Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for preventing secondary open circuit of current transformer

A current transformer, secondary side technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve poor crack resistance, poor thermal stability, resin High brittleness and other problems, to achieve the effect of long working life, excellent insulation performance and light weight

Active Publication Date: 2019-08-06
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin is brittle, has poor crack resistance, is easy to crack, and has poor thermal stability and cannot withstand strong temperature shocks.

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
  • A method for preventing secondary open circuit of current transformer
  • A method for preventing secondary open circuit of current transformer
  • A method for preventing secondary open circuit of current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 , figure 2 As shown, a method for preventing the secondary open circuit of the current transformer, three current transformer secondary open circuit protection devices are installed in parallel on the secondary side of the current transformer, and each current transformer secondary open circuit protection device 2 is connected to the corresponding alarm The lamps 3 are connected in series, and the main circuit is provided with a current overload alarm 5. When the secondary side circuit is under high pressure, the secondary open circuit protection device 2 of the current transformer eliminates the high voltage of the secondary side circuit through a short circuit; at the same time, the corresponding alarm lamp 3 will On, the overload alarm 5 of the main current will give an alarm to remind the staff, so as to avoid damage to the secondary side instrument 1.

[0032] The current transformer secondary open-circuit protection device 2 includes a casing 6,...

Embodiment 2

[0034] Embodiment one is basically the same as embodiment two, the difference is that Figure 4As shown, the metal sheet 17 is a split structure, the upper end of the metal sheet 7 is connected with the metal sheet 3 10 to form a bimetallic sheet, the upper end of the metal sheet 7 and the metal sheet 3 10 are fixed by conductive bolts 11, and stacked to form an inverted bell mouth , the conductive ball 9 is arranged in the bell mouth, and the bell mouth clamps the conductive ball 9. When the voltage on the secondary side is high, the metal sheet 3 10 deforms and expands, so that the conductive ball falls below the glass tube, shorting the metal sheet 1 7 and the metal sheet 2 8, thereby eliminating the high voltage.

[0035] Embodiment 1 and Embodiment 2 both adopt the principle that thermal expansion coefficients of thermal bimetal sheets are inconsistent. When the secondary side circuit is under high pressure, the inert gas neon in the device is ionized to generate glow dis...

Embodiment 3

[0037] Embodiment 3 is different from Embodiment 1 and Embodiment 2 in that the metal sheets used are two-way memory alloy copper-aluminum-nickel alloy two-way memory alloy, and the conductive ball is made of molybdenum-aluminum alloy. When the current transformer secondary open circuit protection device After eliminating the high voltage of the secondary side circuit, remove the short-circuited current transformer secondary open-circuit protection device 2; use an AC voltage regulator to apply an AC voltage of 110-220V between the two poles, and when the two poles are separated, the current transformer secondary open-circuit protection device, the conductive ball 9 is slid to the top of the device. Disconnect the applied AC voltage of 110-220V, and after the electrode is cooled and reset, the conductive ball will be blocked by the metal sheet 7, and it can be used again.

[0038] It should be noted that the secondary open circuit protection device of the current transformer u...

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 provides a method for preventing secondary open circuit of a current transformer, wherein, a secondary open circuit protection device of the current transformer is arranged in parallel at the secondary side of the current transformer; when the secondary side loop voltage is high, the secondary open circuit protection device of the current transformer eliminates the secondary side loop high voltage through short-circuit connection; a secondary open circuit protection device for the current transformer includes a housing, a metal sheet 1, a metal sheet 2 and a conductive ball, wherein that shell is of an airtight structure, the inert gas is fil in the shell, the lower end of the metal sheet 1 and the metal sheet 2 are fixedly connected with the pins through the bottom of the shell, and the upper end of the metal sheet is an unclosed arc frame bent downward, and the arc frame clamps the conductive ball. The method adopts the ionization of inert gas in the enclosed glass tubeto generate glow discharge, and the heat of the glow discharge causes the metal sheet to be thermally expanded, so that the conductive sphere in the glass tube is free to fall, and the two electrodesare short-circuited and closed, so that the method of short-circuiting the open circuit winding of the electromagnetic current transformer is low in cost and can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of current transformer open circuit protection, in particular to a method for preventing a secondary open circuit of a current transformer. Background technique [0002] At present, the vast majority of current transformers commonly used in power systems are still electromagnetic. From the perspective of the structure of the electromagnetic current transformer, the primary winding has only one or two turns, and the secondary winding has hundreds or even thousands of turns wound on the same closed silicon steel sheet assembly. According to the principle of electromagnetic induction, when an AC voltage is applied to the primary side, an electromotive force is induced on the secondary side. It can be seen from N1 / N2=U1 / U2 that the voltage on the side with fewer turns is low, and the voltage on the side with more turns is high, and the number of turns is proportional to the voltage. In actual work, when the el...

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): H02H9/04H02H9/06
CPCH02H9/043H02H9/06
Inventor 裴继东蒋延磊银高胜王锴张文刚陈越健张军彭磊亚朱亚丽梁璐张世坤王莹秋韩贝贝王慧娴
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com