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A fault wave-record-data-based frequency domain fault distance measurement method for a high-voltage direct current grounding electrode line.

A technology of fault recording and fault location, which is applied in the direction of the fault location, etc., can solve the problems of inability to measure distance, great influence on the safe operation of the DC system, and great influence on the stable operation of the backbone network frame of the Southern Power Grid, etc., so as to be easy to realize on site Effect

Inactive Publication Date: 2014-03-26
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The voltage level of the ground electrode line is low, and the probability of line failure is relatively high. After the ground 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 stable operation of the backbone grid of the Southern Power Grid.
At present, most of the grounding electrode lines are equipped with pulse traveling wave ranging devices, but when the grounding electrode line is faulty, the distance cannot be measured many times.

Method used

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  • A fault wave-record-data-based frequency domain fault distance measurement method for a high-voltage direct current grounding electrode line.
  • A fault wave-record-data-based frequency domain fault distance measurement method for a high-voltage direct current grounding electrode line.
  • A fault wave-record-data-based frequency domain fault distance measurement method for a high-voltage direct current grounding electrode line.

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.00756+j0.39999Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 10km away from the measuring end, and the transition resistance is 0Ω.

[0037] (1) Extract the main frequency component of the electrical quantity at the measuring terminal. Using Fast Fourier Transform (FFT), the window function selects the Chebyshev window, the length of the data window is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600Hz is extracted. Calculate the voltage electric current amplitude and phase of

[0038] (2) Calculate the voltage along the line according to the Chinese formula (1) of the content of the invention

[0039] (3) According to the content of the invention Chinese formula (2) ...

Embodiment 2

[0040] Example 2: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.00756+j0.39999Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 20km away from the measuring end, and the transition resistance is 2Ω.

[0041] Specific steps are as follows:

[0042] (1) Extract the main frequency component of the electrical quantity at the measuring terminal. Using Fast Fourier Transform (FFT), the window function selects the Chebyshev window, the length of the data window is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600Hz is extracted. Calculate the voltage electric current amplitude and phase of

[0043] (2) Calculate the voltage along the line according to the Chinese formula (1) of the content of the invention

[0044] (3) According to the cont...

Embodiment 5

[0045] Example 5: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the line impedance is: 0.00756+j0.39999Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 30km away from the measuring end, and the transition resistance is 0.2Ω.

[0046] Specific steps are as follows:

[0047] (1) Extract the main frequency component of the electrical quantity at the measuring terminal. Using Fast Fourier Transform (FFT), the window function selects the Chebyshev window, the length of the data window is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600Hz is extracted. Calculate the voltage electric current amplitude and phase of

[0048] (2) Calculate the voltage along the line according to the Chinese formula (1) of the content of the invention ;

[0049] (3) According to the co...

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Abstract

The invention provides a fault wave-record-data-based frequency domain fault distance measurement method for a high-voltage direct current grounding electrode line, and belongs to the technical field of electric power system protection and distance measurement. Bases on existing wave-record-data, a lot of harmonic wave components included in voltage currents detected by a measurement end are superposed direct current components, and harmonic wave dominant frequency components are extracted through a signal processing method. Voltage currents along lines can be calculated through voltages measured at the measurement end. A fault distance measurement function can be obtained according to a characteristic that the grounding impedance of a fault point is pure resistance and an imaginary part of an impedance expression thereof is zero, and a fault distance is calculated by means of solving the fault distance measurement function.

Description

technical field [0001] The invention relates to a frequency-domain fault distance measurement method of a high-voltage DC grounding electrode line based on fault wave recording data, and belongs to the technical field of power system protection and control. Background technique [0002] The grounding electrode line is an indispensable part of the DC transmission system. The DC system converter station is generally tens to more than one hundred kilometers away from the grounding point, and a grounding electrode lead wire connected in parallel with two conductors is usually erected between them. [0003] The voltage level of the ground electrode line is low, and the probability of line failure is relatively high. After the ground 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 stable operation of the backbone grid of the Southern Power Grid. . At present, m...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 张怿宁束洪春夏谷林田庆蒋彪田开庆
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID