A 8-side transformer differential principle for avoiding CT parallel connection

A transformer and principle technology, applied in the field of differential protection principle of power system relay protection and eight-side transformer differential principle, can solve the problem that the differential protection cannot fully meet the protection configuration requirements, increase the protection CT unbalanced current, and cannot protect the configuration. And other issues

Inactive Publication Date: 2008-08-06
GUODIAN NANJING AUTOMATION
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Generally, the curing method is adopted, and the protection configuration cannot be flexibly configured.
[0004] 2. It can only be calculated up to six sides. If there are more than six sides, the general measure is to connect the CTs of the seventh and eighth sides to the front six sides, which increases the normal inflow protection. The unbalanced current of CT puts forward higher requirements for the setting of protection
In addition, if the differential protection operates, it is impossible to know exactly which side has the fault, which sets obstacles to timely troubleshooting
[0005] Therefore, the current differential protection cannot fully meet the protection configuration requirements of different wiring methods on site

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 8-side transformer differential principle for avoiding CT parallel connection
  • A 8-side transformer differential principle for avoiding CT parallel connection
  • A 8-side transformer differential principle for avoiding CT parallel connection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Below in conjunction with accompanying drawing, the present invention is specifically introduced as follows:

[0046] When adopting the traditional proportional braking principle or the hyperbolic gradient differential principle, the present invention is applicable. figure 1 is the traditional proportional braking action characteristic diagram; figure 2 It is the characteristic diagram of the braking action with hyperbolic gradual change.

[0047] 1. Action equation:

[0048] (1) The action equation of the traditional proportional braking principle is:

[0049] I d > I q ; I z I g I d ...

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 an eight-side transformer differential principle for avoiding a CT from parallel connection, which is characterized in that class technology and object oriented technology in high-level languages are adopted in a protection configuration; the electric quantity calculated by transformer differential protection is enlarged to eight sides; in a configuration software, a two-side, a three-side, a four-side, a five-side, a six-side, a seven-side or an eight-side differential protection configuration is selected to avoid the CT from parallel connection. The invention enlarges the electric quantity calculated by transformer differential protection to eight sides, avoids the situation of the parallel connection of the CT, reduces the unbalanced current flowing into the CT of a protecting device in a normal condition and avoids the misoperation of differential protection; the class technology and object oriented technology in high-level languages are adopted in the protection configuration; the protection configuration can be selected in the configuration software, thereby well adapting to the requirements of the differential protection configuration of various connection modes on the spot.

Description

technical field [0001] The invention relates to the principle of differential protection for relay protection of electric power system, and in particular relates to a differential principle of an eight-side transformer which avoids parallel connection of CTs. The utility model belongs to the technical field of electric power automation. Background technique [0002] The transformer differential protection currently used has the following problems: [0003] 1. Generally, the curing method is adopted, and the protection configuration cannot be flexibly configured. [0004] 2. It can only be calculated up to six sides. If there are more than six sides, the general measure is to connect the CTs of the seventh and eighth sides to the front six sides, which increases the normal inflow protection. The unbalanced current of CT puts forward higher requirements for protection setting. In addition, if the differential protection operates, it is impossible to know exactly which side ...

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): H02H7/045H02H3/26
Inventor 陆于平
Owner GUODIAN NANJING AUTOMATION
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