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A method for determining the sensitivity of corona discharge ultraviolet detection of high-voltage electrical equipment

A high-voltage electrical equipment and detection sensitivity technology, applied in the direction of testing dielectric strength, etc., can solve the problems of unreliable detection conclusions, difficult operation, low reliability, etc., and achieve the dynamic and vivid ultraviolet image at the discharge point, with little difficulty in operation , high reliability effect

Active Publication Date: 2020-01-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Since the corona discharge intensity of high-voltage equipment is greatly affected by factors such as air pressure, altitude, temperature, humidity, and rainy and snowy weather, the discharge image and photon number value will change with the changes of the above factors, and only rely on the sensitivity developed based on the experience of the testing personnel It is inaccurate to judge the discharge intensity by the standard
For example: conduct on-site detection of a certain discharge point, and formulate sensitivity standards based on the experience of the inspectors: gain 25%, threshold 40%, photon number 50; in sunny and dry weather, the measured photon number is about 40, but in cloudy days with humidity The number of photons measured under relatively large weather can reach 300, so due to weather factors, two completely different results can be obtained for the detection of the same discharge point, and the reliability of the detection conclusion cannot be guaranteed
[0008] In the process of realizing the present invention, the inventor found that there are at least defects such as high operational difficulty, poor accuracy and low reliability in the prior art

Method used

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  • A method for determining the sensitivity of corona discharge ultraviolet detection of high-voltage electrical equipment
  • A method for determining the sensitivity of corona discharge ultraviolet detection of high-voltage electrical equipment
  • A method for determining the sensitivity of corona discharge ultraviolet detection of high-voltage electrical equipment

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Effect test

example 1

[0062] See Table 2, UV detection of high voltage equipment in 750kV substation in sunny weather.

[0063] Table 2: Ultraviolet detection sensitivity parameters of high voltage equipment

[0064]

[0065]

[0066] Among them, X1 = 35, ΔX = 5, Xn = 40, 1 abnormal discharge was found after inspection, which was confirmed to be caused by the iron wire left by mistake during equipment installation.

example 2

[0068] See Table 3, carry out ultraviolet detection on high-voltage equipment of 750kV substation on cloudy days.

[0069] Table 3: Ultraviolet detection sensitivity parameters of high voltage equipment

[0070]

[0071] Among them, X1 = 35, ΔX = 15, Xn = 50, 2 abnormal discharges were found after testing, which was proved to be caused by the too close distance between the drainage line and the busbar.

example 3

[0073] See Table 4, after the rain, carry out ultraviolet detection on the high-voltage equipment of the 750kV substation.

[0074] Table 4: Ultraviolet detection sensitivity parameters of high voltage equipment

[0075]

[0076] Among them, X1 = 35, ΔX = 50, Xn = 85, 1 abnormal discharge was found after testing, which was confirmed to be caused by cracking of the wire sheath.

[0077] In summary, the method for determining the sensitivity of the ultraviolet detection of high-voltage electrical equipment corona discharge in the above-mentioned embodiments of the present invention improves the design of the structure of the electronic ignition gun, and makes the discharge form by increasing the distance between the discharge electrodes and changing the shape of the electrodes. Changes have been made to achieve a simple and safe simulation of corona discharge; according to the on-site simulation of this device, the instrument parameters (including gain, threshold, focal len...

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Abstract

The invention discloses a method for determining corona discharge ultraviolet detection sensitivity of high-voltage electrical equipment. The method mainly comprises the step of utilizing an electronic ignition gun to simulate corona discharge and formulating a detection sensitivity standard, the step of improving the electronic ignition gun, and the step of carrying out the test through the improved electronic ignition gun and formulating the detection sensitivity. The method for determining corona discharge ultraviolet detection sensitivity of the high-voltage electrical equipment can overcome the defects that in the prior art, operation difficulty is large, accuracy is poor and reliability is low, and the method for determining corona discharge ultraviolet detection sensitivity of the high-voltage electrical equipment has the advantages of being low in operation difficulty, high in accuracy and high in reliability.

Description

technical field [0001] The invention relates to the technical field of detection of high-voltage electrical equipment, in particular to a method for determining the sensitivity of ultraviolet detection of corona discharge of high-voltage electrical equipment. Background technique [0002] With the sustained and rapid development of the national economy, the scale of the power grid has expanded rapidly. At present, my country ranks among the top in the world both in terms of installed capacity and annual power generation. As an important part of power grid equipment, high-voltage electrical equipment is directly related to the safety and stability of the power grid. According to statistics, lightning accidents rank first among all high-voltage electrical equipment accidents, followed by insulation accidents. Insulation accidents generally occur in large areas and at multiple points, and there will be cascading effects in the surrounding area of ​​dozens or even hundreds of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 高健苗兴张昕李军袁芳王斌赵明忠秦睿李玉鹏孙小平杨占君杨景建白涛席家富伍小慧
Owner STATE GRID CORP OF CHINA