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Line selection method and system for low-current grounding fault

A technology of small current grounding and fault line selection, which is applied in the field of power transmission and transformation of power systems, can solve problems such as low device action accuracy, inability to analyze and process fault information again, and fault information not being fully utilized, so as to improve the reliability of power supply High performance and high accuracy

Inactive Publication Date: 2017-03-15
李晓明
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fault information can only be processed once, and once an error is found, the fault information of other lines cannot be analyzed and processed again
Fault information has not been fully utilized, resulting in the existing fault line selection method and device action accuracy rate is not high

Method used

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  • Line selection method and system for low-current grounding fault

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Schematic diagram of the line selection system for small current ground faults, 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.

[0038] The basic principle of the faulty line selection method of the present inven...

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Abstract

The invention discloses a line selection method and system for a low-current grounding fault. Whether electric quantity changing information features of a fault line and a non-fault line exceed a preset value is determined; if so, a fault line is selected; and if not, fault confidence levels of all non-fault lines are calculated and ranking is carried out, tripping is carried out successively according to a descending order of the fault confidence levels until a fault line is selected. Confidence levels of multiple lines can be displayed simultaneously and the fault line is selected according to the descending order of the fault confidence levels, so that power failures of the non-fault lines are reduced and power supply reliability of the power system is improved.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation in power systems, in particular to a method and system for line selection for small current grounding faults. 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 work of 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 ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 李晓明
Owner 李晓明
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