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

A Fault Location Method for DC Grounding Electrode Line Using DC Component and Harmonic Component Intersection Location

A technology of DC component and harmonic component, applied in the fault location and other directions, can solve the problems of large influence of transition resistance, poor anti-interference ability, strong anti-interference ability, etc., to achieve the effect of convenient implementation, simple principle and low sampling rate

Active Publication Date: 2016-06-08
KUNMING UNIV OF SCI & TECH +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The fault location method of the ground electrode line using the DC component has strong anti-interference ability, but it is greatly affected by the transition resistance
The method of using harmonic dominant frequency components for grounding line fault location is less affected by transition resistance, but has poor anti-interference ability

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
  • A Fault Location Method for DC Grounding Electrode Line Using DC Component and Harmonic Component Intersection Location
  • A Fault Location Method for DC Grounding Electrode Line Using DC Component and Harmonic Component Intersection Location
  • A Fault Location Method for DC Grounding Electrode Line Using DC Component and Harmonic Component Intersection Location

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: 800kV DC grounding line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 60km away from the measuring end, and the transition resistances are 4Ω.

[0038] The DC grounding electrode line fault location method using DC component and harmonic component cross-line location is characterized in that the specific steps are as follows:

[0039] (1) Extract the DC component U of the voltage at the measuring terminal of the ground electrode lead M And the DC component I of the two-circuit outlet current de1 , I de2 , using the DC component method, the functional relationship between the fault distance and the transition resistance can be obtained according to the impedance relationship:

[0040] When the fault point voltage is higher than the pole point voltage, ac...

Embodiment 2

[0061] Example 2: 800kV DC grounding line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 40km away from the measuring end, and the transition resistances are 2Ω.

[0062] The DC grounding electrode line fault location method using DC component and harmonic component cross-line location is characterized in that the specific steps are as follows:

[0063] (1) Extract the DC component U of the voltage at the measuring terminal of the ground electrode lead M And the DC component I of the two-circuit outlet current de1 , I de2 , using the DC component method, the functional relationship between the fault distance and the transition resistance can be obtained according to the impedance relationship:

[0064] When the fault point voltage is higher than the pole point voltage, ac...

Embodiment 3

[0085] Example 3: 800kV DC grounding line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 1MHz. Ground electrode line l 2 A ground fault occurred 70km away from the measuring end, and the transition resistances were 2Ω.

[0086] The DC grounding electrode line fault location method using DC component and harmonic component cross-line location is characterized in that the specific steps are as follows:

[0087] (1) Extract the DC component U of the voltage at the measuring terminal of the ground electrode lead M And the DC component I of the two-circuit outlet current de1 , I de2 , using the DC component method, the functional relationship between the fault distance and the transition resistance can be obtained according to the impedance relationship:

[0088] When the fault point voltage is higher than the pole point voltage, a...

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 relates to a DC grounding electrode line fault distance measurement method using the cross-line positioning of DC components and harmonic components, and belongs to the technical field of power system distance measurement. The present invention measures the DC component of the measuring terminal voltage of the grounding electrode lead wire and the DC components of the two outgoing line currents respectively when a fault occurs in the grounding electrode line, obtains the functional relationship between the fault distance and the transition resistance through the DC component method, and then obtains the functional relationship between the fault distance and the transition resistance through the harmonic component The functional relationship between the fault distance and the transition resistance is obtained by using the method, and the location of the fault point that satisfies the two functional relationships is determined according to the functional relationship curve of the DC component and the harmonic component. The invention utilizes the single-end information volume of the line, has simple principle, low sampling rate and is convenient to realize. The combination of DC component and harmonic component has certain anti-interference ability, and is less affected by transition resistance.

Description

technical field [0001] The invention relates to a DC grounding electrode line fault distance measurement method using the cross-line positioning of DC components and harmonic components, and belongs to the technical field of power system distance measurement. Background technique [0002] The ground electrode is an indispensable part of the DC transmission system. The voltage of the grounding electrode line is low, and the areas passing through are mostly mountainous areas, and the probability of line failure is relatively high. After the grounding electrode line fails, it will affect the DC bipolar system, which not only has a great impact on the safe operation of the DC system, but also has a great impact on the backbone grid of the large power grid. Stable operation has a great impact. In order to ensure the stable operation of the backbone power grid, a new ranging method is urgently needed to determine the fault location. The fault ranging based on the existing transie...

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 Patents(China)
IPC IPC(8): G01R31/08
Inventor 束洪春冯海欧龚石磊董俊
Owner KUNMING UNIV OF SCI & TECH