Earth fault phase identification method based on injection method

An identification method and ground fault technology, applied in the field of ground fault phase identification based on the injection method, can solve problems such as inapplicability and difficulty in identification of the power grid ground phase

Active Publication Date: 2015-09-02
CHINA UNIV OF MINING & TECH
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In reality, due to the unbalance of the three phase-to-ground parameters of the power grid, this brings certain difficulties to the identification of the ground phase of the power grid, especially when a high-resistance ground fault occurs, the traditional ground phase identification is not applicable

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
  • Earth fault phase identification method based on injection method
  • Earth fault phase identification method based on injection method
  • Earth fault phase identification method based on injection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] The specific content of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] The present invention injects current Compensate the voltage caused by grid asymmetry, so that the neutral point voltage It is only the neutral point displacement voltage caused by the fault phase, analyze the phase angle of the neutral point voltage after compensation, infer the range of the neutral point voltage phase angle with the fault resistance, and finally pass the corresponding neutral point voltage when the ground fault occurs in different phases. The range of point voltage phase angle is used to identify the ground fault phase, especially to realize the identification of high resistance ground fault phase. Specifically include the following steps.

[0050] (1) Determine the phase angle θ according to the system parameters (total system capacitance and damping rate) nor and the compensation state of the arc suppre...

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 disclose an earth fault phase identification method based on an injection method. The earth fault phase identification method includes the steps of (1) determining a phase angle Theta nor and the compensation state of an arc extinguishing coil based on system parameters (system total capacitance and damping ratio); (2) injecting current to a neutral point to obtain a compensated neutral point voltage when a power grid has single-phase earth faults; (3) determining the range of the compensated neutral point voltage phase angle a varying along the fault resistance when each phase has the single earth faults; and (4) determining the phase angle a falling into which variation range in step (3) based on the measured phase angle a of the neutral point voltage to determine whether the phase corresponding to the variation range has earth faults or not. The earth fault phase identification method based on the injection method can effectively realize the system earth fault phase identification, particularly realize the high-resistance earth fault phase identification, thereby overcoming the limitation of a conventional fault phase identification method and having better application prospects.

Description

technical field [0001] The invention relates to the technical field of fault phase identification of a power system grid, in particular to a ground fault phase identification method based on an injection method. Background technique [0002] my country's medium-voltage distribution network is mainly based on the small current grounding method. The commonly used methods are the neutral point grounding method through the arc suppression coil and the neutral point non-grounding method. With the rapid development of the distribution network system, the system single-phase The frequency of ground faults is increasing. In reality, due to the unbalance of the three phase-to-ground parameters of the power grid, it brings certain difficulties to the identification of the ground phase of the power grid, especially when a high-resistance ground fault occurs, the traditional ground phase identification is not applicable. Contents of the invention [0003] The object of the...

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): G01R31/08
Inventor 李晓波丁欣闫腾飞刘建华董新伟李国新张栋梁马草原梁睿蒋峰景李康
Owner CHINA UNIV OF MINING & TECH
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