CN1142558C

CN1142558C - Umbrella structure of composite insulator

Info

Publication number: CN1142558C
Application number: CNB00130075XA
Authority: CN
Inventors: 梁曦东; 王绍武
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2000-10-27
Filing date: 2000-10-27
Publication date: 2004-03-17
Anticipated expiration: 2020-10-27
Also published as: CN1289131A

Abstract

The present invention belongs to the technical field of a high-voltage insulator manufacturing technology. The present invention is formed by arrangement of a plurality of big umbrellas with equal diameters, and two or more than two small umbrellas which are arranged between every two adjacent big umbrellas. The extension length of each umbrella is not less than 20 millimeters, and the distance between two adjacent umbrellas is not less than 25 millimeters; the leakage distance which is provided by each small umbrella is greater than the leakage distance which is provided by each big umbrella, the ratio of the extension length of each big umbrella and the extension length of the minimum umbrella is not less than 1.5 to 1.8. A higher leakage distance can be realized by the insulator with a structure in a shape of an umbrella under the condition of ensuring good pollution resisting and humidity resisting performance in a given insulation distance, and the consumption of the material of an umbrella skirt of the insulator is largely reduced.

Description

Umbrella structure of composite insulator

Technical field the invention belongs to the sub-manufacturing technology of High-Voltage Insulation field, particularly umbrella structure of composite insulator design.

The background technology composite insulator claims synthetic insulator, organic insulation, non-porcelain insulator, rubber-covered, polymer insulator again.Product as the update of traditional porcelain insulator, composite insulator with its excellent resistant wet performance, high specific strength, shock-resistant, operation maintenance convenient and intrinsic characteristics such as anti-breakdown type structure, obtained a large amount of uses in various countries' electric power system since the eighties.Excellent resistant wet performance is the major reason that operation department of many State Grids selects composite insulator for use.Composite insulator is used to all kinds of medium and heavy pollution is regional, has effectively prevented the frequent pollution flashover accident that takes place of original porcelain insulator, and has reduced the operation maintenance workload of filthy regional power transmission and transforming equipment greatly.

Except natural atmospheric pollution level and meteorological condition, the external insulation performance of composite insulator depends on the hydrophobicity and the external insulation structure design of material.Under the acting in conjunction of environment and electric stress, the hydrophobicity of material may temporarily weaken even completely lose, and the quality of beveled structure determined the external insulation performance of composite insulator and influenced the process of The Ageing of Insulators this moment.Therefore beveled structure is composite insulator design and the key factor that must consider when selecting for use.

In fact, the design of composite insulator does not at present still have the international standard that is similar to porcelain insulator IEC815 with selecting for use, standard recommendation such as IEC815 the key parameter of selecting for use principle and external insulation structure should satisfy in designing of filthy regional porcelain insulator.And report also seldom about the research of the external insulation property influence of umbrella structure of composite insulator both at home and abroad.Therefore, the electric power system user can only be based on the operating experience of original porcelain insulator to selecting for use of composite insulator.

From the angle of producing, the composite insulator manufacturing process is simple, almost can low cost carry out multiple design, so the design of different manufacturers product often has very big-difference.Existing composite insulator can roughly be divided into two classes according to beveled structure: isometrical umbrella structure composite insulator and big umbellule structure composite insulator, respectively as shown in Figure 1 and Figure 2.Fig. 3 is the local enlarged diagram of full skirt 2 and sheath 3.At first describe several key parameters of umbrella structure of composite insulator, be defined as follows in conjunction with each figure:

Full skirt diameter: the external diameter of insulator full skirt 2;

Umbrella spacing: the axial distance between the corresponding points on certain point and the adjacent same relative position same diameter full skirt on the insulator full skirt 2;

Umbrella stretches out: the radial distance between insulator full skirt outer 21 and the sheath 3;

Insulation distance: the axial distance between the insulator two

ends gold utensil

11,12;

Leakage distance: between the insulator two

ends gold utensil

11,12, along the beeline on all full skirts 2 and sheath 3 surfaces.The leakage distance of selecting to adapt with running environment according to relevant criterion and operating experience is the main foundation that filthy regional porcelain insulator is selected for use.Many operations department compares the angle that is easy to wear out from composite insulator with porcelain insulator, consider service conditions the most serious when hydrophobicity completely loses, and requires composite insulator to have the leakage distance close or higher with porcelain insulator.

Creep distance coefficient: the ratio of insulator leakage distance and insulation distance.

Except that above-mentioned parameter, also have several special parameters for the composite insulator of big umbellule structure shown in Figure 2:

Gamp leakage distance: all gamp full skirt 2 creepage distance sums of composite insulator

Umbellule leakage distance: all umbellule full skirt 4 creepage distance sums of composite insulator;

Adjacent umbrella spacing: the axial distance between the adjacent full skirt of the composite insulator lower edge 22.

At present, full skirt 2 diameters of isometrical umbrella structure composite insulator shown in Figure 1 are generally 80 millimeters ~ 200 millimeters.When use in filthy area, in order to satisfy the more requirement of high-leakage distance, producer mainly increases the leakage distance of composite insulator by the method that strengthens full skirt diameter, compression umbrella spacing, because all full skirt diameters are identical, come in a large number under the water condition at heavy rain, snow melt, molten ice etc., isometrical umbrella structure is unfavorable for suppressing electric arc bridge joint between umbrella that continuous moisture film, current cause, on the contrary may since between serious umbrella bridge joint cause the decline of insulator overall performance.

Fig. 2 is the typical structure schematic diagram of big umbellule insulator, adopts small one and large one full skirt configuration.Full skirt 2 diameters of existing product gamp are generally at 100～200 millimeters, and umbellule full skirt 4 diameters are generally 80～150 millimeters, and the gamp umbrella stretches out the ratio that stretches out with the umbellule umbrella and is generally less than 1.5.For Fig. 2 insulator, the leakage distance that the leakage distance that gamp 2 provides obviously provides greater than umbellule 4.Equally, in order to satisfy operation department to the more requirement of high-leakage distance, often by strengthening the full skirt diameter, the method for compression umbrella spacing increases the leakage distance of composite insulator in producer.Because gamp provides main leakage distance in this structure, therefore the result who does so at first is the consumption that has significantly increased the full skirt material, has increased manufacturing cost.What is more important, this design can only increase the leakage distance of insulator to a certain extent, improves the dirty performance of resistant of insulator.When distance is too small between, umbrella excessive when the full skirt diameter, outwardly, leakage distance has had very big increase, but because equivalent diameter increases and possible bridge joint makes the utilance of leakage distance reduce, not only sudden strain of a muscle of the rain of insulator or pollution flashover performance obviously do not increase, on the contrary might saturated even decline.In addition, in known designs since gamp stretch out with umbellule stretch out smaller, gamp suppresses bridge joint between umbrella, prevents that the effect of serious icing snowberg and retardance electric arc serial connection is outstanding, the design that needs to be optimized.

Summary of the invention the objective of the invention is for overcoming the weak point of prior art, a kind of umbrella structure of composite insulator of optimization is proposed, the composite insulator of this beveled structure is rearranged by the gamp of some equal diameters and the two or more umbellules between the per two adjacent gamps, wherein umbellule is used to the leakage distance that provides main, and gamp then works to prevent bridge joint between umbrella, prevents serious icing snowberg and retardance electric arc serial connection.The insulator of this beveled structure can be realized higher leakage distance, and greatly reduce the consumption of insulator full skirt material under the prerequisite that guarantees excellent resistant wet performance under given insulation distance.

A kind of umbrella structure of composite insulator that the present invention proposes, it is characterized in that, rearranged by the gamp of some equal diameters and the two or more umbellules between the per two adjacent gamps, said gamp and umbellule stretch out and are not less than 20 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters; The leakage distance that the leakage distance that is provided by umbellule provides greater than gamp; This composite insulator creep distance coefficient is more than or equal to 3.5 o'clock, and the gamp umbrella stretches out the ratio that the umbrella with umbellule stretches out and is not less than 1.5; If this composite insulator creep distance coefficient is less than 3.5 o'clock, the gamp umbrella stretches out the ratio that the umbrella with umbellule stretches out and is not less than 1.8.

The full skirt equal diameters of said composite insulator umbellule also can be unequal.

Umbrella structure of composite insulator of the present invention can be widely used in and exchange 110kV and above electric pressure, the composite rod insulator of direct current 100kV and above electric pressure, cross-arm composite insulator, post composite insulator, compound cover lightning arrester, Interphase Composite Spacer etc.

Characteristics of the present invention and effect:

The present invention provides the mentality of designing of main leakage distance to make the equivalent diameter of synthetic insulator obviously reduce by umbellule, and made full use of pollution flashover voltage and reduced to increase sharply with equivalent diameter, and the big more principle of the more little pollution flashover voltage increasing degree of equivalent diameter.Thereby guaranteed that composite insulator under the rigor condition that hydrophobicity completely loses, still has higher pollution flashover voltage level.When umbellule full skirt diameter reduced, adjacent umbrella spacing also can correspondingly reduce, and therefore can provide higher leakage distance in given insulation distance.Compare with the composite insulator of existing isometrical umbrella structure or big umbellule structure, under the identical leakage distance, the composite insulator of new beveled structure is owing to have littler equivalent diameter, improved the utilance of leakage distance, therefore provide higher pollution flashover voltage, and significantly reduced the consumption of full skirt material.There is the effect of the gamp of significant difference to be to prevent bridge joint between umbrella, prevents that serious icing snowberg and retardance electric arc are connected in series with the umbellule diameter, thereby guaranteed that this beveled structure insulator has excellent resistant wet performance.

In addition, because the little equivalent diameter of this structure insulator has limited the leakage current that flows through insulator, thereby help to delay the umbrella sheath material aging that leakage current causes under filthy and the moistening concurrent conditions.

Description of drawings

Fig. 1 is existing isometrical umbrella structure composite insulator schematic diagram.

Fig. 2 is existing big umbellule structure composite insulator schematic diagram.

Fig. 3 is the

full skirt

2 or 4 and the local enlarged diagram of sheath 3 among Fig. 1, Fig. 2.

Fig. 4 is umbrella structure of composite insulator embodiment one schematic diagram of the present invention.

Fig. 5 is umbrella structure of composite insulator embodiment two schematic diagrames of the present invention.

Fig. 6 umbrella structure of composite insulator embodiment three schematic diagrames of the present invention.

Fig. 7 umbrella structure of composite insulator embodiment four schematic diagrames of the present invention.

Embodiment the present invention designs four kinds of umbrella structure of composite insulator embodiment, is described in detail as follows in conjunction with each accompanying drawing:

Embodiment one: the composite insulator insulation distance is 5110 millimeters, and 18000 millimeters of leakage distances are rearranged by the gamp of 41 equal diameters and the umbellule of 3 equal diameters between the per two adjacent gamps, as shown in Figure 4.The full skirt diameter of all gamps is 160 millimeters, and the full skirt diameter of all umbellules is 100 millimeters.

This insulator gamp umbrella stretches out 65 millimeters, and the umbellule umbrella stretches out 35 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters.The leakage distance that umbellule provides accounts for 48% of insulator leakage distance, greater than gamp provide 30%.The creep distance coefficient of this insulator is 3.52, and its gamp umbrella stretches out 51, and to stretch out 52 ratio with the umbrella of umbellule be 1.86, greater than 1.5.

The composite insulator of this beveled structure can be used for direct current ± 500kV ultra-high-tension power transmission line.

Embodiment two: the composite insulator insulation distance is 5110 millimeters, 18000 millimeters of leakage distances, and the umbellule that is not waited by gamp and 3 diameters between the per two adjacent gamps of 41 equal diameters rearranges, as shown in Figure 5.The full skirt diameter of all gamps is 140 millimeters.In every group of 3 umbellules, the full skirt diameter of middle 1 umbellule is 120 millimeters, and the full skirt diameter of other 2 umbellules is 100 millimeters.

This insulator gamp umbrella stretches out 55 millimeters, and the umbellule umbrella that diameter is 120 millimeters stretches out 45 millimeters, and the umbellule umbrella that diameter is 100 millimeters stretches out 35 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters.The leakage distance that umbellule provides accounts for 53% of insulator leakage distance, greater than gamp provide 25%.The creep distance coefficient of this insulator is 3.52, and its gamp umbrella stretches out 51, and to stretch out 52 ratio with the umbrella of umbellule be 1.57, greater than 1.5.

The insulator of this beveled structure can be used for direct current ± 500kV ultra-high-tension power transmission line.

Embodiment three: the composite insulator insulation distance is 4130 millimeters, and 12717 millimeters of leakage distances are rearranged by the gamp of 22 equal diameters and the umbellule of 5 equal diameters between the per two adjacent gamps, as shown in Figure 6.The full skirt diameter of all gamps is 150 millimeters, and the full skirt diameter of all umbellules is 90 millimeters.

This insulator gamp umbrella stretches out 60 millimeters, and the umbellule umbrella stretches out 30 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters.The leakage distance that umbellule provides accounts for 53% of insulator leakage distance, provides 30% greater than gamp.The creep distance coefficient of this insulator is 3.08, and its gamp umbrella stretches out 51, and to stretch out 52 ratio with the umbrella of umbellule be 2.0, greater than 1.8.

The insulator of this beveled structure can be used for exchanging the 500kV ultra-high-tension power transmission line.

Embodiment four: the composite insulator insulation distance is 4130 millimeters, and 12717 millimeters of leakage distances are rearranged by the gamp of 44 equal diameters and 2 unequal umbellules of diameter between the per two adjacent gamps, as shown in Figure 7.The full skirt diameter of all gamps is 120 millimeters.The full skirt diameter of every group of 2 umbellules is respectively 100 millimeters, 80 millimeters.

This insulator gamp umbrella stretches out 45 millimeters, and the umbellule umbrella that diameter is 100 millimeters stretches out 35 millimeters, and the umbellule umbrella that diameter is 80 millimeters stretches out 25 millimeters, and the umbrella spacing all is not less than 25 millimeters.The leakage distance that umbellule provides accounts for 43% of insulator leakage distance, greater than gamp provide 32%.The creep distance coefficient of this insulator is 3.08, and its gamp umbrella stretches out 51, and to stretch out 52 ratio with the umbrella of umbellule be 1.80.

Claims

1, a kind of umbrella structure of composite insulator is rearranged by the gamp of some equal diameters and the two or more umbellules between the per two adjacent gamps, and said gamp and umbellule stretch out and be not less than 20 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters; The leakage distance that the leakage distance that is provided by umbellule provides greater than gamp is provided; This composite insulator creep distance coefficient is more than or equal to 3.5, and the gamp umbrella stretches out the ratio that the umbrella with umbellule stretches out and is not less than 1.5.

2, umbrella structure of composite insulator as claimed in claim 1 is characterized in that, the full skirt equal diameters of said umbellule.

3, umbrella structure of composite insulator as claimed in claim 1 is characterized in that, the full skirt diameter of said umbellule is unequal.

4, a kind of umbrella structure of composite insulator is rearranged by the gamp of some equal diameters and the two or more umbellules between the per two adjacent gamps, and said gamp and umbellule stretch out and be not less than 20 millimeters, and adjacent umbrella spacing all is not less than 25 millimeters; The leakage distance that the leakage distance that is provided by umbellule provides greater than gamp is provided; This this composite insulator creep distance coefficient is less than 3.5, and the gamp umbrella stretches out the ratio that the umbrella with umbellule stretches out and is not less than 1.8.

5, umbrella structure of composite insulator as claimed in claim 4 is characterized in that, the full skirt equal diameters of said umbellule.

6, umbrella structure of composite insulator as claimed in claim 4 is characterized in that, the full skirt diameter of said umbellule is unequal.