Small current grounding system single-phase grounding line selection method and system

A low-current grounding, single-phase grounding technology, applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc., can solve the problems of decreased line selection accuracy, difficult to distinguish the relationship between amplitude, magnitude and phase, and reduce faults. Time, fast locking, and high accuracy of line selection

Pending Publication Date: 2020-12-18
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventor believes that due to the compensation effect of the arc suppression coil, the zero-sequence current of the fault line is changed, making it difficult to distinguish the fault quantity of the fault line from the normal line, no matter in terms

Method used

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  • Small current grounding system single-phase grounding line selection method and system
  • Small current grounding system single-phase grounding line selection method and system
  • Small current grounding system single-phase grounding line selection method and system

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] like figure 1 As shown, this embodiment provides a single-phase grounding line selection method for a low-current grounding system, including:

[0033] S1: Decompose the zero-sequence current of each feeder collected under a single-phase ground fault into a transient component and an attenuated DC component;

[0034] S2: According to the transient threshold, judge whether the transient component of each feeder is normal, and construct a transient energy line selection matrix according to the judgment result;

[0035] S3: According to the attenuated DC threshold, judge whether the attenuated DC component of each feeder is normal, and construct a line selection matrix of attenuated DC components according to the judgment result;

[0036] S4: Union the transient energy line selection matrix and the attenuation DC component line selection matrix to obtain a comprehensive line selection matrix, and compare the comprehensive line selection matrix with a p...

Example Embodiment

[0067] Example 2

[0068] This embodiment provides a single-phase grounding line selection system for a low-current grounding system, including:

[0069] The decomposition module is used to decompose the zero-sequence current of each feeder collected under a single-phase ground fault into a transient component and an attenuated DC component;

[0070] The transient energy line selection matrix building module is used to judge whether the transient component of each feeder is normal according to the transient threshold value, and construct the transient energy line selection matrix according to the judgment result;

[0071] Attenuated DC component line selection matrix building module, which is used to judge whether the attenuated DC component of each feeder is normal according to the attenuation DC threshold value, and build the attenuation DC component line selection matrix according to the judgment result;

[0072] The judgment module is used to combine the transient energy ...

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Abstract

The invention discloses a low-current grounding system single-phase grounding line selection method and system. The method comprises the steps: decomposing zero-sequence current, collected under a single-phase grounding fault, of each feeder line into a transient component and an attenuation direct-current component; judging whether the transient component of each feeder line is normal or not according to the transient threshold value, and constructing a transient energy line selection matrix according to a judgment result; judging whether the attenuation direct-current component of each feeder line is normal or not according to the attenuation direct-current threshold value, and constructing an attenuation direct-current component line selection matrix according to a judgment result; andmerging the transient energy line selection matrix and the attenuation direct current component line selection matrix to obtain a comprehensive line selection matrix, and comparing the comprehensive line selection matrix with a preset normal matrix to obtain a line where the fault point is located. A fault line can be rapidly locked, and fault time is reduced.

Description

technical field [0001] The invention relates to the technical field of distribution network relay protection, in particular to a single-phase grounding line selection method and system for a small current grounding system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The small current grounding system refers to the three-phase system in which the neutral point is not grounded or is grounded through the arc suppressing coil and high impedance, also known as the neutral point indirect grounding system; Fault currents are often much smaller than load currents. In the distribution network, through the radiation effect of several feeders in the substation, the power supply to large-scale user areas is realized; due to the large scale of outgoing lines and the harsh operating environment, single-phase ground faults are prone to occur on the ...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/58G01R19/165
CPCG01R31/52G01R31/58G01R19/16571G01R19/16576Y04S10/52
Inventor 韩兴磊刘烨牟磊马晓路刘嘉超孙振海张弘石峥孙伟涛彭寅宋彦臻
Owner STATE GRID SHANDONG ELECTRIC POWER
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