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A kind of insulating medium and preparation method thereof for improving vacuum surface flashover voltage

An insulating medium and flashover technology applied to insulators, organic insulators, circuits, etc., to achieve low process difficulty, high reliability, and strong operability

Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, previous studies only focused on the effect of phenolphthalein on the change of polyethylene aggregate structure, and no one has studied the use of phenolphthalein doping to improve the trap parameters and vacuum flashover properties of semi-crystalline polymer materials such as polyethylene. involve

Method used

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  • A kind of insulating medium and preparation method thereof for improving vacuum surface flashover voltage
  • A kind of insulating medium and preparation method thereof for improving vacuum surface flashover voltage
  • A kind of insulating medium and preparation method thereof for improving vacuum surface flashover voltage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 60° C., and the time is 12 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 135°C, and rotate at 60 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 30 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 130°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.

Embodiment 2

[0031] Embodiment 2: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 50° C., and the time is 12 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 125°C, and rotate at 60 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 50 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 150°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.

Embodiment 3

[0032] Embodiment 3: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 80° C., and the time is 11 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 145°C, and rotate at 40 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 40 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 140°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.

[0033] Take the round sample prepared in Example 1 as an example:

[0034] Table 2 shows the crystallinity and spherulite size of pure LDPE samples and different types of LDPE ...

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Abstract

The invention provides an insulating medium capable of improving a vacuum surface flashover voltage and a preparation method of the insulating medium. The insulating medium comprises phenolphthalein and a semi-crystalline polymer material, wherein the amount of the phenolphthalein is assumed to be a; the amount of the semi-crystalline polymer material is assumed to be b; on the basis of mass fraction, a is smaller than or equal to 5% and greater than 0; b is smaller than 100% and greater than or equal to 95%; and the preparation method of the insulating medium comprises the following steps: (1) drying the phenolphthalein and the semi-crystalline polymer material at 50-80 DEG C; (2) heating the dried semi-crystalline polymer material in a molten state; (3) adding the phenolphthalein to the molten semi-crystalline polymer material, and carrying out melt blending on the phenolphthalein and the molten semi-crystalline polymer material for 30-50 minutes to obtain a composite material; (4) extruding the composite material, and naturally cooling the composite material to a room temperature; and (5) carrying out hot press molding on the cooled composite material to obtain an insulating medium sample. The vacuum surface flashover voltage of the insulating medium can be significantly improved; and the preparation method is low in process difficulty, high in operability and high in reliability, and can be widely applied to the field of high-voltage insulating materials.

Description

technical field [0001] The invention belongs to the field of high-voltage insulating materials, and in particular relates to an insulating medium for increasing vacuum surface flashover voltage and a preparation method thereof. Background technique [0002] As a special insulating medium, vacuum is widely used in high-voltage electrical equipment and vacuum devices due to its excellent dielectric properties. However, the creepage flashover voltage of solid insulators introduced into high-voltage electrical equipment based on the need for insulating support is much lower than the vacuum gap of the same size or the bulk breakdown voltage of insulating materials, which seriously restricts the insulation performance of vacuum electrical systems And the miniaturization development of high-voltage electrical equipment. Therefore, it is of great significance for practical engineering applications to study the phenomenon of vacuum surface flashover and its formation mechanism, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B17/42H01B17/50H01B3/18H01B19/04
CPCH01B3/18H01B17/42H01B17/50H01B19/04
Inventor 李盛涛聂永杰茹佳胜张翀邢照亮
Owner XI AN JIAOTONG UNIV
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