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

Line selection method and device for ground fault of low-current grounding system

A small current grounding and grounding fault technology, applied in fault location, emergency protection circuit device, fault detection according to conductor type, etc., can solve the problem that it cannot adapt to the improvement and development of distribution network, is easily affected by complex environment, and has poor operation effect. And other issues

Pending Publication Date: 2020-07-07
邯郸市科维电气有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a line selection method and device for grounding faults in small current grounding systems, so as to solve the problem that the above existing line selection methods and devices cannot adapt to the improvement and development of the distribution network, and are easily affected by complex environments, resulting in practical The problem of poor performance

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
  • Line selection method and device for ground fault of low-current grounding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a line selection method for a grounding fault in a small current grounding system. The method includes the following steps:

[0034] (1) Measure the zero-sequence voltage of the busbar and the zero-sequence current of each branch;

[0035] (2) The ground leakage resistance of the grounding line is calculated according to the zero-sequence voltage and zero-sequence current;

[0036] (3) According to the ground leakage resistance, it is judged whether the line is single-phase grounded, and the line is selected and tripped;

[0037] (4) If the fault is eliminated, process the selected line; if the fault is still not eliminated, continue the above steps to re-select the line until the fault is eliminated.

[0038] Specifically, in step (3), the judgment method is that the ground leakage resistance of the single-phase grounded line is greatly reduced compared with that of the normal line. According to this characteristic, by calculating the ground l...

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 line selection method and device for a ground fault of a low-current grounding system. The method comprises the steps: forming a single-phase grounding circuit; through the principle that the earth leakage resistance is greatly reduced when being compared with the earth leakage resistance of a normal line, continuously monitoring the zero-sequence voltage and zero-sequence current through an acquisition assembly; enabling a processing assembly to calculate the earth leakage resistance to select a fault line; enabling an execution assembly to trip the selected line toeliminate the fault, and if the earth fault still exists, repeatedly executing the line selection step until the fault is completely eliminated. The device has high sensitivity and accuracy and is slightly influenced by external environmental factors.

Description

technical field [0001] The invention relates to the technical field of small current grounding, in particular to a line selection method and device for grounding faults in a small current grounding system. Background technique [0002] my country's medium-voltage distribution network generally adopts the low-current grounding method, that is, the neutral point is not grounded, the neutral point is grounded through the arc suppression coil, and the neutral point is grounded through the resistor. The advantage is that the fault current is small, the switch does not need to trip immediately when the ground is instantaneous, and the power supply reliability is high. However, for permanent ground faults, such as when the insulation is damaged, it is very easy to develop into a two-point or multi-point ground fault. If an arc is grounded, it will also cause overvoltage in the entire system, damage power equipment, cause property losses, and cause great safety hazards. Hidden dang...

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): G01R31/52G01R31/08H02H7/26
CPCG01R31/086H02H7/262
Inventor 范丙军温进
Owner 邯郸市科维电气有限公司
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