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

Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof

A converter transformer and 12-pulse technology, applied in the field of transformers, can solve the problems of no obvious excitation inrush current characteristics of differential current, large difference protection malfunction, etc., to achieve long-term safe and stable operation, prevent protection malfunction, and easy implementation. Effect

Active Publication Date: 2013-01-23
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide a 12-pulse converter transformer, aiming to solve the problem that the 12-pulse converter transformer may form a three-phase symmetrical inrush current caused by residual magnetism when charging, resulting in no obvious excitation of the three-phase differential current Inrush current characteristics, resulting in the problem of misoperation of large difference protection

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
  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof
  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof
  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0035] The equivalent circuit diagram of the twelve-pulse converter transformer before empty charging is as follows: figure 2 Shown, T 1 is the star angle change, T2 is the star change, and K is the switch. L 1m , L 1σ , R lσ1 , L 2m , L 2σ , R 2σ Respectively T 1 , T 2 Excitation inductance, primary and secondary side leakage inductance, coil resistance, Ls, Rs are system inductance and resistance. Let the system power supply voltage Us(θ)=Umsin(θ), i 1 i 2 are the currents on both sides of the transformer respectively, and the reference direction is that the busbar points to the transformer; i s For the current from the system, the reference direction is the system pointing to the bus. Φ 1 and Φ 2 for T 1 and T 2 core...

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 twelve pulsating commutation transformer and a method and a circuit for removing residual magnetism thereof. In the principle of the method, direct current is injected sequentially in a positive direction and a reverse direction according to wiring during a test of a direct-current resistor and is reduced gradually, and a magnetic-lag loop of an iron core is reduced to achieve the aim of removing the residual magnetism. Through the method, the commutation transformer can run reliably, and the long-term, safe and stable operation of a high-voltage direct-current transmission system is realized; and the method has the advantages of simple and easy implementation, reliable demagnetizing and capability of preventing malfunction from generating.

Description

technical field [0001] The invention relates to a transformer, in particular to a twelve-pulse converter transformer, a method for removing residual magnetism thereof, and a high-voltage direct current transmission system using the twelve-pulse converter transformer. Background technique [0002] Due to its unique advantages, such as: long distance, high power, asynchronous networking, fast power adjustment, power flow controllability, transmission economy, etc., HVDC transmission is more and more widely used. [0003] In order to reduce the harmonic components of the system, different connection methods of transformer windings are used to provide two sets of three-phase symmetrical commutation with equal amplitude and 30° phase difference (fundamental electrical angle) for two series-connected converters voltage to achieve twelve-pulse commutation. [0004] figure 1 The wiring of the 12-pulse converter transformer is shown. In order to reflect the internal phase-to-phase ...

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): H02P13/00
Inventor 田庆王海军程江平张楠张兴华
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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