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A Ground Fault Location Method for DC Transmission Converter

A ground fault and location method technology, applied in the power field, can solve problems such as unfavorable identification of fault areas, increased workload and difficulty of operators, and inability to identify fault areas, and achieves the effect of rapid positioning.

Active Publication Date: 2020-09-25
ANNING BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the DC differential protection can detect the ground fault inside the converter, it cannot identify the fault area, which is not conducive to the operation and maintenance personnel to quickly and accurately identify the fault area
In order to identify the fault area, the operator can only analyze the possible fault point through the waveform and check the equipment, which increases the workload and difficulty of the operator

Method used

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  • A Ground Fault Location Method for DC Transmission Converter
  • A Ground Fault Location Method for DC Transmission Converter
  • A Ground Fault Location Method for DC Transmission Converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] see figure 2 As shown, a method for locating a ground fault of a DC transmission converter in this embodiment includes the following steps:

[0043] 201. Divide the inverter area into three areas, namely the first area, the second area and the third area, and the specific division is as follows figure 1 shown, wherein, the first area includes the part between the current transformer at the high-voltage end of the converter and the three-phase current transformer of the Y / Y converter valve side bushing; the second area includes the Y / Y converter converter The part between the three-phase current transformer of the valve side bushing and the three-phase current transformer of the Y / D converter valve side bushing; the third area includes the three-phase current transformer of the Y / D converter valve side bushing The part between the high-end current transformer of the converter;

[0044] 202. When the DC current difference between the high-voltage end of the converter a...

example 1

[0072] When the K1 fault occurs, there must be a current difference of 1 between the current IdH of the high-voltage side of the converter and the current of the low-voltage side of the converter IdN. In addition, under the premise that both the Y bridge and the D bridge can be commutated normally, the maximum value of the absolute value of the three-phase current of the Y / Y converter valve side bushing IvY_MAX, the Y / D converter valve side bushing three-phase The maximum value of the absolute value of the current IvD_MAX is equal to the current IdN of the low-voltage side of the converter, so the absolute value of the difference 2 is greater than the fixed value 2, while the absolute value of the difference 3 is less than the fixed value 3, and the absolute value of the difference 4 is less than the fixed value. The value is 4, so the present invention determines that a ground fault has occurred in the first area.

example 2

[0074] When the K2 fault occurs, assuming that the bridge arm No. 3 and bridge arm No. 4 of the Y bridge are turned on, there must be a current difference of 1 between the current IdH of the high-voltage side of the converter and the current IdN of the low-voltage side of the converter. , the absolute value of the difference 1 must be greater than the fixed value 1. In addition, the maximum value IvY_MAX of the absolute value of the three-phase current of the Y / Y converter valve side bushing, the maximum value of the absolute value of the three-phase current of the Y / D converter valve side bushing IvD_MAX, and the low-voltage side current IdN of the converter are equal , so the absolute value of the difference 2 is greater than the fixed value 2, while the absolute value of the difference 3 is smaller than the fixed value 3, and the absolute value of the difference 4 is less than the fixed value 4, so the present invention determines that a ground fault has occurred in the firs...

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PUM

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Abstract

The invention discloses a grounding fault positioning method for a direct-current transmission converter. The method comprises the following steps that: a converter area is divided into three regions,i.e., a first region, a second region and a third region; and when a direct current difference value between the high-voltage end of the converter and the low-voltage end of the converter is greaterthan a fixed value, and the current difference value of a certain region in the converter is also greater than the fixed value, it is judged that a grounding fault occurs in the region. According to the method of the invention, the converter area is divided into the three regions; differential protection is set for each region, and a corresponding constant value setting method is provided; and therefore, the region where the grounding fault occurs can be determined when the grounding fault occurs in the converter region, and an operator can be facilitated to quickly locate and process fault equipment.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for locating a ground fault of a DC power transmission converter. Background technique [0002] The converter is a device that realizes the mutual conversion of alternating current and direct current, and is the core device in the DC transmission system. figure 1 The structure of the converter and the configuration of the current transformer are given. For the converter with this structure, the DC differential protection is generally set to detect the ground fault inside the converter. The specific logic is as follows: [0003] IdH-IdN>I_set(1) [0004] Although the DC differential protection can detect the ground fault inside the converter, it cannot identify the fault area, which is not conducive to the operation and maintenance personnel to quickly and accurately identify the fault area. In order to identify the fault area, the operator can only analyze ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H7/26G01R31/08
CPCG01R31/086H02H7/268H02J3/36Y02E60/60Y04S10/52
Inventor 黄剑湘杨涛李浩李少森孙豪韩建伟颜波任君朱旭东杨光鞠翔杨铖赵潇邓本飞刘超李德荣朱盛强丁丙侯梁钰华付天乙
Owner ANNING BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION