CN213636612U

CN213636612U - Lightning arrester

Info

Publication number: CN213636612U
Application number: CN202023091648.4U
Authority: CN
Inventors: 陈锡阳
Original assignee: Shenzhen Dailu Technology Co ltd
Current assignee: Shenzhen Dailu Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-07-06
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a lightning arrester, including the insulating tube, both ends are sealed with the electrically conductive head, fill quartz sand in the insulating tube, quartz sand parcel striking arc line electric connection both ends the electrically conductive head, lightning arrester one end is through connecting piece fixed connection in earthing terminal or electrified end, and the other end constitutes discharge gap with electrified end or earthing terminal, discharge gap is less than insulator air gap, and when thunder and lightning overvoltage broke down discharge gap, striking arc line fusing arouses electric arc to release thunder and lightning, electric arc receives quartz sand suppression extinguishment, avoids the circuit tripping operation; compared with the prior art, the lightning arrester has the advantages of small cross section, light weight, manufacture and assembly of the length according to the requirements of an installation site, and the overall cost is greatly reduced, so that the lightning arrester can be installed on an overhead transmission line in a large area or even in a full-coverage manner, the lightning arrester greatly reduces the lightning trip-out rate, and has technical and economic feasibility and practicability.

Description

Lightning arrester

Technical Field

The utility model relates to a transmission tower lightning protection technical field, concretely relates to arrester.

Background

Most of the transmission lines in the power system are overhead lines, and are easy to be tripped by lightning. According to statistics, the tripping caused by lightning stroke accounts for about 80% of all tripping times, great difficulty is brought to the peak-meeting summer power conservation work, and serious loss is caused to national economy.

At present, the power transmission line generally adopts a lightning conductor and grounding lightning protection, so that shielding lightning is difficult to defend, lightning with larger lightning protection amplitude requires smaller grounding resistance, and the construction and maintenance cost of a grounding network is higher. The lightning arrester can let the thunder and lightning flow let out and put into ground, avoids the power frequency current to last the short circuit and arouses the tripping operation. The length of the transmission line is usually dozens of kilometers, even hundreds of kilometers, but because the protection range of the lightning arrester is only about 300 meters, the lightning arrester needs to be installed on the whole line tower to avoid the lightning stroke tripping of the transmission line. The zinc oxide arrester has higher requirements on manufacturing process, high manufacturing cost, heavy whole body, difficult transportation and installation, easy damage and even explosion, periodic test is needed in the using process, and the operation and maintenance cost is too high, so that the zinc oxide arrester cannot be popularized on a large area of a power transmission line.

The lightning protection device adopting gas production and arc extinction is installed on the tower, so that low-cost lightning protection can be realized, but huge impact force can be generated by explosive type sprayed high-pressure gas, the requirements on the structural strength of the lightning arrester body and the installation support are high, and the arc extinction difficulty of a line with high voltage level is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provides a manufacturing, installation and maintenance low cost, and safe and reliable can realize reducing transmission line's thunderbolt trip-out rate by a wide margin at the arrester that transmission line large tracts of land used.

The technical scheme of the utility model as follows: including the insulating tube, both ends are sealed with the electrically conductive head, fill quartz sand in the insulating tube, quartz sand parcel striking arc line electric connection both ends electrically conductive head, arrester one end is through connecting piece fixed connection in the earthing terminal or the electrified end of shaft tower, and the other end constitutes discharge gap with electrified end or earthing terminal, discharge gap is less than the air gap of insulator, punctures when thunder and lightning overvoltage during discharge gap, striking arc line fusing initiation electric arc discharge thunder and lightning, the electric arc receives quartz sand restraines and extinguishes, avoids the circuit tripping operation.

Compared with the prior art, the beneficial effects of the utility model reside in that: through installing on circuit ground connection end or electrified end framework the utility model discloses an arrester, when this department circuit suffered the thunderbolt, because discharge gap is less than insulator air gap, thunder and lightning overvoltage selects to puncture discharge gap, make insulator chain avoid being punctured electric arc ablation damage, striking wire fusing generates electric arc and releases the thunder and lightning, this electric arc receives quartz sand to restrain control arc current, improve arc voltage, power frequency electric arc is extinguished in 10 milliseconds after lightning current releases, avoid the circuit tripping operation, striking wire fusing back arrester becomes the insulator, discharge gap is greater than insulator air gap after concatenating arrester insulation length, the arrester is accomplished and is once breaks away from automatically after the lightning protection. Although lightning trip-out generally accounts for about 80% of the trip-out of the transmission line, the probability of the trip-out caused by the lightning stroke every year is one thousandth to one hundredth of the trip-out caused by the lightning stroke to each line hanging point of each base tower, and the repeated lightning stroke of one lightning arrester is a rare event. The utility model discloses a lightning arrester disposable makes and installation cost and is less than the zinc oxide lightning arrester far away, can realize the full coverage installation to transmission line from the economy to the realization reduces thunderbolt tripping operation rate by a wide margin, realizes the zero tripping operation of thunderbolt even. Compared with a gas production lightning arrester, the utility model has stronger arc extinguishing capability, is an arc extinguishing technology with high breaking capability, and can completely meet the matching requirement of the existing power grid for extinguishing power frequency short-circuit current of 50-100 kA; the utility model discloses a can not produce the impact force during arrester arc extinguishing, avoid producing the gas arrester and exist the product gas under great short-circuit current and too much cause the risk of explosion and impact, and to the voltage class more than 110kV, produce tracheal length and reach more than one meter, the impact force that the air current of supersonic speed injection produced provides higher requirement to mounting structure, exists harm risk to near equipment and personnel.

Preferably, the arc-leading line comprises one or an alloy of copper, silver, gold, iron and aluminum, or graphene.

Preferably, the insulating tube is an epoxy resin glass fiber tube or a ceramic tube.

Preferably, the conductive end enclosure forming one end of the discharge gap is further connected with an electrode through a fuse, when the discharge gap is broken down by lightning overvoltage, the fuse is fused, and the electrode is separated from the lightning arrester.

Preferably, the periphery of the fuse wire comprises a tube cavity connected with the end part of the insulating tube, the inner wall of the tube cavity comprises gas production materials, when the fuse wire is fused to generate electric arc high temperature, the gas production materials produce gas, and the electrode is impacted by high-pressure gas and separated from the lightning arrester.

Preferably, the electrode extends a preset length along the swinging circumferential direction of the conducting wire at the electrified end, and the length of the discharge gap is kept in a preset interval when the conducting wire at the electrified end swings.

Preferably, the connecting piece includes first clamp splice and second clamp splice, through bolt-up form one with earthing terminal or electrified end framework shaped steel cross-section assorted centre gripping space, a movable clamp splice is connected to first clamp splice, the movable clamp splice includes mutually perpendicular first connecting block and second connecting block, first connecting block with first clamp splice through long screw hole and bolt adjustable connection, set up a plurality of groups of screw holes on the second connecting block, arrester one end is selected a set of screw hole to be connected on the second connecting block through U type bolt, realizes the arrester installation satisfies discharge gap's requirement.

Preferably, the discharge gap is equal to 70-90% of the lightning protection voltage gap of the line charged body.

Preferably, the plurality of lightning arresters are axially connected through the conductive end socket or form the discharge gap to form a series lightning arrester.

Preferably, the middle part of the insulating tube is connected to the grounding terminal framework through an insulating pull wire.

Drawings

Fig. 1 is a cross-sectional view of one embodiment of a lightning arrester of the present invention;

fig. 2 is a schematic view of an installation structure of a first embodiment of the present invention;

FIG. 3 is a schematic view of an assembly of a connector according to an embodiment of the present invention;

FIG. 4 is a schematic view of a two-segment connection according to an embodiment of the present invention;

fig. 5 is a schematic view of a third mounting structure according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example one

Referring to fig. 1 to 3, the present embodiment provides a lightning arrester 1, including an insulating tube 31, two ends of which are sealed by conductive end sockets 34, the insulating tube 31 is filled with quartz sand 32, the quartz sand 32 wraps an arc lead line 33 electrically connected to the conductive end sockets 34 at the two ends, one end of the lightning arrester 1 is fixedly connected to a ground end framework 8 of a tower through a connecting piece 7, and the other end of the lightning arrester forms a discharge gap 3 with a line live-carrying body 4, where the line live-carrying body 4 may be a wire or an electrode (not shown) attached to the wire, the discharge gap 3 is smaller than an air gap 5 of an insulator 6, when a lightning overvoltage breaks through the discharge gap 3, the arc lead line 33 is fused to cause an arc to release a lightning, and the arc is suppressed by the quartz sand. The arc leading line 33 is formed by adding an anti-corrosion surface layer to a copper wire or a copper wire, the diameter is 0.1-0.3 mm, and under the condition that the manufacturing process is satisfied, the number of metal ions can be reduced by adopting a thinner wire diameter, so that arc extinguishing is facilitated. The arc leading line 33 can also be made of graphene, and insulating carbon dioxide gas is generated under the action of electric arc, so that the insulating property is improved. The insulating tube 31 is an epoxy resin glass fiber tube with the inner diameter of 20-30 mm and the wall thickness of 2-10 mm according to application occasions, the arc extinguishing effect caused by filling quartz sand is considered according to the inner diameter, and factors such as the pressure in the tube and the wind resistance stress strength of the insulating tube when an electric arc is generated are considered according to the wall thickness. The diameter of the quartz sand 32 is 0.1-0.5 mm, and the quartz sand 32 with the uniform diameter of 0.2-0.3 mm is preferably densely filled. The conductive end cap 34 forming one end of the discharge gap 3 is further connected to an electrode 2 via a fuse 37, and when the discharge gap 3 is broken down by lightning overvoltage, the fuse 37 is blown out and the electrode 2 is separated from the lightning arrester 1. The electrode 2 comprises a fuse 37 and a tube cavity 38 on the peripheral side of the fuse 37 is connected with the end part of the insulating tube 31, the inner wall of the tube cavity 38 comprises a polymer gas production material such as nylon, when the fuse 37 is fused to generate electric arc high temperature to enable the gas production material to produce gas, and the electrode 2 is impacted by high-pressure gas to be separated from the lightning arrester 1. The electrode 2 further comprises a transverse electrode body 39, the transverse electrode body 39 extends along the swinging circumferential direction of the line charged body 4, the length of the transverse electrode body is 200-300 mm, and the length of the discharge gap 3 is kept in a preset interval when the line charged body 4 swings. The discharge gap 3 is equal to 70-90%, preferably 80% of the lightning protection voltage gap of the line charged body 4, and for a 110kV line, the discharge gap 3 is 850mm long.

The connecting piece 7 comprises a first clamping block 11 and a second clamping block 10, a clamping space matched with the section of 8-shaped steel of a grounding end or a live end framework is formed by fastening through a bolt 16, the first clamping block 11 is connected with a movable clamping block, the movable clamping block comprises a first connecting block 12 and a second connecting block 13 which are perpendicular to each other, the first connecting block 12 and the first clamping block 11 are connected in an adjustable mode through a long screw hole and a bolt, a plurality of groups of screw holes 14 are formed in the second connecting block 13, one end of the lightning arrester 1 is connected to the second connecting block 13 through one group of screw holes 14 of a U-shaped bolt 15, and the lightning arrester 1 is installed to meet the requirement of a discharge gap 3. For voltage class above 220kV, the length of the lightning arrester 1 is longer, usually greater than 2 meters, and preferably, the middle part of the insulating tube 31 is connected to the grounding terminal framework 8 through the insulating pull wire 9, so as to improve the installation stability of the lightning arrester.

Example two

As shown in fig. 4, the difference between this embodiment and the first embodiment is that in this embodiment, the length of the lightning arrester 3 is long, and for the convenience of transportation and installation, the lightning arrester 3 can be manufactured and transported in segments, and when being installed, the lightning arrester 21 and the lightning arrester 22 are axially connected through the conductive end socket 23 and the conductive end socket 24 to form a series lightning arrester. The arrester 21 and the arrester 22 are connected in series, and the principle of the series arrester of the present embodiment is the same as that of the above-described embodiment, and therefore, will not be described again.

EXAMPLE III

As shown in fig. 5, the present embodiment is the same as the second embodiment in that the length of the lightning arrester 3 is long, and the lightning arrester 3 can be manufactured and transported in segments for transportation and installation convenience, except that the lightning arrester 21 and the lightning arrester 22 are respectively installed on the grounding terminal 8 and the live terminal 4 through the connecting member 7 during installation, the respective terminals of the lightning arrester 21 and the lightning arrester 22 form the discharge gap 3, and the lightning arrester 21 and the lightning arrester 22 are connected through the discharge gap 3 to form the series lightning arrester. The discharge gap 3 is smaller than the air gap 5 of the insulator 6, when the lightning overvoltage breaks down the discharge gap 3, the arc leading lines 33 in the lightning arrester 21 and the lightning arrester 22 are fused to trigger the arc to discharge lightning, the arc is suppressed by the quartz sand 32 to be extinguished, and the line is prevented from tripping. This embodiment can be convenient for with the integrative installation of insulator, saves connection structure cost, can keep 3 length stabilization invariants in discharge gap when the wire wind pendulum.

It can be seen from the above embodiment, the utility model discloses an it is little that the arrester compares prior art has the cross-section, light in weight, length can be made and the equipment according to the needs of erection site, can not produce the high-speed gas impact force when the thunderbolt moves, the utility model discloses an arrester has concatenated discharge gap, and it does not have the electric current to pass through at the operating condition striking line, and the load current factor can not be considered in the cross-section of striking line, and the cross-section is little, and arc extinguishing ability is stronger, and link overall cost such as making, transportation, installation, operation reduces by a wide margin to make the arrester can install on overhead transmission line by large tracts of land cover even, realize reducing by a wide margin thunderbolt trip-out rate, so that finally realize that transmission equipment thunderbolt "zero trip-out.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An arrester, characterized in that: including the insulating tube, both ends are sealed with electrically conductive head, fill quartz sand in the insulating tube, quartz sand parcel draws pitch arc electric connection both ends electrically conductive head, arrester one end is through connecting piece fixed connection in the earthing terminal or the electrified end of shaft tower, the other end with electrified end or the earthing terminal constitutes the discharge gap, the discharge gap is less than the air gap of insulator, punctures when thunder and lightning overvoltage during the discharge gap, the striking line fusing triggers electric arc and releases the thunder and lightning, electric arc receives quartz sand restraines and extinguishes, avoids the circuit tripping operation.

2. A surge arrester according to claim 1, characterized in that: the arc-leading line comprises one of copper, silver, gold, iron and aluminum or an alloy, or is composed of graphene.

3. A surge arrester according to claim 1, characterized in that: the insulating tube is an epoxy resin glass fiber tube or a ceramic tube.

4. A surge arrester according to claim 1, characterized in that: the conductive end socket which forms one end of the discharge gap is also connected with an electrode through a fuse wire, when the discharge gap is broken down by lightning overvoltage, the fuse wire is fused, and the electrode is separated from the lightning arrester.

5. A surge arrester according to claim 4, characterized in that: the periphery of the fuse wire comprises a pipe cavity connected with the end part of the insulating pipe, the inner wall of the pipe cavity comprises gas production materials, when the fuse wire is fused to generate electric arc high temperature, the gas production materials produce gas, and the electrode is impacted by high-pressure gas to be separated from the lightning arrester.

6. An arrester according to claim 5, characterized in that: the electrode extends for a preset length along the circumferential direction of the swinging of the conducting wire at the electrified end, and the length of the discharge gap is kept in a preset interval when the conducting wire at the electrified end swings.

7. A surge arrester according to claim 1, characterized in that: the connecting piece includes first clamp splice and second clamp splice, through the bolt-up form one with earthing terminal or electrified end framework shaped steel cross-section assorted centre gripping space, a movable clamp splice is connected to first clamp splice, the movable clamp splice includes mutually vertically first connecting block and second connecting block, first connecting block with first clamp splice is connected through long screw and bolt are adjustable, set up a plurality of groups of screw on the second connecting block, arrester one end is selected a set of screw through U type bolt and is connected on the second connecting block, realizes the arrester installation satisfies the clearance requirement of discharging.

8. A surge arrester according to claim 1, characterized in that: the discharge gap is equal to 70-90% of the insulator air gap.

9. A surge arrester according to claim 1, characterized in that: and the plurality of lightning arresters are axially connected through the conductive end sockets to form series-connected lightning arresters.

10. A surge arrester according to claim 1, characterized in that: the middle part of the insulating tube is connected to the grounding end framework through an insulating pull wire.