CN113096899A - Lightning protection insulator with multi-column cake-shaped resistor discs connected in parallel - Google Patents
Lightning protection insulator with multi-column cake-shaped resistor discs connected in parallel Download PDFInfo
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- CN113096899A CN113096899A CN202110333177.3A CN202110333177A CN113096899A CN 113096899 A CN113096899 A CN 113096899A CN 202110333177 A CN202110333177 A CN 202110333177A CN 113096899 A CN113096899 A CN 113096899A
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- lightning protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/46—Means for providing an external arc-discharge path
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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
- H01C7/123—Arrangements for improving potential distribution
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Abstract
The utility model relates to the technical field of electrical engineering, in particular to a lightning protection insulator with multiple parallel-connected pie-shaped resistor discs, which comprises an insulating column, an epoxy core rod and a parallel resistor, wherein the epoxy core rod is embedded in the insulating column, and two ends of the epoxy core rod extend out of the insulating column, so that the lightning protection insulator has the capacity of bearing the tension of a lead; the parallel resistor comprises at least two parallel voltage-sensitive resistor rods, and the at least two voltage-sensitive resistor rods are embedded in the insulating column and surround the epoxy core rod at intervals. The parallel resistor is in a high-resistance state under normal power frequency voltage, the resistance value is rapidly reduced during lightning action, lightning is released along the parallel resistor, the resistance value is recovered after lightning stroke, and power frequency current is extinguished.
Description
Technical Field
The utility model relates to an electrical engineering technical field especially relates to a parallelly connected lightning protection insulator of many cylindric cake shape resistance card.
Background
In recent years, global natural disasters frequently occur, and power transmission lines are frequently subjected to lightning strikes to cause tripping and power failure accidents. With the rapid development of electric power construction, the areas covered by the power grid are wider and wider, the power transmission line is often required to be erected in mountainous areas with complex terrains, and the areas often have climatic phenomena of easy icing in cold winter and frequent lightning in spring and summer. In the areas with special geographic environments, when severe weather occurs, flashover tripping and power failure accidents caused by lightning strike of the power transmission line are easy to happen, and the safe and stable operation of a large power grid is seriously threatened.
In the traditional lightning protection technology, an overhead lightning conductor and a lightning arrester are generally adopted for lightning protection. The overhead ground wire is arranged on a line, and due to the existence of a protection failure angle, the phenomenon of circuit shielding failure under power transmission still exists in special terrain areas such as mountainous areas and the like. Besides overhead ground wires, lightning arresters are also commonly used for lightning protection on power transmission lines (composite-sheathed metal oxide lightning arresters for DL-T815- & lt2016 AC power transmission lines), however, the existing lightning arresters cannot bear the pulling force of wires, and additional external hanging points are required during installation, so that the construction is complex. Meanwhile, the conventional lightning arrester has limited current capacity, and the zinc oxide lightning arrester is damaged by lightning stroke, so that the accident of line tripping and power failure is frequently reported. The lightning-proof core element of the lightning arrester is a zinc oxide resistance card, the area of the zinc oxide resistance card is increased, the through-current capacity can be enhanced, the single-chip large-diameter zinc oxide resistance card is difficult to produce, the electric field of the inner side surface of the annular zinc oxide resistance card is concentrated under the action of impact current, the phenomenon of side flashover occurs, and the through-current capacity is difficult to promote.
In view of the above, it is highly desirable to develop a lightning protection insulator capable of simultaneously bearing the tensile force of the wires and having a high-current lightning protection function.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a lightning protection insulator with parallel multi-pillar pie-shaped resistor discs.
The utility model provides a parallelly connected lightning protection insulator of many cylindric cake shape resistance card, including insulated column, epoxy plug and parallel resistance, the epoxy plug inlays to be located in the insulated column, just the both ends of epoxy plug are followed stretch out in the insulated column for bear the wire pulling force, parallel resistance includes two piece at least parallelly connected varistor stick, two at least varistor stick inlays to be established in the insulated column, and centers on the epoxy plug interval sets up.
Optionally, a pressure release cylinder is sleeved on the piezoresistor rod, and the pressure release cylinder is made of an insulating material.
Optionally, an insulating grease is filled between the pressure release cylinder and the varistor bar.
Optionally, a bursting groove is formed in the pressure release cylinder, and the depth of the bursting groove is smaller than the wall thickness of the pressure release cylinder.
Optionally, the number of the burst grooves is multiple, and the multiple burst grooves are spirally arranged along the axial direction of the pressure release cylinder.
Optionally, the epoxy core rod is arranged along the axis of the insulating column, and a metal sleeve is sleeved on the epoxy core rod.
Optionally, each varistor rod includes a plurality of zinc oxide resistor discs arranged in sequence along an axial direction parallel to the epoxy core rod.
Optionally, at least two varistor rods are distributed in an array around the epoxy core rod.
Optionally, the insulating column is further embedded with two connecting hardware fittings, the connecting hardware fittings are annular, and the two connecting hardware fittings are respectively in contact connection with the two ends of the voltage-sensitive resistance rod and are respectively sleeved on the voltage-sensitive resistance rod.
Optionally, the diameter of the epoxy core rod is Φ, the diameter of the insulating column is D, and the diameter of the varistor rod is D, where D is (D- Φ -20)/2;
and/or the corresponding relation between the diameter phi of the epoxy core rod and the system voltage U meets the following requirements:
compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
1) according to the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel, the epoxy core rod and the parallel resistor are embedded in the insulating column, the epoxy core rod is used for bearing the conductive gravity, the installation mode is the same as that of a common insulator, and construction is simple and convenient.
2) The parallel resistor comprises at least two parallel-connected voltage-sensitive resistor rods, and the at least two voltage-sensitive resistor rods are arranged around the epoxy core rod at intervals. The parallel resistor is in a high-resistance state under normal power frequency voltage, the resistance value is rapidly reduced when lightning acts, the lightning is released along the parallel resistor, the resistance value is recovered after lightning stroke, and power frequency current is extinguished. When the parallel zinc oxide resistor is increased, the through-current capacity of the whole lightning protection insulator is basically increased linearly, the production and the processing are simple and convenient compared with a single large-diameter resistor disc, flashover is not easy to occur on the inner side surface compared with an annular resistor disc, and the lightning protection through-current capacity is greatly increased compared with that of a traditional lightning arrester under the condition of not greatly increasing the cost. By adopting the parallel resistor disclosed by the invention, the absorbing capacity of the lightning energy can be greatly improved.
3) A plurality of explosion-proof groove structures are arranged on the lightning protection insulator epoxy cylinder, when the lightning energy exceeds the tolerance capability of the piezoresistor, the explosion grooves explode to guide electric arcs to the outside of the lightning protection insulator with the multi-column cake-shaped resistor discs connected in parallel, and damage to the epoxy core rod is avoided. .
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a cross section of a lightning protection insulator with multiple cylindrical pie-shaped resistor discs connected in parallel according to an embodiment of the disclosure;
fig. 2 is a schematic view of an internal structure of a lightning protection insulator with multiple cylindrical pie-shaped resistor discs connected in parallel according to an embodiment of the disclosure;
FIG. 3 is a schematic structural diagram of a blast groove according to an embodiment of the present disclosure;
fig. 4 is a graph of the ratio of the total length of the blast groove to the stress that the epoxy core rod can withstand according to an embodiment of the disclosure.
Wherein, 1, an epoxy core rod; 2. a varistor bar; 3. a pressure release cartridge; 4. an insulating column; 5. connecting a hardware fitting; 301. a blasting groove; 401. an umbrella skirt.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
As shown in fig. 1 and fig. 2, the present disclosure provides a lightning protection insulator with multiple parallel-connected cylindrical resistor discs, which includes an insulating column 4, an epoxy core rod 1 and a parallel resistor, wherein the epoxy core rod 1 is embedded in the insulating column 4, two ends of the epoxy core rod 1 extend out of the insulating column 4, the parallel resistor includes at least two parallel-connected varistor rods 2, and the at least two varistor rods 2 are embedded in the insulating column 4 and are arranged around the epoxy core rod 1 at intervals. At least two voltage dependent resistor bars 2 are connected in parallel, and present the high resistance state under normal power frequency voltage, are equivalent to the state of opening a circuit, and under the thunder and lightning effect, the resistance of parallel resistance reduces rapidly, is equivalent to the short circuit state, and the thunder and lightning is released along parallel resistance. When setting up the piezoresistor stick to a plurality of parallelly connected, the current capacity of whole lightning protection insulator is linear increase basically, and production and processing are simple and convenient for single major diameter resistance card, and for annular resistance card, the medial surface is difficult for taking place the flashover, and under the condition of not a large amount of incremental cost, lightning protection current capacity increases than traditional arrester by a wide margin.
When the lightning protection insulator is used, the upper end of the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel is hung on a tower, the lower end of the lightning protection insulator is connected with a lead, and at least two voltage-sensitive resistor rods 2 are connected in parallel under normal working conditions to be in a high-resistance state and keep insulation. Lightning produces the overvoltage on the wire during thunderbolt, and the parallel resistance switches on, and lightning current gets into the shaft tower through piezo-resistor stick 2, prevents that other power equipment are damaged to the lightning overvoltage. After lightning strike, the voltage dependent resistor rod 2 is restored to a high-resistance state, and normal and stable operation of a power grid is guaranteed.
Referring to fig. 3, in some embodiments of the present disclosure, a pressure release cylinder 3 is sleeved on a varistor rod 2, the pressure release cylinder 3 is made of an insulating material, specifically, an epoxy resin material, a bursting groove 301 is disposed on the pressure release cylinder 3, a depth of the bursting groove 301 is smaller than a thickness of the pressure release cylinder 3, the bursting groove 301 is formed from an outer wall of the pressure release cylinder 3 to an inner wall direction, and does not penetrate through the inner wall, so as to form a thin-wall structure, when a lightning energy exceeds a tolerance of the varistor rod 2, the bursting groove 301 bursts, an electric arc is guided to an outside of a lightning protection insulator with multiple cylindrical pie-shaped resistor discs connected in parallel, and damage to the epoxy core rod 1 is avoided.
Further, in some embodiments of the present disclosure, a gap is formed between the pressure release cylinder 3 and the varistor rod 2, and an insulating grease is filled in the gap, where the insulating grease is a silicone-based lubricating product that does not solidify and harden, and is suitable for electronic and electrical components, connectors, joints, and other components, and the product has functions of sealing, protecting, and maintaining the components or components. In the embodiment of the present disclosure, the insulating grease is poured into the gap between the varistor rod 2 and the pressure release cylinder 3, so that the insulation grease has a certain buffering effect between the varistor rod 2 and the pressure release cylinder 3 under the action of thermal expansion and cold contraction of the varistor rod 2.
Further, in some embodiments of the present disclosure, the pressure release cylinder 3 is provided with a plurality of bursting grooves 301, and the plurality of bursting grooves 301 are spirally arranged along the axial direction of the pressure release cylinder 3, that is, two adjacent bursting grooves 301 in the circumferential direction of the pressure release cylinder 3 are staggered, so that the bursting can occur when a specific pressure is reached at each position of the pressure release cylinder 3 in the axial direction.
The insulating column 4 of the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel is formed by vulcanizing silicone rubber, a first mounting hole penetrating through the insulating column is formed in the axis of the insulating column 4, the epoxy core rods 1 penetrate through the first mounting hole and are fixed with the insulating column 4, a plurality of second mounting holes are further formed in the insulating column 4 around the first mounting hole, specifically, in some embodiments of the disclosure, the number of the second mounting holes is 4, the 4 second mounting holes are arranged around the first mounting hole in a rectangular array mode, the distance between each second mounting hole and the first mounting hole is equal, the distance between any two adjacent second mounting holes is also equal, one piezoresistor rod 2 is arranged in each second mounting hole, the piezoresistor rod 2 is arranged in parallel with the epoxy core rods 1, and two ends of the piezoresistor rod 2 are located inside the insulating column 4.
Further, still inlay in the insulating post 4 and be equipped with two link fitting 5, link fitting 5 is the annular, and two link fitting 5 are fixed with the both ends contact of varistor stick 2 respectively, and overlap respectively and establish on epoxy plug 1, and link fitting 5 is used for forming electrical connection, and when the thunder and lightning effect, the lightning current flows on varistor stick 2 along the link fitting of one end, on flowing the link fitting of the other end again, flows on the shaft tower at last, realizes the lightning-arrest effect of wire.
Furthermore, in some embodiments of the present disclosure, each varistor rod 2 includes a plurality of zinc oxide resistor discs arranged in series along an axis parallel to the epoxy core rod 1.
When designing this parallelly connected lightning protection insulator of many cylindric cake shape resistance card, need consider the voltage class of system, according to system voltage class, rationally select the parallelly connected lightning protection insulator's of many cylindric cake shape resistance card size, specifically, the satisfaction of the relation of minimum diameter D of insulated column 4 and system voltage U:
when U is 35kv, D is 125 mm; when U is 110kv, D is 150 mm; when U is 220kv, D is 175 mm; when U is 500kv, D is 220 mm.
The epoxy core rod 1 is used for bearing the gravity of a lead, and the corresponding relation between the diameter phi of the epoxy core rod 1 and the system voltage level meets the following requirements:
that is, when the system voltage is less than 220kv, the diameter Φ of the epoxy core rod 1 is 20mm, and when the system voltage is greater than or equal to 220kv, the diameter Φ of the epoxy core rod 1 is U/10 mm.
Specifically, in actual use, the diameters of the epoxy core rods 1 corresponding to the respective voltage levels are shown in the following table:
| U | 35kV | 110kV | 220kV | 500kV |
| Ф | 20mm | 20mm | 22mm | 50mm |
when the surge current acts on the varistor rods 2, the surge current is mainly distributed on the outer edges of the varistor rods 2 due to the skin effect, the current capacity of the parallel resistor is in direct proportion to the total circumference of the section of the varistor rods 2, and when the number of the varistor rods 2 is 4, the diameter of each varistor rod 2 is D, and D is (D-phi-20)/2.
It follows that the diameter d of the varistor rod 2 for different voltage classes is shown in the following table:
| U | 35kV | 110kV | 220kV | 500kV |
| d | 42.5mm | 55mm | 66.5mm | 75mm |
further, as shown in fig. 4, which is a corresponding relationship diagram between the explosion area ratio and the maximum stress of the epoxy core rod 1, specifically, the stress of the epoxy core rod 1 and the total length ratio of the explosion groove 301 are in a negative exponential relationship, and it is known that the maximum design value of the stress applied to the epoxy core rod 1 is P, and the total length of the explosion groove 301 accounts for 30% to 40% of the length of the lightning protection insulator with the multiple cylindrical cake-shaped resistor discs connected in parallel.
Specifically, in order to ensure the main body strength of the whole lightning protection insulator with the multi-column cake-shaped resistor discs connected in parallel, the thickness of the pressure release cylinder 3 is at least more than 5mm, the thickness of the pressure release cylinder 1 at the position of the blasting groove 301 is 2mm to 3mm, the length of the blasting groove 301 is 6mm to 8mm, the width of the blasting groove 301 is a rectangular groove with the width of 2mm to 3mm, and the distance between the upper and lower adjacent blasting grooves 301 is 10mm to 15 mm.
In addition, the outer wall of the insulating column 4 is sequentially provided with a plurality of circles of umbrella skirts 401 along the axial direction, the umbrella diameters of the three umbrella skirts 401 in the direction from top to bottom are reduced one by one, when rain, snow and freezing weather occurs, the umbrella diameters of the three umbrella skirts 401 of the insulating column 4 are reduced one by one from top to bottom, the large umbrella skirt above plays a good shielding role on the middle and small umbrella skirts below, ice coating bridging among the umbrella skirts is prevented, and the external insulation level of the lightning protection insulator with the multi-column cake-shaped resistor discs connected in parallel can be effectively prevented from descending. Or a large umbrella skirt can be arranged in the middle, and small umbrella skirts can be arranged at two ends.
Traditional arrester can not bear gravity, and the lightning protection insulator that this disclosed embodiment provided sets up the epoxy plug in the middle, and a plurality of varistor stick are parallelly connected and set up around the epoxy plug, and the epoxy plug can be used for bearing the pulling force of wire.
The zinc oxide resistance current capacity among traditional arrester is difficult to promote, and the area preparation of increase zinc oxide resistance is comparatively difficult, and the easy medial surface flashover of zinc oxide resistance, after adopting a plurality of varistor stick to connect in parallel in the embodiment of this disclosure, can increase the current capacity by a wide margin under the prerequisite that does not increase cost.
To sum up, the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel provided by the embodiment of the disclosure can be installed on a tower to support and fix a transmission conductor, and when a line normally runs, the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel plays a role of a common insulator to support and fix the transmission conductor and keep good insulation between the conductor and the ground, so as to bear normal line working voltage; in thunderstorm weather, when the direct-striking overvoltage or the induced overvoltage caused by the direct-striking of a tower or a wire or the lightning strike on the ground near a line is applied to the lightning protection insulator which is connected with the multi-column pie-shaped resistor disc in parallel, the parallel resistor is quickly reduced, the lightning is released along the parallel resistor, the resistance value is recovered after the lightning strike, the power frequency current is extinguished, and the line trip accident is avoided. The trial production of the lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel proves that the lightning protection and anti-icing effects are good.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a parallelly connected lightning protection insulator of many cylindric cake shape resistance card which characterized in that, includes insulated column, epoxy plug and parallel resistance, the epoxy plug inlays to be located in the insulated column, just the both ends of epoxy plug are followed stretch out in the insulated column for bear the wire pulling force, parallel resistance includes two piece at least parallelly connected varistor stick, at least two varistor stick inlays to be established in the insulated column, and centers on the epoxy plug interval sets up.
2. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 1, wherein a pressure release cylinder is sleeved on the piezoresistor rod, and the pressure release cylinder is made of an insulating material.
3. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 2, wherein insulating grease glue is filled between the pressure release cylinder and the varistor rods.
4. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 2, wherein a bursting groove is formed in the pressure release cylinder, and the depth of the bursting groove is smaller than the wall thickness of the pressure release cylinder.
5. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 4, wherein the number of the blasting grooves is multiple, and the plurality of the blasting grooves are spirally arranged along the axial direction of the pressure release cylinder.
6. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 1, wherein the epoxy core rod is arranged along the axis of the insulating column, and a metal sleeve is sleeved on the epoxy core rod.
7. The lightning protection insulator with multiple parallel-connected cylindrical resistor discs as claimed in any one of claims 1 to 6, wherein each varistor rod comprises a plurality of zinc oxide resistor discs connected in series and arranged in sequence along an axial direction parallel to the epoxy core rod.
8. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 7, wherein at least two varistor rods are distributed in an array around the epoxy core rod.
9. The lightning protection insulator with the multi-column pie-shaped resistor discs connected in parallel according to claim 6, wherein two connecting fittings are embedded in the insulating column, the connecting fittings are annular, and the two connecting fittings are respectively in contact connection with two ends of the varistor rod and are respectively sleeved on the epoxy core rod.
10. The lightning protection insulator with the parallel multi-column pie-shaped resistor discs as claimed in claim 1, wherein the diameter of the epoxy core rod is Φ, the diameter of the insulating column is D, and the diameter of the varistor rod is D, wherein D is (D- Φ -20)/2;
and/or the corresponding relation between the diameter phi of the epoxy core rod and the system voltage U meets the following requirements:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333177.3A CN113096899A (en) | 2021-03-29 | 2021-03-29 | Lightning protection insulator with multi-column cake-shaped resistor discs connected in parallel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333177.3A CN113096899A (en) | 2021-03-29 | 2021-03-29 | Lightning protection insulator with multi-column cake-shaped resistor discs connected in parallel |
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| CN113096899A true CN113096899A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110333177.3A Pending CN113096899A (en) | 2021-03-29 | 2021-03-29 | Lightning protection insulator with multi-column cake-shaped resistor discs connected in parallel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585046A (en) * | 2004-05-26 | 2005-02-23 | 宁波市科技园区永耀电力科技发展有限公司 | Composite protective cover insulator lightning arrester and producing method thereof |
| CN103280792A (en) * | 2013-04-24 | 2013-09-04 | 国家电网公司 | Voltage limiter with porcelain housing for series compensation device |
| CN205451959U (en) * | 2016-03-11 | 2016-08-10 | 杭州永德电气有限公司 | High voltage arrester |
| CN108878084A (en) * | 2018-06-25 | 2018-11-23 | 国网湖南省电力有限公司 | Explosion-proof lightning arrester |
-
2021
- 2021-03-29 CN CN202110333177.3A patent/CN113096899A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585046A (en) * | 2004-05-26 | 2005-02-23 | 宁波市科技园区永耀电力科技发展有限公司 | Composite protective cover insulator lightning arrester and producing method thereof |
| CN103280792A (en) * | 2013-04-24 | 2013-09-04 | 国家电网公司 | Voltage limiter with porcelain housing for series compensation device |
| CN205451959U (en) * | 2016-03-11 | 2016-08-10 | 杭州永德电气有限公司 | High voltage arrester |
| CN108878084A (en) * | 2018-06-25 | 2018-11-23 | 国网湖南省电力有限公司 | Explosion-proof lightning arrester |
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Application publication date: 20210709 |
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