Phase judgment method for transmission line faults

A technology of transmission lines and determination methods, which is applied in the direction of fault location, measurement of electricity, measurement of electrical variables, etc., can solve the problem of no way to know power frequency information, and achieve the effect of reducing information costs

Inactive Publication Date: 2019-01-18
HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because no equipment is installed on the faulty line, there is no way to know the power frequency information
Although the cost of power grid operation and equipment maintenance is reduced, the information of fault power frequency is also reduced, which brings greater challenges to fault diagnosis, especially the judgment of fault phase

Method used

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  • Phase judgment method for transmission line faults
  • Phase judgment method for transmission line faults
  • Phase judgment method for transmission line faults

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Embodiment Construction

[0038] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0039] see figure 1 , a transmission line fault phase identification method, using Teager-Kaiser energy operator to determine the transmission line fault phase, the specific steps are:

[0040] S1. Obtain the discrete current signal of the three-phase current traveling wave at the fault of the transmission line through the transmission line monitoring device;

[0041] S2. Preprocessing the discrete current signal using a Teager-Kaiser energy operator to obtain an instantaneous energy sequence of the three-phase current traveling wave signal;

[0042] S3. Obtain the energy amplitude of the three-phase current traveling wave signal according to the instantaneous energy sequence;

[0043] S4. Sorting and normalizing the energy amplitudes, and establishing a pl...

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Abstract

The invention provides a phase judgment method for transmission line faults. The method comprises the following steps: obtaining energy components in traveling waves by using Teager-Kaiser energy operator, then converting the energy components into a relative relation of three-phase traveling wave energy, describing the relative relation into points in a plane-coordinate system, and then judging fault phase by observing an area where the points are. According to the method, the dependency on fault moment power frequency waveform in the prior art is avoided, so that the information cost of fault diagnosis is reduced effectively, the tendency of current smart power grid construction and updating is met, and the accuracy of judging the transmission line faults is improved greatly.

Description

technical field [0001] The invention relates to the technical field of fault identification of transmission lines, in particular to a method for differently judging transmission line faults. Background technique [0002] In the existing fault location technology, the fault phase is judged by the power frequency current waveform. The principle is that the short-circuit current in the fault phase is much larger than that of the non-fault phase. Therefore, the three-phase power frequency current waveform at the time of the fault is collected, and its amplitude is compared. However, the hardware basis of this technology is the installation of high-density distributed fault monitoring devices. The prerequisite is that each line with power flow is equipped with signal acquisition equipment, so each line can be monitored power frequency operation. [0003] However, due to the continuous upgrading of the power grid and the update and iteration of traveling wave positioning technolo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor赵海龙庞松岭陈钦柱林桃贝
OwnerHAINAN POWER GRID CO LTD ELECTRIC POWER RES INST