Unlock instant, AI-driven research and patent intelligence for your innovation.

Distribution line single-phase earth fault section identification method based on phase current variation

A single-phase ground fault and distribution line technology, applied in the fault location, fault detection by conductor type, short-circuit test, etc., can solve the problem of inability to realize fault section identification

Pending Publication Date: 2022-02-11
国网青海省电力公司玉树供电公司 +3
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional line selection strategy can only select the faulty line, but cannot realize the identification of the faulty section

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
  • Distribution line single-phase earth fault section identification method based on phase current variation
  • Distribution line single-phase earth fault section identification method based on phase current variation
  • Distribution line single-phase earth fault section identification method based on phase current variation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0047] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways than described here. Therefore, the protection scope of the present invention is not limited by the specific implementation disclosed below. Example limitations.

[0048] see figure 2 and image 3 , an embodiment of the present invention, proposes a method for identifying a single-phase ground fault section of a distribution line based on phase current variation, wher...

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 provides a distribution line single-phase earth fault section identification method based on phase current variation, which comprises the following steps: when a line has a single-phase earth fault, comparing the amplitude and phase of the variation of three-phase current at the same measurement point before and after the fault; if the amplitude and the phase of the three-phase current variable quantity are basically the same, determining that the measuring point is at the load side of the fault point; if the amplitude of one phase in the three-phase current variation is obviously greater than that of the other two phases and the phase is opposite to that of the other two phases, determining that the measuring point is on the power supply side of the fault point, wherein each measuring point uploads the judgment result to the master station, and the master station compares the judgment results of two adjacent measuring points in sequence; and if two adjacent measuring points are respectively at the power supply side and the load side of the fault point, judging that the fault occurs between the two measuring points. According to the technical scheme, the single-phase earth fault section of the distribution line can be accurately identified, and the single-phase earth fault can be quickly and selectively removed from the two ends of the line.

Description

technical field [0001] The invention relates to the technical field of power system protection and control, in particular to a method for identifying single-phase ground fault sections of distribution lines based on phase current variation. Background technique [0002] Single-phase ground fault is the main fault type of distribution network, accounting for more than 80%. In order to improve the reliability of power supply, the medium-voltage power distribution system usually adopts the method of non-effective grounding of the neutral point. In this way, the industry standard stipulates that the system is allowed to maintain operation for 2 hours after a single-phase ground fault occurs. The above approach avoids frequent power outages caused by the frequent occurrence of single-phase ground faults, and also leaves enough time for the processing of single-phase ground faults. However, a single-phase ground fault will cause overvoltage, which poses a huge threat to the pers...

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): G01R31/08G01R31/52
CPCG01R31/085G01R31/52
Inventor 韦勇鲍勇彬潘兹勇韩生海聂寿林周存孝黄鹏天陈昀何树旺马鹿潘博超魏红燕马媛范瑞妮吴晓辉徐毅端
Owner 国网青海省电力公司玉树供电公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com