CN105161227B - A kind of composite insulator of resistance to lightning impulse - Google Patents
A kind of composite insulator of resistance to lightning impulse Download PDFInfo
- Publication number
- CN105161227B CN105161227B CN201510503678.6A CN201510503678A CN105161227B CN 105161227 B CN105161227 B CN 105161227B CN 201510503678 A CN201510503678 A CN 201510503678A CN 105161227 B CN105161227 B CN 105161227B
- Authority
- CN
- China
- Prior art keywords
- stress cone
- gold utensil
- resistance
- insulator
- sheath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012212 insulator Substances 0.000 title claims abstract description 71
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound 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[Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000010931 gold Substances 0.000 claims abstract description 43
- 229910052737 gold Inorganic materials 0.000 claims abstract description 43
- 238000009422 external insulation Methods 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 7
- 229910002027 silica gel Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound 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Abstract
A kind of composite insulator of resistance to lightning impulse of the present invention, including plug, the first sheath, the full skirt being located on sheath, high-pressure side gold utensil and ground terminal gold utensil, it is characterised in that：Further include at least one first stress cone or the first stress cone group, first stress cone or the first stress cone group are arranged on high-pressure side gold utensil and/or ground terminal gold utensil and plug junction, the first stress cone group is composed of the first stress cone of two cone bottom fittings, and first stress cone is external insulation stress cone.The invention has the advantages that：The structure safety of end metal fitting is effectively protected, improves the resistance to thunder level and service life of insulator；Reduce the dynamics for the lightning impulse voltage that end metal fitting is subject to；Ensure insulator Wen Sheng be no more than environment temperature 20K, improve the flashover voltage and discharge inception voltage of insulator；It is simple and reasonable, it is easy for installation.
Description
Technical field
The present invention relates to a kind of composite insulators of resistance to lightning impulse, belong to insulator arrangement technical field of structures.
Background technology
The rated voltage of electrification railway contact net work is 25kV, and system maximum operating voltage is 27.5kV.It is contacting
When thunder and lightning nearby occurs for net, contact net will appear the atmospheric over-voltage for substantially exceeding 27.5kV.This very high overvoltage can make
Insulator arc-over or breakdown and cause accident, damage to contact net equipment.Atmospheric over-voltage can be divided into lightning induced voltage
And attack lightning overvoltage directly.Lightning induced voltage is the acute variation due to electromagnetic field, electromagnetic coupling and generate, and direct lightning strike mistake
Voltage is then caused by flowing through the lightning current very big by object is hit.Lightning induced voltage does not exceed 500kV generally, therefore right
35kV and the harm of the insulator of following voltage class are maximum.Facts proved that for many years, Shanghai Minxing power supply station and other areas
The thunderstruck number of insulator is up to more than 40 time on 35kV circuits.Power-feed section administrative circuit in Guangzhou on electrification railway contact net,
On wide deep objective specially administrative circuit, the administrative circuit of high ferro section of Nanning Railway Bureau, porcelain insulator and composite insulator also repeatedly suffer thunder and lightning
The wide line multitude-Chinese parasol tree section of impact, particularly south is interior in short-term to recur in the case of spring Super Typhoon in 2014 and strong convective weather
54 lightning impulses, insulator umbrella punctures, at electric discharge burn 19, and carrier cable twisted wire multiply is blown.Lightning impulse is to contact net
Harm cause the height concern of relevant railway department and pay attention to, prevent Lightning Disaster, improve the resistance to of contact net important component
Thunder is horizontal, it is ensured that safety of railway traffic is extremely urgent.
Composite insulator used in China's electrification railway contact net is used on high voltage power transmission and transforming circuit at present
According to iron mark TB/T3199.2-2008 electrification railway contact net insulators on the basis of similar voltage class composite insulator
Second part：What the requirement of bar-shaped composite insulator manufactured and designed, resistance to thunder level is not high.And for electrification railway contact net knot
The feelings such as the dense vegetations such as structure is complicated, metal netware is more, electromagnetic field intensity height, Along Railway trees, on the sunny side slope surface are more, tunnel is more
Condition, the probability of lightning impulse are much larger than the actual conditions of other high-tension lines, specific aim research and develop resistance to thunder level it is higher it is compound absolutely
Edge is significant.
Invention content
The present invention provides a kind of rational in infrastructure, easy for installation and water of resistance to thunder to overcome above-mentioned deficiency of the prior art
Flat high electrification railway contact net composite insulator.
To achieve the above object, solution of the invention is：A kind of composite insulator of resistance to lightning impulse, including plug,
First sheath, the full skirt being located on sheath, high-pressure side gold utensil, ground terminal gold utensil and at least one first stress cone or first should
Power cone group, first stress cone or the first stress cone group are arranged on high-pressure side gold utensil and/or ground terminal gold utensil is connect with plug
Place, the first stress cone group are composed of the first stress cone that two cone bottoms are bonded.Insulator end gold utensil is entire exhausted
The most key position of edge, if this position of lightning surge impact failure, the first sheath may be burnt, crack and make
It is exposed into plug, and plug burn can form charing road warp after being damaged, this charing path is irreversible, with charing path
Continuous extension, core brittle fracture will be caused and cause accident.After setting corresponding external insulation stress cone, as lightning impulse voltage is made
With here or it is neighbouring when, the dispersible lightning current wave head of stress cone, mitigate lightning current rising steepness, increased at stress cone in addition
The thickness of external insulation, the structure of can effectively protect end metal fitting is safe, improves the resistance to thunder level and service life of insulator.
Preferably, the composite insulator of resistance to lightning impulse further includes the second sheath, the second shield described in second sheath
Set is wrapped in two stress cone junctions of stress cone group, and second sheath is HTV silica gel sheaths.HTV silica gel sheaths can be most
Big degree reduces the lightning impulse voltage that end metal fitting is subject to, and protects end metal fitting.
China's electrifing railway contacting net system maximum operating voltage be 27.5kV, the horizontal peak of the resistance to thunder of Composite Insulators
It is worth for 310kV, when lightning current is more than line lightning resisting level, insulator surface flashover can be caused.Lightning stroke flashover time majority is only
For 50s or so, line-breaker has little time to act, and when only flashover channel switchs to power frequency short circuiting arc, breaker can just trip.
Impulse flashover switchs to stablize the probability (probability of sustained arc) of power frequency arc and the relationship of field strength is：
η=(4.5E0.75- 14) % formulas (1-1)
In formula：η-power frequency continued flow builds arc probability
Neutral point non-direct grounding system insulator chain average field-strength, unit kV/m, wherein μ e are circuit
Rated voltage, unit kV；Lj be insulator string electrical arc distance, unit m.
It calculates (one)：
With the FQBSG-25/12-890JHP sticks post composite insulators and FQXSG-25/160/940HH produced at present
Composite rod insulator is as follows with being compared after improvement with calculating for model composite insulator：(system operating voltage is pressed
27.5kV it calculates)
Example one：The FQBSG-25/12-890JHP insulators produced at present, it is known that arcing distance Lj=0.68m, E=
27.5/ (2 × 0.68)=20.22/m is calculated as follows by formula (1-1)：
η=(4.5 × 20.22-14) %=28.90%
Improved same model insulator, it is known that arcing distance Lj=0.752m, E=27.5/ (2 × 0.752)=
18.22kV/m is calculated as follows by formula (1-1)：
η=(4.5 × 18.22-14) %=25.68%
Example two：The FQXSG-25/160-940HH insulators produced at present, it is known that arcing distance Lj=0.72m, E=
27.5/ (2 × 0.72)=20kV/m is calculated as follows by formula (1-1)：
η=(4.5 × 20-14) %=28.56%
Improved same model insulator, it is known that arcing distance Lj=0.881m, E=27.5/ (2 × 0.881)=
15.60kV/m is calculated as follows by formula (1-1)：
η=(4.5 × 15.6-14) %=21.32%
Result of calculation shows that the probability of sustained arc of insulator after improving reduces by 3.22% and 7.24% respectively, effectively inhibits stabilization
The generation of power frequency arc, this is highly beneficial to the safety of the insulator under lightning impulse.
It calculates (two)：
The horizontal important aspect of resistance to thunder of Voltage for Insulators on HV Lines is the lightning impulse flashover depending on insulator chain
Voltage, under normal circumstances insulator chain positive polarity lightning impulse flashover voltage be less than negative polarity, therefore the flashover voltage of insulator
It is calculated by positive polarity lightning impulse flashover voltage.Its calculation formula is：
UI50=6.3Ld- 37.5kV (peak) formula (1-2)
In formula：LdFor dry arc-over distance, unit cm.
(example one) is by taking improved FQBSG (NL) -25/12-890JHP insulators as an example：
Know according to formula (1-2)：UI50=6.3 × 75.2-37.5=466.26kV (peak) considers further that lightning impulse is resistant to
Voltage (UW1) the 90% of flashover voltage is generally, therefore have：
UW1=466.26 × 0.9=419.6kV (peak)
(example two) is by taking improved FQXSG (NL) -12/160-940HH insulators as an example
Know according to formula (1-2)：UI50=6.3 × 88.1-37.5=517.53kV (peak) considers further that lightning impulse is resistant to
Voltage (UW1) the 90% of flashover voltage is generally, therefore have：
UW1=517.53 × 0.9=465.77kV (peak)
The lightning impulse withstand voltage that result of calculation shows to innovate improved insulator is than TB/T3199.2-2008 standard
109.6kV and 155.77kV is respectively increased in value.
Preferably, the composite insulator of resistance to lightning impulse further include can with the pressure shading ring of equalizing voltage, it is described
Pressure shading ring is arranged on high-pressure side and/or ground terminal gold utensil.The voltage's distribiuting of insulator is related with the direct-to-ground capacitance of itself, right
Capacitance big voltage distribution of insulator in ground is uniform, on the contrary then uneven.The direct-to-ground capacitance of composite insulator is small, and voltage's distribiuting is uneven
It is even and more obvious with voltage raising inhomogeneities, set after uniform shading ring can equalizing voltage, weaken the electric field of parallel direction
Power conducive to conducting particles is inhibited to develop along face, prevents flashover.Maximum field intensity at gold utensil can be reduced simultaneously, it is abnormal to reduce electric field
Change degree conducive to the flashover voltage of the insulator and discharge inception voltage is improved, under lightning surge impact, can attract electric arc in itself.
The pressure shading ring, which is equipped with, to be raised, and ring set one, ring diameter is parallel to cluster parachute, and optimized dimensions are insulator gamp diameter
70%, arcing distance is not influenced, without in-site installation, electric property is good, and impacts insulator in lightning impulse overvoltage
When the high temperature that moment can be generated export, ensure that insulator Wen Sheng in this case is no more than environment temperature 20K, protection is exhausted
Edge is injury-free.
A kind of double insulation composite insulators of resistance to lightning impulse, it is compound including wire jumper clip and previously described resistance to lightning impulse
Insulator, the wire jumper clip are set between high-pressure side gold utensil and plug on bolt.
A kind of rodlike suspended compound insulator of resistance to lightning impulse, including the previously described composite insulator of resistance to lightning impulse and
At least one second stress cone or the second stress cone group, second stress cone or the second stress cone group are arranged on plug, institute
The second stress cone group is stated to be composed of the second stress cone of two cone bottom fittings.
A kind of double resistance to rodlike suspended compound insulators of lightning impulse of insulation, including previously described double resistance to lightning impulses of insulation
Composite insulator and at least one second stress cone or the second stress cone group, the wire jumper clip are set to positioned at high-pressure side gold utensil
And between plug on bolt, second stress cone or the second stress cone group are arranged on plug, the second stress cone group
It is composed of the second stress cone of two cone bottom fittings.
Advantageous effect：
(1) the structure safety of end metal fitting is effectively protected, improves the resistance to thunder level and service life of insulator；
(2) reduce the dynamics for the lightning impulse voltage that end metal fitting is subject to；
(3) ensure insulator Wen Sheng be no more than environment temperature 20K, improve insulator flashover voltage and bloom electricity
Pressure；
(4) it is simple and reasonable, it is easy for installation.
Description of the drawings
Attached drawing 1 is the composite insulator structure of resistance to lightning impulse schematic diagram of the invention.
Attached drawing 2 is the double insulation composite insulator structure of resistance to lightning impulse schematic diagrames of the invention.
Attached drawing 3 is double resistance to rodlike suspension composite structure schematic diagrames of lightning impulse of insulation of the invention.
Attached drawing 4 is double resistance to rodlike suspension composite structure schematic diagrames of lightning impulse of insulation of the invention.
In figure：1：Plug；2：First sheath；3：Full skirt；4：Press shading ring；51：High-pressure side gold utensil；52：Ground terminal gold
Tool；6：First stress cone；7：Wire jumper clip；8：Second sheath；61：Second stress cone.
Specific embodiment
The present invention is explained with reference to the accompanying drawings and detailed description.
Specific embodiment one：
A kind of composite insulator of resistance to lightning impulse of the present invention, including plug 1, the first sheath 2, full skirt 3, press shading ring 4,
High-pressure side gold utensil 51, ground terminal gold utensil 52, the first stress cone 6 and the second sheath 8.First sheath 2 is located at the outside of plug 1；Umbrella
Skirt 3 is set on the first sheath 2；First stress cone 6 is equipped with two groups, bores bottom by two the first stress cones 6 for every group and is sticked to form, respectively
Set on plug both ends, the first stress cone is external insulation stress cone；Pressure shading ring 4 be located at stress cone 6 and high-pressure side gold utensil 51 and/
Or between ground terminal gold utensil 52；Second sheath 8 is HTV silica gel sheaths, outside gold utensil.
Specific embodiment two：
A kind of double insulation composite insulators of resistance to lightning impulse of the invention, including plug 1, the first sheath 2, full skirt 3, pressure screen
Cover ring 4, high-pressure side gold utensil 51, ground terminal gold utensil 52, the first stress cone 6 and the second sheath 8.First sheath 2 is located at the outer of plug 1
Side；Full skirt 3 is set on the first sheath 2；First stress cone 6 is equipped with two groups, and every group is bored bottom fitting group by two the first stress cones 6
Into being respectively arranged on plug both ends, the first stress cone is external insulation stress cone；Pressure shading ring 4 is located at stress cone 6 and high-pressure side gold
Between tool 51 and/or ground terminal gold utensil 52；Wire jumper clip 7 is set between high-pressure side gold utensil 5 and plug 1 on bolt；
Second sheath 8 is HTV silica gel sheaths, outside gold utensil.
Specific embodiment three：
A kind of composite insulator of resistance to lightning impulse of the present invention, including plug 1, the first sheath 2, full skirt 3, press shading ring 4,
High-pressure side gold utensil 51, ground terminal gold utensil 52, the first stress cone 6, the second stress cone 61 and the second sheath 8.First sheath 2 is located at core
The outside of stick 1；Full skirt 3 is set on the first sheath 2；First stress cone 6 is equipped with two groups, and every group is bored bottom by two the first stress cones 6
It being sticked to form, is respectively arranged on plug both ends, the second stress cone 61 is equipped at least one set, and the second stress cone 61 is arranged on plug,
Every group of second stress cone by two cone bottom fittings is composed, and the first stress cone 6 and the second stress cone 61 are all that external insulation should
Power is bored；Pressure shading ring 4 is between stress cone 6 and high-pressure side gold utensil 51 and/or ground terminal gold utensil 52；Second sheath 8 is HTV
Silica gel sheath, outside gold utensil.
Specific embodiment four：
A kind of composite insulator of resistance to lightning impulse of the present invention, including plug 1, the first sheath 2, full skirt 3, press shading ring 4,
High-pressure side gold utensil 51, ground terminal gold utensil 52, the first stress cone 6, the second stress cone 61,7 and second sheath 8 of wire jumper clip.First
Sheath 2 is located at the outside of plug 1；Full skirt 3 is set on the first sheath 2；First stress cone 6 is equipped with two groups, and every group by two first
Stress cone 6 is bored bottom and is sticked to form, and is respectively arranged on plug both ends, and the second stress cone 61 is equipped at least one set, and the second stress cone 61 is set
It puts on plug, every group of second stress cone by two cone bottom fittings is composed, and the first stress cone 6 and the second stress cone 61 are all
For external insulation stress cone；Pressure shading ring 4 is between stress cone 6 and high-pressure side gold utensil 51 and/or ground terminal gold utensil 52；Wire jumper
Clip 7 is set between high-pressure side gold utensil 5 and plug 1 on bolt；Second sheath 8 is HTV silica gel sheaths, set on gold utensil
It is external.
Claims (2)
1. a kind of composite insulator of resistance to lightning impulse, including plug, the first sheath, the full skirt being located on sheath, high-pressure side gold utensil
And ground terminal gold utensil, it is characterised in that：Further include at least one first stress cone or the first stress cone group, first stress cone
Or first stress cone group be arranged on high-pressure side gold utensil and/or ground terminal gold utensil and plug junction, the first stress cone group by
First stress cone of two cone bottom fittings is composed；
The composite insulator of resistance to lightning impulse includes at least one second stress cone or the second stress cone group, and described second should
Power is bored or the second stress cone group is arranged on plug, and the second stress cone group is combined by the second stress cone that two cone bottoms are bonded
It forms, second stress cone is external insulation stress cone；
The composite insulator of resistance to lightning impulse further includes the second sheath, and second sheath be wrapped in stress cone group two should
Power bores junction, and second sheath is HTV silica gel sheaths；
The pressure shading ring of equalizing voltage is further included, the pressure shading ring is arranged on high-pressure side and/or ground terminal gold utensil.
2. a kind of double insulation composite insulators of resistance to lightning impulse, it is characterised in that：Including wire jumper clip and as described in claim 1
The composite insulator of resistance to lightning impulse, the wire jumper clip is set between high-pressure side gold utensil and plug on bolt.
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| CN205004117U (en) * | 2015-08-13 | 2016-01-27 | 秦皇岛凯达电气化铁路器材有限公司 | Composite insulator |
| CN205303080U (en) * | 2015-08-13 | 2016-06-08 | 秦皇岛凯达电气化铁路器材有限公司 | Resistant bar -shaped suspension type composite insulator of lightning impulse |
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| CN201966005U (en) * | 2010-06-11 | 2011-09-07 | 李景禄 | Strong lightning resistant composite insulator |
| CN201927981U (en) * | 2010-11-19 | 2011-08-10 | 中国科学院等离子体物理研究所 | Direct-current high-voltage composite cable accessory |
| CN102680871B (en) * | 2012-06-15 | 2014-12-24 | 甘肃省电力公司刘家峡水电厂 | Test method for unshaded corona onset voltage of medium-voltage crosslinked polyethylene cable |
| CN203135376U (en) * | 2013-03-12 | 2013-08-14 | 陶柏洪 | Cable terminal for electrified railway |
| CN203387149U (en) * | 2013-06-24 | 2014-01-08 | 安徽国华新材料有限公司 | 10-kW outdoor-indoor terminal |
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| CN205004117U (en) * | 2015-08-13 | 2016-01-27 | 秦皇岛凯达电气化铁路器材有限公司 | Composite insulator |
| CN205303080U (en) * | 2015-08-13 | 2016-06-08 | 秦皇岛凯达电气化铁路器材有限公司 | Resistant bar -shaped suspension type composite insulator of lightning impulse |
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