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

Current transformer based on active-compensation external magnetic field

A technology of current transformer and active compensation, which is applied in the direction of only measuring current, voltage/current isolation, measuring current/voltage, etc., can solve the problems of magnetic field distortion of shielding cover, increase of volume and weight, and complicated insulation treatment, etc., and achieve reduction The effect of working error, improving stability, improving external magnetic field immunity and accuracy

Inactive Publication Date: 2017-06-30
国网天津节能服务有限公司 +3
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of using a magnetic shield has the following disadvantages: (1) the shielding effect is limited, and may cause distortion of the magnetic field inside the shield; (2) the structure is complex, the volume and weight increase; (3) the insulation process is complicated

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
  • Current transformer based on active-compensation external magnetic field
  • Current transformer based on active-compensation external magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0014] A current transformer based on active compensation of an external magnetic field is based on a traditional current transformer with two pairs of measuring windings and compensation windings orthogonal to each other. Such as figure 1 As shown, the current transformer is composed of iron core, primary winding, secondary winding, two pairs of measuring windings, two pairs of compensation windings and two external magnetic field active compensation circuits. The primary winding and secondary winding are wound on the iron core to form a traditional In the current transformer, two pairs of measuring windings and compensation windings orthogonal to each other are wound on the outside of the traditional current transformer, which are the measuring winding X1 in the X-axis direction, the compensation winding X2 and the measuring winding Y1 in the Y-a...

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 relates to a current transformer based on an active-compensation external magnetic field. The technical characteristics are as follows: two pairs of measurement windings and compensation windings orthogonal to each other, namely, a measurement winding and a compensation winding in the X-axis direction and a measurement winding and a compensation winding in the Y-axis direction, are wound outside the current transformer; the two pairs of measurement windings and compensation windings are equal in number of turns and opposite in direction; and the two pairs of measurement windings and compensation windings respectively constitute an external magnetic field active compensation circuit in the X-axis direction and an external magnetic field active compensation circuit in the Y-axis direction. According to the invention, two pairs of measurement windings and compensation windings orthogonal to each other are wound outside the current transformer. Through the external magnetic field active compensation circuit between the two windings, the influence of an external magnetic field can be compensated actively. Therefore, the work error of the current transformer caused by the influence of an external magnetic field is reduced greatly, the stability of the current transformer is improved, the immunity to interference of an external magnetic field and precision of equipment are improved, and the effect of magnetic shielding is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of electric energy measurement, in particular to a current transformer based on active compensation of an external magnetic field. Background technique [0002] A current transformer (Current Transformer, referred to as CT) is composed of a closed iron core and a winding. The current transformer works according to the principle of electromagnetic induction. It can convert the primary current with a large value into a secondary current with a small value through a certain transformation ratio, which is used for protection, measurement and other purposes. [0003] The iron core of the current transformer is usually made of a material with high magnetic permeability, such as permalloy. When the current transformer is in a strong magnetic field environment, a circulating current will be generated, which will affect its accuracy and stability; at the same time, it will cause temperature rise. High, coupled with ...

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): G01R1/18G01R19/00G01R15/18G01R15/20
CPCG01R1/18G01R15/18G01R15/20G01R19/0092
Inventor 郭晓丹张超张凡隋淑慧孙学文陈彬邓志军周新华
Owner 国网天津节能服务有限公司
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