CN113015421A - Electromagnetic shielding device based on overhead line X-ray detection and verification method - Google Patents
Electromagnetic shielding device based on overhead line X-ray detection and verification method Download PDFInfo
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- CN113015421A CN113015421A CN202110094623.XA CN202110094623A CN113015421A CN 113015421 A CN113015421 A CN 113015421A CN 202110094623 A CN202110094623 A CN 202110094623A CN 113015421 A CN113015421 A CN 113015421A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
The invention discloses an electromagnetic shielding device based on overhead line X-ray detection, which is used for protecting an X-ray detector and comprises a box body made of a metal plate, wherein the box body is provided with a first through hole according to the Faraday cage principle and used for preventing the frequency from being smaller than a threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body, and the box body is also provided with a second through hole for preventing the frequency from being less than the threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body and is used for transmitting a communication signal of the X-ray detector with the frequency f. The invention can prevent the ultrahigh frequency electromagnetic wave from entering the box body, prevent the X-ray detector from being damaged and simultaneously not influence the transmission of communication signals. Also discloses an electromagnetic shielding verification method of the electromagnetic shielding device based on the X-ray detection of the overhead line, which can be used before useAnd then the electromagnetic shielding effect is verified.
Description
Technical Field
The invention belongs to the field of electric power detection equipment, and particularly relates to an electromagnetic shielding device based on overhead line X-ray detection and a verification method.
Background
The overhead line is the important power equipment who realizes the long-distance transport of electric energy, in order to prevent that strong wind or snow storm from producing the destruction to the overhead line, need install the preformed armor rod gold utensil additional to overhead line strain clamp during the erections, guarantees the good stability of overhead line. However, the crimping construction of the strain clamp belongs to hidden engineering, the internal crimping defects and crimping positioning defects of the clamp cannot be detected normally, the defects cannot be found in time through detection in advance, and the strain clamp can only be detected and replaced periodically and destructively or until the wire breakage accident of the clamp part occurs, so that great economic loss and potential safety hazards are caused. In recent years, nondestructive testing technology is rapidly developed, wherein the X-ray digital imaging testing technology plays an important role in detecting the defects of the transmission line hardware and can directly detect whether the defects exist under the condition of no damage. However, when the X-ray detector is applied to nondestructive testing of an overhead line at present, a large problem exists, that is, due to the fact that the overhead line itself transmits high voltage electricity, when the X-ray detector enters and exits a high-voltage electric field, a protection tool sleeved outside the X-ray detector can generate air breakdown and arc discharge with a cable, ultrahigh frequency local pulses can be generated, the ultrahigh frequency local pulses contain a large number of ultrahigh frequency electromagnetic waves with different frequencies, wherein the ultrahigh frequency electromagnetic waves with the frequency below a threshold frequency possibly cause damage of the X-ray detector, and meanwhile, interference can be caused to a communication module in the X-ray detector, and detection accuracy is affected.
Disclosure of Invention
The invention aims to provide an electromagnetic shielding device based on overhead line X-ray detection and a verification method, which can effectively solve the problem that in the prior art, ultrahigh frequency electromagnetic waves generated in the process of an X-ray detector entering and exiting a high-voltage electric field interfere with the X-ray detector.
In order to solve the technical problems, the invention adopts the following technical scheme: an electromagnetic shielding device based on overhead line X-ray detection for protecting an X-ray detector comprises a box body made of a metal plate, wherein a first through hole is formed in the box body according to the Faraday cage principle for preventing the frequency from being smaller than a threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body, and the box body is also provided with a second through hole for preventing the frequency from being less than the threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body and is used for transmitting a communication signal of the X-ray detector with the frequency f.
Preferably, the diameter of the first through-hole
Diameter of the second through hole
Where c is the speed of light.
Preferably, the aperture of the first through hole is 1cm, and the aperture of the second through hole is 7.4 cm. And an optimal value is selected, so that a better electromagnetic shielding effect can be achieved.
Preferably, the box body is further provided with a third through hole for pressing the switch of the X-ray detector, and the aperture of the third through hole
Where c is the speed of light. A third through hole is provided and the aperture thereof is defined so that the third through hole can prevent the frequency from being less than the threshold frequency fminThe electromagnetic wave enters the box body and simultaneouslyThe third through hole can extend into the box body to press a switch of the X-ray detector, so that the starting and stopping of the X-ray detector are controlled.
Preferably, the ray outlet of the X-ray detector is aligned with an area of a side plate on one side of the box body, the area is an irradiation area, and the irradiation area is not provided with a through hole. The influence of the through hole on the detection imaging of the X-ray detector is avoided.
Preferably, a mounting seat for fixedly mounting the X-ray detector is arranged in the box body, and an indicating sign is arranged on the mounting seat and used for guiding a ray outlet of the X-ray detector to be aligned with the radiation area during mounting. This facilitates accurate alignment of the radiation exit with the radiation field during installation.
Preferably, the electromagnetic radiation receiver is arranged in the middle of the bottom plate in the box body and used for testing the electromagnetic radiation value entering the interior from the outside of the box body. Through setting up electromagnetic radiation receiver, can play the verification effect to this electromagnetic shield device shielding effect.
Preferably, the test frequency of the electromagnetic radiation receiver is 300 MHz-2 GHz.
In order to solve the technical problems, the invention also adopts the following technical scheme: the electromagnetic shielding verification method based on the X-ray detection of the overhead line comprises the following steps:
s1: before the electromagnetic shielding device is matched with an X-ray detector to carry out nondestructive testing on the overhead line, firstly, electromagnetic radiation signals with different frequencies are released towards the box body outside the box body;
s2: and checking the electromagnetic radiation value received by the electromagnetic radiation receiver in the box body, and judging whether the electromagnetic shielding device has an effective electromagnetic shielding effect or not according to the electromagnetic radiation value.
The electromagnetic shielding effect is verified before the electromagnetic shielding device is used, so that the electromagnetic shielding device can play a required shielding effect.
Preferably, the following steps are further included after step S2:
s3: after the electromagnetic shielding device is used for being matched with an X-ray detector to carry out nondestructive testing on the overhead line, the electromagnetic radiation value received by the electromagnetic radiation receiver in the box body is checked, and whether the electromagnetic shielding device has an effective electromagnetic shielding effect or not is judged according to the electromagnetic radiation value. Therefore, whether the shielding effect can be obtained or not can be verified before use, whether the expected electromagnetic shielding effect is really obtained or not can be verified after use, the quality of the device is convenient to improve continuously, and the electromagnetic shielding effect is improved.
Compared with the prior art, the invention has the following beneficial effects: a box body is made of a metal plate, and a first through hole is formed in the box body by utilizing the Faraday cage principle, so that the frequency can be prevented from being smaller than the threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body, so that the X-ray detector placed in the box body is protected and cannot be damaged. The box body is also provided with a second through hole for preventing the frequency from being less than the threshold frequency fminWhen the ultrahigh frequency electromagnetic wave enters the box body, normal transmission of a communication signal of the X-ray detector with the frequency f can be ensured, and the communication module is not influenced by interference. The electromagnetic radiation device can protect the X-ray detector from being damaged, and meanwhile, the detection accuracy of the X-ray detector is effectively improved.
Drawings
Fig. 1 is a first schematic diagram of an electromagnetic shielding device based on overhead line X-ray detection provided by an embodiment;
fig. 2 is a schematic diagram two of an electromagnetic shielding apparatus based on overhead line X-ray detection according to the embodiment.
Wherein: 1. the box body, 11, a first through hole, 12, a second through hole, 13, a third through hole, 14, an emission area, 15, a box door and 16, a reinforcing frame.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example (b): as shown in fig. 1 and 2, the electromagnetic shielding device for overhead line X-ray detection according to the present embodiment is used for protecting an X-ray detector, and includes a box body 1 made of a metal plate, wherein the box body 1 is provided with a first through hole 11 according to the faraday cage principle for preventing the frequency from being smaller than a threshold frequency fminThe electromagnetic wave enters the box body 1, and the box body 1 is also provided with a second through hole 12 for preventing the frequency from being less than the threshold frequency fminThe electromagnetic wave enters the box body 1 and is used for transmitting a communication signal of the X-ray detector with the frequency f. The electromagnetic shielding device is characterized in that a box body 1 is made of a metal plate, and a first through hole 11 is formed in the box body 1 by utilizing the Faraday cage principle, so that the frequency can be prevented from being smaller than a threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body 1, so that the X-ray detector arranged in the box body 1 is protected and is not damaged. The box body 1 is also provided with a second through hole 12 for preventing the frequency from being less than the threshold frequency fminWhen the ultrahigh frequency electromagnetic wave enters the box body 1, the normal transmission of the communication signal of the X-ray detector with the frequency f can be ensured, so that the communication module is not influenced by interference. The electromagnetic radiation device can protect the X-ray detector from being damaged, and meanwhile, the detection accuracy of the X-ray detector is effectively improved. In order to ensure the stability of the box body 1, a reinforcing frame body is additionally arranged outside the box body 1, a reinforcing frame 16 can be made of aluminum alloy materials, and meanwhile, a box door 15 capable of being opened and closed is arranged at one end face of the box body 1, so that the box body 1 can be conveniently taken and placedSuch as an X-ray detector. It should be noted that the box of the electromagnetic shielding device provided by the present invention may have a box structure as shown in fig. 1 and fig. 2 in this embodiment, or may have a cubic or cylindrical structure, and is not limited to the box structure provided in fig. 1 and fig. 2 in this embodiment.
Wherein the aperture of the first through hole
Diameter of the second through hole
And c is the speed of light. The principle of this formula is illustrated below: according to the relationship between wavelength lambda, frequency F and wave velocity u
Since the transmission speed of the electromagnetic wave is the same as the speed of light, the speed of light c can be substituted into the formula instead of u. According to maxwell's equation of the electromagnetic wave propagating in the waveguide, when the wavelength is longer than the cut-off wavelength of the waveguide, the electromagnetic wave will not continue to propagate forward, and the cut-off wavelength is equal to twice the maximum aperture, that is, when the half wavelength of the electromagnetic wave is longer than the aperture of the through hole, the electromagnetic wave will be shielded, and it can be understood that each through hole is a high pass filter, and only the electromagnetic wave with the wavelength shorter than the cut-off wavelength passes through. According to experimental research, the electromagnetic radiation energy of the electromagnetic wave with the frequency higher than 1GHz in the ultrahigh frequency local pulse is attenuated quickly, and further, the electromagnetic radiation energy of the electromagnetic wave with the frequency up to 2GHz is almost instantaneously attenuated, so that the influence on the X-ray detector can be ignored, and therefore, according to actual requirements, the electromagnetic shielding device only needs to be used for the electromagnetic wave with the frequency lower than the threshold frequency fminThe ultrahigh frequency electromagnetic wave is shielded, so that the X-ray detector is not influenced by interference. Therefore, the diameter of the first through-hole 11 in the present embodiment
And will threshold the frequency fminSet to 2GHz, the value f and f of the incoming velocity of light are substitutedminCalculated at 2GHzD in the present example1<7.5cm, d is preferred1The aperture values of 1cm, 2cm, 3cm, 4cm, etc. can be taken, the smaller the aperture of the first through hole 11 is, the wider the range of the electromagnetic wave band that can be blocked is, the better the shielding effect on the electromagnetic radiation is, in this embodiment, d1＝1cm。
In this embodiment, the aperture of the second through hole 12 is not only less than 7.5cm to ensure sufficient shielding effect on the uhf electromagnetic wave, but also to ensure that the communication signal of the X-ray detector cannot be shielded, so d2Cannot be too small, therefore
The communication module used by the common X-ray detector in the market has a communication signal frequency of 2.4GHz, and the frequency of the communication module is substituted into f-2.4 GHz, so that 6.25cm in the embodiment is calculated<d2<7.5cm, and specifically, the second through hole 12 is set to 7.4cm in this embodiment.
It is understood that the first through hole 11 may be a circular hole or a rectangular hole, and the second through hole 12 may also be a circular hole or a rectangular hole. When the hole is a round hole, the diameter of the round hole is the aperture, and when the hole is a rectangular hole, the length of the long edge of the rectangular hole is the aperture. In this embodiment, the first through hole 11 is a circular hole, and the second through hole 12 is a rectangular hole.
For conveniently controlling the start and stop of the X-ray detector, in this embodiment, a third through hole 13 for pressing the switch of the X-ray detector is further formed in the box body 1, and the aperture of the third through hole 13
Wherein c is the speed of light, and specifically in this embodiment, the aperture of the third through hole 13 is designed to be identical to the aperture of the second through hole 12, and is 7.4 cm. So that the third through-hole 13 is able to prevent frequencies lower than the threshold frequency fminThe electromagnetic wave enters the box body 1, and simultaneously can extend into the box body 1 through the third through hole 13 to press a switch of the X-ray detector, so that the starting and stopping of the X-ray detector are controlled.
In order to prevent the first through hole 11 and the second through hole 12 from affecting the detection imaging of the X-ray detector, in this embodiment, an emitting area 14 without any through hole is further left on a side plate of the box body 1, and a radiation outlet of the X-ray detector is aligned with the emitting area 14. Furthermore, a mounting seat for fixedly mounting the X-ray detector can be arranged in the box body 1, an indicating mark is directly arranged on the mounting seat, and a ray outlet of the X-ray detector is directly aligned to the radiation area 14 through the guiding mark during mounting, so that mounting errors are avoided.
After the electromagnetic shielding device provided in this embodiment is designed according to theory, in order to verify whether the electromagnetic shielding device in this embodiment has the required electromagnetic shielding effect, an electromagnetic radiation receiver is further disposed at the middle position of the bottom plate in the box 1 in this embodiment, and is used for testing the electromagnetic radiation value entering the inside from the outside of the box 1. Wherein the testing frequency of the electromagnetic radiation receiver is set to be 300 MHz-2 GHz. The specific verification method comprises the following steps:
s1: before the electromagnetic shielding device is matched with an X-ray detector to carry out nondestructive testing on the overhead line, firstly, electromagnetic radiation signals with different frequencies are released towards the box body 1 outside the box body 1;
s2: and checking the electromagnetic radiation value received by the electromagnetic radiation receiver in the box body 1, and judging whether the electromagnetic shielding device has an effective electromagnetic shielding effect or not according to the electromagnetic radiation value.
The electromagnetic shielding effect is verified before the electromagnetic shielding device is used, so that the electromagnetic shielding device can play a required shielding effect.
And, can also check the electromagnetic radiation value that the electromagnetic radiation receiver in the container body 1 receives again after using this electromagnetic shield assembly to cooperate X-ray detector to carry out nondestructive test to the overhead line, judge whether this electromagnetic shield assembly has effectual electromagnetic shielding effect according to this electromagnetic radiation value. Therefore, whether the shielding effect can be obtained or not can be verified before use, whether the expected electromagnetic shielding effect is really obtained or not can be verified after use, the quality of the device is convenient to improve continuously, and the electromagnetic shielding effect is improved.
The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (10)
1. Electromagnetic shield device based on overhead line X ray detects for protect X ray detector, its characterized in that: the device comprises a box body (1) made of a metal plate, wherein a first through hole (11) is formed in the box body (1) according to the Faraday cage principle and used for preventing the frequency from being smaller than a threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body (1), and a second through hole (12) is further formed in the box body (1) and used for preventing the frequency from being smaller than the threshold frequency fminThe ultrahigh frequency electromagnetic wave enters the box body (1) and is used for transmitting a communication signal of the X-ray detector with the frequency f.
2. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 1, wherein: the diameter of the first through hole (11)
The diameter of the second through hole (12)
Where c is the speed of light.
3. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 2, wherein: the aperture of the first through hole (11) is 1cm, and the aperture of the second through hole (12) is 7.4 cm.
4. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 2, wherein: a third through hole (13) used for pressing an X-ray detector switch is further formed in the box body (1), and the aperture of the third through hole (13)
Where c is the speed of light.
5. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 1, wherein: the ray outlet of the X-ray detector is aligned to an area of a side plate on one side of the box body (1), the area is a radiation area (14), and the radiation area (14) is not provided with a through hole.
6. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 5, wherein: the X-ray detector is characterized in that a mounting seat for fixedly mounting the X-ray detector is arranged in the box body (1), and an indicating sign is arranged on the mounting seat and used for guiding a ray outlet of the X-ray detector to be aligned to the radiation area (14) during mounting.
7. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 1, wherein: and an electromagnetic radiation receiver is arranged in the middle of the bottom plate in the box body (1) and used for testing the electromagnetic radiation value entering the inside from the outside of the box body (1).
8. The electromagnetic shielding apparatus for overhead line X-ray based inspection according to claim 7, wherein: the test frequency of the electromagnetic radiation receiver is 300 MHz-2 GHz.
9. Electromagnetic shielding verification method based on an electromagnetic shielding device based on overhead line X-ray detection as claimed in claim 7 or 8, characterized by comprising the following steps:
s1: before the electromagnetic shielding device is matched with an X-ray detector to carry out nondestructive testing on the overhead line, firstly, electromagnetic radiation signals with different frequencies are released towards the box body (1) from the outside of the box body (1);
s2: and checking the electromagnetic radiation value received by the electromagnetic radiation receiver in the box body (1), and judging whether the electromagnetic shielding device has an effective electromagnetic shielding effect or not according to the electromagnetic radiation value.
10. The method for verifying electromagnetic shielding based on overhead line X-ray inspection as claimed in claim 9, further comprising the following steps after the step S2:
s3: after the electromagnetic shielding device is used for being matched with an X-ray detector to carry out nondestructive testing on an overhead line, an electromagnetic radiation value received by an electromagnetic radiation receiver in the box body (1) is checked, and whether the electromagnetic shielding device has an effective electromagnetic shielding effect or not is judged according to the electromagnetic radiation value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110094623.XA CN113015421A (en) | 2021-01-25 | 2021-01-25 | Electromagnetic shielding device based on overhead line X-ray detection and verification method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110094623.XA CN113015421A (en) | 2021-01-25 | 2021-01-25 | Electromagnetic shielding device based on overhead line X-ray detection and verification method |
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| CN113015421A true CN113015421A (en) | 2021-06-22 |
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| CN203872502U (en) * | 2014-03-19 | 2014-10-08 | 北京中欧美经济技术发展中心 | Electromagnetic shielding device |
| CN111929510A (en) * | 2020-08-21 | 2020-11-13 | 国网江苏省电力有限公司盐城供电分公司 | Power equipment electromagnetic radiation detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5592002A (en) * | 1979-01-05 | 1980-07-12 | Kokusai Denshin Denwa Co Ltd <Kdd> | Antenna unit |
| US5049741A (en) * | 1989-05-02 | 1991-09-17 | National Space Development Agency Of Japan | Electromagnetic wave shielding system for optical sensor having an aperture |
| US20070297160A1 (en) * | 2004-12-07 | 2007-12-27 | Cochrane Paul D | Configurations for EMI Shielding Enclosures |
| CN2935732Y (en) * | 2006-07-03 | 2007-08-15 | 保定天威恒通电气有限公司 | Cabinet baffle with anti-electromagnetic radiation function |
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