CN102298996A - Extra-high voltage composite insulator with uniform electric-field distribution - Google Patents
Extra-high voltage composite insulator with uniform electric-field distribution Download PDFInfo
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- CN102298996A CN102298996A CN2011102547870A CN201110254787A CN102298996A CN 102298996 A CN102298996 A CN 102298996A CN 2011102547870 A CN2011102547870 A CN 2011102547870A CN 201110254787 A CN201110254787 A CN 201110254787A CN 102298996 A CN102298996 A CN 102298996A
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Abstract
The invention relates to an extra-high voltage composite insulator with uniform electric-field distribution and belongs to the technical field of electric materials. In the extra-high voltage composite insulator, a silicon rubber insulator is connected with a nonlinear characteristic insulator; a grounding electrode end and an equalizing ring are arranged at the end of the silicon rubber insulator; a high-voltage electrode end for fixing a conductor and the equalizing ring are arranged at the end of the nonlinear characteristic insulator; the silicon rubber insulator accounts for 4/5 of total length of the extra-high voltage composite insulator; and the nonlinear characteristic insulator accounts for 1/5 of total length of the extra-high voltage composite insulator. By the extra-high voltage composite insulator, an insulator monomer is prepared from a nonlinear composite material and is assembled by mixing the traditional silicon rubber insulator monomer, non-uniformity of whole electric-field distribution of the extra-high voltage insulator can be obviously improved, the safety and reliability in the operating process are improved, the service life of the insulator is prolonged, dimension of the equalizing ring is reduced and even canceled, and the difficulty and cost of design, production and installation of the extra-high voltage insulator are greatly reduced.
Description
Technical field
The present invention relates to the uniform ultra high voltage synthetic insulator of a kind of Electric Field Distribution, belong to the electrical material technical field.
Background technology
In the high voltage power transmission and transforming system, insulation is one of the most key key problem; The system voltage grade is high more, and the importance of Insulation Problems and degree of difficulty are all the more remarkable.Silicon rubber synthetic insulators is the insulator arrangement of extensive use in the electric power system, and the voltage that in use bears distributes often extremely inhomogeneous.In the high-pressure side part of insulator, the electric field strength of being born is the mean value of whole electric field strength head and shoulders above, even reach the several times of mean value, has brought a series of adverse influences thus, especially the problem of material aging.Silicon rubber is as organic polymer class dielectric substance, and the electric field strength of bearing is big more, and its aging speed is often faster, and degree is also even more serious, can bring great threat to the long-term safety stable operation of system thus.
The system voltage grade is high more, and the problem of insulator non-uniform electric is also serious more.In order to improve the uniformity coefficient that the composite insulator global voltage distributes, relax local high electric field strength, the most frequently used technological means is to arrange grading ring at the insulator electrode tip at present.This measure has certain effect for relaxing the insulator non-uniform electric field, but can significantly increase the complexity and the degree of difficulty of device fabrication, and all presses effect can not reach more satisfactory degree.For example, in certain 1000kV extra high voltage line synthetic insulator design, insulator umbrella footpath 200mm, and the grading ring external diameter reaches 800mm, diameter of section requirement 100mm, greatly increased insulator to overhead line structures in the requirement aspect bulk and the weight capacity; Even after taking the measure of above-mentioned all pressures, the ratio of the minimax numerical value of insulator axial electric field intensity is still up to more than 6 times.
Summary of the invention
The objective of the invention is to propose the uniform ultra high voltage synthetic insulator of a kind of Electric Field Distribution, at the extreme insulator that adopts a kind of alternative traditional silicon elastomeric material of insulator of novel non-linearity Composite Preparation of insulator string high-tension electricity, to improve the whole non-uniform electric of insulator string.
The uniform ultra high voltage synthetic insulator of Electric Field Distribution that the present invention proposes, extreme and the grading ring of high-tension electricity that comprises grounding electrode end and grading ring, silicon rubber insulator, nonlinear characteristic insulator and fixing cord, silicon rubber insulator and nonlinear characteristic insulator interconnect, described grounding electrode end and grading ring place the end of silicon rubber insulator, and the extreme and grading ring of the high-tension electricity of described fixing cord places the end of nonlinear characteristic insulator; Described silicon rubber insulator accounts for 4/5 of ultra high voltage synthetic insulator total length, and described nonlinear characteristic insulator accounts for 1/5 of ultra high voltage synthetic insulator total length.
In the above-mentioned ultra high voltage synthetic insulator, the material of described nonlinear characteristic insulator is silicone rubber based insulating composite material, the preparation method of this composite material is that the Zinc oxide powder that will have pressure-sensitive character is filled in the silastic material, and the volume ratio of Zinc oxide powder and silicon rubber is: Zinc oxide powder: silicon rubber=(0.4～0.6): 1.
The uniform ultra high voltage synthetic insulator of Electric Field Distribution that the present invention proposes, adopt novel non-linearity Composite Preparation insulator monomer, dress up novel ultra high voltage synthetic insulator with traditional silicon rubber insulator monomer combined group, can significantly improve the inhomogeneities of the whole Electric Field Distribution of ultra high voltage insulator, improve security reliability and the useful life of ultra high voltage insulator in running.The ultra high voltage synthetic insulator that adopts the present invention to propose can further be adjusted insulator equalizing ring structural design partly, reduces grading ring size even cancellation, greatly reduces ultra high voltage insulator design production mounting hardness and cost.
Description of drawings
Fig. 1 is the structural representation of the uniform ultra high voltage synthetic insulator of Electric Field Distribution that proposes of the present invention.
Among Fig. 1, the 1st, connect the grounding electrode end and the grading ring thereof of fixed structure such as shaft tower, the 2nd, traditional silicon rubber-covered subdivision (account for total length 4/5), the 3rd, nonlinear characteristic insulator part (account for total length 1/5), the 4th, the extreme and grading ring of the high-tension electricity of fixing cord, the 5th, design sketch in kind.
Embodiment
The uniform ultra high voltage synthetic insulator of Electric Field Distribution that the present invention proposes, its structure as shown in Figure 1, comprise the extreme and grading ring 5 of high-tension electricity of grounding electrode end and grading ring 1, silicon rubber insulator 2, nonlinear characteristic insulator 3 and fixing cord, silicon rubber insulator 2 and nonlinear characteristic insulator 3 interconnect.Grounding electrode end and grading ring 1 place the end of silicon rubber insulator 2.Extreme and the grading ring 4 of the high-tension electricity of fixing cord places the end of nonlinear characteristic insulator 3.Silicon rubber insulator 2 accounts for 4/5 of ultra high voltage synthetic insulator total length, and nonlinear characteristic insulator 3 accounts for 1/5 of ultra high voltage synthetic insulator total length.
In the above-mentioned ultra high voltage synthetic insulator, the material of described nonlinear characteristic insulator is silicone rubber based insulating composite material, the preparation method of this composite material is that the Zinc oxide powder that will have pressure-sensitive character is filled in the silastic material, and the volume ratio of Zinc oxide powder and silicon rubber is: Zinc oxide powder: silicon rubber=(0.4～0.6): 1.
Ultra high voltage synthetic insulator of the present invention adopts a kind of non-linear dielectric property that has, and the material preparation of nonlinear characteristic insulator becomes novel non-linearity characteristic insulator monomer.This material possesses significant non-linear dielectric property, and material dielectric constant and silicon rubber are approaching when no applying bias; Along with bias voltage raises, material dielectric constant slowly increases; (after 100～300V/mm), material dielectric constant presents the trend that the index magnitude increases fast, and numerical value reaches hundreds of very soon when applying bias surpasses threshold limit value.
With the concrete process equipment and the program of this material preparation insulator monomer, with traditional silicon rubber insulator monomer all fours.The novel non-linearity characteristic insulator monomer length of preparation is about 1.5m, is about 1/5 of ultra high voltage synthetic insulator entire length (total length that does not contain the gold utensil part is about about 7.5m).
The present invention adopts novel non-linearity characteristic insulator monomer to mix assembling ultra high voltage synthetic insulator with traditional silicon rubber insulator monomer, nonlinear characteristic insulator monomer length is about 1/5 of ultra high voltage synthetic insulator entire length (not containing the gold utensil part), places the high-tension electricity of fixing cord extreme; Tradition silicon rubber insulator monomer length is about 4/5 of ultra high voltage synthetic insulator entire length (not containing the gold utensil part), places the grounding electrode end that connects fixed structures such as shaft tower.The ratio that novel non-linearity characteristic insulator monomer accounts for ultra high voltage synthetic insulator entire length can design adjustment targetedly according to the uneven distribution situation of insulator actual moving process space electric field of living in.
Required other parts (gold utensil, plug etc.) of the ultra high voltage synthetic insulator that assembling the present invention proposes are identical with traditional silicon rubber synthetic insulators, and process equipment that assembling process relates to and program are also identical.Ultra high voltage synthetic insulator overall structure after the assembling as shown in Figure 1.
The ultra high voltage synthetic insulator that the present invention proposes can significantly improve the inhomogeneities of the whole Electric Field Distribution of ultra high voltage insulator, improves security reliability and the useful life of ultra high voltage insulator in running; Than the designs that all adopt traditional silicon rubber insulator, the ratio of the minimax numerical value of this novel insulator axial electric field intensity is less than 3 times, and this odds ratio adopts the conventional insulators of all pressing measure to reduce approximately half.
Below introduce one embodiment of the present of invention:
(1) adopts novel non-linearity Composite Preparation insulator monomer
Adopt a kind of silicone rubber based insulating composite material, carry out the preparation of novel non-linearity characteristic insulator monomer with non-linear dielectric property.This material adopts the ZnO with pressure-sensitive character powder filled in the traditional silicon elastomeric material, and the volume ratio of ZnO powder and silicon rubber is 0.5: 1.This material possesses significant non-linear dielectric property, and material dielectric constant and silicon rubber are approaching when no applying bias; Along with bias voltage raises, material dielectric constant slowly increases; After applying bias surpassed threshold limit value (200V/mm), material dielectric constant presented the trend that the index magnitude increases fast, and numerical value reaches more than 200 very soon.
With the concrete process equipment and the program of this material preparation insulator monomer, with traditional silicon rubber insulator monomer all fours.The novel non-linearity characteristic insulator monomer length 1.5m of preparation.
(2) adopt novel non-linearity characteristic insulator monomer to mix assembling ultra high voltage synthetic insulator with traditional silicon rubber insulator monomer
Novel non-linearity characteristic insulator monomer length 1.5m for 1/5 of ultra high voltage synthetic insulator entire length (not containing the gold utensil part), places the high-tension electricity of fixing cord extreme; Tradition silicon rubber insulator monomer length 6m is 4/5 of ultra high voltage synthetic insulator entire length (not containing the gold utensil part), places the grounding electrode end that connects fixed structures such as shaft tower.
It is identical with traditional silicon rubber synthetic insulators to assemble other required parts of novel ultra high voltage synthetic insulator (gold utensil, plug etc.), and process equipment that assembling process relates to and program are also identical.
Novel ultra high voltage synthetic insulator after the assembling is carried out simulation analysis and test, correlated results shows: the ratio of the minimax numerical value of this novel insulator axial electric field intensity is less than 3 times, reduces approximately half than the design of whole employings tradition silicon rubber insulators; Under same test conditions, the extreme visual corona of insulator high-tension electricity obviously weakens, audible noise obviously reduces; Corona current significantly reduces, and leakage current does not significantly increase, and shows that insulator integral insulation performance is uninfluenced substantially.
Claims (2)
1. uniform ultra high voltage synthetic insulator of Electric Field Distribution, it is characterized in that this ultra high voltage synthetic insulator comprises the extreme and grading ring of high-tension electricity of grounding electrode end and grading ring, silicon rubber insulator, nonlinear characteristic insulator and fixing cord, silicon rubber insulator and nonlinear characteristic insulator interconnect, described grounding electrode end and grading ring place the end of silicon rubber insulator, and the extreme and grading ring of the high-tension electricity of described fixing cord places the end of nonlinear characteristic insulator; Described silicon rubber insulator accounts for 4/5 of ultra high voltage synthetic insulator total length, and described nonlinear characteristic insulator accounts for 1/5 of ultra high voltage synthetic insulator total length.
2. ultra high voltage synthetic insulator as claimed in claim 1, the material that it is characterized in that wherein said nonlinear characteristic insulator is silicone rubber based insulating composite material, the preparation method of this composite material is that the Zinc oxide powder that will have pressure-sensitive character is filled in the silastic material, and the volume ratio of Zinc oxide powder and silicon rubber is: Zinc oxide powder: silicon rubber=(0.4～0.6): 1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543323A (en) * | 2011-11-29 | 2012-07-04 | 河南电力试验研究院 | Staging dielectric constant composite insulator |
| CN107768045A (en) * | 2017-10-31 | 2018-03-06 | 清华大学 | A kind of composite insulator with the equal laminated structure of nonlinear conductance material |
| CN107785133A (en) * | 2017-10-31 | 2018-03-09 | 清华大学 | Adaptively regulate and control the equipment outlet sleeve of composite using electrical conductivity |
| CN108627786A (en) * | 2017-03-22 | 2018-10-09 | 中国电力科学研究院 | Different voltages waveform subscript quasi-electric field generating means and electric field measuring apparatus calibrating installation |
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| CN1512520A (en) * | 2002-12-27 | 2004-07-14 | 东莞市高能实业有限公司 | Capacity uniform voltage type stick shape suspending composite insulator |
| CN1996510A (en) * | 2006-12-27 | 2007-07-11 | 清华大学深圳研究生院 | Control method for the field intensity at the compound insulator end and compound insulator |
| CN2922076Y (en) * | 2006-05-13 | 2007-07-11 | 襄樊国网合成绝缘子股份有限公司 | Semiconductor voltage-balancing synthetic insulator |
| CN201215747Y (en) * | 2007-12-29 | 2009-04-01 | 南方电网技术研究中心 | Hanging type composite insulator pressure equalizer ring construction for ultra-high voltage transmission line |
| CN101436452A (en) * | 2008-12-19 | 2009-05-20 | 河南电力试验研究院 | Synthetic insulator |
| CN201966006U (en) * | 2010-12-27 | 2011-09-07 | 叶力平 | Dual-ring equalizing rings for extra-high voltage direct current transmission dual suspension string composite insulator |
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2011
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Patent Citations (6)
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| CN1512520A (en) * | 2002-12-27 | 2004-07-14 | 东莞市高能实业有限公司 | Capacity uniform voltage type stick shape suspending composite insulator |
| CN2922076Y (en) * | 2006-05-13 | 2007-07-11 | 襄樊国网合成绝缘子股份有限公司 | Semiconductor voltage-balancing synthetic insulator |
| CN1996510A (en) * | 2006-12-27 | 2007-07-11 | 清华大学深圳研究生院 | Control method for the field intensity at the compound insulator end and compound insulator |
| CN201215747Y (en) * | 2007-12-29 | 2009-04-01 | 南方电网技术研究中心 | Hanging type composite insulator pressure equalizer ring construction for ultra-high voltage transmission line |
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| CN201966006U (en) * | 2010-12-27 | 2011-09-07 | 叶力平 | Dual-ring equalizing rings for extra-high voltage direct current transmission dual suspension string composite insulator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543323A (en) * | 2011-11-29 | 2012-07-04 | 河南电力试验研究院 | Staging dielectric constant composite insulator |
| CN102543323B (en) * | 2011-11-29 | 2014-04-02 | 河南省电力公司电力科学研究院 | Staging dielectric constant composite insulator |
| CN108627786A (en) * | 2017-03-22 | 2018-10-09 | 中国电力科学研究院 | Different voltages waveform subscript quasi-electric field generating means and electric field measuring apparatus calibrating installation |
| CN108627786B (en) * | 2017-03-22 | 2020-10-09 | 中国电力科学研究院 | Electric field measuring instrument calibrating device |
| CN107768045A (en) * | 2017-10-31 | 2018-03-06 | 清华大学 | A kind of composite insulator with the equal laminated structure of nonlinear conductance material |
| CN107785133A (en) * | 2017-10-31 | 2018-03-09 | 清华大学 | Adaptively regulate and control the equipment outlet sleeve of composite using electrical conductivity |
| CN107785133B (en) * | 2017-10-31 | 2019-09-27 | 清华大学 | Adaptively regulate and control the equipment outlet sleeve of composite material using conductivity |
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| CN102298996B (en) | 2013-03-06 |
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