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Correction method for large-sized coaxial-cable insulation space charge measurement

A space charge, coaxial cable technology, used in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as breakdown failure, cable insulation deterioration, and internal field strength distribution distortion in the insulation, and achieve the effect of eliminating the impact.

Active Publication Date: 2015-06-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

If it is used as a DC cable insulation under the action of DC voltage, the accumulation and migration of space charges will form inside the material, which will cause distortion of the internal field strength distribution of the insulation. If the local field strength is too high, it will cause accelerated deterioration of the cable insulation and even eventually breakdown failure.

Method used

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  • Correction method for large-sized coaxial-cable insulation space charge measurement
  • Correction method for large-sized coaxial-cable insulation space charge measurement
  • Correction method for large-sized coaxial-cable insulation space charge measurement

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Embodiment Construction

[0017] The correction process of the influence of the geometric structure on the measurement signal in the space charge measurement based on the insulation of the large-size coaxial cable involved in the present invention will be described with reference to the accompanying drawings.

[0018] like figure 2 As shown, the test is divided into three steps;

[0019] Step 11, according to the geometric structure of the coaxial cable, determine the compensation coefficient r / b of the excitation pulse field strength at r in the cable insulation, and obtain the corrected excitation pulse field strength;

[0020] Step 12, according to the coaxial cable geometry, determine the compensation coefficient of the sound wave density at r in the cable insulation Obtain the corrected sound wave density;

[0021] Step 13: Determine the correction coefficient (r / b) of the space charge signal at r in the cable insulation according to the compensation coefficient of the excitation pulse field s...

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Abstract

The invention relates to a correction method for large-sized coaxial-cable insulation space charge measurement. The correction method specifically comprises the steps of obtaining an exciting pulse field intensity compensation factor, obtaining a sound wave strength compensation factor, correcting geometrical factors of measurement signals and the like. The correction method is applicable to the processing process of the space charge measurement signals of a large-sized coaxial cable sample, by means of a pulse electroacoustic method, the correction factors of the geometrical factors are quantitatively calculated, the geometrical factors of the space charge measurement signals are corrected to eliminate the influence of a coaxial columnar structure of the measured cable sample to the space charge measurement signals and obtain high-accuracy space charge measurement results.

Description

technical field [0001] The invention relates to a correction method for measuring the insulation space charge of a large-size coaxial cable, in particular to a large-size coaxial cable insulation structure, when the space charge measurement calibration and the radial propagation of the sound wave signal are caused by the geometric structure of the test object. Correction method for sound wave intensity weakening. Background technique [0002] With the continuous development of the power system, the HVDC cable transmission system has been increasingly applied not only in the cross-sea power transmission project, but also in the inland power transmission system because of its low transmission loss and easy control of fault current. Cross-linked polyethylene (XLPE), as the main insulating material for high-voltage AC cables, has excellent mechanical and electrical properties and has been widely used. If it is used as a DC cable insulation under the action of DC voltage, the ac...

Claims

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Application Information

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IPC IPC(8): G01R29/24
Inventor 傅明利侯帅张凯钟力生田野卓然
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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