WO2014086314A1

WO2014086314A1 - Novel strong wind resisting-type composite insulator applied to strong wind regions

Info

Publication number: WO2014086314A1
Application number: PCT/CN2013/088779
Authority: WO
Inventors: 孟岩; 贾志东; 张振泉; 关志成; 朱正一; 李吉文; 王希林; 钟明亮; 马国祥; 许建; 陈先勇; 付豪; 王胜; 张燕春; 张博
Original assignee: 新疆电力公司; 清华大学深圳研究生院; 新疆维吾尔自治区送变电工程公司
Priority date: 2012-12-06
Filing date: 2013-12-06
Publication date: 2014-06-12
Also published as: CN203085296U

Abstract

An insulator is mainly applied to regions having a local highest wind speed higher than 30 m/s and is capable of maintaining the stability of umbrella skirts (1) under strong winds and preventing the occurrence of substantial swinging of the umbrella skirts (1). The insulator is characterized in that upper and lower surfaces of the umbrella skirts (1) are structurally symmetric; chamfers at the contacting places of the root portions of the umbrella skirts (1) and a sheath (2) are relatively large in radius; and the umbrella diameter and the umbrella thickness are related. The structure of the insulator is capable of guaranteeing the reasonable creep distance and umbrella separation distance, and ensuring the pollution flashover resisting property. The main effects of the insulator are that the insulator can be used in the strong wind regions; the local structures of the umbrella skirts (1) have a capability of preventing fluid from exciting vibrations; the problem of substantial swinging of the umbrella skirts (1) is eliminated; the problem of slight vibrations of the edges of the umbrella skirts (1) is alleviated; the stress concentration degree in the root portions of the umbrella skirts (1) is lowered down; and the capability of the insulator for resisting faults of tearing of the umbrella skirts (1) under the strong winds is effectively increased.

Description

New anti-high wind type composite insulator used in windy area

The invention relates to a composite insulator product for a high voltage transmission line.

Background technique

The safe operation of EHV transmission lines maintains the stability of the entire regional power grid. Composite insulators are the key equipment for transmission lines, and their reliability is critical to the entire power grid. Transmission lines complete power transmission between different regions, and need to pass through various geographical environments and harsh climates. The windy environment in northwestern China is a severe test for high-voltage transmission. Statistics show that there are local windy environments in Xinjiang, Gansu and Mongolia, such as various types of estuaries, valleys and Gobi. In some areas of this type of environment, there is a maximum wind speed exceeding 30m/s. The windy weather has a great impact on the high-voltage transmission lines that lead to the area, especially for the composite insulators of important equipment on the transmission line. The umbrella skirt will appear sharp under strong winds. Swing phenomenon. In recent years, in the ultra-high voltage transmission lines partially adopting such environments, a large-scale composite insulator rug has been found to be torn and detached, and the problem is on the rise.

Ordinary composite insulators do not take into account the wind resistance of the shed during the structural design process. Composite insulators made of elastomeric silicone rubber (umbrella skirt/sheath) Under high wind speed airflow, the skirt will have edge vibration or even a large swing problem. The deformation of the large swing will lead to stress concentration at the root of the umbrella skirt, and periodicity. The stress concentration causes the performance of the silicone rubber material in the root to decrease (the fatigue resistance of the electrical silicone rubber is poor), which further causes cracks in the root of the shed and tears through the surface, which eventually leads to the fall of the shed. Therefore, ordinary composite insulators that have not been designed for wind resistance should be placed in the windy area, and the reliability of long-term operation is a major question. Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems and to provide a novel anti-strong wind type composite insulator which is applied to a windy area, and which can ensure the stability of a single-piece shed structure when the wind speed is not higher than 50 m/s.

The technical solution adopted by the present invention to solve the technical problem thereof is to propose a novel anti-high wind composite insulator applied to a windy region, which is characterized in that: a. the composite insulator has a symmetrical structure on the upper and lower surfaces of the umbrella skirt - b. the composite insulator umbrella The chamfering radius (r) at the contact point between the skirt and the sheath is not less than 10 mm; c The diameter of the composite insulator shed has the following correlation with the thickness of the base of the umbrella and the angle of the upper T-shaped umbrella: the thickness of the shed skirt + the diameter of the shed skirt diameter ) xtan (the angle between the upper and lower surfaces of the shed is /2) ≥ 12 mm; the diameter of the shed (D) is not more than 200 mm; the thickness of the rim (t) is not less than 4 mm; the angle between the upper and lower surfaces of the shed (α) is not less than 7°. The invention has the beneficial effects that the wind resistance of the composite insulator is enhanced, the large vibration problem of the shed is effectively suppressed, and the material fatigue tearing failure of the shed skirt is ensured, and the composite insulator can ensure sufficient Creepage distance ensures safe operation of the transmission line.

DRAWINGS

Figure la, l b > lc is the partial structure of the insulator shed _ three directions schematic view.

Figure 2a is a schematic view of the overall structure of the anti-high wind composite insulator of the equal-diameter umbrella structure.

Figure 2b is a schematic view showing the overall structure of the anti-high wind composite insulator of the non-equal diameter umbrella structure.

3a and 3b are schematic diagrams showing the connection of an insulator and a metal fitting according to an embodiment of the present invention.

detailed description

The practical experience of composite insulators in the windy area shows that the common composite insulator structure does not have wind resistance, and the fatigue resistance of the silicone rubber material is poor. The long-term operation of the shed has a high probability of tearing and falling off. The present embodiment designs a novel insulator structure in which the composite insulator umbrella skirt can withstand a wind speed of up to 50 m/s without the large swing of the umbrella skirt, thereby ensuring the safety of the umbrella skirt without causing root cracks and shed skirting problems. The following embodiments of the present invention do not have the above problems.

Embodiment 1: As shown in FIG. 1 (this is the main part of the insulator, there are connecting fittings at both ends, but it is not related to this patent, the schematic diagram is shown in Figures 3a and 3b), and the upper and lower surfaces of the shed are used in the symmetrical form. Reduce the force difference of the shed in different insulator placement modes; control the hem angle of the shed 1 and the sheath 2 to be no less than 10 mm to ensure that the root stress concentration is small when the shed is deformed. The diameter of the umbrella D (the diameter of the shed) is not more than 200 mm to ensure that the wind area of the single shed is reduced and the hydrostatic pressure is reduced. The thickness of the shed is not less than 4 mm to improve the vibration of the shed. Ability; control the diameter of the umbrella, the thickness of the shed skirt, and the angle between the upper and lower surfaces of the shed to ensure the static stiffness of the shed and improve the overall wind resistance of the shed. Figure: I is a mandrel in I.

This design mainly controls the local hook of the insulator shed; for the overall structure of the insulator, the local hook meets the parameter control range, which can be an equal-diameter umbrella or a non-equal diameter umbrella structure, as shown in Figure 2a and Figure 2b. Show. In Fig. 2, the inside is a cylindrical mandrel 3, the outer part is a silicone rubber sheath, and the disk shape is an umbrella skirt. Umbrella skirt has a semi-circular edge.

Embodiment 2: The difference between this embodiment and the first embodiment is that, in the first embodiment, regarding the parameter constraint, only the one-sided condition is specified, because the better the effect is on the other side, the other side condition is not constrained. . In the present embodiment, from the perspective of the actual point, the other side constraint condition is specified. Therefore, in this example: the diameter of the shed is not more than 200 mm, not less than 120 mm; the thickness of the shed skirt is not less than 4 mm, More than 10 mm; the upper and lower surfaces of the shed are not less than 7° and not more than 16°.

Fig. 3 is a schematic view showing the mounting structure of the insulator of the present invention: 10 is an insulator, and 4 is a pressure equalizing ring and a metal fitting. Composite insulators are used in high-voltage transmission lines, with the upper end connected to the tower and the lower end suspending the conductor.

Claims

1. A new type of strong wind resistant composite insulator used in windy areas. Its characteristics are:

a. The upper and lower surfaces of the composite insulator shed have a symmetrical structure:

b. The chamfer radius (!■) of the contact point between the composite insulator shed and the sheath shall not be less than 0 mm;

c The composite insulator umbrella skirt diameter has the following correlation with the thickness of the umbrella root and the angle between the upper and lower umbrellas:

The edge thickness of the shed + (the diameter of the shed - the diameter of the sheath) xtan (the angle between the upper and lower surfaces of the shed / 2) ≥ 12 mm; the diameter of the shed (D) does not exceed 200 mm;

The edge thickness (t) of the shed is not less than 4 mm;

The angle between the upper and lower surfaces of the umbrella skirt (α) is not less than 7. .

2. The new type of strong wind resistant composite insulator used in windy areas as claimed in claim 1, characterized by - the composite insulator ensures that the vibration amplitude of the shed edge does not exceed

3. The new type of strong wind resistant composite insulator used in windy areas as claimed in claim 1, characterized by - the diameter of the shed is not less than 120 mm, the edge thickness of the shed is not more than 0 mm, and the angle between the upper and lower surfaces of the shed is not more than 16°.