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A method for estimating the grounding electrode resistance of direct current transmission system by using the average value

A grounding electrode, average value technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc. Reliable effect

Active Publication Date: 2016-03-30
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The voltage of the grounding electrode line is low, and the areas it passes through are mostly mountainous areas, so the probability of line failure is relatively high. When 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 large power grid. The stable operation of the backbone grid has a great influence

Method used

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  • A method for estimating the grounding electrode resistance of direct current transmission system by using the average value
  • A method for estimating the grounding electrode resistance of direct current transmission system by using the average value
  • A method for estimating the grounding electrode resistance of direct current transmission system by using the average value

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 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 resistance is 0.023165Ω / km, and the pole resistance is 0.3Ω. The data sampling rate is 6.4kHz.

[0041] Specific steps are as follows:

[0042] (1) Use the wave recording data before the fault to calculate the average value of the long-time window voltage and current at the measurement terminal of the grounding electrode line:

[0043] =0.486787kV.

[0044] =0.1984289kA

[0045] =0.198359kA

[0046] In the formula: is the long-time window average value of the measured terminal voltage, , are the long-time window average values ​​of the two outlet currents at the measuring end, N is the total number of data in the long time window, Measure the terminal voltage for the ground electrode n The instantaneous value of the adopted point, ( n ) is the measurement terminal current of the ground electrode line 1 n t...

Embodiment 2

[0053] 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 resistance is 0.023165Ω / km, and the pole resistance is 0.23Ω. The data sampling rate is 6.4kHz.

[0054] Specific steps are as follows:

[0055] (1) Use the wave recording data before the fault to calculate the average value of the long-time window voltage and current at the measurement terminal of the grounding electrode line:

[0056] =0.4591422kV.

[0057] =0.1985354kA

[0058] =0.1984659kA

[0059] In the formula: is the long-time window average value of the measured terminal voltage, , are the long-time window average values ​​of the two outlet currents at the measuring end, N is the total number of data in the long time window.

[0060] (2) Calculate the total resistance of the grounding electrode line and the pole site. The total resistance is equal to the long-time window average value of the ground elec...

Embodiment 3

[0066] 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 resistance is 0.00756Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz.

[0067] Specific steps are as follows:

[0068] (1) Use the wave recording data before the fault to calculate the average value of the long-time window voltage and current at the measurement terminal of the grounding electrode line:

[0069] =0.197745kV.

[0070] =0.199146kA

[0071] =0.199146Ka

[0072] In the formula: is the long-time window average value of the measured terminal voltage, , are the long-time window average values ​​of the two outlet currents at the measuring end, N is the total number of data in the long time window, Measure the terminal voltage for the ground electrode n The instantaneous value of the adopted point, ( n ) is the measurement terminal current of the ground electrode line 1 n the...

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Abstract

The invention relates to a method for estimating direct current transmission system grounding electrode address resistance utilizing average values, and belongs to the technical field of electric system distance measurement. According to the method, the long time window average value of the grounding electrode measuring end voltage and the long time window average value of the grounding electrode measuring end two-loop outlet line current are calculated according to the recording data obtained before line faults of a grounding electrode circuit, then, the total equivalent resistance value shown from the measuring end is worked out according to the long time window average value of the grounding electrode measuring end voltage and the long time window average value of the grounding electrode measuring end two-loop outlet line current, and lastly, the resistance value of the grounding electrode address is worked out according to the total equivalent resistance value shown from the measuring end and the resistance value of the grounding electrode circuit. The ground electrode address is estimated based on the existing fault recording data, high-frequency sampling is not needed any more, and the estimation can be carried out in field easily.

Description

technical field [0001] The invention relates to a method for estimating the ground electrode address resistance of a direct current transmission system by using an average value, and belongs to the technical field of electric power system distance measurement. Background technique [0002] The ground electrode line is an indispensable part of the DC transmission system, and the selection of the ground electrode location is relatively difficult in practice. In order to reduce the influence of the ground electrode current on the equipment of the converter station, the pole site of the ground electrode in the DC system is generally selected to be tens to more than one hundred kilometers away from the converter station. Ground electrode leads connected in parallel. [0003] The voltage of the grounding electrode line is low, and the areas it passes through are mostly mountainous areas, so the probability of line failure is relatively high. When the grounding electrode line fail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08
Inventor 束洪春蒋彪田鑫萃董俊
Owner KUNMING UNIV OF SCI & TECH
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