Preparation method of polyfluortetraethylene medium-pressure casing pipe for current transformer

A technology of polytetrafluoroethylene and current transformer, which is applied in the field of electric power, can solve the problems of high processing cost, inconvenient maintenance and transportation, and fragile and fragile materials, and achieve the reduction of mold manufacturing cost, light specific gravity and high dielectric constant. small effect

Inactive Publication Date: 2010-08-11
NANJING COMPTECH MATERIALS
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  • Description
  • Claims
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Problems solved by technology

This kind of material is fragile and easy to damage, which is inconvenient

Method used

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  • Preparation method of polyfluortetraethylene medium-pressure casing pipe for current transformer
  • Preparation method of polyfluortetraethylene medium-pressure casing pipe for current transformer
  • Preparation method of polyfluortetraethylene medium-pressure casing pipe for current transformer

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[0024] The present invention will be further described below in conjunction with the drawings.

[0025] Make figure 1 , 2 The methods for the two specifications of current transformer PTFE medium voltage bushings (insulated terminals) are as follows.

[0026] 1. Selection of raw materials.

[0027] The diameter of suspended polytetrafluoroethylene F4 particles is selected: 150-300μm, and the apparent density is 0.6g / l.

[0028] 2. Mold design and selection

[0029] A mold with a reasonable structure is an important condition to ensure good performance and accurate dimensions of the molded product. The design of the mold should be compatible with the molding process and have the characteristics of maximum production capacity, safe operation, simple manufacturing, low cost and durability.

[0030] ①. Design process parameters

[0031] After sintering and cooling the PTFE molded preform, the axial and radial dimensions will shrink or increase. The shrinkage rate is related to factors such ...

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Abstract

The invention provides a preparation method of a polyfluortetraethylene medium-pressure casing pipe. The medium-pressure casing pipe prepared by the method has corrosion resistance, temperature resistance, voltage resistance, can satisfy the machining requirements on the medium-pressure casing pipe, and has low cost. The preparation method comprises the step of carrying out compression molding on suspension polyfluortetraethylene; the compression molding comprises three steps of premolding, sintering and cooling, wherein in sintering process, heat preservation is carried out for 0.8-1.2h after the temperature rises to 130-170 DEG C from the room temperature at a constant speed; then heat preservation is carried out for 0.8-1.2h after the temperature rises to 235-265 DEG C at a constant speed; subsequently heat preservation is carried out for 0.8-1.2h after the temperature rises to 310-320 DEG C at a constant speed; then heat preservation is carried out for 0.8-1.2h after the temperature rises to 325-335 DEG C; and finally heat preservation is carried out for 1.9-2.4h after the temperature rises to 360-380 DEG C at a constant speed.

Description

technical field [0001] The invention relates to a method for preparing a polytetrafluoroethylene medium-voltage bushing (insulated terminal) for a 35KV-750KV current transformer, specifically, a method for processing polytetrafluoroethylene into a medium-voltage bushing for a current transformer, It belongs to the field of electric power technology. Background technique [0002] Medium-voltage bushings (insulated terminals) for current transformers require excellent electrical insulation, small dielectric constant (2.0-2.2), high frequency, chemical corrosion resistance, flame retardancy, aging resistance (≥50 years), and easy machining and other characteristics. [0003] At present, the materials and mechanisms used for medium-voltage bushings in various countries are different, with obvious advantages and disadvantages, such as ceramics, glass, and phenolic epoxy resin. Such materials are fragile and vulnerable to maintenance and transportation, and the processing cost i...

Claims

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Application Information

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IPC IPC(8): H01F38/28H01F41/00H01B17/58B29C67/04
Inventor 杨文光焦小东陈朝曦杨烨陈佩民徐小曼
Owner NANJING COMPTECH MATERIALS
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