Two-point in-phase grounding fault analysis method and related device for small-resistance grounding system

A fault analysis method and a small resistance grounding technology, applied in the power field, can solve the problems of low protection sensitivity and poor universality.

Pending Publication Date: 2021-09-07
GUANGDONG POWER GRID CO LTD +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a two-point in-phase ground fault analysis method and related devices for a small resistance grounding system, which are used to solve the technical problems caused by low protection sensitivity and poor universality in the prior art

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
  • Two-point in-phase grounding fault analysis method and related device for small-resistance grounding system
  • Two-point in-phase grounding fault analysis method and related device for small-resistance grounding system
  • Two-point in-phase grounding fault analysis method and related device for small-resistance grounding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] In order to better understand the present application scheme, the technical solutions in the present application embodiment will be apparent from the drawings in the present application, and the described embodiments are clearly described herein. It is an embodiment of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative labor premises, all of the present application protected.

[0052] See figure 1 , 2 And 3, application of the present two-phase ground fault analysis method with low resistance grounding system according to an embodiment, comprising:

[0053] Step 101, rendering low resistance grounding system with two-phase earth fault zero sequence equivalent, the equivalent zero sequence network comprising: a first and a second equivalent zero sequence equivalent zero sequence network.

[0054] Zero sequence current step 102, w...

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 two-point in-phase grounding fault analysis method and a related device for a small-resistance grounding system, and the method comprises the steps: drawing an equivalent zero-sequence network when a two-point grounding fault of the small-resistance grounding system occurs, and using a phasor analysis method to analyze the two-outlet in-phase grounding fault or a bus and outlet in-phase grounding fault of the system; extracting zero-sequence current phasors of all outgoing lines and neutral lines, and extracting the relative relation between the amplitude and the phase of all the zero-sequence currents. The fault feature focuses on describing the relative relation between zero-sequence currents of all measuring points after the fault instead of the absolute value, is not influenced by the fault distance and the fault point transition resistance, and still exists in the high-resistance grounding fault. And the maximum capacitance current extreme value 50A of a single line is analyzed, and the result has universality. And a theoretical basis is provided for solving two-point grounding protection and high-resistance grounding protection of a small-resistance grounding system.

Description

Technical field [0001] Technical Field The present application relates to electric power, in particular, it relates to a failure analysis method and related apparatus for low resistance grounding system with two-phase ground. Background technique [0002] Low resistance grounding system often use the field current flowing through the ground capacitive current protection feature of this zero sequence line formed when a ground fault occurs after the fault zero sequence current lines other than line failure, as a single-phase ground fault protection. The system when a lower resistance single-phase earth fault protection reliable operation, but in the high-resistance ground fault occurs, the fault detection difficult, are often protected tripping. When two o'clock same phase earth fault, since the zero sequence power increases, the ground becomes zero sequence current increases, increased zero-sequence voltage bus, as well as the respective fault line zero sequence current magnitude ...

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): G06F30/3323G06F30/367
CPCG06F30/3323G06F30/367
Inventor 区伟潮陈锦荣廖峰吴海江倪伟东黄明辉黎永豪李响李高明王跃强欧阳卫年黄国平廖华兴
Owner GUANGDONG POWER GRID 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