Dry capacitive-type through wall-penetrating bushing employing impregnated fiber

A wall bushing and capacitive type technology, applied in the direction of lead-in/through-type insulators, electrical components, etc., can solve problems such as partial discharge of bushings, corrosion of metal parts, and reduce the stability of bushing operations, so as to improve stability , Increase the effect of insulation strength

Inactive Publication Date: 2016-06-01
NANJING ELECTRIC HIGH VOLTAGE BUSHING
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During long-term operation, the bushing must not only withstand the long-term maximum working voltage, but also withstand various possible overvoltages. The traditional oil-paper capacitive wall-piercing bushing itself is gradually deteriorated due to the insulating medium (cable paper, transformer oil) Various accidents are prone to occur due to reasons such as moisture, partial discharge, etc. Among them, the lack of oil in the bushing will cause moisture to invade, resulting in damp insulation, which will cause partial discharge inside the bushing, and even cause an explosion; and another structure, the capacitor core The polytetrafluoroethylene film is used as the insulating layer, and the capacitive screen is made of aluminum foil. Since the gap between the insulating layers or between the insulating layer and the aluminum foil is filled with insulating silicone oil, the core itself is easy to slide the screen, which reduces the stability of the bushing operation.
[0003] Due to the large number of windings of the current transformer required by the secondary equipment, the dedicated current transformer cannot meet the needs of the current circuit of the secondary equipment. Therefore, the current transformer is usually installed in the bushing to provide the secondary equipment with secondary current. , At present, the traditional wall bushing will reserve the position of the current transformer, which is produced and installed separately, which is costly and difficult to install. At the same time, the independently installed current transformer will inevitably condense, causing metal parts to corrode. even insulation breakdown

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dry capacitive-type through wall-penetrating bushing employing impregnated fiber
  • Dry capacitive-type through wall-penetrating bushing employing impregnated fiber
  • Dry capacitive-type through wall-penetrating bushing employing impregnated fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The manufacturing method of a glue-impregnated fiber dry capacitive through-wall bushing described in this embodiment includes the following steps:

[0039] (1) Production of capacitor core: use winding equipment to wrap glass fiber on the central rod by directly impregnating resin. The winding adopts a two-way cross method. When winding two layers, apply a layer of semiconductor glue and repeat the operation until the winding reaches the specified During the winding process, keep the glass fiber crossing angle at 90°, put it into the oven for curing after completion, the curing temperature is controlled at 140°C, and the curing time: 3h, to ensure that the capacitor core is completely cured, and the capacitor core is according to the drawing The given dimensions are processed;

[0040] (2) Integrate the current transformer with the through-wall flange, and use epoxy resin to completely bond the inner wall of the casing to the surface of the capacitor core;

[0041] (3...

Embodiment 2

[0045] The manufacturing method of a glue-impregnated fiber dry capacitive through-wall bushing described in this embodiment includes the following steps:

[0046](1) Manufacture of capacitor core: use rolling equipment to roll the glass fiber to the specified thickness with a tension of 8kg according to the hoop splicing method, cover it with a layer of aluminum foil, and weld it with an 80W electric soldering iron At the lap joint of aluminum foil, repeat the operation until the specified layer thickness locks the end of the glass fiber to complete the rolling; put the rolled capacitor core into a vacuum tank, control the temperature at 145°C, and vacuum degree 50Pa for dehydration After 80 hours, cool down to 85°C, vacuum 3Pa, pour the prepared adhesive (mixed with bisphenol A epoxy resin and phenolsulfonic acid in a ratio of 2:1) onto the surface of the capacitor core, and the pouring time 26h, take it out after completion, and then heat up and solidify. The temperature co...

Embodiment 3

[0062] The manufacturing method of a glue-impregnated fiber dry capacitive through-wall bushing described in this embodiment includes the following steps:

[0063] (1) Capacitor core production: the steps (1) Capacitor core production method: use the rolling equipment to roll the glass fiber to the specified thickness with a tension of 10kg according to the hoop splicing method, and cover it with a layer of aluminum foil After the ring lap is joined, use an 80W electric soldering iron to weld the lap joint of the aluminum foil, and repeat the operation until the specified layer thickness locks the end of the glass fiber to complete the rolling; put the rolled capacitor core into a vacuum tank, and the temperature Control at 135°C, vacuum degree 60Pa, carry out dehydration treatment, after 70 hours, cool down to 95°C, vacuum degree 2Pa, mix the prepared adhesive (bisphenol A epoxy resin and phenolsulfonic acid in a ratio of 2:1 made) to the surface of the capacitor core, the po...

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

No PUM Login to view more

Abstract

The invention discloses a dry capacitive-type through wall-penetrating bushing employing an impregnated fiber. The dry capacitive-type through wall-penetrating bushing comprises a capacitor core, a current transformer, a wall-penetrating flange and a protecting tube, wherein the capacitor core is a cylinder; the left end and the right end of the capacitor core are connected with umbrella skirts through epoxy resin; connection terminals are arranged at the outer ends of the umbrella skirts; the wall-penetrating flange is arranged at the middle part of the capacitor core; the protecting tube is arranged in the wall-penetrating flange and wraps the middle part of the capacitor core; the protecting tube and the wall-penetrating flange are clamped together; the current transformer is arranged between the protecting tube and the wall-penetrating flange; and the protecting tube is in a grid structure. The dry capacitive-type through wall-penetrating bushing is rigorous in material selection and scientific in preparation method; the capacitor core adopts the impregnated fiber as a main insulating material; by vacuum casting, the stability is improved; the insulating strength is strengthened; and the produced bushing is good in heat dissipation performance, environment-friendly, portable, firm to install and not easy to fall off.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a glue-impregnated fiber dry-type capacitive type penetrating wall bushing. Background technique [0002] Wall bushings are usually used in power distribution devices in power stations and substations, allowing conductive parts to pass through partitions, walls or other grounding objects, and play the role of insulating support and fixed connection with external wires. In the current power system, the traditional The oil-paper capacitor type and the two wall bushings using PTFE as the capacitor core are mainly used. During long-term operation, the bushing must not only withstand the long-term maximum working voltage, but also withstand various possible overvoltages. The traditional oil-paper capacitive wall-piercing bushing itself is gradually deteriorated due to the insulating medium (cable paper, transformer oil) Various accidents are prone to occur du...

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 Applications(China)
IPC IPC(8): H02G3/22H01B17/28
CPCH02G3/22H01B17/28
Inventor 孙闻峰辛万鹏孙永林刘敏
Owner NANJING ELECTRIC HIGH VOLTAGE BUSHING
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