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

Method for authenticating sympathetic inrush current in traction substation transformer

A technology for traction transformers and traction substations, which can be used in the measurement of current/voltage, instruments, electrical components, etc., and can solve and respond to problems such as low inrush current identification accuracy.

Inactive Publication Date: 2013-10-16
TSINGHUA UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of the existing method described in the above technical background for the low identification accuracy of the inrush current, the present invention proposes a method for identifying the inrush current in the transformer of the traction substation

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 for authenticating sympathetic inrush current in traction substation transformer
  • Method for authenticating sympathetic inrush current in traction substation transformer
  • Method for authenticating sympathetic inrush current in traction substation transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0039] figure 1 It is the wiring diagram for cascade operation of transformers in traction substations. The traction transformer T1 is in a normal operating state, and at a certain moment, the traction transformer T2 is switched on without load. The initial excitation inrush current will be generated in the no-load closing traction transformer, and the inrush current phenomenon will be generated in the running traction transformer.

[0040] Through the current transformer and voltage transformer of the primary and secondary windings of the traction transformer in operation in the traction substation, the phase current of the primary winding and the secondary winding and the phase voltage of the primary winding are obtained, corresponding to figure 2 , image 3 , Figure 4 , and calculate the differential flow on both sides. figure 2 It is the current on the primary side of the running traction transformer T1 in the embodiment of the present invention, and the three phase...

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 method for authenticating sympathetic inrush current in a traction substation transformer, which belongs to the technical field of relaying protection of main equipment of a power supply system. The method is used for authenticating the sympathetic inrush current in the traction transformer by using a theory that a time difference exists between a switch-on time of the traction transformer and an emerging time of differential current. The method is applicable to three-phase transformers in any forms, is high in authenticating speed and high in reliability, and cannot be affected by harmonic waves.

Description

technical field [0001] The invention belongs to the technical field of relay protection for main equipment of a power supply system, and in particular relates to a method for identifying inrush currents in transformers of traction substations. Background technique [0002] The application of differential protection as the main protection of transformers in traction substations has many deficiencies in the protection of traction transformers. As the main protection of the traction transformer, its correct action rate has always been very low. When one traction transformer is running, and the insulation performance of the vacuum circuit breaker on the low-voltage side of the other traction transformer in standby is not good, it often happens that the standby transformer is switched on, resulting in excitation inrush current; at the same time, it will cause cascading and Should flow. The cascading and inrush current and the excitation inrush current act together, on the one h...

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): H02H7/045G01R19/165
Inventor 毕大强冯存亮
Owner TSINGHUA UNIV
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