Feeder line singlephase fault and multiphase fault distance measuring method based on wavelet decomposition frequency band feature

A technology of frequency band characteristics and wavelet decomposition, applied in the direction of fault location, etc., can solve problems such as poor pertinence and large error of fault distance measurement, and achieve the effects of speeding up search, improving power supply reliability, and high economic benefits

Inactive Publication Date: 2005-04-13
TIANJIN UNIV
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Problems solved by technology

[0003] Most of the research on the fault location problem of the distribution network feeder is in the theoretical stage, and a few practical devices are generally borrowed from the high-voltage line fault location device, and there are disadvantages such as poor pertinence and large fault location error.

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  • Feeder line singlephase fault and multiphase fault distance measuring method based on wavelet decomposition frequency band feature
  • Feeder line singlephase fault and multiphase fault distance measuring method based on wavelet decomposition frequency band feature
  • Feeder line singlephase fault and multiphase fault distance measuring method based on wavelet decomposition frequency band feature

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] Embodiments of the single-phase ground fault ranging method of the present invention:

[0047] In the non-effectively grounded distribution network system, due to the existence of uncertain factors such as the variable operation mode, the complexity of fault types and characteristics, in order to ensure the accuracy of fault location, layer by layer exclusion was carried out in the research method. First of all, it is a breakthrough to use the non-fault phase transient current component (Transient Current Component——TCC) as the basic basis for fault location, which can overcome the influence of system parameters and changing operation modes. The validity of the analysis provides an important guarantee; secondly, to eliminate the influence of the load current, according to Δi=i 后 -i 前 Find the fault component to guarantee. where i 后 is the instantaneous val...

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Abstract

The invention discloses a feeder line single phase fault and multiphase fault distance measuring method based on wavelet decomposition frequency band feature, wherein the single phase fault distance measuring method consists of using non-fault phase transient current composition as the fault distance measurement information, and carrying out data acquisition, earth connection error protection detecting, obtaining fault recording wave data, extracting frequency band characteristic measurement vector by using orthogonal wavelet packet decomposition, angular correction treatment to the frequency band characteristic measurement vector and neural net computation. The multiphase fault distance measuring method utilizes the failure current information as the fault distance measurement basis.

Description

technical field [0001] The invention belongs to fault distance measurement of feeder lines of power distribution system, in particular to a method for fault distance measurement of power distribution network feeder lines based on wavelet decomposition frequency band characteristics. Background technique [0002] In my country's power distribution system, the neutral point grounding method generally adopts two methods of non-grounding or arc suppression coil grounding, which are collectively referred to as small current grounding systems. When a single-phase ground fault occurs, the ground current at the fault point is only related to the capacitive current of the system and the inductance current compensated by the arc suppression coil. There is no short-circuit current in single-phase ground faults, only capacitive or inductive currents to ground are sensitive to uncertain factors in network operation, which has always been a difficult problem in the research of fault locat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 孙雅明苗友忠
Owner TIANJIN UNIV
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