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A ground fault line selection method with error correction function

A technology of ground fault and line selection method, applied in the field of power transmission and transformation of power system, can solve the problems of small zero-sequence current and zero-sequence current protection inactive, and achieve the effect of reliable results

Inactive Publication Date: 2019-08-13
李晓明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the transition resistance of the single-phase ground fault is relatively large, the zero-sequence current is small, which may easily cause the zero-sequence current protection to fail to operate.

Method used

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  • A ground fault line selection method with error correction function
  • A ground fault line selection method with error correction function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Schematic diagram of line selection system for small current ground fault with error correction function, such as figure 1 shown. The power source E sends power to the transformer T, and the transformer T sends power to the bus M. Assume that the bus M is connected to N power supply lines, N=6, and the 6 lines are L1, L2, L3, L4, L5, and L6. The information of the bus voltage transformer TV is input into the fault line selection device GZXX, and the information of the current transformers TA1, TA2, TA3, TA4, TA5, TA6 of the 6 power supply lines is input into the fault line selection device GZXX. When the fault line selection device judges from the input information of the voltage transformer that a single-phase ground fault occurs in the power system, the line selection process starts.

[0050] The ground fault line selection method with error correction function proposed by the present invention needs to borrow some existing ground fault line selection methods to join...

Embodiment 2

[0075] The ground fault line selection method with error correction function is:

[0076] (1) Use the first ground fault line selection method to select the fault line from all lines, and directly identify the selected fault line as the highest reliability; then use the second ground fault line selection method to select the fault line from the remaining lines The reliability of the selected faulty line is directly identified as the second; then the third ground fault line selection method is used to select the faulty line from the remaining lines, and the reliability of the selected faulty line is directly identified as the third; And so on.

[0077](2) The faulty line selection device displays the reliability and related information of each line in sequence according to the determined reliability; in general, the reliability and related information of the three lines with higher reliability are displayed in sequence. Can.

[0078] (3) The faulty line selection device trips...

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Abstract

The invention discloses an earth fault line selection method having an error correction function. The method is characterized by, judging whether the difference value of electric quantity change information characteristics of a fault line and a non-fault line surpasses a preset value; if so, directly selecting the fault line; or otherwise, calculating credibility of each line being the fault line and carrying out ranking, and carrying out tripping in sequence according to the large-to-small sequence of the credibility until selecting the fault line. The method can display credibility of a plurality of lines simultaneously; and an operator on duty can select the fault line with reference of the displayed information and with experience being combined, thereby reducing non-fault line power failure and improving power supply reliability of an electric system.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and transformation, in particular to a ground fault line selection method with an error correction function. Background technique [0002] When a single-phase ground fault occurs in a low-current grounding power system, the ground current is relatively small, and the faulty line does not need to be tripped quickly. However, the faulty line selection device is required to select the faulty line so as to arrange power failure and maintenance of the faulty line. [0003] If there are multiple outgoing lines on the busbar, when a single-phase ground fault occurs in the power system, the existing faulty line selection device must select a faulty line from all these outgoing lines, and consider other lines to be non-faulty lines. Its disadvantage is that the fault characteristics of the remaining non-faulty lines are not distinguished. Once the faulty line is selected incorrectly, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 李晓明
Owner 李晓明
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