (4)
1. A gap type lightning arrester is characterized by comprising an insulating shell, wherein a plurality of arc extinguishing cavities are arranged in the insulating shell, the insulating shell is connected with an arc extinguishing device, and when lightning strikes the lightning arrester, the arc extinguishing device can extinguish electric arcs in the arc extinguishing cavities;
the insulating shell is a cuboid sealed shell;
a first partition plate and a second partition plate are arranged in the insulating shell along the width direction of the insulating shell, a middle cavity is formed between the first partition plate and the second partition plate, a left cavity is formed between the first partition plate and the insulating shell, and a right cavity is formed between the second partition plate and the insulating shell;
the insulating shell, the first partition plate and the second partition plate are made of insulating materials such as resin, silicon rubber, epoxy plates, bakelite plates, diphenyl ether plates or organic silicon plates;
the top of the middle cavity is provided with a grounding side electrode, the bottom of the middle cavity is provided with a high-voltage side electrode, a plurality of middle electrodes are transversely arranged in the middle cavity from top to bottom, two sides of each middle electrode are fixedly connected with the inner walls of the first partition plate and the second partition plate respectively, and arc extinguishing cavities are formed among the adjacent middle electrodes, between the middle electrode at the uppermost end and the grounding side electrode and between the middle electrode at the lowermost end and the high-voltage side electrode;
3 to 6 oil through holes are formed in the first partition plate and the second partition plate on the side of each arc extinguishing cavity;
the grounding side electrode is connected with the tower support through a first outgoing line, and the high-voltage side electrode is connected with the high-voltage lead through a second outgoing line;
the arc extinguishing device comprises an oil cavity and a stepping motor, wherein a piston is arranged in the oil cavity, oil is arranged in the oil cavity on one side of the piston, the piston is connected with the stepping motor through a push rod, and the stepping motor is positioned on the right outer side of the oil cavity; a compression spring is sleeved on the push rod, one end of the compression spring is connected with the piston, and the other end of the compression spring is connected with the right inner wall of the oil cavity;
the oil cavity is communicated with the right cavity, the stepping motor drives the piston to move through the push rod, oil is pressed into the right cavity, the oil entering the right cavity enters the arc extinguishing cavity through the oil through hole in the second partition plate and flows into the left cavity from the oil through hole in the first partition plate;
the arc extinguishing device further comprises an induction coil, the induction coil is connected to the second outgoing line, and the induction coil is connected with the stepping motor.
2. A gap type arrester according to claim 1, wherein the oil is 25# transformer oil or 40# transformer oil, and the oil has good arc extinguishing characteristics.
3. The gap type arrester as claimed in claim 1, wherein the induction coil is an induction power-taking device based on a rogowski coil, and the induction coil includes a current transformer, a capacitor rectifying and filtering unit, a protection unit and a backup battery unit.
4. A gap-type arrester according to claim 1 wherein the induction coil is adapted to pick up energy from a surge of lightning after the lightning strikes the arrester, the induction coil providing an operating signal and temporary driving power to the stepper motor.
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| CN113328340A (en) * | 2021-04-23 | 2021-08-31 | 广西雷闪电气科技有限公司 | Liquid recoil arc extinguishing lightning protection method |
| CN117543342B (en) * | 2024-01-10 | 2024-05-24 | 福建万嘉宝线缆有限公司 | High-voltage power grid lightning arrester with self-protection spark gap |
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| CN102486954A (en) * | 2010-12-02 | 2012-06-06 | 王巨丰 | Multi-interspace self-expanding strong-airflow arc extinguishing lightning protection device |
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