CN207518051U - A kind of multi-chamber clearance lightning-proof device arc blow-out structure - Google Patents
A kind of multi-chamber clearance lightning-proof device arc blow-out structure Download PDFInfo
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- CN207518051U CN207518051U CN201721689152.2U CN201721689152U CN207518051U CN 207518051 U CN207518051 U CN 207518051U CN 201721689152 U CN201721689152 U CN 201721689152U CN 207518051 U CN207518051 U CN 207518051U
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Abstract
The utility model is related to multi-chamber clearance lightning-proof device arc blow-out structure, including two metal electrodes being arranged symmetrically being embedded in silicone insulation material；The distance between two described metal electrode arc surfaces form the air gap, and the line of the shortest distance is located in the air gap between two metal electrode arc surfaces；It is surrounded by the bottom surface of the air gap, the arc surface of two metal electrodes and the silicone insulation material immediately below the air gap and is formed cylindrical air cavity, the cylindrical arc blow-out hole connected with the air gap is provided on the silicone insulation material right over the air gap.It is realized in guiding high temperature and high pressure gas energy quick release to atmospheric environment by arc blow-out structure, ensure the physical quantity indexes such as direction, rate, the pressure during lightning protection device arc blow-out, ensure the ability of lightning protection device cut-out power frequency continued flow and restore the time of line insulation intensity, so as to fulfill the lightning protection function of device.
Description
Technical field
The utility model is related to power system high tension power line anti-thunder technical fields, and in particular to a kind of multi-chamber gap
Lightning protection device arc blow-out structure.
Background technology
With the research that deepens continuously of circuit on power system arrester, the application rapid development of various Novel lightning arresters.Its
The characteristic that middle multi-chamber gap arrester generates multistage electric arc using gas gap electric discharge in high-voltage technology carries out lightning Protection Design.
In actual application, under lightning impulse current effect, air is in burning arc plasma in the middle chamber of multi-chamber gap
Generation force of explosion can be drastically expanded under effect, under the collective effect of force of explosion and electromagnetic power, arc blow-out channel guiding high temperature is high
Press that gas energy is quick, powerful release is in atmospheric environment, realizing arc blow-out, blow-out effect.In multi-chamber clearance lightning-proof device
During blow-out, the structure design of arc blow-out channel directly determines the physical quantitys such as direction, speed, the pressure of lightning protection device arc blow-out, this
A little basic concepts determine that lightning protection device quickly cuts off the ability of power frequency continued flow and restores the time of line insulation intensity, are lightning protection
The whether effective criterion of device lightning protection function.
Invention content
The purpose of this utility model provides a kind of multi-chamber clearance lightning-proof device arc blow-out aiming at the deficiency of above-mentioned technology
Structure is realized by arc blow-out structure in guiding high temperature and high pressure gas energy quick release to atmospheric environment, it is ensured that lightning protection device is blown
The physical quantity indexes such as direction, rate, pressure during arc ensure the ability of lightning protection device cut-out power frequency continued flow and recovery circuit
The time of dielectric strength, so as to fulfill the lightning protection function of device.
To achieve the above object, the multi-chamber clearance lightning-proof device arc blow-out structure designed by the utility model, including insertion
Two metal electrodes being arranged symmetrically in silicone insulation material；The formation of the distance between two metal electrode arc surfaces
The air gap, and the line of the shortest distance is located in the air gap between two metal electrode arc surfaces, the sky
The shortest distance lines of gas gap g in the horizontal direction are conllinear with the line；
By the bottom surface of the air gap, the arc surface of two metal electrodes and described immediately below the air gap
Silicone insulation material surrounds to form cylindrical air cavity c, is opened on the silicone insulation material right over the air gap
There are the cylindrical arc blow-out hole connected with the air gap, and the axis and two metal electrodes in the cylindrical arc blow-out hole
Line of symmetry it is conllinear.
Further, the cylindrical arc blow-out hole extends to exhausted by being arranged on the silica gel after lightning protection device body surface
The boss of edge material end continues to extend until being in communication with the outside, and the boss and the silicone insulation material same material.
Further, the subsequent corrosion R of the metal electrode arc surfaceeFor 4~6mm.
Further, the shortest distance wire length l of the air gap in the horizontal directiongFor 0.8~1.2mm, institute
The a diameter of 1mm of the air gap in the in-plane direction is stated, distance of the air gap top surface apart from the line is 0.5mm,
Distance of the air gap bottom surface apart from the line is 0.5mm.
Further, the shortest distance of the cylindrical air cavity bottom surface apart from the air gap in the horizontal direction
The vertical range l of linecIn 2~4mm.
Further, shortest distance line of the cylindrical arc blow-out pitch-row from the air gap in the horizontal direction
Depth htFor 8~14mm, and the diameter d of the cylindrical arc blow-out hole ttFor 3~4mm.
Further, the boss is the truncated cone-shaped boss formed by silicon rubber vulcanization, the bottom of the truncated cone-shaped boss
Radius surface R is 3~4.5mm, upper bottom surface radius r is 2.5~4mm, and R-r=0.5mm, and the height h of the truncated cone-shaped boss is 3
~6mm.
The utility model compared with prior art, has the following advantages：
1st, lightning protection device has relatively low when the subsequent corrosion design of metal electrode arc surface e determines overvoltage invasion
50% percussion action voltage, suitable arc root area can avoid heat from excessively concentrating during arcing, effectively reduce electrode erosion degree；
2nd, under the effect of the 8/20 μ s lightning currents of nominal 5kA, the distance design of the air gap g can ensure that in large-scale thunder
In current amplitude, arc-plasma can obtain larger barometric gradient, so as to obtain maximum initial acceleration, be moved in air
It is easier to be elongated to form long arc under power, it is quick to improve arc road pressure drop, power frequency continued flow is inhibited to increase
3rd, under the effect of the 8/20 μ s lightning currents of nominal 5kA, the design of cylindrical air cavity c ensures have below arcing
Suitable air reserve generates enough arc blow-out energy in arcing by air expansion；
4th, under the effect of the 8/20 μ s lightning currents of nominal 5kA, the diameter d of cylindrical arc blow-out hole ttWith depth htDimensional fits
Optimal aerodynamic performance, i.e. depth h can be obtainedtIt may insure to obtain maximum arc-plasma muzzle velocity,
Powerful motive force during holding arc blow-out is conducive to improve blow-out speed；
5th, the configuration design of boss f can extend cylindrical arc blow-out hole t under conditions of lightning protection device ontology diameter is not increased
Length, at the same prevent along during the rain drop erosion of face since surface tension enters in cylindrical arc blow-out hole t.
Description of the drawings
Fig. 1 is the utility model multi-chamber clearance lightning-proof device arc blow-out structure diagram；
Fig. 2 is the scale diagrams of Fig. 1.
Each part numbers are as follows in figure：
Line a, cylindrical air cavity c, metal electrode d, arc surface e, boss f, the air gap g, silicone insulation material
M, cylindrical arc blow-out hole t.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
Multi-chamber clearance lightning-proof device arc blow-out structure as shown in Figure 1, two including being embedded in silicone insulation material m right
Claim the metal electrode d of arrangement, the distance between two metal electrode d arc surfaces e form the air gap g, and two metal electrodes
The line a of the shortest distance is located in the g of the air gap between d arc surfaces e, and the shortest distances of the air gap g in the horizontal direction connect
Line is conllinear with line a；It is exhausted by the bottom surface of the air gap g, the arc surface e of two metal electrode d and silica gel immediately below the g of the air gap
Edge material m, which is surrounded on the silicone insulation material m to be formed right over cylindrical air cavity c, the air gap g, to be provided with and the air gap
The cylindrical arc blow-out hole t of g connections, and the axis of cylindrical arc blow-out hole t is conllinear with the line of symmetry of two metal electrode d；In addition, circle
Cylindricality arc blow-out hole t continues to extend after extending to lightning protection device body surface by being arranged on the boss f of silicone insulation material m ends
Until it is in communication with the outside, and boss f and silicone insulation material m same materials.
Wherein, as shown in Fig. 2, the subsequent corrosion R of metal electrode d arc surfaces eeFor 4~6mm, metal electrode d arc surfaces e
Subsequent corrosion ReLightning protection device has 50% relatively low percussion action voltage when design determines overvoltage invasion, and when arcing closes
Suitable arc root area can avoid heat from excessively concentrating, and effectively reduce electrode erosion degree.In conventional 5kA lightning impulses discharge capacity
Under technology requirement, ReArc root area is too small when cambered surface arc burning is easily caused during ＜ 4mm causes heat to be concentrated, and arc surface deteriorates sternly
Weight, influences performance；ReAlthough be conducive to radiate during ＞ 6mm, avoid arc surface electric arc calcination, but improve the distribution of curved surface electric field
The uniformity, local field strength become smaller, and are unfavorable for cathode electronics effusion, and the lightning impulse 50% for improving lightning protection device entirety acts electricity
Pressure.
The shortest distance wire length l of the air gap g in the horizontal directiongFor 0.8~1.2mm, the air gap g is in plane
A diameter of 1mm on direction, distance of the air gap g top surfaces apart from line a are 0.5mm, and the air gap g bottom surfaces are apart from line a
Distance be 0.5mm, the shortest distance wire length l of the air gap g in the horizontal directiongDesign and metal electrode arc surface
E is closely related.It is interdicted in simulation test according to power frequency continued flow in laboratory, the cambered surface in the test of normal power frequency continued flow breaking capacity
Arcing metal melting particle maximum gauge about 0.5mm, works as lgDuring ＜ 0.8mm, molten metal particles easily cause clearance air path
Short circuit can not form air ionization and generate high-temperature plasma, lightning protection device failure；Work as lgDuring ＞ 1.2mm, single arc blow-out structure
50% operation voltage of lightning impulse can raise, do not allowed more than the condition of 100kV by lightning protection device lightning impulse operation voltage
Limitation causes series connection arc blow-out number of structures to reduce, reduces the power frequency continued flow breaking capacity under lightning protection device declared working condition.Cause
This, in the present embodiment, under the 8/20 μ s lightning currents effect of nominal 5kA, the shortest distances of the air gap g in the horizontal direction connect
Line length lgDistance design for 0.8~1.2mm can ensure that in large-scale amplitude of lightning current arc-plasma can obtain
Larger barometric gradient is obtained, so as to obtain maximum initial acceleration, is easier to be elongated to form long arc under air force, quickly
Arc road pressure drop is improved, power frequency continued flow is inhibited to increase.
Cylindrical air cavity c bottom surfaces apart from the air gap g shortest distance lines in the horizontal direction (i.e. line a's)
Vertical range lcIn 2~4mm, it is air reserve cavity volume immediately below limitation the air gap g that this, which requires purpose,.Meeting 4mm
＜ Re＜ 6mm and 0.8mm ＜ lgUnder the conditions of ＜ 1.2mm, if lc＜ 2mm cause cylindrical air cavity c volumes less than normal,
Under nominal 5kA lightning impulse currents effect, air heating swelling volume is insufficient in cylindrical air chamber body, causes intracavity gas temperature
Height is spent, expansion work reduces, and power frequency continued flow electric arc, failure of apparatus can not be cut off under serious conditions；Work as lcDuring ＞ 4mm, cause
Cylindrical air cavity c volumes are bigger than normal, and under the effect of nominal 5kA lightning impulse currents, intracavity gas temperature is too low, equally causes
Expansion work is insufficient, can not form good arc blow-out effect, failure of apparatus.Therefore, in the present embodiment, in 8/20 μ of nominal 5kA
Under the effect of s lightning currents, the design of cylindrical air cavity c ensures there is suitable air reserve below arcing, leads in arcing
It crosses air expansion and generates enough arc blow-out energy.
Shortest distance line (the i.e. depth of line a) of the cylindrical arc blow-out hole t apart from the air gap g in the horizontal direction
htFor 8~14mm, and the diameter d of cylindrical arc blow-out hole ttFor 3~4mm.According to the design of cylindrical air cavity c volumes,
Volume about 3~5mm3, with volume 4mm3Based on, it is act as with nominal 5kA lightning currents according to simulation calculation, internal gas
Temperature variation range is about distributed between 5000~8000K, is counted according to gases expansion volume calculation formula Vt=V0 (1+ α t)
It calculates, gas volume variation Vt=4* (1+3.676 × 10-3× 5000)=73.5mm3。
V0 is initial volume in above formula, and Vt is final volume, and α is the air coefficient of expansion, and t is gas temperature changing value.Circle
The diameter d of cylindricality arc blow-out hole ttBy subsequent corrosion ReWith the shortest distance wire length l of the air gap g in the horizontal directiongLimit
System, preferably 3~4mm.With dtA diameter of 3mm, Vt=73.5mm3Calculate arc blow-out hole depth As cylindrical arc blow-out hole depth htIt can ensure that gas expansion persistently does work in 11mm, in outlet port plasma
Egress rate reaches peak value.Depth is excessive, and cylindrical arc blow-out hole t internal frictions cause plasma rate to decline；Depth mistake
It is small, expand when plasma is not up to maximum rate in calculation to air.It is larger in view of the thunder and lightning probability distribution of nominal 5kA,
To meet the relatively small other amplitude of lightning current of probability, preferably cylindrical arc blow-out hole t depth htFor 8~14mm, to adapt to
Operating mode application in most of natural environments.
Therefore, in the present embodiment, under the 8/20 μ s lightning currents effect of nominal 5kA, the diameter d of cylindrical arc blow-out hole ttWith
Depth htDimensional fits can obtain optimal aerodynamic performance, according to the equation of gas state
Q=c*m* △ T；
Wherein, the energy of the lower heat gas of 8/20 μ s lightning currents effect that Q is nominal 5kA, c hold for the specific heats of gases, and m is
Gaseous mass, △ T are gas temperature liter.
△ T=Q/cm are obtained by above formula；
The establishing criteria equation of gas state：
P*V=n*R*T；
Wherein T is temperature；R is gas constant；P is pressure；N is molal quantity；V is arc-chutes volume.
The product constant of P*V in expansion process after energy is absorbed, and since arc blow-out channel is in communication with the outside in gas, i.e.,
Interrupter pressure tends to external atmosphere pressure always, and the maximum variable quantity △ T for calculating T can converse corresponding V values, in cylinder
Volume variation △ V are maximum when pressure is consistent inside and outside shape arc blow-out hole t.
Due to △ V ≈ ht* π dt2/4
Here ht can be regarded as the range of gas expansion for doing work.
Diameter d can be acquired according to △ V variable quantitiestArc blow-out hole depth ht.The depth h acquiredtIt may insure to obtain maximum
Arc-plasma muzzle velocity keeps powerful motive force during arc blow-out, is conducive to improve blow-out speed.
Boss f is the truncated cone-shaped boss formed by silicon rubber vulcanization, the bottom radius surface R of truncated cone-shaped boss for 3~
4.5mm, upper bottom surface radius r are 2.5~4mm, and R-r=0.5mm, the height h of truncated cone-shaped boss is 3~6mm.It is blown by cylinder
The depth h of arc hole ttFor 8~14mm and diameter dtFor 3~4mm constraints, it is preferable that the bottom radius surface R of truncated cone-shaped boss
Upper bottom surface radius r for 3~4.5mm, truncated cone-shaped boss is 2.5~4mm.Inner wall production in arc blow-out hole during to ensure gas expansion for doing work
Raw pressure needs certain thickness silicon rubber to ensure that arc blow-out hole does not rupture, is verified according to laboratory test, thick
Degree is no less than 0.5mm.Truncated cone-shaped boss height is by electrode insulation thickness and cylindrical arc blow-out hole t depth htLimitation, truncated cone-shaped
The height h of boss is preferably chosen in 3~6mm.In addition, the configuration design of boss f can not increase lightning protection device ontology diameter
Under conditions of extend cylindrical arc blow-out hole t/length, while prevent from blowing since surface tension enters cylinder along during the rain drop erosion of face
In the t of arc hole.
* in above-mentioned is to be multiplied by ,-it is minus sign.
Claims (7)
1. a kind of multi-chamber clearance lightning-proof device arc blow-out structure, including two symmetrical cloth being embedded in silicone insulation material (m)
The metal electrode (d) put；It is characterized in that：The distance between two described metal electrode (d) arc surfaces (e) form the air gap
G, and between two metal electrode (d) arc surfaces (e) shortest distance line (a) in the air gap (g), institute
It is conllinear with the line (a) to state the shortest distance line of the air gap (g) in the horizontal direction；
By the bottom surface of the air gap (g), the arc surface of two metal electrodes (d) immediately below the air gap (g)
(e) and the silicone insulation material (m) surrounds to form cylindrical air cavity (c), described right over the air gap (g)
The cylindrical arc blow-out hole (t) connected with the air gap (g), and the cylindrical arc blow-out are provided on silicone insulation material (m)
The axis in hole (t) is conllinear with the line of symmetry of two metal electrodes (d).
2. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 1, it is characterised in that：The cylinder arc blow-out hole
(t) continue to extend by being arranged on the boss (f) of silicone insulation material (m) end after extending to lightning protection device body surface
Until it is in communication with the outside, and the boss (f) and silicone insulation material (m) same material.
3. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 1 or claim 2, it is characterised in that：The metal electrode
(d) the subsequent corrosion R of arc surface (e)eFor 4~6mm.
4. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 1 or claim 2, it is characterised in that：The air gap
(g) shortest distance wire length l in the horizontal directiongFor 0.8~1.2mm, the air gap (g) is in the in-plane direction
A diameter of 1mm, distance of the air gap (g) top surface apart from the line (a) be 0.5mm, the air gap (g) bottom surface
Distance apart from the line (a) is 0.5mm.
5. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 1 or claim 2, it is characterised in that：The cylindrical empty
The vertical range l of shortest distance line of air cavity (c) bottom surface apart from the air gap (g) in the horizontal directionc2~
4mm。
6. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 1 or claim 2, it is characterised in that：The cylinder is blown
The depth h of shortest distance line of the arc hole (t) apart from the air gap (g) in the horizontal directiontFor 8~14mm, and it is described
The diameter d of cylindrical arc blow-out hole (t)tFor 3~4mm.
7. multi-chamber clearance lightning-proof device arc blow-out structure according to claim 2, it is characterised in that：The boss (f) is served as reasons
The truncated cone-shaped boss that silicon rubber vulcanization forms, the bottom radius surface R of the truncated cone-shaped boss is 3~4.5mm, upper bottom surface radius r
For 2.5~4mm, and R-r=0.5mm, the height h of the truncated cone-shaped boss is 3~6mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689152.2U CN207518051U (en) | 2017-12-07 | 2017-12-07 | A kind of multi-chamber clearance lightning-proof device arc blow-out structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689152.2U CN207518051U (en) | 2017-12-07 | 2017-12-07 | A kind of multi-chamber clearance lightning-proof device arc blow-out structure |
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| CN207518051U true CN207518051U (en) | 2018-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063366A (en) * | 2017-12-07 | 2018-05-22 | 武汉水院电气有限责任公司 | A kind of multi-chamber clearance lightning-proof device arc blow-out structure |
-
2017
- 2017-12-07 CN CN201721689152.2U patent/CN207518051U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063366A (en) * | 2017-12-07 | 2018-05-22 | 武汉水院电气有限责任公司 | A kind of multi-chamber clearance lightning-proof device arc blow-out structure |
| CN108063366B (en) * | 2017-12-07 | 2023-04-21 | 武汉水院电气有限责任公司 | Multi-chamber clearance lightning protection device blows arc structure |
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