CN101615454A - Combined insulator string - Google Patents
Combined insulator string Download PDFInfo
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- CN101615454A CN101615454A CN200910098416A CN200910098416A CN101615454A CN 101615454 A CN101615454 A CN 101615454A CN 200910098416 A CN200910098416 A CN 200910098416A CN 200910098416 A CN200910098416 A CN 200910098416A CN 101615454 A CN101615454 A CN 101615454A
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Abstract
The invention discloses a kind of combined insulator string, comprise the composite rod insulator of main part, it is characterized in that on described shape suspended compound insulator, being provided with the dish-type glass insulator in the lead side at least.Lead side panel type glass insulation quantum count is 1-6, preferred 4-6.Combined insulator string of the present invention, have the advantage of plate-shaped suspension type insulator string and composite rod insulator concurrently, promptly has very high anti-pollution characteristic, can bear very high puncture voltage, good electric erosion resistance energy, radio interference level is low, leakage current is little, anti-thunder performance is strong, zero resistance insulator may occur operation of power networks has been caused very big influence thereby overcome simultaneously independent employing dish-type porcelain suspension insulator again, perhaps adopt the antifouling ability of dish-type glass suspension insulator separately, perhaps adopt the defective of composite rod insulator poor-performing of anti-thunder the etc. separately.
Description
Technical field
The present invention relates to insulator string, specifically a kind of combined insulator string.
Background technology
Insulator string according to the definition of GB GB/T 2900.8-1995 " electrotechnical terminology insulator " is: the device of using for the electric equipment that is in different potentials or conductor electric insulation and mechanical fixation.Connect popular wording, insulator string be with wire insulation fix and be suspended in object on the shaft tower.Its effect is: one, insulating pole tower body and lead, so the insulation property of insulator (also being electric property) are very important; Two, fixing cord, so the mechanical performance of insulator and ageing resistace also are very important.
Line insulator is by the material difference, the most frequently used three kinds of the branches that can be: dish-type porcelain suspension insulator, dish-type glass suspension insulator, clavate silicon rubber suspended compound insulator.
The dish-type porcelain suspension insulator that uses electrotechnical ceramics to make as insulating material, it belongs to inorganic material, and its main composition generally includes polysilicon hydrochlorate, aluminosilicate, admire hydrochlorate or oxide.With reference to Fig. 1, dish-type porcelain suspension insulator by 1, chapeau de fer 2, steel pin 3, porcelain umbrella disk insulating part 4, be integral with high-mark cement adhesive mucilage binding.A plurality of dish-type porcelain suspension insulator 1 stacked formation insulator strings (as shown in Figure 2).It has advantages such as performance, thermal endurance and the assembling of good insulation performance performance, anti-climate change be flexible, but also has shortcoming:
A, because the thermal expansion coefficient difference of a disc type porcelain insulator steel cap steel pin, porcelain spare and cement is bigger, descend in the effect that the sunlight of long-term electric field, mechanical stress and the Nature, wind, rain, snow, mist etc. corrode, progressively impel its intensity decreases or produce latent crackle, cause deterioration, for can puncture type product, our said null value just, insulator string exists low null value porcelain insulator to bring threat to the safe operation of electrical network.
B, when fault current passes through from containing the deterioration insulator string, because the porcelain umbrella disk of low zero resistance insulator still exists, cause short circuit current between steel cap, steel pin, to pass through, the insulator head moment high-temperature evaporation of latent crackle in the steel cap is expanded and burst the steel cap, cause lead to land accident.East China Power Grid is in the big pollution flashover accident in the end of the year 1996, and the 500kV system has 11 circuits to give birth to 72 tripping operations because of the mist shwoot.Wherein, 3 circuits cause lead to land because of the zero resistance insulator blast; Article 2,1 string is arranged in many insulator strings of circuit structure because of the disconnected string of zero resistance insulator blast.
C, since China do not adopt metal arcing horn unit protection porcelain insulator string; in string, there is low zero resistance insulator and will inevitably in line fault, bursts the serious accident that the initiation lead falls string; therefore DL/T 741 " aerial power transmission line operating standard " regulation every two years detects the work of deterioration porcelain insulator; cause circuit operation maintenance workload big; particularly superhigh pressure or extra high voltage line; insulator quantity is multiplied; and strain insulator string can only adopt the low zero resistance insulator of the detection that has a power failure, and equipment availability is descended.
D, porcelain insulator belong to the product that deterioration year by year increases progressively, and promptly the deterioration rate is higher, and the annual aging characteristic aggregate level is about about 0.2%, and the product differentiation of different manufacturers is bigger.In numerous insulator strings, as long as have a slice deterioration insulator in certain string, when suffering fault trip accident such as thunderbolt, pollution flashover or bird pest, insulator all can take place burst lead and fall the string accident.
The dish-type toughened glass suspension insulator that adopts the soda-lime-silica glass formula materials to make, belong to the inorganic material class, after glass workpiece is handled through tempering, its tensile strength is 88.26Mpa, be 2.2 times (porcelain 39.23Mpa) of ceramic material, its anti-electrical breakdown performance is 1350～1750kV/cm, waveform 1/50us, is 3.4～4.3 times (porcelain 400kV/cm) of ceramic material, can satisfy the requirement of insulator to mechanical performance, cold and hot performance and electrical insulation capability fully.External laboratory was once repeatedly done the overbump test to the glass insulation substring with steep wave, and its result is the atmosphere flashover, and the puncture situation of glass workpiece never takes place.Beijing power construction research institute is carrying out tired twice contrast test (each fixes two ends with porcelain insulator string and glass insulation substring) of vibrating 1,500 ten thousand times to lead, the dynamo-electric breakdown strength of the glass insulator of result of the test: 60kN, 160kN does not descend, and the dynamo-electric breakdown strength of identical porcelain insulator descends 19% and 17% respectively, therefrom draw the strong shock resistance of glass insulator, evidence: the breakdown strength of toughened glass under the surge voltage effect is 3.8 times of porcelain insulator.
The dish-type glass insulator also is to adopt the high-mark cement mucilage binding to be integral equally by chapeau de fer, steel pin and glass insulation spare.Its structure is identical with porcelain insulator shown in Figure 1.The stacked formation insulator string of a plurality of dish-type glass insulators.Its advantage is:
A, have electromechanical properties preferably, its tensile strength, anti-electrical breakdown performance, vibration resistance fatigue, anti-electric arc burn and cold-resistant thermal shock resistance properties etc. all are better than porcelain insulator.
The insulation oneself that B, different with porcelain insulator, glass insulator have the null value self-destruction eliminates ability, and this is very easy to find run unit, need not that it is stepped on tower and carries out Insulation test.
C, toughened glass insulator belongs to early stage deterioration exposing product, be subjected to electric after putting into operation, electric stress and the Nature wind such as machinery, rain, effect such as thunder and lightning down, there is impurity in the glass workpiece, insulators such as tempering flaw, umbrella disk self-destruction phenomenon can take place, the self-destruction rate descends year by year with the increase of running time, and because of the residual strength after its self-destruction reaches 80% specified mechanical load, steel cap after short circuit current during if break down bursts from umbrella disk, pass through between the steel pin, the electric current that therefore can not be short-circuited bursts lead and falls the string accident by the deterioration insulator steel cap takes place in the steel cap.Because the special producing technology of toughened glass insulator, the insulator head of its equal mechanical load can be made point, cause glass insulator more in light weight, can alleviate the iron tower load behind the group string, reduce the building cost of transmission line than the porcelain insulator of equal mechanical load.Glass insulator belongs to the disposal molding product in addition, and mechanization production efficiency height simultaneously can be produced big disk track large distance plain edition insulator, makes that it washes away, decontamination function is more excellent than porcelain insulator.The electric capacity of glass insulator about 100
PF (porcelain insulator about 60
PF), its dielectric coefficient is 1.2-1.6 a times of porcelain, insulator spread voltage behind the group string is than porcelain insulator string more even (the insulator string spread voltage evenly depends on the main capacitance of insulator), this helps reducing the insulator voltage of lead side, cross-arm side, reduce radio interference and reduced corona loss, prolong the useful life of insulator, also improved the flashover voltage value of glass insulation substring simultaneously.
Its shortcoming is:
The ability of the cold-resistant heat shocks of A, glass insulator is relatively poor, if use at the dirty source point of heavy dust place, humidity greater than 90% situation under, the quick-fried defective of group easily takes place in the glass insulation substring.
Though B dish type glass insulator is more in light weight than porcelain insulator, but weigh, can increase the building cost of iron tower of power transmission line than composite insulator.
At the circuit operation maintenance on the whole, dish-type glass insulator various aspects of performance is much better than the dish-type porcelain insulator, selects reasonably words as if design, run unit, and glass insulator can be born the responsibility of safety, economy, reliability service.
Silicon rubber compound insulator is made by epoxy resin fiberglass plug and silicon rubber, and silicon rubber is by methyl vinyl silicone rubber (rubber), supporting material white carbon, aluminium hydrate powder and fire proofing aluminium hydroxide etc., through high temperature refining glue and sulfuration injection moulding.It belongs to organic material and makes.With reference to Fig. 3, composite rod insulator 5 is to constitute an overall structure by silicon rubber full skirt 7, plug 8 and end gold utensil crimping 9, and each several part is non-dismountable.Diagram is depicted as the composite rod insulator of band grading ring 9.The advantage of composite rod insulator is:
A, because silicon rubber has good hydrophobicity performance, its anti-pollution characteristic height (it is present porcelain or glass pollution proof insulator 2～3 times that dirty wet lightning is pressed);
B, can bear very high puncture voltage;
C, radio interference level are low;
D, leakage current are little;
E, work frequency dry flash voltage are a little more than porcelain or glass dish-type insulator string; Wet lightning is pressed than dish-type insulator string high approximately 15%;
F, for the insulator contamination cleaning works, can realize non-maintaining or few the maintenance.
Its shortcoming is:
A, life of product only are about 1/3 of dish type porcelain, glass insulator;
B, owing to be long excellent type insulator, the spread voltage of its insulator string is extremely inhomogeneous, particularly do not have the manufactured size of grading ring and technology, material requirements in the national standard, not to the electrical test examination criteria of pressure-equalizing device, operating composite insulator all presses effect to determine simultaneously;
C, under equal conditions, the anti-thunder performance of insulator string reduces about 7%～23% than porcelain, glass insulator approximately;
The maintenance work of D, in-service inspection, sampling observation, test is bigger, by DL/T 864-2004 " nominal voltage is higher than 1000V interchange overhead transmission line and uses guide rule with composite insulator " requirement, operating composite insulator is to inspect by random samples by a certain percentage one-period and test by 3-5,8～10 years by a batch replacing send outside the test test that detects;
E, electric, the mechanical performance of pressing composite insulator, the scope of application is less than normal, and product life-cycle operating cost is big;
F, owing to silicon rubber reason (umbrella disk can't be done greatly), under equivalent constructions height situation, the creepage distance of composite insulator can only reach about 2.5cm/kV, if its creepage coefficient is certainly greater than more than 3.5 when surpassing, do not meet standard-required and can be in actual motion because of sacrificial section creep distance behind the arcing bridge joint.
G, according to 50,000 insulator ruuning situations statistics (by the end of the year 1999) more than the our province 110kV, its total rate of failure 0.049%, all lower than dish-type porcelain insulator 0.2368% (falling string rate 0.0056%), dish-type glass insulator 0.1647%, but composite insulator accidents happened generally can cause bigger equipment breakdown.
Summary of the invention
What the present invention will solve is all to have the major defect problem when the insulator string of the various structures of prior art uses separately, silicone rubber jacket galvanic corrosion perforation that solves composite insulator high-pressure side spread voltage severe overweight on superhigh pressure or the extra high voltage line and cause and core brittle fracture fall the serious accident of string, solve and adopt the dish type glass insulator to cause the weightening finish of iron tower load and the big defective of construction cost, secondly solve in heavy pollution area and heavy dust location, adopt the filthy cleaning of insulator string of the glass insulation period of the day from 11 p.m. to 1 a.m can cause the line outage time long, the situation that the cleaning works amount is big.Strong, the in service not zero-detection of anti-electric field ability by adopting glass insulator, do not fall long characteristics of string, life of product and the advantage that composite insulator is in light weight, anti-pollution characteristic is strong, be combined into a kind of insulator string of optimization, overcome their shortcoming and defect separately simultaneously again.
The technical scheme that addresses the above problem employing is: combined insulator string comprises it is characterized in that the composite rod insulator of main part being provided with the dish-type glass insulator in the lead side at least on the described suspended compound insulator.
Lead side panel type glass insulation quantum count is 1-6.Preferred 4-6.
As a further improvement on the present invention, the cross-arm side is provided with the dish-type glass insulator.Cross-arm side panel type glass insulation quantum count is 1-4, preferred 1-2.
Combined insulator string of the present invention, have the advantage of plate-shaped suspension type insulator string and composite rod insulator concurrently, on superhigh pressure or extra high voltage line, use, can significantly alleviate the load that iron tower bears, has very high anti-pollution characteristic again, can bear very high puncture voltage, good electric erosion resistance energy, radio interference level is low, leakage current is little, anti-thunder performance is strong, thereby has overcome simultaneously 1 again, adopts dish-type porcelain suspension insulator to cause the iron tower load to increase separately, zero resistance insulator may occur on electric operation of power networks has been caused very big influence; 2, adopt dish-type glass suspension type pollution proof insulator increase iron tower bearing load and anti-pollution characteristic commonly used at present poor separately; 3, adopt the composite rod insulator poor-performing of anti-thunder the, spread voltage extremely inhomogeneous and easily cause the core brittle fracture lead that silicone rubber jacket galvanic corrosion perforation causes and fall defectives such as string accident separately.Wherein the most outstanding is that the present invention program can be reduced to the spread voltage at the composite insulator high-pressure side first full skirt place below the corona inception voltage, it is more even that its insulator string voltage is distributed, thereby avoid all kinds of security incidents such as composite insulator brittle failure that cause because of galvanic corrosion effectively, improved the service life of the distolateral composite insulator of composite insulator high pressure.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of plate-shaped suspension type insulator.
Fig. 2 is the structural representation of existing plate-shaped suspension type insulator string.
Fig. 3 is existing not with the structural representation of the composite rod insulator string of grading ring.
Fig. 4 is the structural representation of the composite rod insulator string of existing band grading ring.
Fig. 5 is the structural representation of first execution mode of combined insulator string of the present invention, and wherein cross-arm side panel type insulation subnumber is 1, and lead side panel type insulation subnumber is 4.
Fig. 6 is the structural representation of second kind of execution mode of combined insulator string of the present invention, and wherein the cross-arm side is not established the dish-type insulator, and lead side panel type insulation subnumber is 6.
Fig. 7 be combined insulator string of the present invention the third execution mode structural representation wherein cross-arm side panel type insulation subnumber be 2, lead side panel type insulation subnumber is 4.
Fig. 8 be combined insulator string of the present invention the 4th kind of execution mode structural representation wherein cross-arm side panel type insulation subnumber be 1, lead side panel type insulation subnumber is 5.
Embodiment
With reference to Fig. 5, combined insulator string of the present invention, two ends are made up of with composite rod insulator 5 dish type glass insulator 1 and centre.Specifically, at cross-arm side dress a slice 170mm height, Φ 360mm (320mm) disk track, how much creepage dish-type glass insulators 1 of 550mm, the composite insulator 5 that connects the 3450mm structure height of Ding Jiashi again, lead side hang up the dish-type glass insulator 1 of 4 same sizes again.Shoulder the formula wire clamp in the employing.
Fig. 6 is second kind of execution mode of the present invention, and be with the first execution mode difference: wherein the cross-arm side is not established the dish-type insulator, and lead side panel type insulation subnumber is 6.All the other structures are identical with first execution mode.
Fig. 7 is the structural representation of the third execution mode of combined insulator string of the present invention, is with the first execution mode difference: wherein cross-arm side panel type insulation subnumber is 2, and lead side panel type insulation subnumber is 4.All the other structures are identical with first execution mode.
Fig. 8 is the structural representation of the 4th kind of execution mode of combined insulator string of the present invention, is with the first execution mode difference: wherein cross-arm side panel type insulation subnumber is 1, and lead side panel type insulation subnumber is 5.All the other structures are identical with first execution mode.
With above-mentioned second, third, the 4th kind of structure be applied in respectively on the 6 foundation shaft towers and test, survey 18 combined insulators, the cloth of first full skirt of 12 combined insulators in limit punishment as a result magnitude of voltage is between 21kV-25kV, first full skirt punishment cloth magnitude of voltage of going here and there mutually in 6 has obviously reduced the magnitude of voltage that is divided into of high-pressure side between 23kV-27kV.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (6)
1, combined insulator string comprises it is characterized in that the composite rod insulator (5) of main part being provided with dish-type glass insulator (1) in the lead side at least on described shape suspended compound insulator (5).
2, combined insulator string as claimed in claim 1 is characterized in that being that lead side panel type glass insulator (1) quantity is 1-6.
3, combined insulator string as claimed in claim 1 is characterized in that being that lead side panel type glass insulator (1) quantity is 4-6.
4,, it is characterized in that being that the cross-arm side also is provided with dish-type glass insulator (1) as any one described combined insulator string of claim 1-3.
5, combined insulator string as claimed in claim 4 is characterized in that being that cross-arm side panel type glass insulator (1) quantity is 1-4.
6, combined insulator string as claimed in claim 5 is characterized in that being that cross-arm side panel type glass insulator (1) quantity is 1-2.
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| CN200910098416A CN101615454A (en) | 2009-05-07 | 2009-05-07 | Combined insulator string |
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| CN200910098416A CN101615454A (en) | 2009-05-07 | 2009-05-07 | Combined insulator string |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568711A (en) * | 2011-12-29 | 2012-07-11 | 浙江金利华电气股份有限公司 | 90-tonnage disk suspended glass insulator |
| CN104198897A (en) * | 2014-07-30 | 2014-12-10 | 国家电网公司 | Composite insulator interface breakdown fault simulation method |
| CN104252927A (en) * | 2014-10-13 | 2014-12-31 | 国家电网公司 | Combined type strain insulator string with composite insulator of overhead transmission line |
| CN105679472A (en) * | 2016-04-05 | 2016-06-15 | 长葛市恒瑞电瓷电器有限公司 | Novel tempered glass insulator |
| CN108550444A (en) * | 2018-05-25 | 2018-09-18 | 华润电力风能（阳江）有限公司 | Single conductor simply connected suspension insulator |
| CN108766679A (en) * | 2018-05-25 | 2018-11-06 | 华润电力风能（阳江）有限公司 | Single conductor duplex pendency composite insulator |
-
2009
- 2009-05-07 CN CN200910098416A patent/CN101615454A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568711A (en) * | 2011-12-29 | 2012-07-11 | 浙江金利华电气股份有限公司 | 90-tonnage disk suspended glass insulator |
| CN104198897A (en) * | 2014-07-30 | 2014-12-10 | 国家电网公司 | Composite insulator interface breakdown fault simulation method |
| CN104252927A (en) * | 2014-10-13 | 2014-12-31 | 国家电网公司 | Combined type strain insulator string with composite insulator of overhead transmission line |
| CN105679472A (en) * | 2016-04-05 | 2016-06-15 | 长葛市恒瑞电瓷电器有限公司 | Novel tempered glass insulator |
| CN108550444A (en) * | 2018-05-25 | 2018-09-18 | 华润电力风能（阳江）有限公司 | Single conductor simply connected suspension insulator |
| CN108766679A (en) * | 2018-05-25 | 2018-11-06 | 华润电力风能（阳江）有限公司 | Single conductor duplex pendency composite insulator |
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Open date: 20091230 |