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Method for determining power cable partial discharge defect type based on spectral analysis

A partial discharge and power cable technology, which is applied in the direction of testing dielectric strength, can solve problems such as cable insulation degradation and defect expansion, and achieve the effects of high accuracy, simple steps, and improved intelligence and detection efficiency

Inactive Publication Date: 2015-12-30
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0002] When there is an insulation fault in the power cable, partial discharge phenomenon often occurs, and the partial discharge phenomenon will cause the expansion of defects and the deterioration of cable insulation

Method used

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  • Method for determining power cable partial discharge defect type based on spectral analysis
  • Method for determining power cable partial discharge defect type based on spectral analysis
  • Method for determining power cable partial discharge defect type based on spectral analysis

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Embodiment

[0079] Such as figure 1 It is a block flow diagram of a method for discriminating the partial discharge defect type of a power cable based on frequency spectrum analysis of the present invention, and a specific discrimination process of the partial discharge defect type of a power cable comprises the following steps:

[0080] (1) Read the time-domain waveform of the current power cable partial discharge collected by the power cable partial discharge detection instrument after removing background noise and interference.

[0081] (2) Normalize the read waveform, and use s(t) to represent the time-domain signal of a single partial discharge waveform, and normalize the signal s(t) as follows:

[0082] s ^ ( t ) = s ( t ) ∫ s ...

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Abstract

A method for determining a power cable partial discharge defect type based on spectral analysis comprises the following steps: 1) reading a power cable partial discharge amount time-domain waveform which is free of background noise and interference and collected by a power cable partial discharge detecting instrument, performing equivalent time-frequency analysis on the obtained partial discharge time-domain waveform, performing normalization processing on signals, performing time-domain conversion on the normalized signals, converting time-domain characteristic waveform to a frequency-domain waveform to obtain a frequency-domain characteristic pattern of the partial discharge waveform, and extracting a corresponding partial discharge waveform frequency spectrum characteristic value; performing other steps. The method has the benefits that the detection speed and accuracy are high, and the detection procedure is simple; a visualized power cable partial discharge frequency-domain oscillogram is output, so that the power cable defect style can be intuitively assessed by a detector, and the intelligence level of power cable partial discharge detection and the detection efficiency can be improved.

Description

technical field [0001] The invention relates to a method for discriminating a partial discharge defect type of a power cable, in particular to a method for discriminating a partial discharge defect type of a power cable based on partial discharge waveform spectrum analysis, and belongs to the technical field of electric power industry detection. Background technique [0002] When there is an insulation fault in the power cable, partial discharge often occurs, and the partial discharge will cause the expansion of the defect and the deterioration of the cable insulation. Therefore, partial discharge is sensitive to early faults of power cable insulation. Partial discharge detection of power cables is an effective means to detect the state of cable insulation. It has been widely used in the process of commissioning, maintenance and repair of cables. [0003] However, there are various types of partial discharge and representative faults, and as an important parameter in the det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 董涛张泓张博刘柱揆毕志周于虹程志万
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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