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Insulator surface charge rapid dissipation method and device based on X-rays

A surface charge and insulator technology, applied in the field of electricity, can solve problems such as high cost, complicated material processing technology, and damage to material integrity, and achieve the effects of ensuring integrity, simple operation, and flexible design

Active Publication Date: 2020-10-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, material processing may destroy the integrity of the material, introduce unevenly distributed charges, and cannot completely eliminate the accumulation of charges on the surface of GIL insulators
In addition, the material processing process is complicated and the cost is high

Method used

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  • Insulator surface charge rapid dissipation method and device based on X-rays
  • Insulator surface charge rapid dissipation method and device based on X-rays
  • Insulator surface charge rapid dissipation method and device based on X-rays

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The principle of the present invention is as follows: X-ray wavelength is about 0.012-0.005 nanometers, and has relatively high energy. Therefore, X-rays are used to irradiate the surface of the insulator that has accumulated charges. The surface charges absorb X-rays and have higher energy to get rid of the traps on the surface of the material, thereby accelerating their dissipation along the surface. In addition, the charged particles generated by the ionization of the surrounding gas neutralize the surface heteropolar charges, effectively reducing the accumulated surface charge. Due to the insulating gas (such as SF 6 , SF 6 with N 2 Mixed gas) has self-recovery properties, and will restore its insulating properties by itself after the irradiation is over.

[0034] In order to reduce the charge accumulated on the surface of the insulator, the X-ray source is pre-installed outside the GIL pipe, such as figure 1 shown. By adjusting the number, angle and position o...

Embodiment example 2

[0038] After 14 minutes of corona discharge, the surface potential distribution of the insulator before and after X-ray irradiation is as follows: Figure 3a and Figure 3b shown.

[0039] The surface potential distribution of the insulator after irradiation is significantly lower than that before irradiation, further verifying the effectiveness of X-ray irradiation for reducing surface charge accumulation.

Embodiment 3

[0041]When the real-time monitoring method is required to accurately dissipate the charge on the surface of the insulator, it is necessary to use a capacitive electrostatic probe to detect the electrostatic voltage of the insulator. However, in order to improve the spatial resolution of the probe measurement, the existing capacitive electrostatic probe often uses Cylindrical design, the introduction of the probe will distort the initial two-dimensional axisymmetric electric field inside the GIL.

[0042] For this reason Figure 4 and 5 As shown, the present invention uses a new electrostatic probe for electrostatic detection. The new electrostatic probe is composed of three symmetrically distributed fan-shaped copper electrodes, and the electrodes are effectively insulated by epoxy resin. The new probe has a ring structure as a whole, which can effectively reduce the influence of the probe installation on the two-dimensional axisymmetric electric field of the GIL. In additio...

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Abstract

The invention discloses an insulator surface charge rapid dissipation device and method based on X-rays. The method comprises the following steps 1, pre-installing an X-ray source around an insulatorof a gas insulated transmission line; and 2, periodically irradiating the surface of the insulator by adopting X-rays according to operation experience so as to eliminate accumulated charges. According to the invention, the device is flexible in design, and can adjust the radiation quantity, radiance, radiation time and other parameters of X-rays according to the operation voltage of GIL, the sizeof the insulator, the gas type and the surface charge accumulation condition, so that the accumulated surface charge can be reduced as much as possible; the operation is simple, wherein during working, only an X-ray source pre-mounted at the periphery of the GIL needs to be turned on to irradiate the surface of the insulator with accumulated charges for a certain period of time, so that the accumulated surface charges can be reduced; and the cost is low, wherein the existing GIL structure can effectively shield the influence of X-rays on the surrounding environment, so that an additional radiation protection problem is not introduced.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a method and a device for rapidly dissipating charge on the surface of an insulator based on X-rays. Background technique [0002] As a new type of power transmission, gas insulated transmission line (GIL) has the advantages of large transmission capacity, high safety performance, small environmental impact and small footprint, and has broad application prospects. However, there are inevitably insulation defects inside the actual GIL (such as gas-electrode-insulator triple junction, metal particles on the surface of insulators, and metal protrusions on the surface of high-voltage conductors, etc.), and partial discharges must exist during operation. The charged particles generated by partial discharge migrate to the surface of the insulator along the electric field lines, resulting in the accumulation of surface charges. Studies have shown that under extreme conditions, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/00
CPCH02G1/00
Inventor 汪沨梁芳蔚陈赦钟理鹏谭阳红
Owner HUNAN UNIV
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