Method and device for inhibiting transformer no-load switch-on surge

A no-load closing and transformer technology, used in emergency protection circuit devices, preventing/reducing unwanted electrical/magnetic effects, and electrical component structure associations, etc. The effect of malfunction

Inactive Publication Date: 2011-05-25
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the fact that the currently widely used methods cannot efficiently solve the problems of microcomputer protection malfunctions caused by transformer no-load closing inrush current, the patent of the present invention focuses on eliminating and suppressing transformer no-load closing inrush current, and provides a method for suppressing transformer no-load closing inrush current. A device and method for gate inrush current, thereby effectively solving problems such as microcomputer protection malfunctions caused by excessive excitation inrush current in power supply and distribution systems

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
  • Method and device for inhibiting transformer no-load switch-on surge
  • Method and device for inhibiting transformer no-load switch-on surge
  • Method and device for inhibiting transformer no-load switch-on surge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Such as figure 1 , figure 2 As shown, a device for suppressing transformer no-load closing inrush current is aimed at a three-phase AC transformer, which includes a switching device group 4 composed of more than one switching device, and the switching device group 4 is connected between the AC power switch 1 and the transformer 8 Each phase of alternating current corresponds to at least one switching device and a resistance-capacitance circuit connected in parallel with the switching device;

[0020] a three-phase bypass contactor 5, the bypass contactor 5 is connected in parallel with the switching device group 4,

[0021] A control unit 9, the control trigger pulse output terminal of the control unit 9 is connected to the control terminal of the switching device group 4;

[0022] It also includes the front-end voltage transformer 2 for detecting the power supply voltage, the current transformer 3 for detecting the transformer phase current, and the terminal voltage...

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 device and a method for inhibiting inrush current upon switching on an idling transformer. The device includes more than one thyristor set linked between an AC power switch and the transformer, each phrase of the AC current is linked to at least one thyristor set; a side contactor parallely linked to the thyristor sets; a resistance-capacitance circuit parallely linked to two ends of a thyristor power module which forms the thyristor set. A front end voltage transformer in the system tests the power voltage; a current transformer tests the phase current of the transformer; a back end voltage transformer tests transformer voltage whose signal output terminals are respectively linked to the corresponding input terminals of a control unit. The control unit firstly calculates the size and phase of the pre-magnetizing flux linkage in the transformer, and calculates the link time for the premier winding sets to determine the connecting time for the thyristor set, as well as the link time for other winding sets, finally short-circuits the thyristor through the side switch sets. The invention can inhibit the excitation inrush current upon switching on the idling transformer to a great extent.

Description

technical field [0001] The invention relates to a device for suppressing transformer excitation inrush current generated when a transformer is put into operation without load in a power supply and distribution system, in particular to a device and method for suppressing transformer no-load closing inrush current. Background technique [0002] The excessive excitation inrush current generated when the transformer in the power supply and distribution system is turned on without load often causes problems such as the malfunction of the microcomputer protection device, the increase of the mechanical stress of the winding, and the deterioration of the power quality. At present, for this situation, the second harmonic braking coefficient is basically changed in the front-end microcomputer protection device to avoid the no-load closing surge, thereby preventing the protection device from malfunctioning. However, when the transformer is closed with no load, due to the uncertainty of...

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): H02H7/04H01F27/34H01F27/40
Inventor 张铁军陈刚张少云张斌欧英彭勃陈雪
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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