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Relaxation sub-spectral line-based qualitative evaluation method for micro-water content of oiled paper insulating device

A technology of oil-paper insulation and micro-water content, which is used in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as inability to be widely used, and achieve a good evaluation effect.

Inactive Publication Date: 2015-01-14
FUZHOU UNIV
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Problems solved by technology

However, these diagnostic methods lack consideration of the influence of temperature, insulation damp and external interference factors, so they cannot be widely used in practice.

Method used

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  • Relaxation sub-spectral line-based qualitative evaluation method for micro-water content of oiled paper insulating device
  • Relaxation sub-spectral line-based qualitative evaluation method for micro-water content of oiled paper insulating device
  • Relaxation sub-spectral line-based qualitative evaluation method for micro-water content of oiled paper insulating device

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Embodiment Construction

[0030] The technical solution of the present invention will be described in detail below in conjunction with the drawings.

[0031] The flow chart of the method for qualitatively evaluating the micro-water content of oil-paper insulation equipment based on relaxon spectral lines of the present invention, such as figure 1 As shown; it includes the following steps:

[0032] Step 1: Differentiate the measured depolarization current spectrum line to obtain the differential spectrum function :

[0033] (2)

[0034] Step 2: From the differential spectrum function Start at the end, take two points arbitrarily , , Establish the following equations:

[0035] (3)

[0036] Find the unknown quantity by formula (3) I d1 with Substitution , You can find the first subspectral line L 1 ;

[0037] Step 3: Change the differential spectrum Subtract the first sub-line L 1 Obtain the remaining differential spectrum . From the remaining differential spectrum Starting ...

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Abstract

The invention relates to a relaxation sub-spectral line-based qualitative evaluation method for micro-water content of an oiled paper insulating device. The method comprises the steps of firstly measuring depolarization current of the oiled paper insulating device, then sequentially spectrum unfolding on a depolarization current derivative spectrum function, displaying the micro-water content information inside the depolarization current in a form of sub-spectral lines, and qualitatively evaluating the micro-water content of the oiled paper insulating device. If more sub-spectral lines are analyzed from the depolarization current spectrum line of the oiled paper insulating device, the micro-water content of the oiled paper insulating device is higher, and otherwise, if fewer sub-spectral lines are analyzed from the derivative spectrum, the micro-water content of the oiled paper insulating device is lower. By adopting the evaluation method, an intuitive and accurate analysis means is provided for the qualitative evaluation on the micro-water content of the oiled paper insulating device.

Description

technical field [0001] The invention proposes a qualitative evaluation method for the micro-water content of oil-paper insulation equipment based on relaxor spectral lines, and the method relates to the technical field of evaluation of micro-water content of oil-paper insulation equipment. Background technique [0002] At present, the main methods used to evaluate the moisture content of oil-paper insulation are: Karl Fischer titration method, dew point method, oil-paper moisture balance relationship curve method, and electrical diagnosis method based on dielectric response theory. The Karl Fischer titration method needs to extract insulation samples from the inside of the oil-paper insulation equipment for testing, which may cause damage to the equipment during the sampling process; the test process of the dew point method needs to break the vacuum, and it is difficult to obtain experimental data; the oil-paper moisture balance curve method is used There is also a certain l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/60
Inventor 蔡金锭曾静岚李安娜彭积成
Owner FUZHOU UNIV
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