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Lightning strike interference and fault identification method for transmission lines based on transient waveform characteristics

A transient waveform, transmission line technology, applied in fault location, fault detection according to conductor type, measurement of electricity, etc., can solve the problem of reduced sensitivity of identification criteria, and achieve the effect of high sensitivity and reliability

Active Publication Date: 2020-08-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In addition, under certain fault conditions, the identification method based on transient current monotonicity is affected by the power frequency power of the line, and the sensitivity of its identification criterion will decrease

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  • Lightning strike interference and fault identification method for transmission lines based on transient waveform characteristics
  • Lightning strike interference and fault identification method for transmission lines based on transient waveform characteristics
  • Lightning strike interference and fault identification method for transmission lines based on transient waveform characteristics

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Embodiment Construction

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] The invention proposes a lightning strike interference and fau...

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Abstract

The invention discloses a power transmission line lightning stroke interference and fault identification method based on transient waveform characteristics. The identification method comprises the following steps of: S1: after a transient quantity protection starting criterion is actuated, acquiring an additional component current of each phase at a line protection installation position, and calculating ground mold and line mold components according to a Karenbauer transformation matrix; S2: according to an energy ratio criterion of the transient ground mold and line mold components, identifying lightning stroke interference, and if the criterion is smaller than a setting, carrying out next identification; and S3: carrying out mean sliding denoising on the additional component current of each phase to acquire a waveform of a main wave, carrying out fitting on the waveform of the main wave, and identifying lightning stroke interference and a fault of each phase line according to a fitting decision coefficient. The power transmission line lightning stroke interference and fault identification method can accurately identifying different types of lightning stroke interference and faults, is not influenced by a fault initial angle, a transition resistance, a line compensation device and the like, has high sensitivity and reliability, is applicable to different types of power transmission lines, and provides beneficial bases for the practical process of transient quantity protection.

Description

technical field [0001] The invention relates to the technical field of power system fault identification, in particular to a lightning strike interference and fault identification method for transmission lines based on transient waveform characteristics. Background technique [0002] With the rapid development of power electronic power systems, on the one hand, higher requirements are put forward for the quickness of relay protection. On the other hand, line FACTS components and inverter power supply bring uncertainty to traditional power frequency protection. sex. Transient quantity protection has attracted extensive attention from scholars at home and abroad because it can make full use of the rich fault characteristic information in the fault transient state and can effectively improve the protection speed. However, the data window length of transient quantity protection is usually a few milliseconds. When the transmission line is disturbed by lightning strikes, its tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/08
CPCG01R31/00G01R31/085
Inventor 王增平吕哲许琬昱
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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