CN207302760U - A kind of anti-icing anti-thunder insulator - Google Patents

Abstract

The utility model provides an anti-icing and lightning-proof insulator, which comprises a gap section, a first annular resistance sheet is arranged inside the first composite umbrella cover of the gap section, and a mandrel passes through a plurality of first annular resistance sheets. Center hole. By setting resistors in the gap section, the proportion of the voltage borne by the gap section is reduced, the maximum field strength of the insulator is further reduced, the ability of the insulator to deal with ice-covered flashover in heavily polluted areas is improved, and it is easy to meet the structural size requirements of the tower window, thereby Easy to install and save investment.

Description

An anti-icing and lightning-proof insulator

technical field

The utility model relates to the technical field of electrical engineering, in particular to an anti-ice and lightning-proof insulator.

Background technique

Insulators are special insulation controls that can play an important role in overhead transmission lines. In the early years, insulators were mostly used on utility poles, and gradually developed into a high-voltage wire connection tower with many disc-shaped insulators hanging on one end. It is used to increase the creepage distance, usually made of glass or ceramics, and is called an insulator.

Since power grid lines will extend to areas with complex terrain and cold climates, insulators are required to have anti-ice and lightning protection capabilities. The anti-icing and lightning protection insulators in the prior art generally adopt a structure in which a gap section and a lightning protection section are connected in series, so that the insulator has both the functions of a lightning arrester and an insulator. Insulators usually adopt the structure of oversized sheds to delay the ice bridging process of sheds in the ice-covered state. Ice and lightning protection insulators have been widely used in heavy ice areas due to their simple installation and low cost.

However, actual operating experience shows that icing will distort the electric field around the insulator, and in severe cases, it will lead to ice-covered flashover accidents of insulators, threatening the normal and stable operation of the power system. However, 95% of the power frequency voltage of traditional anti-ice and lightning protection insulators is applied to the gap section during normal operation. The fault of icing flashover occurs; in addition, in order to adapt to the size of the existing 500kV transmission line tower, the ability to deal with icing flashover cannot be improved by lengthening the gap section.

Utility model content

Aiming at the defect that existing anti-icing and lightning protection insulators are prone to icing flashover in heavily polluted areas and under severe ice-covering conditions, and the structural length of the anti-icing and lightning protection insulator cannot be increased in order to meet the window size requirements, the utility model provides An anti-ice and lightning-proof insulator.

The anti-icing and lightning protection insulator provided by the utility model includes a gap section, the first composite umbrella cover of the gap section is provided with a first annular resistor, and the mandrel passes through a plurality of central holes of the first annular resistor .

The insulator also includes: an upper equalizing ring and a lower equalizing ring; the upper equalizing ring is located above the first composite shed, and the upper equalizing ring is connected to the core through an upper equalizing ring connecting rod. Rod connection, and the upper pressure equalizing ring is a double-ring structure; the lower pressure equalizing ring is located below the first composite umbrella cover, and the lower pressure equalizing ring is connected to the mandrel through the lower pressure equalizing ring connecting rod .

Wherein, the upper pressure equalizing ring includes an upper ring, a lower ring and a connecting bracket, the upper ring and the lower ring are arranged in parallel up and down, and the upper ring and the lower ring are connected by the connecting bracket.

The insulator also includes an arc striking angle, and the arc striking angle is arranged at the lower end of the upper voltage equalizing ring and the upper end of the lower voltage equalizing ring.

The insulator also includes a lightning protection section located above the gap section, a sleeve is arranged inside the second composite sheath of the lightning protection section, and a second annular resistance sheet is arranged inside the sleeve and a The spring on the upper part of the resistance sheet, the mandrel passes through a plurality of central holes of the second annular resistance sheet.

The insulator also includes an upper end cap disposed on the upper end of the sleeve and a lower end cap disposed on the lower end of the sleeve.

The insulator also includes a bowl fitting arranged at the upper end of the mandrel and a ball fitting arranged at the lower end of the mandrel.

Wherein, the first composite umbrella cover and the second composite umbrella cover have shed skirt strings with different umbrella diameters and staggered layers.

Wherein, the first annular resistance sheet and the second annular resistance sheet are annular zinc oxide valve sheets.

Wherein, the upper pressure equalizing ring and the lower pressure equalizing ring are made of aluminum, and the arc striking angle is respectively connected to the upper pressure equalizing ring and the lower pressure equalizing ring through aluminum welding.

The anti-icing and lightning-proof insulator provided by the utility model reduces the proportion of the voltage borne by the gap section by arranging a resistor in the gap section, further reduces the maximum field strength of the insulator, and improves the ability of the insulator to deal with ice-covered flashover in heavily polluted areas , and it is easy to meet the structural size requirements of the tower window, so that the installation is simple and the investment is saved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appended drawings in the following description The drawings show some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is a schematic structural diagram of an anti-icing and lightning-proof insulator provided by an embodiment of the present invention.

In the figure, 1: Bowl head fittings; 2: Sleeve; 3: The first composite umbrella cover; 4: Upper pressure equalizing ring connecting rod; 5: Lower pressure equalizing ring; 6: Ball head fittings; 7: Upper end cover; 8 : spring; 9: mandrel; 10: first ring resistor; 11: upper equalizing ring; 12: arc angle; 13: lower equalizing ring connecting rod; 14: second annular resistor; 15: second Composite umbrella cover; 16: lower end cover.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described implementation Example is a part of embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the following, the embodiment of the utility model will be described by taking the anti-icing and lightning protection insulators of 500kV high-voltage transmission lines suitable for thunderstorm areas as an example, but the protection scope of the embodiments of the utility model is not limited thereto; for the convenience of description, the following uses "Insulator" means "anti-ice and lightning protection insulator".

Fig. 1 is a schematic structural view of the anti-icing and lightning protection insulator provided by the embodiment of the utility model. As shown in Fig. 1, the insulator includes a gap segment, and the first composite umbrella cover 3 of the gap segment is provided with a first annular resistance piece inside 10 , the mandrel 9 passes through the central holes of the plurality of first annular resistor sheets 10 .

Among them, the anti-ice and lightning protection insulators are installed on the poles and towers, and are used to suspend the transmission wires; the gap section is a part of the insulator, which is used for insulation, and can also be called an insulation section; the composite umbrella cover is usually made of kneaded insulating rubber It is vulcanized by rubber through a special mold, which can be a hollow cylinder to protect the mandrel; the mandrel is the bearer of the tensile effect during the operation of the insulator; the ring-shaped resistor can be made of metal oxide The annular structure has good heat dissipation performance.

Specifically, in the insulator provided by the embodiment of the present invention, the gap section includes the first composite shed 3 and the first annular resistance piece 10, the mandrel 9 passes through the inside of the first composite shed 3 coaxially, and the core The rod 9 is coaxially covered with a plurality of first ring-shaped resistors 10 stacked so that the mandrel 9 , the first composite shed 3 and the first ring-shaped resistors 10 are coaxial. The first annular resistor 10 can fill the gap between the mandrel 9 and the first composite shed 3 , so that the first annular resistor 10 can be fixed.

During the use of traditional insulators, when the line is in normal operation, the insulator suspends the transmission wire and maintains good insulation between the wire and the ground, and most of the operating voltage of the line is borne by the gap section. In the insulator provided by the embodiment of the present invention, since the first annular resistor 10 is added to the gap section, compared with the traditional insulator, the voltage ratio of the gap section is lower, thereby reducing the overall maximum field strength of the insulator. Since the greater the maximum field strength of the insulator, the more likely the icing flashover fault will occur, so the insulator provided by the embodiment of the utility model can reduce the risk of the icing flashover of the insulator to a certain extent.

The anti-icing and lightning-proof insulator provided by the embodiment of the utility model reduces the proportion of the voltage borne by the gap section by arranging a resistor in the gap section, further reduces the maximum field strength of the insulator, and improves the insulator's ability to cope with ice-covered flashover in heavily polluted areas. The ability, and easy to meet the structural size requirements of the tower window, so easy to install and save investment.

Based on the above embodiment, it also includes an upper equalizing ring 11 and a lower equalizing ring 5; the upper equalizing ring 11 is located above the first composite umbrella cover 3, and the upper equalizing ring 11 passes through the upper equalizing ring The connecting rod 4 is connected to the mandrel 9, and the upper pressure equalizing ring 11 is a double-ring structure; the lower pressure equalizing ring 5 is located below the first composite umbrella cover 3, and the lower pressure equalizing ring 5 passes through The lower equalizing ring connecting rod 13 is connected with the mandrel 9 .

Among them, since the ground capacitance of the composite insulator is small and the voltage distribution is uneven, it is necessary to install a voltage equalizing ring to make the voltage distribution of the insulator more uniform; The network occurs between the two rings to protect the surface of the umbrella skirt from being burned.

Specifically, an upper equalizing ring 11 can be installed on the top of the gap section, that is, above the first composite umbrella cover 3, and the upper equalizing ring 11 is connected to one end of the upper equalizing ring connecting rod 4, and the upper equalizing ring connecting rod 4 The other end of the other end is connected with the mandrel 9; in the bottom of the gap section, that is, the lower equalizing ring 5 can be installed under the first composite umbrella cover 3, and the lower equalizing ring 5 is connected with one end of the lower equalizing ring connecting rod 13. The other end of the equalizing ring connecting rod 13 can be connected with the mandrel 9 through the bottom plate.

Based on the above embodiment, the upper pressure equalizing ring 11 includes an upper ring, a lower ring and a connecting bracket, the upper ring and the lower ring are arranged in parallel up and down, and the upper ring and the lower ring pass through the connecting bracket connect. Specifically, the upper pressure equalizing ring 11 is a double-ring structure, including an upper ring and a lower ring. The upper ring and the lower ring are arranged in parallel in two layers, connected and fixed by connecting brackets.

Based on the above embodiment, the insulator further includes an arc striking angle 12 , and the arc striking angle 12 is arranged at the lower end of the upper voltage equalizing ring 11 and the upper end of the lower voltage equalizing ring 5 . Among them, the arcing angle 12 is an effective lightning protection component, which can not only ground the lightning current in time, but also provide uninterrupted power supply to the user, so as to prevent flashover on the surface of the insulator, protect electrical equipment and maintain the normal operation of the line.

Specifically, for the traditional 500kV anti-icing and lightning protection insulators in the power frequency withstand voltage test, the partial discharge phenomenon that occurs at the lower end of the gap section and the connection between the lightning protection section and the gap section, the embodiment of the utility model improves the 500kV anti-icing and lightning protection insulator structure. The upper equalizing ring 11 adopts a double-ring structure, and at the same time, an arc angle 12 is added to the lower end of the upper equalizing ring 11 and the upper end of the lower equalizing ring 5, which further uniforms the electric field in the high field strength area and fixes the discharge path, thereby Increased power frequency breakdown flashover voltage.

Based on the above embodiment, the insulator also includes a lightning protection section located above the gap section, a sleeve 2 is arranged inside the second composite sheath 15 of the lightning protection section, and a second ring resistor is arranged inside the sleeve 2 sheet 14 and the spring 8 located on the upper part of the second annular resistor sheet 14, the mandrel 9 passes through a plurality of central holes of the second annular resistor sheet 14. Specifically, when a thunderstorm occurs and the voltage generated by lightning breaks through the gap, the second annular resistor 14 can absorb the impact energy to clamp the overvoltage, thereby protecting the entire insulator from flashover and preventing line tripping accidents.

Based on the above embodiment, the insulator further includes an upper end cap 7 disposed on the upper end of the sleeve 2 and a lower end cap 16 disposed on the lower end of the sleeve 2 . Wherein, the upper end cap 7 and the lower end cap 16 are used to seal the sleeve 2 .

Based on the above embodiment, the insulator further includes a bowl fitting 1 arranged at the upper end of the mandrel 9 and a ball fitting 6 arranged at the lower end of the mandrel 9 . Among them, the bowl fitting 1 of the lightning protection section and the ball fitting 6 of the gap section are used to connect the insulator with other components in the power line.

Based on the above-mentioned embodiment, the first composite umbrella cover 3 and the second composite umbrella cover 15 have shed strings with different diameters and staggered layers. Specifically, when the insulator encounters rainy, snowy and freezing weather, the above-mentioned composite shed with different shed diameters and staggered shed strings can play a good shielding effect on the small sheds, thereby It can prevent bridging between umbrellas, prevent severe ice and snow, and block arc series connection, thereby effectively delaying the ice bridging time of the insulator, increasing the difficulty of flashover, and greatly reducing the probability of line tripping in freezing weather.

Based on the above embodiment, the first annular resistor 10 and the second annular resistor 14 are annular zinc oxide valve plates. The annular zinc oxide valve plate has excellent performance and good heat dissipation performance.

Based on the above embodiment, the upper equalizing ring 11 and the lower equalizing ring 5 are made of aluminum, and the arcing angle 12 is welded to the upper equalizing ring 11 and the lower equalizing ring 5 respectively through aluminum welding. connect. Among them, the preferred material of the upper pressure equalizing ring 11 and the lower pressure equalizing ring 5 is aluminum or aluminum alloy.

The following examples illustrate the composition of each part of the insulator provided by the above embodiments, but the scope of the embodiments of the present invention is not limited thereto. Bowl head fittings 1, upper pressure equalizing ring connecting rod 4, lower pressure equalizing ring 5, upper end cover 7 and upper pressure equalizing ring 11 may be iron galvanized parts; bowl head fittings 1 of lightning protection section and ball head fittings of gap section 6. It can adopt the structure type of foot ball and cap socket, and press it on the end of the anti-ice and lightning protection insulator mandrel 9 through the stress such as the center of the arc surface; the upper pressure equalizing ring 11 is fixed on the mandrel 9 through the upper pressure equalizing ring connecting rod 4; Annular resistance sheet 10 can adopt annular zinc oxide valve sheet; Sleeve 2 of lightning protection section can adopt epoxy glass fiber cylinder; Mandrel 9 is high-strength corrosion-resistant epoxy glass fiber rod; The second composite umbrella cover 15 is made of high-temperature vulcanized silicone rubber with methyl vinyl silicone rubber added with compounding agent. All the above-mentioned components can be purchased in the market or processed by domestic manufacturers. According to the above-mentioned specific implementation method, and referring to the structure shown in Figure 1 for assembly, an insulator that meets the conditions of use can be obtained.

Table 1 The effect of the diameter of the gap segment resistor on the field intensity distribution

Table 1 shows the impact of the diameter of the gap segment resistance sheet on the field intensity distribution, wherein the gap segment of the traditional insulator has no resistance sheet, and its diameter of the resistance sheet is 0; the insulator provided by the embodiment of the utility model is a new type of insulator, as shown in Table 1 Five sets of data with the diameter of the gap segment resistors ranging from 20mm to 100mm were obtained. Among them, when the diameter of the resistive piece of the gap section is 40mm, compared with the traditional insulator, the voltage ratio of the gap section is reduced from 90% to 62%, and the maximum field strength is reduced from 30.5kV/cm to 19.8kV/cm. At this time, the lightning protection section The shared voltage is 38%, and the voltage borne by the lightning protection section is more reasonable.

Therefore, after adopting this structure, the proportion of the voltage borne by the gap segment is reduced. The traditional 500kV anti-icing and lightning protection insulators and the new 500kV anti-icing and lightning protection insulators bear voltages of 495kV and 341kV respectively. Since the breakdown voltage is positively correlated with the length, when the voltage borne by the gap section is reduced, it can be considered to further reduce the overall structural height of the anti-icing and lightning-proof insulator, and reduce the structural length of the 500kV anti-icing and lightning-proof insulator to less than 4.8m to meet the Window size requirements.

In summary, the anti-icing and lightning-proof insulator provided by the embodiment of the utility model is used for suspending transmission wires, and can bear a relatively large load; compared with the traditional 500kV anti-icing and lightning-proof insulator, the embodiment of the utility model provides The voltage borne by the gap section of the anti-icing and lightning-proof insulator is reduced by 1/3, and the maximum field strength is reduced by 1/3, thereby improving the ability of the 500kV transmission line to deal with icing flashover, pollution flashover and lightning tripping faults, and improving The flashover voltage is reduced; the insulator adopts a double-ring structure and an arc angle design, and the field strength distribution in the local high field strength area is evenly arranged, which limits the discharge path and protects its shed from arc burns, and the insulation strength is not affected after lightning strikes; the gap After the voltage ratio borne by the section is reduced, the structural height of the 500kV ice and lightning protection insulator can be further reduced, and the window size requirements can be further met; the insulating jacket of the ice and lightning protection insulator adopts a rich umbrella structure and a staggered way of large and small umbrella skirts, which can Realize the anti-icing flash function in low temperature, rain, snow and freezing weather.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (10)

1. An ice and lightning protection insulator, characterized in that it comprises a gap section, the first composite umbrella cover of the gap section is provided with a first annular resistor, and the mandrel passes through a plurality of the first annular resistors center hole. 2. The insulator according to claim 1, further comprising: an upper grading ring and a lower grading ring; The upper equalizing ring is located above the first composite umbrella cover, the upper equalizing ring is connected to the mandrel through the upper equalizing ring connecting rod, and the upper equalizing ring is a double-ring structure; The lower pressure equalizing ring is located below the first composite umbrella cover, and the lower pressure equalizing ring is connected to the mandrel through a lower pressure equalizing ring connecting rod. 3. The insulator according to claim 2, wherein the upper equalizing ring comprises an upper ring, a lower ring and a connecting bracket, the upper ring and the lower ring are arranged in parallel up and down, and the upper ring and the lower ring The lower ring is connected through the connecting bracket. 4. The insulator according to claim 2 or 3, further comprising an arc striking angle, the arc striking angle being set at the lower end of the upper equalizing ring and the upper end of the lower equalizing ring. 5. The insulator according to claim 1, further comprising a lightning protection section located above the gap section, a sleeve is arranged inside the second composite sheath of the lightning protection section, and a sleeve is arranged inside the sleeve The second annular resistance sheet and the spring located on the upper part of the second annular resistance sheet, the mandrel passes through a plurality of central holes of the second annular resistance sheet. 6. The insulator according to claim 5, further comprising an upper end cap disposed on the upper end of the sleeve and a lower end cap disposed on the lower end of the sleeve. 7. The insulator according to claim 1 or 5, characterized in that it further comprises a bowl-end fitting arranged at the upper end of the mandrel and a ball-end fitting arranged at the lower end of the mandrel. 8 . The insulator according to claim 5 , wherein the first composite shed and the second composite shed have shed strings with different shed diameters and stacked alternately. 9. The insulator according to claim 5, characterized in that, the first annular resistor and the second annular resistor are annular zinc oxide valve plates. 10. The insulator according to claim 4, characterized in that, the upper voltage equalizing ring and the lower voltage equalizing ring are made of aluminum, and the arc striking angle is respectively connected to the upper voltage equalizing ring and the lower voltage equalizing ring through aluminum welding. The equalizing ring connection is described below.