CN1540685A - Composite housing type lightning arrester - Google Patents
Composite housing type lightning arrester Download PDFInfo
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- CN1540685A CN1540685A CNA03113310XA CN03113310A CN1540685A CN 1540685 A CN1540685 A CN 1540685A CN A03113310X A CNA03113310X A CN A03113310XA CN 03113310 A CN03113310 A CN 03113310A CN 1540685 A CN1540685 A CN 1540685A
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- valve body
- lightning arrester
- metal electrode
- valve block
- composite sheath
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Abstract
The lightning arrester includes composite housing (5), valve body setup in cavity of composite housing (5) fixedly, upper metal electrode fixed on top part of the valve body, and lower metal electrode fixed on low part of the valve body. Characters are that the valve body is in columned long bar shape. Ratio between thickness H of long bar type valve body and diameter D is larger than 2. the lightning arrester features high mechanical strength fewer manufacturing steps.
Description
Technical field
The present invention relates to a kind of lightning arrester.
Background technology
In the prior art; the critical piece of the polymeric metal oxide surge arrester that the 6-35kV electric power system is used is round pie or circular metal oxide non-linear resistor; hereinafter to be referred as valve block; see accompanying drawing 1 or 2; the main manufacturing procedure of valve block is: (1), the good burning raw material of proportioning through calcination, levigate, add after bond and other auxiliary agent mix; in press spray drying-granulating machine, cause particle, so that better compression moulding by particle size distribution.(2), the material after the granulation is put into mould cylindraceous, being pressed into diameter in hydraulic press is that D and thickness are round pie (seeing accompanying drawing 1) or circular (seeing accompanying drawing 2) valve block base substrate of H.(3), heat and get rid of bond and other auxiliary agent in the valve block base substrate, pre-burning is coated with the resistive formation that inorganic material is made in the valve block side, finally fires.(4), the both ends of the surface of valve block polish by the double cutting separating disk machine, clean with ultrasonic waves for cleaning, oven dry is carried out (wearing out) heat treatment at the laggard electric furnace of the aluminium-plated making electrode of both ends of the surface.(5), valve block side coating organic insulator glaze.(6), each sheet is carried out customary outward appearance, electric property parameter testing, to carry out may be destructive electric property spot check test to the valve block that extracts certain proportion quantity.
Have the valve block of compression moulding in hydraulic press now, the ratio H/D of its thickness H and diameter D is general all to be no more than 1, this be because:
(1), during moulding, becomes particle although put into the raw material mist projection granulating of valve block mould, but be entrained with certain air by particle size distribution.When H was blocked up, the interior air of die cavity was difficult for draining only during compacting, causes the layering of valve block base substrate gas enclosure.Under the top-down high pressure of hydraulic press, the material and the die cavity medial surface of preliminary compacting have friction, have influenced the transmission of pressure, cause the density of valve block base substrate of compacting up big and down small.When burning till, the valve block that density is big shrinks little, otherwise shrinks big.Become pyramid type (seeing accompanying drawing 3) so that burn till the back; In order to eliminate this phenomenon, adopt the method for two-way pressurization up and down, can improve H to a certain extent, but H is when increasing to a timing value, it is big both ends of the surface density to occur, and middle little situation is seen accompanying drawing 4 after burning till.
Employing is floated and is added the mode of vibration, H/D is reached or omit to surpass 1, but the report that has above 1.5 is seen at the end.
(2), the density irregularity suppressed when blocked up of valve block is equal, it is also inhomogeneous finally to cause valve block to make back density.When releasing overvoltage, the current density that flows through the valve block unit are also is uneven, can cause partial breakdown.
(3), when valve block is too thick, the aluminium-plated required frock of abrasive disc, both ends of the surface realizes difficulty.
(4), be subjected to the restriction of valve block selective examination electrical test equipment parameter, valve block is too thick, electric spot check test is difficulty.
(5), lightning arrester is to classify by different fields of employment in China, the electric parameter of the same thickness valve block of same diameter is certain, the lightning arrester of same field of employment adopts the valve block of the same thickness of same diameter, the lightning arrester electric property parameter of the different electric pressures in same field of employment is different, so can adopt the valve block stack of the same thickness of same diameter, this moment, too thick valve block did not satisfy the required combo requirement of lightning arrester electric parameter, it is too many for example to add a slice, subtract a slice very little, half sheet can't superpose.
Valve block is owing to make, and the electric parameter of same thickness valve block has certain dispersiveness, and thinner, the more valve block of stack quantity can be offset the dispersiveness of valve block, to satisfy the requirement of valve block combo.
In sum: the thickness of existing valve block is subjected to the restriction of pressed density, abrasive disc, coating electrode, combo and spot check test, and its H/D generally is no more than 1.
Lightning arrester need bear certain mechanical force when installing and using, as pulling force, moment of flexure etc.And the stack of several pieces valve blocks merely can't be born these power.So existing composite sheath arrester without gaps is to be superimposed as column by several pieces or tens of valve blocks, pack in the composite sheath of making by insulating material, form cylindric rigidity body, load onto metal electrode at its two.The mechanical force that lightning arrester bore is born by composite sheath by metal electrode, and the polymeric housed metal oxide arrester that series gap or parallel connection gaps are arranged only is superpose on the valve block post series gap or parallel connection gaps again.
Accompanying drawing 5 is the structure of existing wound form polymeric housed metal oxide arrester, and after valve block 3 combos of several pieces same thickness same diameter, under the prerequisite that satisfies the lightning arrester electric property parameter of being assembled, two adds metal electrode 4 and 5, superposes, compresses.With the radially or axial writhing number layer of glass fiber impregnated band winding layer 6, be heating and curing, form the pole that can bear various power, its appearance enters the vulcanizer sulfidization molding after being coated with coupling molecule.
Accompanying drawing 6 is the structure of existing epoxy tube or plastic tube polymeric housed metal oxide arrester, valve block after the combo is packed into and is adapted with the valve block external diameter and have in the epoxy tube or plastic tube 9 of certain wall thickness, the two ends internal diameter of epoxy tube 9 has screw thread can screw on metal electrode 4 and following metal electrode 7, forms the pole that can bear various power.Owing between epoxy tube inwall and valve block certain space is arranged, when entering the vulcanizer sulfuration, in mould under the HTHP, the gas in space is discharged in the epoxy tube, and the outer composite material sulfuration of epoxy tube has thereafter stoped the answer of gas, so form negative pressure behind the epoxy tube inner chamber sulfidization molding, have living space in the epoxy tube simultaneously, exist the possibility of humid air invasion during the lightning arrester operation, and negative pressure and wet gas can greatly be damaged the insulation and the electric property of lightning arrester.Can vacuumize in pipe this moment, injects insulating resin and solidify the entity that makes a no air gap of its formation.Also can on tube wall, punch, in the composite sheath sulfidization molding, utilize the flow properties of composite material, composite material is injected in the epoxy tube.
Accompanying drawing 7 is the structure of the polymeric housed metal oxide arrester of thermoset plastics compacting, and the valve block two after the combo is loaded onto metal electrode and built up cylindric; Put into one cylindricly after the clamping, slightly larger in diameter is in the former mould; Add thermoset plastics; Curing molding on vulcanizer forms the pole that can bear various power.
Referring to accompanying drawing 8 and accompanying drawing 9, metal electrode is loaded onto at the valve block two after the combo, with several insulating bars 12 or insulation board 13 clampings; Wear an insulating bar 12 in the middle of the ring-shaped valve, two is fastening.Form the rod that can bear various power.
In sum, do not have H/D in the prior art greater than 1.5 valve body, this mainly is that technology prejudice causes, and existing valve body is owing to have a plurality of, therefore each sheet all needs moulding, abrasive disc, aluminium-plated, side to be coated with high resistant and insulation glaze, every electric performance test etc., and manufacturing procedure is many.
Summary of the invention
The object of the present invention is to provide the bigger composite sheath formula lightning arrester of a kind of thickness and diameter ratio.
Technical scheme of the present invention is: a kind of composite sheath formula lightning arrester, comprise composite sheath, be fixedly arranged at valve body in the inner chamber of described composite sheath, be fixed on the upper end of described valve body last metal electrode, be fixed on the following metal electrode of the bottom of described valve body, described valve body is the long clavate valve body of cylinder formula, and the thickness H of described long bar type valve body and the ratio of diameter D are greater than 2.
The present invention compared with prior art has following advantage:
(1), production process is few.
Existing valve body is made, and is example with 10kV system polymeric housed metal oxide arrester, needs 5-8 sheet valve block (looking the size of H) usually.Each sheet all needs moulding, abrasive disc, aluminium-plated, side to be coated with high resistant and insulation glaze, every electric performance test etc.And long excellent type valve body need only one, and its workload is the former 1/5-1/8.
(2), existing polymeric housed metal oxide arrester should accomplish inner no air gap, just be not easy to flexible member is set in inside.Therefore lightning arrester is prone to loose contact between valve block and valve block, valve block and the metal electrode when bearing pulling force, moment of flexure and expanding with heat and contract with cold; When sulfidization molding, under HTHP, easily inject a spot of composite material between valve block and valve block, valve block and the metal electrode.In the case, partial discharge appears in lightning arrester, causes rapid deterioration.The latter can be got rid of in the lightning arrester work-in-process inspection but be influenced the qualification rate of product, and the former just occurs in the lightning arrester use, so more should be noted.The lightning arrester that the long clavate valve body that the present invention proposes is made is because core body itself promptly is the valve body that one-shot forming is burnt till, and electrode is to be bonded as one with electroconductive binder and valve body, so loose contact and partial discharge problem can not occur.
(3), the present little problem of polymeric housed metal oxide arrester structure ubiquity mechanical strength remaining.Because the stack valve block need lean on the support of rigidity insulating material to fix, and insulating material is organic material mostly, as epoxy tube, glass fiber impregnated band, epoxy spike pulling (insulating bar), thermoset plastics etc., these material rigidity are poor, toughness is big, yielding, and amount of deflection is arranged.Can only satisfy the requirement of strength of general lightning arrester, can not open high-flexural strength as height truly is anti-, and multiduty lightning arrester (as pillar lightning arrester, insulator lightning arrester etc.).The long clavate valve body that the present invention proposes itself is an inorganic electronic ceramic sintered body, and it is good to have rigidity, the intensity height, and advantages such as stressed no distortion can not only be made porcelain strut insulator but also work as lightning arrester and use.
Description of drawings
Accompanying drawing 1 is the topology view of round pie valve block of the prior art;
Accompanying drawing 2 be circular valve block of the prior art topology view;
Accompanying drawing 3 is the topology view behind the round pie valve block sintering;
Accompanying drawing 4 is the topology view behind the round pie valve block sintering;
Accompanying drawing 5 is the structure chart of a kind of wound form polymeric housed metal oxide arrester of the prior art;
Accompanying drawing 6 is the structure chart of a kind of epoxy tube of the prior art or plastic tube polymeric housed metal oxide arrester;
Accompanying drawing 7 is the structure chart of the polymeric housed metal oxide arrester of a kind of thermoset plastics compacting of the prior art;
Accompanying drawing 8 is the structure chart of clipping polymeric housed metal oxide arrester of the prior art;
Accompanying drawing 9 is the structure chart of the clipping polymeric housed metal oxide arrester of another kind of the prior art;
Accompanying drawing 10 is a kind of example structure figure of the present invention;
Accompanying drawing 11 is another kind of example structure figure of the present invention;
Accompanying drawing 12 is the third example structure figure of the present invention; Wherein:
1, spraying aluminium electrode; 2, insulating resin; 3, valve body; H, thickness; D, diameter; 4, go up metal electrode; 5, composite sheath; 6, glass fiber impregnated band winding layer; 7, following metal electrode; 8, spring; 9, epoxy tube; 10, thermoset plastics; 11, core chamber inserts; 12, punching insulating bar; 13, side fixed insulation plate; 14, grow the clavate valve body; 15, go up metallic sheath; 16, go up conductive adhesive; 17, following conductive adhesive; 18, following metallic sheath; 19, go up binding post; 20, following binding post; 21, insulator; 22, gap metal flange;
Embodiment
A kind of composite sheath formula lightning arrester, comprise composite sheath 5, be fixedly arranged at valve body in the inner chamber of described composite sheath 5, be fixed on the upper end of described valve body last metal electrode, be fixed on the following metal electrode of the bottom of described valve body, described valve body is the long clavate valve body 14 of cylinder formula, and the thickness H of described long bar type valve body 14 and the ratio of diameter D are greater than 2.Described upward metal electrode reaches down, and metal electrode all is fixedly connected by the upper and lower end parts of conductive adhesive with long clavate valve body 14.The internal chamber wall of described composite sheath 5 directly is connected to one with the external peripheral surface of long clavate valve body 14.Described upward metal electrode is the last metallic sheath 15 that is enclosed within long clavate valve body 14 upper ends, and described metal electrode down is the following metallic sheath 18 that is enclosed within long clavate valve body 14 bottoms.
Introduce long excellent type valve body manufacture method earlier:
First method is an isostatic pressing method:
But the valve block raw material is placed on behind mist projection granulating in the long strip type rubber sleeve (or by other composite material making) that seals after the exhaust, and several rubber sleeves are placed in the high-pressure bottle of a full of liquid.Pressurize in container with a high-pressure pump.Because liquid transmits pressure uniformly from the four sides of rubber sleeve, not as having only unidirectional or two-way pressurization in mould with hydraulic press, so the density at each position of moulding rear valve body is uniform.
Second method is the vacuum extrusion molding:
The valve block raw material is placed on behind mist projection granulating in the airtight container and vacuumizes while stirring, when vacuum degree is extracted into when requiring, is in the mould of D at the closed container interior diameter, the limit automated packing, and the limit vibrations, the limit pressurization is extruded after the height H that reaches regulation.Turn over a station then, suppress next valve body.Valve body after the moulding is on thickness direction, and the density at each position is uniform.
With the valve body of above-mentioned two kinds of method moulding, suppress unrestricted highly in theory.Mainly be subjected to the restriction of the compacting cavity volume of former.The valve body of compacting is an example with D=35 at present, and its H/D can reach more than 8.
By growing the polymeric housed metal oxide arrester structure that excellent type valve body constitutes:
Embodiment one
Referring to accompanying drawing 10, long excellent type valve body 14 is after burning till, and two is coated with silver and forms electrode when heat treatment.Electrical measurement is qualified, with conductive adhesive two metal flanges (promptly going up metallic sheath 15 and following metallic sheath 18) on two mucilage binding of long excellent type valve body 14.Be coated with coupling molecule on long excellent type valve body 14 and metal flange, the composite sheath 5 of weather is gone up in sulfuration then, constitutes gapless polymeric housed metal oxide arrester thus.Long excellent type valve body 14 bears the various natural forces that lightning arrester should bear by metal flange.Its these characteristics make its requirement that not only can work as lightning arrester but also satisfy post insulator, can make insulator lightning arrester or pillar lightning arrester (see figure 10) thus.
Referring to accompanying drawing 12, long excellent type valve body 14 is after burning till, and two is coated with silver and forms electrode.After electrical measurement is qualified, with two metal flanges (promptly going up metallic sheath 15, following metallic sheath 18) on the mucilage binding of conductive adhesive two.Top mucilage binding the preceding paragraph of last metallic sheath 15 and the isodiametric insulator 21 of valve body.The metal flange at insulator 21 two ends constitutes the gap of a discharge.Be coated with coupling molecule on valve body and flange, the composite sheath 5 of weather is gone up in sulfuration then.Constitute gapped polymeric housed metal oxide arrester thus.Long excellent type valve body 14 and insulator 21 bear the various natural forces that lightning arrester should bear by flange.
Traditional valve block side scribbles the thick organic insulation glaze in the 0.5mm left and right sides, and the glaze layer is nonelastic, does not match with the coefficient of expansion of valve block, and under the high temperature action of strong lightning current, the air gap defective appears in glaze layer and valve block side, causes valve block side flashover; The polymeric housed metal oxide arrester that also has, the insulating material support is used in valve block stack back, and coupling was associated in when the composite sheath material vulcanized with insulating material.Accomplish that no air gap is impossible between valve block and the insulating material, and air gap is arranged, just exist the possibility of electric puncture and partial discharge.
The outer directly sulfuration of valve body is gone up composite sheath and is made side insulation, and composite sheath directly is associated in by the chemical bond coupling when the sulfidization molding with valve body, does not have any air gap between the two.Composite sheath has excellent elasticity, can be fit to the coefficient of expansion of valve body under various stern climate conditions such as high temperature and low temperature, and make its interface not have any air gap defective.The composite sheath material of valve body side has 3-5mm thickness usually, wants thick many compared with original insulation glaze layer.Therefore composite material in the outer directly sulfuration of valve body has been strengthened the side of valve body insulation greatly, the ability of anti-edge flashing when particularly releasing strong lightning current.
Long excellent type valve body remains electric parameter combo and the electric property spot check test problem of how solving aborning.Electric parameter combo: after long excellent type valve body two ends are coated with silver, the size of the electric parameter of the length decision valve body between two silver electrodes, after so long excellent type valve body burns out, can make sample earlier, to determine the length of same product batch number two ends of valve body silver electrode, and then the size of the electric parameter of definite long excellent type valve body, to be fit to the electric parameter requirement of lightning arrester.
The electric property spot check test: the more original valve block of long excellent type valve body is long, existing electric property spot check test equipment can not meet the demands, can press the existing sampling prescription of valve block, the sample of extraction before long excellent type valve body is fired, be sawn into the valve block that is fit to the electric property spot check test with hacksaw, fire back making electrode and test; Or the sample of extraction after long excellent type valve body is fired, be sawn into the valve block that is fit to the electric property spot check test with diamond blade, make electrode and test.So available existing electric property spot check test equipment carries out spot check test to long excellent type valve body fully.
Claims (4)
1, a kind of composite sheath formula lightning arrester, comprise composite sheath [5], be fixedly arranged at valve body in the inner chamber of described composite sheath [5], be fixed on the upper end of described valve body last metal electrode, be fixed on the following metal electrode of the bottom of described valve body, it is characterized in that: described valve body is the long clavate valve body [14] of cylinder formula, and the thickness H of described long bar type valve body [14] and the ratio of diameter D are greater than 2.
2, composite sheath formula lightning arrester according to claim 1 is characterized in that: described go up metal electrode and down metal electrode all be fixedly connected by the upper and lower end parts of conductive adhesive with long clavate valve body [14].
3, composite sheath formula lightning arrester according to claim 1 is characterized in that: the internal chamber wall of described composite sheath [5] directly is connected to one with the external peripheral surface of long clavate valve body [14].
4, composite sheath formula lightning arrester according to claim 1, it is characterized in that: the described metal electrode of going up is for being enclosed within the last metallic sheath [15] of long clavate valve body [14] upper end, and described metal electrode down is for being enclosed within the following metallic sheath [18] of long clavate valve body [14] bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA03113310XA CN1540685A (en) | 2003-04-23 | 2003-04-23 | Composite housing type lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA03113310XA CN1540685A (en) | 2003-04-23 | 2003-04-23 | Composite housing type lightning arrester |
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| Publication Number | Publication Date |
|---|---|
| CN1540685A true CN1540685A (en) | 2004-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA03113310XA Pending CN1540685A (en) | 2003-04-23 | 2003-04-23 | Composite housing type lightning arrester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267211A (en) * | 2011-07-29 | 2011-12-07 | 镇江巨能电气有限公司 | Die for manufacturing full-closed lightning arrester |
| CN103563013A (en) * | 2011-05-27 | 2014-02-05 | Abb技术有限公司 | Electric component for a high-voltage system |
| CN103730216A (en) * | 2014-01-16 | 2014-04-16 | 国家电网公司 | 10KV wiring circuit lightning protection device |
| CN114613563A (en) * | 2020-12-08 | 2022-06-10 | 西安西电避雷器有限责任公司 | Lightning arrester and processing method thereof |
-
2003
- 2003-04-23 CN CNA03113310XA patent/CN1540685A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103563013A (en) * | 2011-05-27 | 2014-02-05 | Abb技术有限公司 | Electric component for a high-voltage system |
| CN102267211A (en) * | 2011-07-29 | 2011-12-07 | 镇江巨能电气有限公司 | Die for manufacturing full-closed lightning arrester |
| CN102267211B (en) * | 2011-07-29 | 2014-10-01 | 镇江巨能电气有限公司 | Die for manufacturing full-closed lightning arrester |
| CN103730216A (en) * | 2014-01-16 | 2014-04-16 | 国家电网公司 | 10KV wiring circuit lightning protection device |
| CN114613563A (en) * | 2020-12-08 | 2022-06-10 | 西安西电避雷器有限责任公司 | Lightning arrester and processing method thereof |
| WO2022121885A1 (en) * | 2020-12-08 | 2022-06-16 | 西安西电避雷器有限责任公司 | Lightning arrester and processing method therefor |
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