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Cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis

A technology of line-mode current and mixed lines, applied in the direction of fault location, etc., can solve problems such as difficulty in cable fault finding and influence on power supply reliability

Active Publication Date: 2014-11-19
KUNMING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] With the continuous development of the urban distribution network, the proportion of cable feeders and cable hybrid lines in the distribution network is increasing. Most of the distribution network cable line faults have the characteristics of concealment. Feeder is more difficult
Once a failure occurs, it will undoubtedly affect the reliability of power supply

Method used

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  • Cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis
  • Cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis
  • Cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis

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Experimental program
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Embodiment 1

[0024] Embodiment 1: as figure 1 Shown is the cable hybrid direct distribution line system where the measurement end is located at the beginning of the overhead line. Among them, the cable feeder in the cable hybrid line is 10km long, the overhead feeder is 10km long, and the sound line is a 2km long cable and a 25km long overhead feeder. Set feeder L 1 That is, the feeder MN is the fault line, and a single-phase metallic ground fault is set at an interval of 1 km. The initial phase angle of the fault is 90°, and the sampling rate is 1 MHz.

[0025] A method for identifying a fault section of a cable hybrid line using line-mode current for PCA cluster analysis, the specific steps are as follows:

[0026] (1) Denote the sample set formed by taking the absolute value of the fault initial line-mode current traveling wave as P. The sample set is composed of the fault initial line-mode current traveling wave data when the line fails on different sections;

[0027] (2) According ...

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Abstract

The invention relates to a cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis and belongs to the field of electric power system ranging technology. The method comprises the following steps: failure initial line model current travelling wave data of a cable mixed circuit positioned at the beginning end of an overhead line of a measuring end is extracted for PCA cluster analysis; when a failure occurs, the failure initial line model current travelling wave data detected by the measuring end is subjected to PCA cluster analysis to obtain the projection value q 1 of the data on a PC 1 coordinate axis; according to the projection value positioned at the positive semi-axis and the negative semi-axis of the PC 1 coordinate axis, the situation that whether the failure occurs in a cable zone or the overhead line zone can be decided; if q 1 is less than 0, the failure occurs in the overhead line; if q 1 is greater than 0, the failure occurs in a cable circuit. According to the method, the failure initial line model current travelling wave is adopted to position the single-phase ground failures occurred in the cable mixed circuit, evidences are provided for the follow-up travelling wave positioning and the simulation indicates that the method can accurately and reliably detect the failure zone of the cable mixed circuit.

Description

technical field [0001] The invention relates to a method for identifying a fault section of a cable mixed line by using line-mode current for PCA clustering analysis, and belongs to the technical field of electric power system distance measurement. Background technique [0002] The distribution network directly faces users and provides them with electricity services, so it has the widest coverage. There are various types of faults in the distribution network, but according to statistics, single-phase ground faults account for about 80% of distribution network faults. Therefore, the present invention mainly performs simulation for single-phase grounding faults. [0003] With the continuous development of the urban distribution network, the proportion of cable feeders and cable hybrid lines in the distribution network is increasing. Feedlines are more difficult. Once a failure occurs, it will undoubtedly affect the reliability of power supply. Compared with overhead lines,...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春林丹丹戴海琪
Owner KUNMING UNIV OF SCI & TECH
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