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

Fault type identification method based on differential current and fault characteristic quantity

A technology for fault type identification and fault feature quantity, which is applied in the measurement of electrical variables, current/voltage measurement, and measurement devices.

Active Publication Date: 2020-04-24
DONGFANG ELECTRONICS
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For devices with differential protection, especially those with busbar differential protection, there is currently a lack of rapid identification methods for fault types suitable for device characteristics

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
  • Fault type identification method based on differential current and fault characteristic quantity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0031] like figure 1 , a fault type identification method based on differential current and fault characteristic quantity, which is implemented by using embedded software to write corresponding programs in the device software design based on bus differential protection. like figure 1 As shown, this method mainly includes two parts: data preparation and processing and identification and judgment, both of which are performed simultaneously in real time. The specific method is as follows:

[0032] 1) Allocate storage variables in the device software.

[0033] Assign relay words dwRWAN, dwRWBN, dwRWCN, dwRWAB, dwRWBC, dwRWCA, dwRWABN, dwRWBCN, dwRWCAN, dwRWABC and dwRWABCN to logically identify fault types and record them in real time. The specific names of the above variables are: AN ground fault type relay word dwRWAN, BN ground fault type relay word ...

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 fault type identification method based on differential current and fault characteristic quantity. The method comprises the steps of: calculating a maximum branch current value, a maximum phase current value and a maximum zero-sequence current value of each phase in real time, then carrying out protection area internal and external fault feature phase identification and protection area internal and external grounding fault feature identification according to calculated values, and writing judgment results into fault feature phase mark words and grounding fault featuremark words; and finally, combining the fault feature phase mark words and grounding fault feature mark words which are updated in real time to carry out logic judgment on the fault type. According tothe method, the differential current and the fault characteristic quantity are combined, a novel, practical, concise and reliable rapid fault type identification method is provided, and the method isespecially suitable for a bus differential protection device.

Description

technical field [0001] The invention relates to a method for identifying the fault type of a short-circuit fault in an electric power system, which is mainly used in busbar differential protection to realize fast fault type identification and message recording, and belongs to the technical field of electric power system relay protection. Background technique [0002] In order to meet the requirements of microcomputer relay protection device (hereinafter referred to as the device) fault action information recording and fault wave recording, it is necessary for the device to quickly identify the type of system fault and record it accurately and timely to help customers analyze accidents, make targeted repairs and Restore power early. [0003] For devices with differential protection, especially those with busbar differential protection, there is currently a lack of rapid identification methods for fault types that are suitable for device characteristics. Contents of the inve...

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): G01R19/165G01R31/52
CPCG01R19/16528G01R19/16571
Inventor 权宪军周前林海锋孙建波杨泽平姜光王建功赵洪强孔祥乾聂德顺
Owner DONGFANG ELECTRONICS
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