CN209895846U - Gradient sectional type composite insulator structure and high-voltage insulating subsystem - Google Patents

Abstract

The utility model belongs to the technical field of transmission line insulation structure, a gradient sectional type composite insulator structure and a high-voltage insulator system are disclosed, wherein a pole tower side composite insulator and a wire side composite insulator which are connected by a metal connecting piece are arranged, and composite insulating material layers are coated on the outer sides of the pole tower side composite insulator and the wire side composite insulator; the relative dielectric constant of the composite insulator on the pole tower side is between 3 and 5, and the relative dielectric constant of the composite insulator on the lead side is between 100 and 120. The purpose of uniform electric field is achieved through the rule that the potential distribution changes along with the relative dielectric constant, the uniformity of the 330kV sectional type composite insulator can be effectively improved, the voltage born on the two sections of composite insulators is close, the aging rate is close, the service life of the composite insulator is prolonged, and the voltage born on the insulator on the wire side is reduced and the voltage born on the tower side is increased through the gradient regulation effect of the relative dielectric constant.

Description

A gradient segmented composite insulator structure and high-voltage insulator subsystem

technical field

The utility model belongs to the technical field of transmission line insulation structures, in particular to a gradient segmented composite insulator structure and a high-voltage insulator subsystem.

Background technique

Currently, the closest existing technology in the industry:

In recent years, composite insulators for transmission lines have appeared in segmented composite insulator structures, that is, two sections of composite insulators are assembled together to form a series of composite insulators. The structure and performance of the upper and lower composite insulators in this structure are exactly the same. During the operation of the insulator hanging on the grid, due to the influence of stray capacitance, the potential distribution of the 330kV segmented composite insulator is not uniform. A section of the composite insulator on the wire side bears a higher voltage, while the composite insulator on the tower side bears a lower voltage. As a result, the composite insulator on the wire side ages faster, which is not conducive to the safe and stable operation of the transmission line.

To sum up, the problems existing in the prior art are:

During the operation of the insulator on the grid, due to the influence of stray capacitance, the potential distribution of the 330kV segmented composite insulator is not uniform, resulting in a faster aging speed of the composite insulator on the wire side, which is not conducive to the safe and stable operation of the transmission line.

The difficulty of solving the above technical problems:

1. It is necessary to accurately establish the 330kV segmented insulator model;

2. It is necessary to accurately obtain the potential distribution of 330kV segmented insulators;

3. It is necessary to simulate and calculate a large number of insulators with different dielectric constants on the wire side respectively to obtain the potential distribution and the relative dielectric constant when the insulators on the tower side are close.

The significance of solving the above technical problems:

It can make the potential distribution of 330kV segmented composite insulators uniform, balance the aging speed of the composite insulators on the wire side and the tower side, reduce the phenomenon that one insulator is damaged and the other is intact, thereby effectively improving the service life of the two-section insulator.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a gradient segmented composite insulator structure.

The utility model is realized in this way, the gradient segmented composite insulator structure is provided with:

composite insulator;

The composite insulator is provided with two sections in total, and the two sections are connected by metal connectors.

Further, the composite insulator includes a tower-side composite insulator and a wire-side composite insulator, and the tower-side composite insulator and the wire-side composite insulator are respectively connected to two ends of the metal connector.

Further, the outer sides of the tower-side composite insulator and the wire-side composite insulator are coated with a composite insulating material layer.

Further, the relative permittivity of the tower-side composite insulator is between 3 and 5, and the relative permittivity of the wire-side composite insulator is between 100 and 120.

Another object of the present invention is to provide a high-voltage insulator subsystem equipped with the gradient segmented composite insulator structure.

To sum up, the advantages and positive effects of the present utility model are:

By combining two sections of composite insulators with the same structure and different relative permittivity to form a segmented insulator, the purpose of a uniform electric field is achieved through the law of the potential distribution changing with the relative permittivity, which can effectively improve the 330kV segmented composite insulator. Uniformity, so that the voltages on the two composite insulators are similar, so the aging rate is similar, and the life of the composite insulators is improved. Through the gradient adjustment of the relative permittivity, the voltage on the insulator on the wire side becomes lower, and the voltage on the tower side becomes higher. .

Description of drawings

1 is a schematic structural diagram of a gradient segmented composite insulator provided by an embodiment of the present invention;

In the figure: 1. Composite insulator on tower side; 2. Composite insulator on wire side; 3. Metal connector.

Detailed ways

In order to further understand the inventive content, features and effects of the present utility model, the following embodiments are exemplified and described in detail with the accompanying drawings as follows.

As shown in FIG. 1 , the gradient segmented composite insulator structure provided by the embodiment of the present invention includes: a tower-side composite insulator 1 , a wire-side composite insulator 2 , and a metal connector 3 .

The tower-side composite insulator 1 and the wire-side composite insulator 2 are connected by metal connectors 3, and the outside of the tower-side composite insulator 1 and the wire-side composite insulator 2 are coated with a composite insulating material layer; the tower-side composite insulator 1 and the wire-side composite insulator The dielectric constants of the insulators 2 are different.

Preferably, the relative permittivity of the tower-side composite insulator 1 is between 3 and 5, and the relative permittivity of the conductor-side composite insulator 2 is between 100 and 120.

Another object of the present invention is to provide a high-voltage insulator subsystem equipped with the gradient segmented composite insulator structure.

The working principle of the utility model is:

The utility model is composed of two sections of composite insulators, and the two sections are connected by a metal connecting piece 3 . The external insulation of the two insulators is mainly composite insulating material, and its relative dielectric constant is between 3 and 5. A segmented insulator is formed by combining two composite insulators with the same structure and different relative permittivity. The wire-side composite insulator 2 uses a modified composite insulating material to ensure that its relative permittivity is between 100 and 120. The composite insulating material of the composite insulator 1 on the tower side remains unchanged, and its relative permittivity is between 3 and 5. The purpose of a uniform electric field is achieved through the law of the potential distribution changing with the relative permittivity.

The above is only the preferred embodiment of the present utility model, and is not intended to limit the present utility model in any form. Any simple modifications made to the above embodiments according to the technical essence of the present utility model are equivalent to changes and modifications. All belong to the scope of the technical solution of the present invention.

Claims (3)

1. a gradient segmented composite insulator structure, is characterized in that, described gradient segmented composite insulator structure is provided with: composite insulator; The composite insulator is provided with two sections, and the two sections are connected by metal connectors; The composite insulator includes a tower-side composite insulator and a wire-side composite insulator, and the tower-side composite insulator and the wire-side composite insulator are respectively connected at both ends of the metal connector; The relative permittivity of the tower-side composite insulator is between 3 and 5, and the relative permittivity of the wire-side composite insulator is between 100 and 120. 2 . The gradient segmented composite insulator structure according to claim 1 , wherein the outer sides of the tower-side composite insulator and the wire-side composite insulator are coated with a composite insulating material layer. 3 . 3. A high-voltage insulator subsystem installed with the gradient segmented composite insulator structure according to any one of claims 1 to 2.

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