CN205303080U - Resistant bar -shaped suspension type composite insulator of lightning impulse - Google Patents

Resistant bar -shaped suspension type composite insulator of lightning impulse Download PDF

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Publication number
CN205303080U
CN205303080U CN201620042924.2U CN201620042924U CN205303080U CN 205303080 U CN205303080 U CN 205303080U CN 201620042924 U CN201620042924 U CN 201620042924U CN 205303080 U CN205303080 U CN 205303080U
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China
Prior art keywords
stress cone
insulator
gold utensil
lightning impulse
sheath
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CN201620042924.2U
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Chinese (zh)
Inventor
乔培凯
翟胜利
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KAIDA GAODIAN RAILWAY ELECTRIC EQUIPMENT MANUFACTURING CO., LTD.
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Kaida Gaodian Railway Electric Equipment Manufacturing Co Ltd
Qinhuangdao Kaida Electtric Railway Equipment Co Ltd
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Abstract

The utility model relates to a resistant bar -shaped suspension type composite insulator of lightning impulse, include plug, first sheath, establish full skirt, high -pressure side gold utensil and earthing terminal gold utensil on the sheath, its characterized in that: still include at least one first stress cone or first stress cone group, first stress cone or first stress cone group set up at high -pressure side gold utensil and/or earthing terminal gold utensil and plug junction, first stress cone group is formed by the first stress cone combination of two awl end laminatings, first stress cone is the external insulation stress cone. The utility model discloses following beneficial effect has: the structure safety of effectual protection tip gold utensil has improved the resistant thunder level and the life of insulator, the dynamics of the lightning impulse voltage that the tip gold utensil received has been reduced, guarantee the insulator the temperature rise no longer than ambient temperature 20K, improved the flashover voltage and the discharge inception voltage of insulator, simple structure is reasonable, simple to operate.

Description

A kind of bar-shaped suspended compound insulator of resistance to lightning impulse
Technical field
This utility model relates to a kind of bar-shaped suspended compound insulator of resistance to lightning impulse, belongs 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. Thunderstorm hour occurs near contact net, and contact net there will be the atmospheric over-voltage substantially exceeding 27.5kV. This significantly high overvoltage can make insulator arc-over or puncture and accidents caused, and contact net equipment is worked the mischief. Atmospheric over-voltage can be divided into lightning induced voltage and direct lightning strike overvoltage. Lightning induced voltage is the acute variation due to electromagnetic field, electromagnetic coupled and produce, direct lightning strike overvoltage is then cause owing to flowing through the lightning current being hit thing very big. Lightning induced voltage is generally not over 500kV, therefore endangers maximum to the insulator of 35kV and following electric pressure. Fact proved, for many years, Minxing, Shanghai power supply station and other area 35kV circuit on the thunderstruck number of times of insulator up to more than 40 times. On electrification railway contact net on the administrative circuit of Guangzhou power-feed section, wide deep visitor special administrative circuit, the administrative circuit of high ferro section of Nanning Railway Bureau, porcelain insulator and composite insulator also repeatedly suffer lightning impulse, particularly the wide line multitude-Chinese parasol tree section in south in spring in 2014 Super Typhoon and strong convective weather situation under, 54 lightning impulses are recurred in short-term, insulator umbrella punctures, burn 19 places of discharging, and carrier cable twisted wire multiply is blown. The harm of contact net is caused height concern and the attention of relevant railway department by lightning impulse, it is prevented that Lightning Disaster, improves the resistance to thunder level of contact net vitals, it is ensured that safety of railway traffic is extremely urgent.
The composite insulator that current China electrification railway contact net uses is on the basis being used similar electric pressure composite insulator on high voltage power transmission and transforming circuit according to ferrum mark TB/T3199.2-2008 electrification railway contact net insulator Part II: the requirement of bar-shaped composite insulator manufactures and designs, and resistance to thunder level is not high.And the dense vegetation such as, metal netware many, electromagnetic field intensity high, Along Railway trees complicated for electrification railway contact net structure, on the sunny side domatic many, the situation such as tunnel is many, the probability of lightning impulse is much larger than the practical situation of other high-tension lines, and the composite insulator that specific aim researches and develops resistance to thunder level higher is significant.
Utility model content
This utility model is in order to overcome above-mentioned deficiency of the prior art, it is provided that the electrification railway contact net bar-shaped suspended compound insulator of resistance to lightning impulse that a kind of rational in infrastructure, easy for installation and resistance to thunder level is high.
For achieving the above object, solution of the present utility model is: a kind of bar-shaped suspended compound insulator of resistance to lightning impulse, including plug, the first sheath, the full skirt being located on sheath, high-pressure side gold utensil, earth terminal gold utensil and at least one the first stress cone or the first stress cone group, described first stress cone or the first stress cone group are arranged on high-pressure side gold utensil and/or earth terminal gold utensil and plug junction, and described first stress cone group is combined by two the first stress cones boring end laminating. Insulator end gold utensil is the position that whole insulator is the most key, if this position of lightning surge impact failure, first sheath may be burnt, ftractureed and cause plug exposed, and plug burn impaired after can form carbonization road warp, this carbonization path is irreversible, along with the continuous extension in carbonization path, core brittle fracture will be caused and accidents caused. After the external insulation stress cone of correspondence is set; when acting on herein such as lightning impulse voltage or be neighbouring; stress cone dispersibles lightning current wave head; alleviate lightning current rising steepness; in addition stress cone place increases the thickness of external insulation; the structural safety of end metal fitting be can effectively protect, resistance to thunder level and the service life of insulator improved.
Preferably, the described bar-shaped suspended compound insulator of resistance to lightning impulse also includes the second sheath, and the second sheath described in described second sheath is wrapped in two stress cone junctions of stress cone group, and described second sheath is HTV silica gel sheath. HTV silica gel sheath can at utmost reduce 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 is 27.5kV, and the resistance to thunder horizontal peak of Composite Insulators is 310kV, when lightning current is more than line lightning resisting level, can cause insulator surface flashover. Lightning stroke flashover time majority is only about 50s, and line-breaker has little time action, and when only flashover passage transfers power frequency short circuiting arc to, chopper just can trip. The relation of probability (probability of sustained arc) and field intensity that impulse flashover transfers stable power frequency arc to is:
��=(4.5E0.75-14) % formula (1-1)
In formula: ��-power frequency continued flow builds arc probability
Neutral point non-direct grounding system insulator chain average field-strength, unit is kV/m, wherein �� e is circuit rated voltage, and unit is kV; Lj is insulator string electrical arc distance, and unit is m.
Calculate (one):
After the FQBSG-25/12-890JHP rod post composite insulators produced at present and FQXSG-25/160/940HH composite rod insulator and improvement, the calculating contrast of same model composite insulator is as follows: (system operating voltage calculates by 27.5kV)
Example one: the FQBSG-25/12-890JHP insulator 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):
��=(4.5 �� 20.22-14) %=28.90%
Same model insulator after improvement, 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):
��=(4.5 �� 18.22-14) %=25.68%
Example two: the FQXSG-25/160-940HH insulator 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):
��=(4.5 �� 20-14) %=28.56%
Same model insulator after improvement, 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):
��=(4.5 �� 15.6-14) %=21.32%
After result of calculation shows to improve, the probability of sustained arc of insulator reduces by 3.22% and 7.24% respectively, effectively suppresses to stablize the generation of power frequency arc, and the safety of insulator under lightning impulse is highly beneficial by this.
Calculate (two):
The horizontal important aspect of resistance to thunder of Voltage for Insulators on HV Lines is depending on the lightning impulse flashover voltage of insulator chain, generally insulator chain positive polarity lightning impulse flashover voltage is lower than negative polarity, and therefore the flashover voltage of insulator calculates by positive polarity lightning impulse flashover voltage. Its computing formula is:
UI50=6.3Ld-37.5kV (peak) formula (1-2)
In formula: LdFor dry arc-over distance, unit is cm.
(example one) for improve after FQBSG (NL)-25/12-890JHP insulator:
Know according to formula (1-2): UI50=6.3 �� 75.2-37.5=466.26kV (peak) considers further that lightning impulse withstand voltage (UW1) it is generally the 90% of flashover voltage, therefore have:
UW1=466.26 �� 0.9=419.6kY (peak)
(example two) for improve after FQXSG (NL)-12/160-940HH insulator
Know according to formula (1-2): UI50=6.3 �� 88.1-37.5=517.53kV (peak) considers further that lightning impulse withstand voltage (UW1) it is generally the 90% of flashover voltage, therefore have:
UW1=517.53 �� 0.9=465.77kY (peak)
Result of calculation shows that the lightning impulse withstand voltage innovating the insulator after improving is respectively increased 109.6kY and 155.77kY than TB/T3199.2-2008 standard value.
Preferably, the described bar-shaped suspended compound insulator of resistance to lightning impulse also include can all pressure shading rings of equalizing voltage, described all pressures shading ring is arranged on high-pressure side and/or earth terminal gold utensil. The voltage's distribiuting of insulator is relevant with the direct-to-ground capacitance of self, and the voltage distribution of insulator that direct-to-ground capacitance is big is uniform, otherwise then uneven. The direct-to-ground capacitance of composite insulator is little, and voltage's distribiuting is uneven, and raises inhomogeneities with voltage and become apparent from, arrange after uniform shading ring can equalizing voltage, weaken the electric field force of parallel direction, be beneficial to suppression conducting particles and develop along face, it is prevented that flashover. Gold utensil place maximum field intensity can be reduced simultaneously, reduce electric field distortion degree, be beneficial to raising the flashover voltage of the insulator and discharge inception voltage, under lightning surge is impacted, electric arc can be attracted in self. Described all pressures shading ring is provided with to be raised; ring set one; ring footpath is parallel to cluster parachute; optimized dimensions is the 70% of insulator gamp diameter, does not affect arcing distance, without in-site installation; electric property is good; and the high temperature that moment produces can be derived when lightning impulse overvoltage impacts insulator, it is ensured that insulator temperature rise in this case is less than ambient temperature 20K, and protection insulator is injury-free.
Preferably, the described bar-shaped suspended compound insulator of resistance to lightning impulse also includes at least one second stress cone or the second stress cone group, described second stress cone or the second stress cone group are arranged on plug, described second stress cone group is combined by two the second stress cones boring end laminating, and described second stress cone is external insulation stress cone.
Beneficial effect:
(1) it is effectively protected the structural safety of end metal fitting, improves resistance to thunder level and the service life of insulator;
(2) dynamics of the lightning impulse voltage that end metal fitting is subject to is decreased;
(3) ensure insulator temperature rise less than ambient temperature 20K, improve flashover voltage and the discharge inception voltage of insulator;
(4) simple and reasonable, easy for installation.
Accompanying drawing explanation
Accompanying drawing 1 is the bar-shaped suspension composite structure schematic diagram of the resistance to lightning impulse of this utility model.
In figure: 1: plug; 2: the first sheaths; 3: full skirt; 4: all press shading ring;51: high-pressure side gold utensil; 52: earth terminal gold utensil; 6: the first stress cones; 8: the second sheaths; 61: the second stress cones.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is explained.
Specific embodiment:
A kind of composite insulator of resistance to lightning impulse of this utility model, including plug the 1, first sheath 2, full skirt 3, all pressure shading ring 4, high-pressure side gold utensil 51, earth terminal gold utensil the 52, first stress cone the 6, second stress cone 61 and the second sheath 8. First sheath 2 is positioned at the outside of plug 1; Full skirt 3 is located on the first sheath 2; First stress cone 6 is provided with two groups, often group is bored the end by two the first stress cones 6 and is sticked to form, it is respectively arranged on plug two ends, second stress cone 61 is provided with least one set, second stress cone 61 is arranged on plug, often group is combined by two the second stress cones boring end laminating, and the first stress cone 6 and the second stress cone 61 are all external insulation stress cone; All pressure shading ring 4 is between stress cone 6 and high-pressure side gold utensil 51 and/or earth terminal gold utensil 52; Second sheath 8 is HTV silica gel sheath, is located at outside gold utensil.

Claims (4)

1. the bar-shaped suspended compound insulator of resistance to lightning impulse, including plug, the first sheath, the full skirt being located on sheath, high-pressure side gold utensil and earth terminal gold utensil, it is characterized in that: also include at least one first stress cone or the first stress cone group, described first stress cone or the first stress cone group are arranged on high-pressure side gold utensil and/or earth terminal gold utensil and plug junction, and described first stress cone group is combined by two the first stress cones boring end laminating.
2. a kind of bar-shaped suspended compound insulator of resistance to lightning impulse as claimed in claim 1, it is characterized in that: the described bar-shaped suspended compound insulator of resistance to lightning impulse also includes the second sheath, described second sheath is wrapped in two stress cone junctions of stress cone group, and described second sheath is HTV silica gel sheath.
3. a kind of bar-shaped suspended compound insulator of resistance to lightning impulse as claimed in claim 1, it is characterised in that: also include can all pressure shading rings of equalizing voltage, described all pressures shading ring is arranged on high-pressure side and/or earth terminal gold utensil.
4. a kind of bar-shaped suspended compound insulator of resistance to lightning impulse as claimed any one in claims 1 to 3, it is characterized in that: the described bar-shaped suspended compound insulator of resistance to lightning impulse also includes at least one second stress cone or the second stress cone group, described second stress cone or the second stress cone group are arranged on plug, described second stress cone group is combined by two the second stress cones boring end laminating, and described second stress cone is external insulation stress cone.
CN201620042924.2U 2015-08-13 2015-08-13 Resistant bar -shaped suspension type composite insulator of lightning impulse Active CN205303080U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105161227A (en) * 2015-08-13 2015-12-16 秦皇岛凯达电气化铁路器材有限公司 Composite insulator resistant to lightning strike

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105161227A (en) * 2015-08-13 2015-12-16 秦皇岛凯达电气化铁路器材有限公司 Composite insulator resistant to lightning strike
CN105161227B (en) * 2015-08-13 2018-07-03 秦皇岛凯达电气化铁路器材有限公司 A kind of composite insulator of resistance to lightning impulse

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Effective date of registration: 20190906

Address after: 062451 Memorial Bridge Industrial Zone, Hejian City, Cangzhou City, Hebei Province

Patentee after: KAIDA GAODIAN RAILWAY ELECTRIC EQUIPMENT MANUFACTURING CO., LTD.

Address before: 066000 No. 6, Zhuhai Road, Shanhaiguan economic and Technological Development Zone, Qinhuangdao, Hebei

Co-patentee before: KAIDA GAODIAN RAILWAY ELECTRIC EQUIPMENT MANUFACTURING CO., LTD.

Patentee before: QINHUANGDAO KAIDA ELECTTRIC RAILWAY EQUIPMENT CO., LTD.