A pressure gel forming method for zero partial discharge voltage transformer

A technology of voltage transformer and pressure gel, which is applied in the manufacture of inductors, inductors/transformers/magnets, transformers, etc. It can solve the problems of difficult to observe mold overflow, undefined epoxy resin material characteristics, and partial discharge level to be solved. Control and other issues to achieve the effect of improving mold turnaround time, reducing vacuuming time and material preparation time, and improving partial discharge performance

Active Publication Date: 2016-06-08
STATE GRID CORP OF CHINA +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also the following disadvantages: the pressure gel mold is installed in a vacuum tank. In order to adapt to molds of different sizes, the vacuum tank must have a large internal space, but too large internal space will obviously prolong the vacuuming time and affect production efficiency. At the same time, it is difficult to observe the overflow of the mold during injection and pressure-holding molding, which is not conducive to process control; at the same time, it does not mention the performance of the voltage transformer produced by this method, especially the partial discharge performance, and it is not limited Properties of epoxy resin materials critical for pressure gel production of transformers
However, the pre-baking process of the body is relatively complicated, the operation time is long, the production efficiency is low, and the partial discharge level needs to be controlled

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the zero partial discharge voltage transformer (10kV) pressure gel forming method includes the following steps:

[0033] (1) Preparation of pressure gel material:

[0034] The pressure gel material is composed of the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, the viscosity at 25°C is 3200mPas; 90 parts of anhydride curing agent methyltetrahydrophthalic anhydride, the viscosity at 25°C is 1000mPas ; 320 parts of active silica powder, the median particle diameter D50 is 4 microns; 0.5 part of red color paste;

[0035] The batching method is: before batching, preheat the active silica powder in an oven at 105°C for 15 hours, and then cool it to 30°C with the furnace temperature for standby; take bisphenol A epoxy resin, acid anhydride curing agent methyltetrahydrophthalic anhydride, active Silica powder and color paste, control the temperature at 35°C, stir and vacuumize for 2 hours to obtain a pressure gel materi...

Embodiment 2

[0044] In this embodiment, the zero partial discharge voltage transformer (10kV) pressure gel forming method includes the following steps:

[0045] (1) Preparation of pressure gel material:

[0046] The pressure gel material is composed of the following raw materials in parts by weight: 90 parts of bisphenol A epoxy resin, the viscosity at 25°C is 4000mPas; 75 parts of anhydride curing agent methyltetrahydrophthalic anhydride, the viscosity at 25°C is 1800mPas ; 260 parts of active silica powder, the median particle diameter D50 is 5 microns; 0.5 part of red color paste;

[0047] The batching method is: before batching, preheat the active silica powder in an oven at 105°C for 15 hours, and then cool it to 30°C with the furnace temperature for standby; take bisphenol A epoxy resin, acid anhydride curing agent methyltetrahydrophthalic anhydride, active Silica powder and color paste, control the temperature at 35°C, stir and evacuate for 2 hours to obtain a pressure gel material...

Embodiment 3

[0056] In this embodiment, the zero partial discharge voltage transformer (10kV) pressure gel forming method includes the following steps:

[0057] (1) Preparation of pressure gel material:

[0058] The pressure gel material is composed of the following raw materials in parts by weight: 95 parts of bisphenol A epoxy resin, the viscosity at 25°C is 6000mPas; 80 parts of anhydride curing agent methyltetrahydrophthalic anhydride, the viscosity at 25°C is 2500mPas ; 290 parts of active silica powder, the median particle diameter D50 is 9 microns; 1 part of red color paste;

[0059] The batching method is: before batching, preheat the active silica powder in an oven at 120°C for 10 hours, and then cool it to 30°C with the furnace temperature for standby; take bisphenol A epoxy resin, acid anhydride curing agent methyltetrahydrophthalic anhydride, active Microsilica powder and color paste, control the temperature at 50°C, stir and vacuumize for 3 hours to obtain a pressure gel mate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a zero-partial discharge pressure gel forming method for a potential transformer, and belongs to the technical field of electrical manufacturing and electrical equipment. The method has the following advantages that the labor intensity of workers is lowered obviously; production efficiency is improved, and mold cycling time is shortened; the number of air gaps can be decreased by the way that a pressure gel mold is filled with SF6 gas after being vacuumized, the partial discharge performance of the product can be improved obviously, and the partial discharge is zero under a 14.4 kV standard specified voltage; the appearance quality of the potential transformer is improved, due to the fact that the pressure of 0.25-0.35 MPa needs to be applied to the product in the pressure gel forming process, the dimension is decreased after demolding is conducted, and the mold joint of the mold and the appearance glossiness of the product are improved obviously; (5) the toughness and the crack resistance of the product are improved, activated silica powder and an epoxy resin system have good compatibility, a stepped temperature rising and temperature dropping mode is adopted at the later solidification stage, and inside or outside cracking of the product due to sudden temperature dropping can be prevented.

Description

technical field [0001] The invention specifically relates to a pressure gel forming method for a zero partial discharge voltage transformer, which belongs to the technical field of electrical manufacturing and electrical equipment. Background technique [0002] 10kV castable voltage transformer is widely used in switchgear and other electrical equipment, and is an important measurement and protection product. At present, the vacuum casting process is mainly used in China to produce 10kV castable voltage transformers, while the pressure gel process is mainly used abroad to produce 10kV castable voltage transformers. No matter which production process is used, for the production of voltage transformers, the most important thing is to control the partial discharge level within the range required by the national standard. Of course, a lower partial discharge level is more conducive to the long-term stable use of the transformer. [0003] At present, most of the companies that u...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/24H01F41/00B29C45/17B29C45/57
Inventor 史鸿威陈晓丽陈延辉宋晓光龚浩李杏龙王茂玉
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap