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

Single-phase earth fault detection method and device

A single-phase ground fault and detection method technology, which is applied in the direction of measuring devices, fault locations, and fault detection according to conductor types, can solve the problems of inapplicable accuracy of the transient line selection method, and achieve improved detection accuracy and power distribution The effect of network operation reliability

Pending Publication Date: 2021-10-26
NR ELECTRIC CO LTD +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not need to add signal injection source, zero-sequence PT and zero-sequence CT, is not affected by load current disturbance and system frequency fluctuation, and solves the problem that the conventional transient line selection method is not applicable or has low accuracy when the zero-sequence component cannot be collected

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
  • Single-phase earth fault detection method and device
  • Single-phase earth fault detection method and device
  • Single-phase earth fault detection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] The invention provides a single-phase ground fault detection method, which is aimed at a 3kV-66kV distribution network system. figure 2 Shown is a schematic flow chart of the embodiment of the present application. like figure 2 As shown, the single-phase-to-earth fault detection methods include:

[0045] S10: real-time acquisition of line three-phase current;

[0046] S20: Perform data processing on the three-phase current: calculate the self-produced zero-sequence current and the fundamental frequency and fundamental wave period of the phase current according to the three-phase current; filter out the load current in the three-phase current;

[0047] S30: When it is detected that the self-produced zero-sequence current has a sudden change, extract the sudden change component of the three-phase current after filtering the load current;

[...

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 single-phase earth fault detection method and device, which adopt the three-phase current of a line to judge whether an earth fault exists or not, and have universal applicability and economical efficiency in occasions without zero-sequence voltage and zero-sequence current acquisition. According to the method, positive sequence current is calculated through three-phase current, frequency and fundamental wave period are calculated in real time through the positive sequence current, transformation decomposition is performed on the three-phase current through wavelet packet transformation, transient and steady state break variable of current during grounding is captured, and then direction and amplitude are combined with an integral algorithm, influences under the conditions of non-power-frequency operation and load disturbance are effectively avoided, and the single-phase earth fault detection accuracy and the operation reliability of the power distribution network are improved.

Description

technical field [0001] The present invention relates to the technical field of power distribution in power systems, in particular to a method for detecting single-phase ground faults based on the transient state characteristics of three-phase currents when a single-phase ground fault occurs in a 3-66kV distribution network and device. Background technique [0002] Most of my country's 3-66kV distribution network is a small current grounding system, and a few are neutral point grounding systems through small resistance. For single-phase ground faults in low-current grounding systems and high-resistance single-phase ground faults in small-resistance grounding systems, the rapid detection of fault lines has always been a technical problem that plagues the stable operation of distribution networks. In view of this technical problem, when a single-phase ground fault occurs, the commonly used methods currently include the artificial wire pulling method, the signal injection metho...

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): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 曾先锋石勇朱中华侯炜陈俊高超赵健龙王栎涛王霄翔王俊人宋兵
Owner NR ELECTRIC CO LTD
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