CN109887693A - A kind of variable in-line gap composite insulating metal oxide lightning arrester - Google Patents
A kind of variable in-line gap composite insulating metal oxide lightning arrester Download PDFInfo
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- CN109887693A CN109887693A CN201910259664.2A CN201910259664A CN109887693A CN 109887693 A CN109887693 A CN 109887693A CN 201910259664 A CN201910259664 A CN 201910259664A CN 109887693 A CN109887693 A CN 109887693A
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- 238000009413 insulation Methods 0.000 claims abstract description 43
- 239000011787 zinc oxide Substances 0.000 claims abstract description 34
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- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
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- 229960000909 sulfur hexafluoride Drugs 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of variable in-line gap composite insulating metal oxide lightning arresters, including hollow insulation tube (2), the cluster parachute set (3) being coated on hollow insulation tube lateral wall, it is respectively arranged on the first metal end plate (4) and the second metal end plate (5) of hollow insulation tube (2) upper and lower ends, the axial insulating vessel (6) being set in hollow insulation tube (2) and the zinc oxide resistance sheet (8) being stacked from top to bottom, insulating vessel and zinc oxide resistance sheet lateral wall form gap (9) with hollow insulation tube, insulating vessel upper end is connected with the first metal end plate, zinc oxide resistance sheet lower end is set to the second metal end plate；Insulating vessel is telescopic bellows, and chamber is axially arranged with discharging gap structure in the inner.The present invention can avoid INVENTIONConventional metal-oxide arrester and resistor disc voltage ageing easily occur and then causes heat damage and insulation breakdown problem, can also solve the afterflow arcing problems using the arrester of fixed series gap after the disappearance of overvoltage in short-term.
Description
Technical field
The present invention relates to electric system power transmission and transforming equipment over-voltage protection technique fields, and in particular between a kind of variable in-line
Gap composite insulating metal oxide lightning arrester.
Background technique
Arrester is used to protect electrical equipment in electric system from the damage of Lightning Over-voltage or avoids being grasped due to equipment
Make caused internal overvoltage damage, is the important protection equipment for being related to safe and stable operation of power system.With voltage
The raising of grade, Lightning Over-voltage and switching overvoltage problem become to become increasingly conspicuous, and the runnability for improving arrester seems outstanding
It is important.
INVENTIONConventional metal-oxide arrester is generally multiple zinc oxide nonlinear resistance slices in structure and is stacked in two metals
Between electrode, without intermediate space.Its when voltage is normal with high resistance to be in state of insulation, and go out in the system
Now in short-term overvoltage when, dash current through resistor disc enter ground, the pressure drop (residual voltage) of resistor disc itself due to its nonlinear characteristic then
It is maintained within a certain range, so that the Overvoltage Amplitude in equipment in parallel with arrester be made to be limited, electrical equipment is protected
Shield.But the metal oxide arrester of the structure is with the growth of runing time, in long-term running power frequency or DC voltage
And under Lightning Over-voltage, the switching overvoltage of discontinuity act on, resistor disc can gradually appear deterioration and aging phenomenon, cause to hinder
Property electric current rise, active power increases, and long-term fuel factor dramatically increases, and arrester internal gas pressure and temperature gradually increase
Height will cause the heat damage (thermal runaway) of arrester when temperature is more than for a long time a certain limiting value.Even if it is existing not occur heat damage
As, but because of the decreasing insulating of resistor disc, insulation breakdown damage may finally occur under the effect of one-shot voltage, from
And cause tripping or the ground fault of electrical equipment.
In recent years, metal oxide arrester also has connects using setting is fixed between zinc oxide resistance sheet and metal electrode
The structure type in gap avoids the long-term of zinc oxide resistance sheet since series gap keeps state of insulation when operating normally
Charging operation.When the Lightning Over-voltage or switching overvoltage that are more than system permission occur, series gap electrically punctures, and formation is led
Electric arc, dash current enter ground, the pressure limiting characteristic movement of zinc oxide resistance sheet, so that in parallel with arrester is electrical through resistor disc
Equipment is protected.Although the overvoltage phenomenon duration is very short, in the process, since working voltage acts on always string
Join on gap, after having served as loss of voltage, sometimes the electric arc between series gap can not extinguish therewith, and it is existing to form afterflow electric arc
As series gap cannot be restored to state of insulation.At this point, electric arc sustained combustion, cause arrester internal temperature it is gentle be pressed in it is short
It is sharply increased in time, until exploding, seriously affects the safe and stable operation of electric system.
Therefore, needing those skilled in the art, to develop a kind of variable in-line gap composite insulating metal oxide lightning-arrest
Resistor disc voltage ageing easily occurs to avoid INVENTIONConventional metal-oxide arrester and then causes asking for heat damage and insulation breakdown for device
Topic, while the afterflow arcing problems using the arrester of fixed series gap after the disappearance of overvoltage in short-term can also be solved.
Summary of the invention
The purpose of the present invention is to solve above-mentioned the deficiencies in the prior art, provide a kind of variable in-line gap
Composite insulating metal oxide lightning arrester, to avoid INVENTIONConventional metal-oxide arrester that resistor disc voltage ageing easily occurs and then draw
The problem of fever destruction and insulation breakdown, while can also solve to disappear using the arrester of fixed series gap in overvoltage in short-term
Afterflow arcing problems after mistake promote the service life and performance reliability of metal oxide arrester.
In order to achieve the above object of the invention, technical solution provided by the invention is as follows: a kind of variable in-line gap is compound absolutely
Edge metal oxide arrester, the arrester include hollow insulation tube, the cluster parachute set being coated on hollow insulation tube lateral wall, divide
Be not set to hollow insulation tube upper and lower ends the first metal end plate and the second metal end plate, be axially set in from top to bottom it is hollow
Insulating vessel and at least two zinc oxide resistance sheets being stacked in insulation tube, the insulating vessel and zinc oxide electricity
Resistance piece lateral wall forms gap between hollow insulation tube inner sidewall, and the insulating vessel upper end is connected with the first metal end plate
It connects, the zinc oxide resistance sheet lower end is set on the second metal end plate；
The insulating vessel is telescopic bellows, and chamber is axially arranged with discharging gap structure in the inner；
The discharging gap structure includes the first discharge electrode and the second discharge electrode along the setting of insulating vessel axial separation, institute
The discharging gap that an arrester is formed between the first discharge electrode and the second discharge electrode is stated, first discharge electrode is set to
Insulating vessel upper end, second discharge electrode are set to insulating vessel lower end, and second discharge electrode lower end is soft by one
Property copper pigtail is connect with zinc oxide resistance sheet.
Preferably, the insulating vessel, discharging gap structure and zinc oxide resistance sheet and the hollow insulation tube are same
Axis setting.
Preferably, in the gap be filled with fluid insulating medium, the fluid insulating medium be insulating gas or
Person's insulating liquid.
Preferably, the material of first discharge electrode and the second discharge electrode is High-temperature resistant alloy material.
Preferably, gas-insulated medium is filled with inside the insulating vessel.
Preferably, first discharge electrode and the second discharge electrode are geometrically symmetric electrode structure.
Preferably, the hollow insulation tube is the cylindrical tube of hollow form, which is fiber-reinforced resin
Based composites are made.
Based on the above-mentioned technical proposal, of the invention that there is following technological merit compared with prior art:
1. the present invention uses variable in-line gap composite insulating metal oxide lightning arrester, the first metal end plate, discharging gap knot
Structure, flexible copper pigtail, the zinc oxide resistance sheet being stacked and the second metal end plate can form cascaded structure, so that operating normally
In the process, working voltage and the permitted Lightning Over-voltage of electrical equipment, switching overvoltage will not be applied to zinc oxide resistance sheet
On, its long-term electrification caused voltage ageing and heat damage phenomenon are avoided, the service life of metal oxide arrester is promoted
And performance reliability, guarantee the safe and stable operation of electric system to a certain extent.
2. generating electrical discharge arc, above-mentioned series connection between the first discharge electrode and the second discharge electrode when overvoltage occurs
Structure forms conductive path, and the nonlinear characteristic of zinc oxide resistance sheet is played, so that Overvoltage Amplitude is limited, electric discharge
High temperature caused by electric arc can make the air pressure in discharging gap region locally increase, and under the anticyclonic promotion in part, insulation is held
The bellows structure of device is axially extending, and the second discharge electrode moves down, so that the clearance distance of discharging gap expands, gap insulation is strong
Degree is promoted, and is conducive to the fast arc extinction of electrical discharge arc, avoids the afterflow arc phenomenon after overvoltage in short-term disappears.
3. being filled with fluid insulating medium in intermediate gap of the present invention, the electric insulating quality of arrester inner space is enhanced
Can, while the conduction and diffusion of heat can be accelerated using the mobility of fluid insulating medium, inhibit zinc oxide resistance sheet to pass through big
Fuel factor after electric current avoids the generation of heat damage.
4. the material of the first discharge electrode and the second discharge electrode is all made of High-temperature resistant alloy material in the present invention so that the
One discharge electrode and the second discharge electrode have excellent resistance to electrical arc erosion performance, ensure that the first discharge electrode and the second electric discharge
The service life of electrode.
5. the first discharge electrode and the second discharge electrode are all made of geometrically symmetric structure in the present invention, discharging gap may make
Structure obtains stable arc discharge performance.
6. the hollow insulation tube in the present invention is made of fiber-reinforced resin matrix compound material, thermal coefficient is improved, is accelerated
Heat transfer when high current is by inside arrester.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of variable in-line gap of the present invention composite insulating metal oxide lightning arrester.
In figure: 1. arresters, 2. hollow insulation tubes, 3. cluster parachute sets, 4. the first metal end plates, 5. second metal end plates, 6.
Insulating vessel, 7. discharging gaps, 8. zinc oxide resistance sheets, 9. gaps, 10. first discharge electrodes, 11. second discharge electrodes, 12.
Flexible copper pigtail, 13. fluid insulating mediums, 14. gas-insulated mediums.
Specific embodiment
Explanation that the present invention will be further explained with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of variable in-line gap composite insulating metal oxide lightning arrester, which includes hollow
Insulation tube 2, is respectively arranged at the of hollow 2 upper and lower ends of insulation tube at the cluster parachute being coated on hollow 2 lateral wall of insulation tube set 3
One metal end plate 4 and the second metal end plate 5, the insulating vessel 6 being axially set in hollow insulation tube 2 from top to bottom and at least
Two zinc oxide resistance sheets 8 being stacked, the insulating vessel 6 and 8 lateral wall of zinc oxide resistance sheet with hollow insulation
Gap 9 is formed between 2 inner sidewall of pipe, 6 upper end of insulating vessel is connected with the first metal end plate 4, the ZnO resistors
8 lower end of piece is set on the second metal end plate 5；
The insulating vessel 6 is telescopic bellows, and chamber is axially arranged with discharging gap structure in the inner；
The discharging gap structure includes the first discharge electrode 10 and the second discharge electrode along the setting of 6 axial separation of insulating vessel
11, the discharging gap 7 of an arrester, first electric discharge are formed between first discharge electrode 10 and the second discharge electrode 11
Electrode 10 is set to 6 upper end of insulating vessel, and second discharge electrode 11 is set to 6 lower end of insulating vessel, wherein the first electric discharge
The end of electrode 10 doubles as the upper surface of insulating vessel 6, and the end of the second discharge electrode 11 doubles as the lower end surface of insulating vessel 6,
Second discharge electrode, 11 lower end is connect by a flexible copper pigtail 12 with zinc oxide resistance sheet 8.
The insulating vessel 6, discharging gap structure and zinc oxide resistance sheet 8 and the hollow insulation tube 2 are coaxially disposed.
The arrester 1 is in parallel with electrical equipment, the first metal end plate 4 and the second metal end plate 5 respectively with high potential and
Ground potential is electrically connected, by the way that discharging gap structure is arranged, thus normal operating voltage and electrical equipment is permitted was struck by lightning
Voltage, switching overvoltage will not be applied on zinc oxide resistance sheet 8, avoid what the electrification for a long time of zinc oxide resistance sheet 8 was caused
Voltage ageing and heat damage phenomenon.When occurring more than the permitted Lightning Over-voltage of electrical equipment or switching overvoltage, between electric discharge
Electrical breakdown occurs for gap structure, electrical discharge arc is generated between the first discharge electrode 10 and the second discharge electrode 11, so that first
Metal end plate 4, discharging gap structure, flexible copper pigtail 12, the zinc oxide resistance sheet 8 being stacked and the formation of the second metal end plate 5
Conductive path, dash current enter ground through zinc oxide resistance sheet 8, and the nonlinear characteristic of zinc oxide resistance sheet 8 is played, and make conduction
The global voltage of access is limited, so that the Overvoltage Amplitude on the electrical equipment in parallel with arrester 1 is limited, electricity
Gas equipment is effectively protected.
When overvoltage causes generation electric arc between the first discharge electrode 10 and the second discharge electrode 11 in short-term, electric arc is drawn
The high temperature risen can make the air pressure moment in insulating vessel 6 increase, under internal anticyclonic promotion, the ripple of insulating vessel 6
Pipe structure stretches its lower end downwards, i.e., the second discharge electrode 11 moves down, so that the clearance distance of discharging gap 7
Expand, gap insulation strength enhancing is conducive to the quick extinguishing of electrical discharge arc, while can avoid after overvoltage in short-term disappears
Afterflow arc phenomenon.After arc extinction, temperature and air pressure in insulating vessel 6 are restored to normal condition, due to being no longer influenced by
The effect of pressure, lower end are shunk upwardly, i.e., the second discharge electrode 11 moves up, and initial position is returned to, so that putting
Electric gap 10 is restored to normal operating condition.
Fluid insulating medium 13 is filled in the gap 9, the fluid insulating medium 13 is insulating gas or insulation
Liquid.Above-mentioned insulating gas can be the gaseous mixture of dry air or nitrogen or sulfur hexafluoride or nitrogen and sulfur hexafluoride
Body；Above-mentioned insulating liquid can be silicone oil or mineral oil；While guaranteeing the electrical insulation properties in 9 space of gap, utilize
The mobility of fluid insulating medium 13 can accelerate the conduction and diffusion of heat, and zinc oxide resistance sheet 8 is inhibited to pass through after high current
Fuel factor avoids the generation of heat damage.
It is filled with gas-insulated medium 14 inside the insulating vessel 6, can be sulfur hexafluoride or nitrogen and hexafluoro
The mixed gas for changing sulphur guarantees between discharging in normal operating voltage and permitted Lightning Over-voltage, switching overvoltage effect
The electrical insulation properties of gap are also equipped with the characteristic of certain acceleration arc extinction when overvoltage starting arc occurs.
First discharge electrode 10 and the second discharge electrode 11 are geometrically symmetric electrode structure, geometrically symmetric electrode
Structure may make discharging gap structure to obtain stable electrical discharge arc.First discharge electrode 10 and the second discharge electrode 11
Material is High-temperature resistant alloy material, can be closed for copper-tungsten or silver tungsten or silver-colored tungsten graphite alloy or silver-colored molybdenum
Gold, good in oxidation resistance, conductivity are high, and have excellent resistance to electrical arc erosion performance, it is ensured that electrode is not damaged after multiple discharge
Wound.
The hollow insulation tube 2 is the cylindrical tube of hollow form, which is fiber-reinforced resin matrix compound material
It is made, is electric insulating quality fiber and resin matrix by winding or pultrude process molding, has the advantages that high-strength light, on
Stating electric insulating quality fiber can be able to be epoxy for glass fibre or aramid fiber or polyester fiber, above-mentioned resin matrix
Resin or phenolic resin or vinylite.
Cluster parachute set 3 is the prior art, cluster parachute set 3 be by silicon rubber vulcanization forming covered in the outside of hollow insulation tube 2 and
It constitutes, the exterior insulation performance of arrester 1 can be enhanced.Above-mentioned silicon rubber can be high-temperature silicon disulfide rubber or room temperature vulcanization
Silicon rubber or liquid silastic.
The insulating vessel 6 is made of insulating polymeric material, which can be polypropylene or Buddhist nun
Dragon or polytetrafluoroethylene (PTFE) can also be resistant to short when electric arc occurs in discharging gap 7 while guaranteeing electrical insulation properties
Shi Gaowen plays a protective role to insulating vessel 6.
Further, heat filling is uniformly filled in the resin matrix as hollow 2 basis material of insulation tube.On
Stating heat filling can be aluminium oxide or magnesia or zinc oxide or aluminium nitride or boron nitride or silicon carbide.It is protecting
While demonstrate,proving the electrical insulation properties of hollow insulation tube 2, its thermal coefficient is improved, when accelerating high current by 1 inside of arrester
Heat transfer.
Further, high thermal conductivity filler is uniformly filled in the silicon rubber for covering 3 basis materials as cluster parachute.It is above-mentioned
High thermal conductivity filler can be aluminium hydroxide or calcium carbonate or silica.Guaranteeing the electrical insulation properties of cluster parachute set 3
Meanwhile its thermal coefficient is improved, accelerate heat transfer when high current passes through 1 inside of arrester.
Above content is example and explanation of the invention, but does not mean that the obtainable advantage of the present invention is so limited, all
It is wherein one the advantages of may being realized in simple transformation, and/or some embodiments to structure in practice process of the present invention
It is a or it is multiple within the scope of protection of this application.
Claims (7)
1. a kind of variable in-line gap composite insulating metal oxide lightning arrester, it is characterised in that: the arrester (1) includes hollow
Insulation tube (2), is respectively arranged at hollow insulation tube (2) up and down at the cluster parachute set (3) being coated on hollow insulation tube (2) lateral wall
The first metal end plate (4) and the second metal end plate (5) at both ends, be axially set in from top to bottom it is exhausted in hollow insulation tube (2)
Edge container (6) and at least two zinc oxide resistance sheets (8) being stacked, the insulating vessel (6) and ZnO resistors
Piece (8) lateral wall forms gap (9) between hollow insulation tube (2) inner sidewall, insulating vessel (6) upper end and the first gold medal
Belong to end plate (4) to be connected, zinc oxide resistance sheet (8) lower end is set on the second metal end plate (5)；
The insulating vessel (6) is telescopic bellows, and chamber is axially arranged with discharging gap structure in the inner；
The discharging gap structure includes the first discharge electrode (10) and the second electric discharge along the setting of insulating vessel (6) axial separation
Electrode (11) forms the discharging gap (7) of an arrester between first discharge electrode (10) and the second discharge electrode (11),
First discharge electrode (10) is set to insulating vessel (6) upper end, and second discharge electrode (11) is set to insulating vessel
(6) lower end, the second discharge electrode (11) lower end are connect by a flexible copper pigtail (12) with zinc oxide resistance sheet (8).
2. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
Insulating vessel (6), discharging gap structure and zinc oxide resistance sheet (8) and the hollow insulation tube (2) are coaxially disposed.
3. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
Fluid insulating medium (13) are filled in gap (9), the fluid insulating medium (13) is insulating gas or insulating liquid.
4. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
The material of first discharge electrode (10) and the second discharge electrode (11) is High-temperature resistant alloy material.
5. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
Gas-insulated medium (14) are filled with inside insulating vessel (6).
6. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
First discharge electrode (10) and the second discharge electrode (11) are geometrically symmetric electrode structure.
7. variable in-line gap according to claim 1 composite insulating metal oxide lightning arrester, it is characterised in that: described
Hollow insulation tube (2) is the cylindrical tube of hollow form, which is made of fiber-reinforced resin matrix compound material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259664.2A CN109887693A (en) | 2019-04-02 | 2019-04-02 | A kind of variable in-line gap composite insulating metal oxide lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259664.2A CN109887693A (en) | 2019-04-02 | 2019-04-02 | A kind of variable in-line gap composite insulating metal oxide lightning arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109887693A true CN109887693A (en) | 2019-06-14 |
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| CN201910259664.2A Pending CN109887693A (en) | 2019-04-02 | 2019-04-02 | A kind of variable in-line gap composite insulating metal oxide lightning arrester |
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| CN110364317A (en) * | 2019-08-05 | 2019-10-22 | 国网宁夏电力有限公司 | A kind of protective case improving the resistance to voltage levels of znr valve block |
| CN111725703A (en) * | 2020-07-02 | 2020-09-29 | 广东电网有限责任公司 | Lightning arrester of distribution line |
| CN114242359A (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 pressure relief device |
| CN114629005A (en) * | 2021-04-23 | 2022-06-14 | 南宁超伏电气科技有限公司 | Enhanced lightning protection insulator and arc extinguishing method |
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| CN110364317A (en) * | 2019-08-05 | 2019-10-22 | 国网宁夏电力有限公司 | A kind of protective case improving the resistance to voltage levels of znr valve block |
| CN111725703A (en) * | 2020-07-02 | 2020-09-29 | 广东电网有限责任公司 | Lightning arrester of distribution line |
| CN114629005A (en) * | 2021-04-23 | 2022-06-14 | 南宁超伏电气科技有限公司 | Enhanced lightning protection insulator and arc extinguishing method |
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| CN114640026B (en) * | 2021-04-23 | 2023-12-29 | 南宁超伏电气科技有限公司 | Three-state combined arc extinguishing device and arc extinguishing method |
| CN114242359A (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 pressure relief device |
| CN114242359B (en) * | 2021-12-17 | 2023-11-17 | 宁波市镇海国创高压电器有限公司 | Lightning arrester with pressure relief device |
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