CN102231310B - Bar-shaped composite insulator for electronic railway connecting net plane - Google Patents
Bar-shaped composite insulator for electronic railway connecting net plane Download PDFInfo
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Abstract
The invention discloses a bar-shaped composite insulator used for electric railway contact system comprising a core bar, fittings arranged at two ends of the core bar and sheaths with an umbrella skirt structure; the sheaths are covered on the core bar externally; fittings at compression joint positions of the fittings and the sheaths are internally provided with two annular grooves respectively; the upper dip angle of the umbrella skirt structure is 8 degrees and the lower dip angle of the umbrella skirt structure is 0 degree; the umbrella structure comprises large umbrellas with the same diameter and two small umbrellas with the same diameter between every two adjacent large umbrellas, or large umbrellas with the same diameter and one umbrella with the same diameter between every two adjacent large umbrellas, wherein the large umbrellas are coaxially arranged with the core bar; and umbrella spacing, extension ratio of the umbrellas and umbrella extension are designed reasonably so as to optimize the umbrella structure, thereby reaching the optimal pollution flashover property. The annular grooves are arranged inside the fittings at the compression joint positions of the fittings and the sheaths, thus the grooves are full of the compressed sheaths, thereby realizing the high-intensity sealing and preventing the composite insulator from breaking in use.
Description
Technical field
The present invention relates to electrification railway contact net and use the composite insulator field, the clavate composite insulator that especially a kind of speed per hour is used in the electrification railway contact net of 350km/h.
Background technology
Composite insulator is compared porcelain insulator because of it and is had an enormous advantage and receive the favor of industry at aspects such as weight, null value, pollution flashover voltages, especially high these characteristics of pollution flashover voltage.Discover, have certain relation between the umbrella skirt construction of composite insulator and the pollution flashover voltage, make that other conditions are identical but its pollution flashover voltage of composite insulator that umbrella skirt construction is different is different.Isometrical umbrella structure is unfavorable for suppressing electric arc bridge joint between umbrella that continuous moisture film and current cause, so its overall performance is relatively poor.The umbrella footpath is following to the influence of composite insulator pollution flashover characteristic: umbrella directly strengthens, and then the equivalent diameter of composite insulator increases, and the pollution flashover characteristic is had negative influence; Though the corresponding increase of the creepage distance of composite insulator; Can improve pollution flashover voltage to a certain extent, but the degree that improves is limited, causes the utilance of creepage distance to reduce relatively on the contrary; And excessive umbrella footpath can consume too much material, does not have economic benefit; Therefore the too small deficiency that then can cause leakage distance in umbrella footpath selects the First Principles in umbrella footpath to be, is guaranteeing that whole insulator satisfies the umbrella footpath of selecting to have economic benefit under the prerequisite of leakage distance.The umbrella spacing is following to the influence of composite insulator pollution flashover characteristic: the umbrella spacing increases, and at first can improve the long-pending dirty characteristic of composite insulator; Secondly, can suppress bridge joint between umbrella effectively, prevent the serial connection of serious icing snowberg and retardance electric arc; The 3rd, can promote the utilance of creepage distance; But the prerequisite that increases is to guarantee that whole composite insulator has sufficient creepage distance.The umbrella spacing reduces, and under the certain situation of insulation height, can improve the creepage distance of composite insulator, but pollution flashover voltage linear growth not with the increase of creepage distance, the umbrella spacing is too small, and bridge joint takes place between umbrella easily, and the utilance of creepage distance reduces relatively.
According to incompletely statistics, the insulator brittle failure accident that domestic electric power system takes place has reached a lot of, and brittle failure often occurs in the high-pressure side that the composite insulator field intensity is concentrated, and the composite insulator that the brittle failure accident takes place generally all exists sheath, the damaged situation of end seal.It is generally acknowledged: the probability that brittle failure takes place is very little, can't prevent, and can't detect very harmful to contact line.So the quality of composite insulator end seal designing quality and the quality of processing quality are to stop the key of composite insulator generation brittle failure accident.
In addition, composite insulator is at the contact online operation, with the long term that receives dynamo-electric load; The mechanical strength of composite insulator is passed in time and is reduced; The main cause that causes this phenomenon is that mandrel material itself has creep properties, if the crimping parameter designing is unreasonable in the process of crimping simultaneously, causes the crimp area stress between gold utensil and the plug too concentrated; Under the effect of long-term dynamo-electric load, composite insulator mechanical strength decrease speed can be accelerated.In the GB/T 19519 appendix A composite insulator mechanical stretching load-time test principle, with composite insulator intensity-time graph the creep decay of composite insulator is stipulated: the attenuation curve slope must not surpass 8%.Be the crimping parameter of guaranteeing the Mechanical Reliability of composite insulator product, must find out to satisfy condition.
Summary of the invention
The technical problem that the present invention will solve provides electrification railway contact net and uses the clavate composite insulator, makes its pollution flashover voltage high, and in use prevents brittle failure.
For solving the problems of the technologies described above; The technical scheme that the present invention taked is: electrification railway contact net is used the clavate composite insulator; Comprise the gold utensil of plug, the setting of plug two ends and the sheath that has umbrella skirt construction that mandrel outer covers, on the gold utensil inwall at said gold utensil and sheath interface position, be provided with the bipassage ring connected in star; The top rade of said umbrella skirt construction is 8 °, and angle of declination is 0 °.
Said clavate composite insulator is divided into two kinds of forms: composite rod insulator and clavate post composite insulators.
The umbrella skirt construction of said composite rod insulator can be divided into two kinds: a kind of umbrella skirt construction for the gamp of the equal diameters of the coaxial setting of plug and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 90mm～120mm; It is 1.35～1.40 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 55mm～60mm; Another kind of umbrella skirt construction is and the gamp of the equal diameters of the coaxial setting of plug and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～60mm; It is 1.60～1.85 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 32mm～40mm.
The umbrella skirt construction of said clavate post composite insulators can be divided into two kinds: a kind of umbrella skirt construction for the gamp of the equal diameters of the coaxial setting of plug and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 80mm～90mm; It is 1.40～1.45 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm; Another kind of umbrella skirt construction is and the gamp of the equal diameters of the coaxial setting of plug and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～55mm; It is 2.0 ± 0.1 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm.
Beneficial effect of the present invention is following:
(1) through umbrella is stretched out, umbrella stretch out than and the reasonable setting of umbrella spacing, reach the best effect of composite insulator pollution flashover characteristic;
(2) through on the gold utensil inwall at composite insulator gold utensil and sheath crimping position, the bipassage ring connected in star being set; Sheath is full of groove after the crimping; Play the effect of two " O " shape sealing rings; The interaction of the plastic deformation of crimping armor clamp and the strain of silicone rubber jacket realizes high-intensity sealing, prevents that composite insulator from the brittle failure accident in use taking place.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Fig. 1 is the embodiment of the invention one a composite rod insulator structural representation;
Fig. 2 is the partial enlarged drawing of Fig. 1 at the A place;
Fig. 3 is the embodiment of the invention two composite rod insulator structural representations;
Fig. 4 is the embodiment of the invention three clavate post composite insulators structural representations;
Fig. 5 is the partial enlarged drawing of Fig. 4 at the B place;
Fig. 6 is the embodiment of the invention four clavate post composite insulators structural representations.
Wherein, 1, plug, 2, gold utensil, 3, umbrella skirt construction, 4, sheath, 5, annular groove.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed explanation.
Embodiment one
Like Fig. 1, shown in Figure 2; Electrification railway contact net of the present invention uses the clavate composite insulator to be suspension type clavate composite insulator; Comprise gold utensil 2 and the plug 1 outer sheath that has umbrella skirt construction 34 that covers that plug 1, plug two ends are provided with, on gold utensil 2 inwalls at said gold utensil 2 and sheath 4 interface positions, be provided with bipassage ring connected in star 5; The top rade of said umbrella skirt construction 3 is 8 °, and angle of declination is 0 °; Wherein umbrella skirt construction 3 is and the gamp of the equal diameters of plug 1 coaxial setting and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 90mm～120mm; It is 1.35～1.40 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 55mm～60mm.
Embodiment two
As shown in Figure 3; Electrification railway contact net of the present invention uses the clavate composite insulator to be suspension type clavate composite insulator; Comprise gold utensil 2 and the plug 1 outer sheath that has umbrella skirt construction 34 that covers that plug 1, plug two ends are provided with, on gold utensil 2 inwalls at said gold utensil 2 and sheath 4 interface positions, be provided with bipassage ring connected in star 5; The top rade of said umbrella skirt construction 3 is 8 °, and angle of declination is 0 °; Wherein umbrella skirt construction 3 is and the gamp of the equal diameters of plug 1 coaxial setting and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～60mm; It is 1.60～1.85 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 32mm～40mm.
Embodiment three
Like Fig. 4, shown in Figure 5; Electrification railway contact net of the present invention uses the clavate composite insulator to be suspension type clavate composite insulator; Comprise gold utensil 2 and the plug 1 outer sheath that has umbrella skirt construction 34 that covers that plug 1, plug two ends are provided with, on gold utensil 2 inwalls at said gold utensil 2 and sheath 4 interface positions, be provided with bipassage ring connected in star 5; The top rade of said umbrella skirt construction 3 is 8 °, and angle of declination is 0 °; Wherein umbrella skirt construction 3 is and the gamp of the equal diameters of plug 1 coaxial setting and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 80mm～90mm; It is 1.40～1.45 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm.
Embodiment four
As shown in Figure 6; Electrification railway contact net of the present invention uses the clavate composite insulator to be suspension type clavate composite insulator; Comprise gold utensil 2 and the plug 1 outer sheath that has umbrella skirt construction 34 that covers that plug 1, plug two ends are provided with, on gold utensil 2 inwalls at said gold utensil 2 and sheath 4 interface positions, be provided with bipassage ring connected in star 5; The top rade of said umbrella skirt construction 3 is 8 °, and angle of declination is 0 °; Wherein umbrella skirt construction 3 is and the gamp of the equal diameters of plug 1 coaxial setting and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～55mm; It is 2.0 ± 0.1 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm.
The above-mentioned parameter umbrella stretches out the radial distance that refers between composite insulator full skirt outer and the sheath.
Table 1 electrification railway contact net is with the umbrella skirt construction of the various different products of clavate composite insulator
From table 1, can find out, at 0.3mg/cm
2Under the extremely heavy close condition of salt, the pollution flashover voltage of composite insulator exceeds 26%～60% than working voltage.It is thus clear that through the umbrella skirt construction of optimized choice, the anti-pollution characteristic of composite insulator is good, can satisfy service requirement fully.
In addition, electrification railway contact net of the present invention adopts new crimping hermetically-sealed construction, gold utensil seam position seal area with the clavate composite insulator; Projected depth is 10mm, on the gold utensil inwall at said gold utensil and sheath interface position, is provided with the bipassage ring connected in star, and sheath is full of groove after the crimping; Play the effect of two " O " shape sealing rings; The interaction of the plastic deformation of crimping armor clamp and the strain of silicone rubber jacket realizes high-intensity sealing, also uses fluid sealant simultaneously; Make itself and sheath form an integral body, prevent that effectively composite insulator from the brittle failure accident in use taking place.
Electrification railway contact net of the present invention is contacting online operation with the clavate composite insulator; With the long term that receives dynamo-electric load, the mechanical strength of composite insulator is passed in time and is reduced, and the main cause that causes this phenomenon is that mandrel material itself has creep properties; If parameter designing is unreasonable in the process of crimping simultaneously; Cause the crimp area stress between gold utensil and the plug too concentrated, under the long-term load effect, the insulator mechanical strength decrease speed can be accelerated.With insulator strength-time graph the creep decay of composite insulator is stipulated in the GB/T 19519 appendix A composite insulator mechanical stretching load-time test principle: the attenuation curve slope must not surpass 8%.For guaranteeing the Mechanical Reliability of composite insulator product; The present invention strives dropping to 4% to the creep characteristic curve slope of composite insulator; Make the different corresponding insulator strength-time graph slopes of end gold utensil crimp strength through a large amount of tests, and find out-the time graph slope is 4% o'clock corresponding crimping parameter.
The mechanical strength of composite insulator can be made through 3 time point failure tests with the logarithmic relationship slope of a curve of load application time: 1min on average destroys load, 24h and on average destroys load, 96h and on average destroy load.1min destroys to load and is easy to record in the process of the test, and the destruction load of 24h and 96h then is difficult for recording.Therefore the destruction load of 24h and 96h is made and changed; Promptly change the destruction load test of 24h and 96h into 24h and 96h resistance test; As long as composite insulator can be crossed tolerance 0.74Mav and 0.73Mav (slope of a curve be no more than per time logarithmic scale 4%) 24h and 96h; So just think that the creep characteristic curve slope is 4% to the maximum, the composite insulator product has higher Mechanical Reliability.
1min destroys load test: adopt 3 same compound insulators to destroy load test, obtain average destruction value Mav and standard deviation б.Be not less than 10 according to international experience when testing number, can calculate more accurate standard deviation б as test data, if the test number is 3, then the standard deviation б as test data gets 0.08Mav.
24h and 96h resistance test: the resistance test for 24h still adopts 3 composite insulators; Requirement according to creep characteristic curve slope 4%; Draw the corresponding constantly destruction load value M24 of 24h logarithm; As long as composite insulator can bear the tensile load 24h of M24, just can think that the creep characteristic curve slope of composite insulator is at least 4%.
T24=Lg（24×60）=3.16
M24=（1-3.16×0.04）Mav=0.87Mav
According to the Gaussian distribution principle, 3 composite insulators are that 90% 24h resistance test load is through probability:
0.87Mav（1-1.82×0.08）=0.74Mav
For the 96h resistance test, in like manner can draw 3 composite insulator percent of pass and be 90% 96h resistance test load and be:
T96=Lg（96×60）=3.76
M24=（1-3.76×0.04）Mav=0.85Mav
0.85Mav（1-1.82×0.08）=0.73Mav
Be the creep characteristic curve of 4% composite insulator to the maximum through these three somes slope that just can draw, and the end gold utensil crimping parameter of the composite insulator of corresponding this curve is exactly desirable crimping parameter.
Under the crimping parameter of 4% attenuation slope, the 24h resistance test that 3 same compound insulators carry out 1.2SML is produced in crimping:
24h time logarithmic scale is:
T24=Lg（24×60）=3.16
50 year logarithmic scales are:
T24=Lg（50×365×24×60）=7.42
If the tolerance 1.2SML of 24h, then with 4% attenuation slope, the mechanical load of composite insulator product is after 50 years:
1.2SML[1-(7.42-3.16)?×0.04]=1SML
Can know that with 4% attenuation slope the composite insulator product also has the tensile load value of specified mechanical load at least after 50 years.
1.2SML behind the tolerance 24h, product is carried out the mechanical stretching failure test, can verify.
Electrification railway contact net according to the method, is confirmed crimping parameter by model with clavate composite insulator product.
In sum, electrification railway contact net of the present invention with the clavate composite insulator through umbrella is stretched out, umbrella stretch out than and the reasonable setting of umbrella spacing, reach the best effect of composite insulator pollution flashover characteristic; Through on the gold utensil inwall at composite insulator gold utensil and sheath crimping position, the bipassage ring connected in star being set; Sheath is full of groove after the crimping, plays the effect of two " O " shape sealing rings, the interaction of the plastic deformation of crimping armor clamp and the strain of silicone rubber jacket; Realize high-intensity sealing; Also use fluid sealant simultaneously, make itself and sheath form an integral body, prevent that effectively composite insulator from the brittle failure accident in use taking place; And confirm the crimping parameter of gold utensil to make it satisfy the requirement of creep characteristic curve slope through a kind of round-about way.
Claims (4)
1. clavate composite insulator; Comprise gold utensil (2) and the outer sheath that has umbrella skirt construction (3) (4) that covers of plug (1) that plug (1), plug two ends are provided with, it is characterized in that: on gold utensil (2) inwall at said gold utensil (2) and sheath (4) interface position, be provided with bipassage ring connected in star (5); The top rade of said umbrella skirt construction (3) is 8 °, and angle of declination is 0 °; Said clavate composite insulator is a composite rod insulator; And umbrella skirt construction (3) is and the gamp of the equal diameters of the coaxial setting of plug (1) and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 90mm～120mm; It is 1.35～1.40 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 55mm～60mm.
2. clavate composite insulator; Comprise gold utensil (2) and the outer sheath that has umbrella skirt construction (3) (4) that covers of plug (1) that plug (1), plug two ends are provided with, it is characterized in that: on gold utensil (2) inwall at said gold utensil (2) and sheath (4) interface position, be provided with bipassage ring connected in star (5); The top rade of said umbrella skirt construction (3) is 8 °, and angle of declination is 0 °; Said clavate composite insulator is a composite rod insulator; And umbrella skirt construction (3) is and the gamp of the equal diameters of the coaxial setting of plug (1) and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～60mm; It is 1.60～1.85 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 32mm～40mm.
3. clavate composite insulator; Comprise gold utensil (2) and the outer sheath that has umbrella skirt construction (3) (4) that covers of plug (1) that plug (1), plug two ends are provided with, it is characterized in that: on gold utensil (2) inwall at said gold utensil (2) and sheath (4) interface position, be provided with bipassage ring connected in star (5); The top rade of said umbrella skirt construction (3) is 8 °, and angle of declination is 0 °; Said clavate composite insulator is the clavate post composite insulators; And umbrella skirt construction (3) is and the gamp of the equal diameters of the coaxial setting of plug (1) and two umbellules of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 80mm～90mm; It is 1.40～1.45 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm.
4. clavate composite insulator; Comprise gold utensil (2) and the outer sheath that has umbrella skirt construction (3) (4) that covers of plug (1) that plug (1), plug two ends are provided with, it is characterized in that: on gold utensil (2) inwall at said gold utensil (2) and sheath (4) interface position, be provided with bipassage ring connected in star (5); The top rade of said umbrella skirt construction (3) is 8 °, and angle of declination is 0 °; Said clavate composite insulator is the clavate post composite insulators; And umbrella skirt construction (3) is and the gamp of the equal diameters of the coaxial setting of plug (1) and a umbellule of the equal diameters between every adjacent gamp; Adjacent two gamp spacings are 50mm～55mm; It is 2.0 ± 0.1 that the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella, and the gamp umbrella stretches out and is 50mm～55mm.
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| CN103123832B (en) * | 2013-02-04 | 2016-02-24 | 中国电力科学研究院 | A kind of ultra-high/extra-high voltage exchanges umbrella structure of composite insulator |
| CN109946297A (en) * | 2019-03-21 | 2019-06-28 | 国网湖南省电力有限公司 | Bar-shaped composite insulator visual examination platform and method |
| CN111968806A (en) * | 2020-07-30 | 2020-11-20 | 江西利华电瓷制造有限公司 | Electroceramic device capable of adjusting installation size of electroceramic insulator |
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| CN102063972A (en) * | 2007-12-21 | 2011-05-18 | 中国南方电网有限责任公司电网技术研究中心 | Stain discharge characteristic-based direct current suspended composite insulator umbrella skirt structure |
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| CN1925068A (en) * | 2006-03-03 | 2007-03-07 | 东莞市高能实业有限公司 | Synthesized insulator for ultra-high voltage AC transmission circuit |
| CN101369476A (en) * | 2007-12-21 | 2009-02-18 | 清华大学深圳研究生院 | DC suspension type composite insulator umbrella skirt structure based on contaminated discharge property |
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Address after: 062550 Renqiu province Hebei city lvgongbao Industrial Zone (Jin Qiao) Patentee after: HEBEI XINHUA HIGH VOLTAGE ELECTRICAL EQUIPMENT CO., LTD. Patentee after: Beihinghong Electrical Equipments Co.,Ltd. Address before: 062550 Cangzhou city of Hebei province Renqiu lugongpu Industrial Zone (Jin Qiao) Patentee before: Hebei Xinhua High Voltage Electrical Equipment Co., Ltd. Patentee before: Beihinghong Electrical Equipments Co.,Ltd. |
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Effective date of registration: 20160824 Address after: Golden Bridge Industrial Zone 062550 Cangzhou city of Hebei province Renqiu lugongpu Patentee after: HEBEI XINHUA HIGH VOLTAGE ELECTRICAL EQUIPMENT CO., LTD. Address before: 062550 Renqiu province Hebei city lvgongbao Industrial Zone (Jin Qiao) Patentee before: HEBEI XINHUA HIGH VOLTAGE ELECTRICAL EQUIPMENT CO., LTD. Patentee before: Beihinghong Electrical Equipments Co.,Ltd. |
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Effective date of registration: 20180626 Address after: 062350 eastern part of Zhengyang Road, Suning Town, Suning City, Hebei Patentee after: Hebei RongSen Electrical Co., Ltd. Address before: 062550 Cangzhou City, Hebei province Renqiu City Lu Gong Bao Jinqiao Industrial Zone Patentee before: HEBEI XINHUA HIGH VOLTAGE ELECTRICAL EQUIPMENT CO., LTD. |