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Fault line identification method based on high-frequency fault information energy evaluation

A technology of fault lines and fault information, applied in fault locations and other directions, can solve problems such as difficult separation, and achieve the effect of improving identification accuracy

Pending Publication Date: 2022-04-12
BINZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

These additional currents are superimposed on the weak fault current and cannot be easily separated

Method used

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  • Fault line identification method based on high-frequency fault information energy evaluation
  • Fault line identification method based on high-frequency fault information energy evaluation
  • Fault line identification method based on high-frequency fault information energy evaluation

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Embodiment Construction

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0061] Such as Figures 1 to 3 As shown, the present invention provides a fault line identification method based on high-frequency fault information energy evaluation, the method comprising:

[0062] S101, analyzing the characteristic data of the traveling wave transmission process;

[0063] Small current grounding system wiring such as image 3 shown. Let line L 1 Failure at time t, such as Figure 4 As shown, MB is one of the non-faulty lines, and there a...

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Abstract

The invention provides a fault line identification method based on high-frequency fault information energy evaluation, and the method comprises the steps: carrying out the analysis of a high-frequency transient traveling wave process during the single-phase grounding fault of a small-current grounding system, accumulating the contribution rate according to each principal component, selecting a plurality of principal components, and better maintaining the information of an original variable. A fault line identification algorithm is further provided based on principal component analysis. And starting from the essential characteristics of the high-frequency signal, the basic characteristics of the fault can be accurately grasped, and the fault line identification accuracy based on the high-frequency information is greatly improved.

Description

technical field [0001] The invention relates to the field of line fault identification, in particular to a fault line identification method based on energy evaluation of high-frequency fault information. Background technique [0002] The most commonly used neutral point grounding methods in modern power systems are direct grounding, non-grounding and arc-suppression coil grounding. For medium-voltage power systems of 66kv and below, reducing the insulation level becomes a relatively secondary factor, and other grounding methods affect Aspects of factors become the main consideration in choosing a grounding method. In this case, starting from different angles and specific issues, different grounding methods have been adopted. The typical grounding methods of the distribution network are ungrounded, grounded through the arc suppression coil, grounded through low resistance or grounded through low reactance. my country's distribution network system widely adopts non-effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 刘爱民李金成袁洪凯董永强张连国刘延清张佳聂兴成刘健刘伟李蓬
Owner BINZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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