Differential protection discrimination method based on integrated sequence component

A technology of differential protection and discrimination method, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of inability to distinguish and identify fault areas, etc., and achieve the effects of saving project costs, reducing the number, and simple algorithms

Active Publication Date: 2017-05-10
NR ELECTRIC CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a differential protection discrimination method based on the comprehensive sequence component, which is used to solve the problem that the fault area cannot be distinguished and identified when a fault occurs in a multi-stage series power supply cable line , and is not affected by the branch load of the multi-stage series supply line

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
  • Differential protection discrimination method based on integrated sequence component
  • Differential protection discrimination method based on integrated sequence component
  • Differential protection discrimination method based on integrated sequence component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] see figure 1 , figure 2 and image 3 , the differential protection discrimination method based on the comprehensive sequence component includes the following steps:

[0019] Positive-sequence current differential elements and negative-sequence current differential elements are used to identify faults in the zone, and phase-separated current differential elements are used to identify fault phases;

[0020] When the positive sequence differential current element operates and the result of differential phase selection is a three-phase fault, and there is no internal fault blocking signal, it is judged as an internal three-phase fault;

[0021] When the negative-sequence differential current element operates and the result of phase selection is a single-phase or two-phase fault, and there is no internal fault b...

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 differential protection discrimination method based on an integrated sequence component. The integrated sequence component differential protection is composed of three parts including a positive sequence current differential element, a negative sequence current differential element, and a phase current differential element. The positive sequence current differential element is used to identify three-phase faults. The negative sequence current differential element is used to identify asymmetrical faults. The phase current differential element is used to identify fault phases. If both the positive sequence current differential element and three-phase current differential element operate, a three-phase fault is determined. If the negative sequence current differential element operates and a single-phase or two-phase current differential element operates, an in-region asymmetric fault, including single-phase or two-phase faults, is determined. The differential protection discrimination method can quickly and accurately identify a fault section after the fault is generated in a regional power grid, can greatly reduce the number of used optical transformers, saves the project cost, is not affected by the load-side zero sequence component, reliably unoperate in case of out-region faults and reliably operates in case of in-region faults.

Description

technical field [0001] The invention relates to a method for distinguishing and identifying a fault area when a fault occurs in a multi-stage series power supply cable line, in particular to a differential protection discrimination method based on a comprehensive sequence component. Background technique [0002] The application of multi-level series power cable lines in large and medium-sized cities is becoming more and more extensive. The protection of series power cables is generally based on distance or overcurrent protection. The series power cables are generally connected to multiple loads. The level difference cannot meet the reliability requirements of power supply, and it is difficult to confirm the location of cable faults. In order to improve the reliability of power supply and improve the ability to quickly restore power supply, without affecting the operation of the equipment, a group of light The flexible transformer transmits the measured phase-separated curren...

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
IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 沈军朱晓彤赵青春刘革明徐晓春戴光武谢华张洪喜刘奎王忠李奔
Owner NR ELECTRIC CO LTD
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