CN101227071A - 10kV distribution line insulation tower head - Google Patents

Abstract

An insulating tower head of a 10kV distribution line, which is characterized in that: a hydrophobic high-strength insulating rod is used, assembled with connecting fittings and pin insulators to form a whole insulating tower head; or a hydrophobic high-strength insulating rod is used directly Assemble with connecting fittings to form an insulating tower head as a whole. By adopting the invention, the insulation level of distribution lines can be greatly improved, the air gap for lightning discharge can be significantly increased, and the accident of disconnection due to lightning strike can be effectively prevented; Eliminate the occurrence of pollution flashover accidents; facilitate live-line work; simplify operating procedures and improve operating safety.

Description

10kV distribution line insulation tower head

technical field

The invention belongs to the field of high-voltage transmission lines, and relates to a 10kV power distribution line insulation tower head (a support for overhead wires).

Background technique

Compared with the insulation level of 110kV and above transmission lines, the creepage distance of insulators in 10kV distribution lines is small, and the air gap L ₁ (creep distance) between the charged body (conductor) and the grounding body (iron crossarm) is small, generally It is 20cm, once a direct lightning strike occurs, flashover is very easy to occur. In addition, some urban power grids are located in areas where the atmospheric environment is poor, and the insulators are heavily polluted. Pollution flashover is prone to occur in high humidity or foggy climates. In addition, when tree branches, streamers, kites, food bags and other sundries short-circuit the pin insulator, it is also easy to cause a phase-to-ground short circuit, and then develop into a phase-to-phase flashover after the healthy phase potential rises.

Compared with the "insulated cross arm" of application number 98229706.8, its design purpose is to improve the insulation level of the tower while ensuring the mechanical strength of the tower. It will not be able to maintain the fit and seal, and there will be gaps, and there will be dirt accumulation in the core rod and the insulating shed. When the climate is humid, the insulation level of this insulating cross-arm will be greatly reduced, and in severe cases, there will even be a relative short circuit. And the present invention is a whole, even if dirt such as dust gathers, but when there is wind or rainy weather, dirt can be blown away or washed away, thereby kept higher insulation level.

Contents of the invention

The purpose of the present invention is to provide a 10kV distribution line insulation tower head, which can solve the problems of lightning flashover, pollution flashover, phase-to-ground short circuit and phase-to-phase flashover that are easy to occur in the existing 10kV distribution line, and can greatly improve the power distribution line. The insulation level can basically completely eliminate the occurrence of pollution flashover accidents, and it is beneficial to carry out live work.

The technical solution of the present invention is: a 10kV distribution line insulating tower head, characterized in that: use hydrophobic high-strength insulating rods, assemble with connecting hardware and pin insulators to form a whole insulating tower head; or use hydrophobic Water-type high-strength insulating rods are directly assembled with connecting fittings to form an insulating tower head as a whole. As a result, the insulation distance between the tower head and the phase is greatly increased, and the insulation level of the distribution line is greatly improved.

The above-mentioned 10kV distribution line insulation tower head is characterized in that: pin insulators 1, 2, 3, connecting fittings 4, 5, 6, 7, 8, 9, 10 and hydrophobic high-strength insulating rods 11 , 12 components, the connecting fittings 4, 5, 6 are installed on the pin insulators 1, 2, 3 respectively, and there is a groove embedded in the wire at the upper end, and the connecting fittings 7, 8 respectively fix the pin insulators 1, 3 on On both ends of the insulating rod 11, the connecting fittings 9, 10 are used to fix the insulating rod 11 on the insulating rod 12, and the insulating rod 11 and the insulating rod 12 form a cross shape.

The above-mentioned 10kV distribution line insulation tower is characterized in that it is composed of connecting fittings 4, 5, 6, 9, 10 and hydrophobic high-strength insulating rods 11, 12, and the upper ends of the connecting fittings 4, 5, 6 are respectively There is a groove embedded in the wire, the connecting fittings 4 and 6 are fixed on both ends of the insulating rod 11, the connecting fittings 5 are fixed on the ends of the insulating rod 12, and the connecting fittings 9 and 10 are used to fix the insulating rod 11 on the insulation On the rod 12, the insulating rod 11 and the insulating rod 12 form a cross.

Beneficial effect

1. The present invention increases the relative ground insulation distance L ₁ and the interphase insulation distance (about 2L ₁ ), so that the air distance for lightning discharge (that is, the relative ground insulation distance L ₁ ) (as shown in Figure 1) is significantly increased, from The original 20cm is at least increased to about 90cm~110cm, the discharge path (wire to tower body, L ₁ +L ₂ ) is increased by 3 to 4 times, and the insulation level is increased to 110kV line level, making the insulation level higher than that caused by induction lightning. Formed overvoltage, thereby preventing lightning tripping and lightning disconnection accidents of insulated wires.

2. The invention significantly increases the creepage distance, so that the creepage distance in the dirty state is significantly increased by 20cm to at least 90cm, and its structure is easy to improve the self-cleaning ability, which can basically completely prevent the occurrence of pollution flashover accidents. In addition, when hanging sundries or small branches on the cross arm and the pole, it will basically not affect its normal operation.

3. Conducive to live work. At present, live work in urban distribution networks is more common. When replacing insulators, replacing cross arms, and moving poles, it is necessary to insulate and shield iron cross arms or towers and use insulating cross arms to transfer live bodies, so that the operating procedures are relatively The use of insulating tower heads not only helps to simplify the operation procedures, but also improves the safety of operations.

The invention has the advantages of light weight, high mechanical strength, strong hydrophobicity, adaptability to long-term outdoor climate environment, high insulation level, and fully meets the requirements of the insulation level of power distribution lines.

Description of drawings

Figure 1 is a schematic diagram of the existing tower head structure.

Fig. 2 is a schematic structural diagram of Embodiment 1 of the present invention.

specific implementation

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

In Figure 1, the components and labels are as follows: pin insulators X1, X2, X3; iron cross arm X4; tower body X5; relative ground insulation spacing L ₁ (20cm), L ₂ (70cm), L ₃ (90cm);

In Fig. 2, the components and marks are as follows: pin insulators 1, 2, 3, connecting fittings 4, 5, 6, 7, 8, 9, 10, and insulating rods 11, 12.

Referring to Fig. 2, the 10kV distribution line insulation tower head of embodiment 1 of the present invention, it is made of pin type insulators 1, 2, 3, fittings 4, 5, 6, 7, 8, 9, 10 and hydrophobic high-strength insulation Composed of rods 11 and 12, the connecting fittings 4, 5 and 6 are installed on the pin insulators 1, 2 and 3 respectively, with a groove on each upper end for embedding wires, and the connecting fittings 7 and 8 respectively connect the pin insulators 1 , 3 is fixed on the insulating rod 11, and the connecting fittings 9, 10 are used to fix the insulating rod 11 on the insulating rod 12. The insulation tower head is light in weight, high in mechanical strength, has strong water repellency, adapts to long-term outdoor climate environment, and has a high insulation level to fully meet the requirements of the insulation level of distribution lines.

The present invention can also have following optional scheme (embodiment 2):

Pin insulators 1, 2, 3 are not installed, and the wires are directly installed on the hydrophobic high-strength insulating rods 11, 12 with connecting fittings, which also have a large enough relative ground and interphase insulation spacing, which can ensure the height of the insulation level.

Claims (3)

1. An insulating tower head of a 10kV distribution line, characterized in that: a hydrophobic high-strength insulating rod is used, assembled with connecting fittings and pin insulators to form a whole insulating tower head; or a hydrophobic high-strength insulating rod is used The rod is directly assembled with the connecting hardware to form an insulating tower head as a whole. 2. The insulating tower head of 10kV distribution line as claimed in claim 1, characterized in that: by pin type insulators (1, 2, 3), connecting fittings (4, 5, 6, 7, 8, 9, 10) Composed of hydrophobic high-strength insulating rods (11, 12), the connecting fittings (4, 5, 6) are installed on the pin insulators (1, 2, 3), and each of the upper ends has a groove embedded in the wire. The fittings (7, 8) respectively fix the pin insulators (1, 3) on the two ends of the insulating rod (11), and the connecting fittings (9, 10) are used to fix the insulating rod (11) on the insulating rod (12). On, the insulating rod (11) and the insulating rod (12) become a cross. 3. The 10kV distribution line insulating tower head as claimed in claim 1, characterized in that: it consists of connecting fittings (4, 5, 6, 9, 10) and hydrophobic high-strength insulating rods (11, 12), The upper ends of the connecting fittings (4, 5, 6) each have a groove embedded in the wire, the connecting fittings (4, 6) are fixed on both ends of the insulating rod (11), and the connecting fittings (5) are fixed on the insulating rod (12) On the terminal, connecting fittings (9, 10) are used for fixing the insulating rod (11) on the insulating rod (12), and the insulating rod (11) and the insulating rod (12) form a cross.

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