CN111431034A - Multi-chamber vacuum arrester with series resistor discs - Google Patents
Multi-chamber vacuum arrester with series resistor discs Download PDFInfo
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- CN111431034A CN111431034A CN202010356860.4A CN202010356860A CN111431034A CN 111431034 A CN111431034 A CN 111431034A CN 202010356860 A CN202010356860 A CN 202010356860A CN 111431034 A CN111431034 A CN 111431034A
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- electrode
- inner core
- zinc oxide
- vacuum
- insulating inner
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000011787 zinc oxide Substances 0.000 claims abstract description 38
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000032683 aging Effects 0.000 description 6
- 230000005684 electric field Effects 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H01T1/16—Series resistor structurally associated with spark gap
-
- 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
- H01T1/20—Means for starting arc or facilitating ignition of spark gap
- H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes
-
- 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
- H01T4/02—Details
-
- 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
- H01T4/16—Overvoltage arresters using spark gaps having a plurality of gaps arranged in series
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- Thermistors And Varistors (AREA)
Abstract
The invention relates to a series resistance card multi-chamber vacuum arrester, which comprises an arrester shell, an insulating inner core, an electrode group and a zinc oxide resistance card insulating inner core, wherein the arrester shell is internally provided with the insulating inner core, the insulating inner core is internally provided with a cylindrical vacuum chamber along the center, the electrode group and the zinc oxide resistance card are both arranged in the vacuum chamber, the electrode group comprises an upper electrode, a lower electrode and a middle electrode group, the middle electrode group is arranged between the upper electrode and the lower electrode, and mutually isolated vacuum arc extinguishing gaps are formed between the upper electrode and the adjacent middle electrode, between the lower electrode and the adjacent middle electrode and between the two adjacent middle electrodes. Compared with the existing multi-chamber lightning arrester, the lightning arrester has the advantages of no cutoff wave, no influence of environmental factors on the action characteristics of gaps and the like, and compared with the common zinc oxide lightning arrester, the lightning arrester has the advantages of large through-current capacity, no leakage current and the like.
Description
Technical Field
The invention relates to the technical field of lightning protection equipment, in particular to a series resistor disc multi-chamber vacuum arrester.
Background
The lightning arrester is used for protecting various electrical equipment in an electric power system from being damaged by lightning overvoltage, operation overvoltage and power frequency transient overvoltage impact. The types of arresters are mainly protection gap, valve type arresters and zinc oxide arresters. The protective gap lightning arrester is mainly used for limiting atmospheric overvoltage and is generally used for protecting incoming line sections of power distribution systems, lines and substations. The valve type lightning arrester and the zinc oxide lightning arrester are used for protecting a substation and a power plant, are mainly used for limiting atmospheric overvoltage in a system of 500KV and below, and are also used for limiting internal overvoltage or performing backup protection on the internal overvoltage in an ultrahigh voltage system.
The existing multi-chamber lightning arrester has the following defects: 1. the chopper easily threatens the safety of the winding equipment. 2. The operating characteristics of the gap are greatly affected by environmental factors such as air humidity and air pressure. 3. Two phases operating simultaneously will produce an interphase short circuit. The existing zinc oxide lightning arrester has the following defects: 1. the through-flow capacity is small. 2. The zinc oxide resistor disc is aged quickly due to leakage current, and the aging vicious circle caused by uneven potential distribution is easily caused by the characteristic parameter difference of the series resistor disc, so that the lightning arrester is damaged finally. 3. The aging aggravation of the zinc oxide resistance card is avoided when the over-voltage of the energy infinite type is deeply inhibited.
Disclosure of Invention
The invention aims to solve the technical problem and provide a multi-chamber vacuum arrester with serially connected resistor discs.
In order to solve the technical problems, the invention adopts the technical scheme that: a series resistance card multi-chamber vacuum arrester comprises an arrester shell, an insulating inner core, an electrode group and a zinc oxide resistance card, wherein a plurality of insulating umbrella skirts are uniformly sleeved outside the arrester shell from top to bottom, the insulating inner core is arranged inside the arrester shell, a cylindrical vacuum cavity is arranged inside the insulating inner core along the center of the insulating inner core, the electrode group and the zinc oxide resistance card are both arranged in the vacuum cavity, the electrode group comprises an upper electrode, a lower electrode and a middle electrode group, the middle electrode group is arranged between the upper electrode and the lower electrode, the middle electrode group comprises a plurality of middle electrodes which are arranged from top to bottom at intervals, the upper electrode and the lower electrode are both in a conical structure, the upper electrode and the lower electrode are respectively arranged at the upper end and the lower end of the vacuum cavity, and the top electrode and the bottom electrode are arranged oppositely, and mutually isolated vacuum arc extinguishing gaps are formed between the top electrode and the adjacent middle electrode, between the bottom electrode and the adjacent middle electrode and between the two adjacent middle electrodes.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: and the outer wall of the insulating inner core and the inner wall of the lightning arrester shell are provided with threads matched with each other.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the volumes of the plurality of vacuum arc extinguishing gaps are the same.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the insulating inner core is made of epoxy resin or rubber.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the insulating inner core is internally provided with reinforcing ribs which are distributed around the electrode group.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the middle electrode group comprises a plurality of sub-electrodes, and the upper end face and the lower end face of each sub-electrode are conical faces.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the zinc oxide resistance card is arranged at the lower end of the vacuum cavity, and the upper end of the zinc oxide resistance card is attached to the plane end of the lower electrode.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the middle electrode is divided into a mother electrode and a child electrode, the mother electrode is in a conical structure, the upper end face and the lower end face of the child electrode are conical surfaces, and the middle electrode group comprises two mother electrodes and a plurality of child electrodes symmetrically arranged on the upper side and the lower side of the two mother electrodes.
The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: a gap is formed between the two female electrodes, the zinc oxide resistance chip is embedded in the gap between the two female electrodes, and the upper end face and the lower end face of the zinc oxide resistance chip are respectively attached to the two female electrodes.
The multi-chamber vacuum arrester has the following beneficial effects:
compare in current multi-chamber arrester, this structure arrester has following 3 big advantages:
1. and no chopping exists, so that the threat to the safety of winding equipment is avoided.
2. The action characteristic of the gap is not influenced by environmental factors such as air humidity and air pressure;
3. the two phases act simultaneously, so that interphase short circuit cannot be generated;
compared with the common zinc oxide lightning arrester:
this structure arrester has following 3 big advantages:
1. the through-flow capacity is large;
2. the resistor has no leakage current, delays the aging of the zinc oxide resistor disc, and avoids the damage caused by aging vicious circle due to the uneven potential distribution caused by the characteristic parameter difference of the series resistor disc.
3. The aging aggravation of the zinc oxide resistance card is avoided when the over-voltage of the energy infinite type is deeply inhibited.
Drawings
Fig. 1 is a schematic view of the external structure of a multi-chamber vacuum arrester according to the present invention;
fig. 2 is a schematic view of an external structure of the multi-chamber vacuum arrestor in example 1;
fig. 3 is a schematic view showing an external structure of a multi-chamber vacuum arrestor in example 2;
the labels in the figure are: 1. the lightning arrester comprises a lightning arrester shell, 2, an insulating inner core, 3, a zinc oxide resistance card, 4, a vacuum cavity, 5, an upper electrode, 6, a lower electrode, 7, a middle electrode, 8, a vacuum arc extinguishing gap, 9, a conducting rod, 10, an insulating umbrella skirt, 7-1, a female electrode, 7-2 and a sub-electrode.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1 and 2: a series resistance card multi-chamber vacuum arrester comprises an arrester shell 1, an insulating inner core 2, an electrode group and a zinc oxide resistance card 3, wherein a plurality of insulating umbrella skirts 10 are uniformly sleeved outside the arrester shell 1 from top to bottom, the insulating inner core 2 is arranged inside the arrester shell 1, and the insulating inner core 2 is made of epoxy resin or rubber. The outer wall of the insulating inner core 2 and the inner wall of the arrester shell 1 are provided with mutually matched threads, and the insulating inner core 2 and the arrester shell 1 are screwed together.
The insulating inner core 2 is internally provided with a cylindrical vacuum cavity 4 along the center thereof, an electrode group and a zinc oxide resistance card 3 are arranged in the vacuum cavity 4, the electrode group comprises an upper electrode 5, a lower electrode 6 and a middle electrode group, the middle electrode group is arranged between the upper electrode 5 and the lower electrode 6, the middle electrode group comprises a plurality of middle electrodes 7 which are arranged from top to bottom at intervals, the upper electrode 5 and the lower electrode 6 are in a conical structure, the upper electrode 5 and the lower electrode 6 are respectively arranged at the upper end and the lower end of the vacuum cavity 4, the pointed ends of the upper electrode 5 and the lower electrode 6 are oppositely arranged, mutually isolated vacuum arc extinguishing gaps 8 are formed between the upper electrode 5 and the adjacent middle electrode 7, between the lower electrode 6 and the adjacent middle electrode 7 and between the adjacent two middle electrodes 7, the volume of each vacuum arc extinguishing gap 8 is the same, and the upper end face and the lower end face, the zinc oxide resistance chip 3 is arranged at the lower end of the vacuum cavity 4, and the upper end of the zinc oxide resistance chip 3 is attached to the plane end of the lower electrode 6. The upper end of the upper electrode 5 and the lower end of the zinc oxide resistance chip 3 are respectively connected with a conductive rod 9, and the conductive rod 9 extends out of the insulating inner core 2.
The reinforcing ribs are arranged inside the insulating inner core 2 and distributed around the electrode group, and the reinforcing ribs are used for enhancing the stability and rigidity of the insulating inner core 2 and preventing the conical electrode from inclining inside the lightning arrester.
Example 2
As shown in fig. 1 and 3: a series resistance card multi-chamber vacuum arrester comprises an arrester shell 1, an insulating inner core 2, an electrode group and a zinc oxide resistance card 3, wherein a plurality of insulating umbrella skirts are uniformly sleeved outside the arrester shell 1 from top to bottom, the insulating inner core 2 is arranged inside the arrester shell 1, and the insulating inner core 2 is made of epoxy resin or rubber. The outer wall of the insulating inner core 2 and the inner wall of the arrester shell 1 are provided with mutually matched threads, and the insulating inner core 2 and the arrester shell 1 are screwed together.
The insulating inner core 2 is internally provided with a cylindrical vacuum cavity 4 along the center thereof, an electrode group and a zinc oxide resistor disc 3 are arranged in the vacuum cavity 4, the electrode group comprises an upper electrode 5, a lower electrode 6 and a middle electrode group, the middle electrode group is arranged between the upper electrode 5 and the lower electrode 6, the middle electrode group comprises a plurality of middle electrodes 7 which are arranged from top to bottom at intervals, the upper electrode 5 and the lower electrode 6 are both in a conical structure, the upper electrode 5 and the lower electrode 6 are respectively arranged at the upper end and the lower end of the vacuum cavity 4, the pointed ends of the upper electrode 5 and the lower electrode 6 are oppositely arranged, mutually isolated vacuum arc extinguishing gaps 8 are formed between the upper electrode 5 and the adjacent middle electrode 7, between the lower electrode 6 and the adjacent middle electrode 7 and between the adjacent two middle electrodes 7, and the volume of each vacuum arc extinguishing gap 8 is the,
the middle electrode 7 is divided into a mother electrode 7-1 and a sub-electrode 7-2, the mother electrode 7-1 is in a conical structure, the upper end face and the lower end face of the sub-electrode 7-2 are conical surfaces, and the middle electrode group comprises two mother electrodes 7-1 and a plurality of sub-electrodes 7-2 which are symmetrically arranged on the upper side and the lower side of the two mother electrodes 7-1. A gap is arranged between the two mother electrodes, the zinc oxide resistance chip 3 is embedded in the gap between the two mother electrodes 7-1, and the upper end face and the lower end face of the zinc oxide resistance chip 3 are respectively attached to the two mother electrodes 7-1. The upper end of the upper electrode 5 and the lower end of the lower electrode 6 are respectively connected with a conducting rod 9, and the conducting rod 9 extends out of the insulating inner core 2.
The working principle of the vacuum arrester of the invention is as follows: when the tower pole or the lightning conductor is struck by lightning, the high voltage caused by lightning current enables the series gap to be punctured and discharged, the potential difference between the cross arm and the conductor is reduced, and the insulator is guaranteed not to flashover any more, so that the power failure caused by tripping of the circuit is avoided, after the series gap acts, the residual voltage of the zinc oxide resistor is limited to be far lower than the flashover voltage of the insulator, and under the power frequency voltage of a system after the lightning voltage passes, due to the current limiting effect of the resistor and the extremely strong arc extinguishing capability of the vacuum gap, the power frequency follow current can be extinguished at the first zero crossing point after the lightning current passes, and the normal power supply is guaranteed.
Because the arc extinguishing space is vacuum, make easier arc extinguishing on the one hand, on the other hand can let the zinc oxide resistance card be difficult to wet, prolongs the life of zinc oxide resistance card, and ordinary arrester zinc oxide resistance card because sealed not enough, easily wets, arouses leakage current, causes ageing, shortens life. Also, when the lightning arrester is operated (when lightning discharge occurs), a very high temperature is not generated. If the gas is heated, the expansion is exploded, but the vacuum gap is not expanded, and even if the temperature is increased, the expansion is not generated, and the internal pressure is not changed.
The lightning arrester comprises a plurality of vacuum arc extinguishing gaps which are connected in series, so that the energy of an electric arc is dispersed, one gap can bear too much energy, a plurality of gaps split the energy, the energy is low, the temperature rise is also low, and the arc extinguishing is easier to realize.
The electrodes of the lightning arrester are provided with conical surfaces, the conical electrodes are made of metal materials, under the action of lightning, charge aggregation is generated at the tips, a strong electric field is generated, discharge is easily excited under the action of the strong electric field, an uneven electric field exists among the conical electrodes, the flat electrodes are not easily discharged, and the tips of the conical electrodes are easily discharged. A conductive path is formed between the conical electrodes, so that the arc starting is more stable, the divergence is small, the electric field of the flat electrode is uniform, the arc starting voltage is unstable, the divergence is large, and the discharge can be realized between the conical electrodes at about 100 v. The unique electrode structure has a conical gap, so that the arcing is more stable, the gap is connected with the zinc oxide resistance sheet (valve sheet) in series, no current passes through the gap (leakage current cannot be generated) at ordinary times, the valve sheet is protected, and the service life of the valve sheet is prolonged.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. The utility model provides a series resistance card multi-chamber vacuum arrester which characterized in that: the lightning arrester comprises a lightning arrester shell (1), an insulating inner core (2), an electrode group and a zinc oxide resistance card (3), wherein a plurality of insulating umbrella skirts (10) are uniformly sleeved outside the lightning arrester shell (1) from top to bottom, the insulating inner core (2) is arranged inside the lightning arrester shell (1), a cylindrical vacuum cavity (4) is arranged inside the insulating inner core (2) along the center of the insulating inner core, the electrode group and the zinc oxide resistance card (3) are arranged in the vacuum cavity (4), the electrode group comprises an upper electrode (5), a lower electrode (6) and a middle electrode group, the middle electrode group is arranged between the upper electrode (5) and the lower electrode (6), the middle electrode group comprises a plurality of middle electrodes (7) which are arranged at intervals from top to bottom, the upper electrode (5) and the lower electrode (6) are of a conical structure, and the upper electrode (5) and the lower electrode (6) are respectively arranged at the upper end and, and the pointed ends of the upper electrode (5) and the lower electrode (6) are oppositely arranged, and vacuum arc extinguishing gaps (8) which are mutually isolated are formed between the upper electrode (5) and the adjacent middle electrode (7), between the lower electrode (6) and the adjacent middle electrode (7) and between the two adjacent middle electrodes (7).
2. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: and the outer wall of the insulating inner core (2) and the inner wall of the arrester shell (1) are provided with threads matched with each other.
3. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the volumes of the vacuum arc extinguishing gaps (8) are the same.
4. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the insulating inner core (2) is made of epoxy resin or rubber.
5. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the insulating inner core (2) is internally provided with reinforcing ribs which are distributed around the electrode group.
6. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the upper end surface and the lower end surface of the middle electrode (7) are conical surfaces.
7. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 6, wherein: the zinc oxide resistance card (3) is arranged at the lower end of the vacuum cavity (4), and the upper end of the zinc oxide resistance card (3) is attached to the plane end of the lower electrode (6).
8. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the middle electrode (7) is divided into a mother electrode (7-1) and a sub-electrode (7-2), the mother electrode (7-1) is in a conical structure, the upper end face and the lower end face of the sub-electrode (7-2) are conical surfaces, and the middle electrode group comprises two mother electrodes (7-1) and a plurality of sub-electrodes (7-2) symmetrically arranged on the upper side and the lower side of the two mother electrodes (7-1).
9. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 8, wherein: a gap is arranged between the two mother electrodes, the zinc oxide resistance chip (3) is embedded in the gap between the two mother electrodes (7-1), and the upper end face and the lower end face of the zinc oxide resistance chip (3) are respectively attached to the two mother electrodes (7-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356860.4A CN111431034A (en) | 2020-04-29 | 2020-04-29 | Multi-chamber vacuum arrester with series resistor discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356860.4A CN111431034A (en) | 2020-04-29 | 2020-04-29 | Multi-chamber vacuum arrester with series resistor discs |
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| Publication Number | Publication Date |
|---|---|
| CN111431034A true CN111431034A (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010356860.4A Pending CN111431034A (en) | 2020-04-29 | 2020-04-29 | Multi-chamber vacuum arrester with series resistor discs |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242360A (en) * | 2021-12-17 | 2022-03-25 | 宁波市镇海国创高压电器有限公司 | Lightning arrester with isolating switch |
| CN116052970A (en) * | 2022-12-30 | 2023-05-02 | 湖南防灾科技有限公司 | Lightning arrester |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247368A (en) * | 1999-09-08 | 2000-03-15 | 南京跃华电子电气公司 | Metal oxide arrester with non-linear internal gap |
| CN101697399A (en) * | 2009-10-21 | 2010-04-21 | 西安安捷迅电气有限公司 | Gap type lightning protector with releasing device |
| CN107481821A (en) * | 2017-07-21 | 2017-12-15 | 国网湖南省电力公司 | A kind of anti-thunder insulator |
| CN211700926U (en) * | 2020-04-29 | 2020-10-16 | 河南四达电力设备股份有限公司 | Multi-chamber vacuum arrester with series resistor discs |
-
2020
- 2020-04-29 CN CN202010356860.4A patent/CN111431034A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247368A (en) * | 1999-09-08 | 2000-03-15 | 南京跃华电子电气公司 | Metal oxide arrester with non-linear internal gap |
| CN101697399A (en) * | 2009-10-21 | 2010-04-21 | 西安安捷迅电气有限公司 | Gap type lightning protector with releasing device |
| CN107481821A (en) * | 2017-07-21 | 2017-12-15 | 国网湖南省电力公司 | A kind of anti-thunder insulator |
| CN211700926U (en) * | 2020-04-29 | 2020-10-16 | 河南四达电力设备股份有限公司 | Multi-chamber vacuum arrester with series resistor discs |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242360A (en) * | 2021-12-17 | 2022-03-25 | 宁波市镇海国创高压电器有限公司 | Lightning arrester with isolating switch |
| CN114242360B (en) * | 2021-12-17 | 2024-01-19 | 宁波市镇海国创高压电器有限公司 | Lightning arrester with isolating switch |
| CN116052970A (en) * | 2022-12-30 | 2023-05-02 | 湖南防灾科技有限公司 | Lightning arrester |
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Application publication date: 20200717 |
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