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Umbrella skirt structure for improving electric field distribution of composite insulator

A technology of composite insulators and insulator sheds, which is applied in the direction of insulators, circuits, electrical components, etc., can solve the problem of uneven electric field distribution of composite insulators, achieve the effect of solving uneven electric field distribution and improving the compressive strength

Pending Publication Date: 2019-04-12
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a shed structure and method for improving the electric field distribution of composite insulators, which can effectively solve the problem of uneven electric field distribution of composite insulators and improve the compressive strength of insulators

Method used

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  • Umbrella skirt structure for improving electric field distribution of composite insulator
  • Umbrella skirt structure for improving electric field distribution of composite insulator
  • Umbrella skirt structure for improving electric field distribution of composite insulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Fig. 1(a) is a schematic diagram of the shed structure for improving the electric field distribution of the composite insulator with only one shed in a single equal part.

[0088] Figure 2(a) ~ Figure 2(d) It is a schematic flowchart of a method for improving the electric field distribution of a composite insulator with only one shed in a single equal portion. First, the length of the composite insulator string is determined according to the voltage level of the transmission line; in the case of no shed, the distribution of the electric field intensity E on the surface of the core rod of the composite insulator in the axial direction is calculated by establishing a two-dimensional axisymmetric electrostatic field finite element model, as shown in Fig. 2(a); the insulator string is divided into 11 equal parts along the axial direction, and each equal part is recorded as a cycle, as shown in Fig. 2(b); the line integral of the electric field intensity E in each cycle is c...

Embodiment 2

[0090] Fig. 1(b) is a schematic diagram of the structure of sheds with the same inner shed diameter in one equal part to improve the electric field distribution of the composite insulator.

[0091] Figure 3(a) ~ Figure 3(d) It is a schematic flowchart of a method for improving the electric field distribution of a composite insulator with the same inner shed diameter in one equal portion. First, the length of the composite insulator string is determined according to the voltage level of the transmission line; in the case of no shed, the distribution of the electric field intensity E on the surface of the core rod of the composite insulator in the axial direction is calculated by establishing a two-dimensional axisymmetric electrostatic field finite element model, as shown in Fig. 3(a); the insulator string is divided into 11 equal parts along the axial direction, and each equal part is recorded as a cycle, as shown in Fig. 3(b); the line integral of the electric field intensit...

Embodiment 3

[0093] Figure 1(c) is a schematic diagram of the shed structure for improving the electric field distribution of the composite insulator with the "one large and one small" shed structure in a single equal part. Figure 4(a) ~ Figure 4(d) It is a schematic flow chart of a method for improving the electric field distribution of a composite insulator with a shed structure of "one large and one small" in a single equal portion. First, the length of the composite insulator string is determined according to the voltage level of the transmission line; in the case of no shed, the distribution of the electric field intensity E on the surface of the core rod of the composite insulator in the axial direction is calculated by establishing a two-dimensional axisymmetric electrostatic field finite element model, as shown in Fig. 4(a); the insulator string is divided into 10 equal parts along the axial direction, and each equal part is recorded as a cycle, as shown in Fig. 4(b); the line inte...

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Abstract

The invention relate to an umbrella skirt structure for improving electric field distribution of a composite insulator. An insulator string is divided into N equal parts along an axial direction, eachequal part is marked with a period, each period comprises a plurality of insulator umbrella skirts and at least comprises an insulator umbrella skirt, the diameters of the umbrella skirts are same when not only one insulator umbrella skirt is contained in each period, or the umbrella skirts are distributed according to a one-large-one-small or one-large-two-small way, the one-large-one-small distribution is in a way that the insulator umbrella skirt with relatively large diameter and the insulator umbrella skirt with relatively small diameter are sequentially arranged on a core rod in a staggered way, the one-large-two-small distribution is in a way that the insulator umbrella skirt with relatively large diameter and two insulator umbrella skirts with relatively small diameters form a group of umbrella skirt combination, and a plurality of umbrella skirt combinations are sequentially arranged on the core rod. By the umbrella skirt structure, the problem of non-uniform composite insulator electric field distribution can be effectively solved, and the pressure-resistant strength of the insulator is improved.

Description

technical field [0001] The invention belongs to the field of power transmission lines, in particular to a shed structure and method for improving the electric field distribution of composite insulators, which are mainly used for improving the electric field distribution of composite insulators and increasing the withstand voltage strength of the insulators. Background technique [0002] Existing composite insulators either use sheds of the same size, or use “one large and one small” or “one large and two small” sheds arranged axially and periodically; this shed structure does not match the axial electric field distribution of the insulator, As a result, the electric field intensity of the shed at the end of the composite insulator is very high, which is very prone to flashover and eventually leads to the breakdown of the entire insulator. To solve this problem, the traditional method is to add a voltage equalizing ring at both ends of the composite insulator to make the elec...

Claims

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Application Information

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IPC IPC(8): H01B17/32H01B17/38H01B19/00
CPCH01B17/32H01B17/38H01B19/00
Inventor 邱立王于東曹成熊奇邓长征江进波陈龙常鹏
Owner CHINA THREE GORGES UNIV
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