An on-line detection device for PIM defects in the inner core of a leaky coaxial cable

Abstract

The application discloses a kind of online detection devices of leakage coaxial cable inner core PIM defect, coupling intermediate section outer conductor is arranged between two outer conductor side covers, wherein, the inside of coupling intermediate section outer conductor is provided with coupling ring, outer coaxial outer conductor is provided on the outer wall of coupling intermediate section outer conductor, the outer coaxial inner conductor is provided in the outer coaxial outer conductor, wherein, one end of coupling ring is connected with the inner wall of coupling intermediate section outer conductor, the other end of coupling ring is inserted into the outer coaxial inner conductor by passing through the first through-hole on the side surface of coupling intermediate section outer conductor, the middle part of coupling ring is opposite to the inner conductor to be measured, the inner conductor to be measured passes through the outer conductor side cover aperture on coupling intermediate section outer conductor and outer conductor side cover, and external PIM test equipment is connected with outer coaxial outer conductor and outer coaxial inner conductor, and the device can more accurately detect the PIM defect of coaxial cable inner core.

Description

Technical Field

[0001] This invention relates to an online detection device, specifically an online detection device for defects in the PIM (Polymer Insulation) core of a leaking coaxial cable. Background Technology

[0002] Currently, in known coaxial cables, the difference in size between the inner and outer conductors, especially the significantly smaller diameter of the inner conductor compared to the outer conductor, results in a significantly stronger electric field on the inner conductor compared to the outer conductor. The inner conductor is highly susceptible to surface tensile friction during manufacturing, leading to surface defects such as scratches and fractures. This, combined with the significantly stronger electric field on the inner conductor, makes it more prone to particle impaction (PIM) risk compared to the outer conductor. Current PIM assessments, particularly for coaxial structures, require the use of complete inner and outer conductor structures. This makes it difficult to identify the source of PIM in both conductors during simultaneous testing, especially for the high-risk inner conductor. This hinders accurate PIM detection and consequently prevents guidance for the optimized processing and manufacturing of high-performance, low-PIM cables. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an online detection device for PIM defects in the inner core of a leaky coaxial cable. This device can detect PIM defects in the inner core of a leaky coaxial cable more accurately.

[0004] To achieve the above objectives, the online detection device for PIM defects in the inner core of a leaky coaxial cable according to the present invention includes an external PIM testing device, a coupling ring, and two outer conductor side covers.

[0005] A coupling intermediate section outer conductor is provided between two outer conductor side covers. A coupling ring is provided inside the coupling intermediate section outer conductor, and an external coaxial outer conductor is provided on the outer wall of the coupling intermediate section outer conductor. An external coaxial inner conductor is provided inside the external coaxial outer conductor. One end of the coupling ring is connected to the inner wall of the coupling intermediate section outer conductor, and the other end of the coupling ring passes through a first through hole on the side of the coupling intermediate section outer conductor and is inserted into the external coaxial inner conductor. The middle part of the coupling ring is facing the inner conductor to be tested. The inner conductor to be tested passes through the coupling intermediate section outer conductor and the gap of the outer conductor side cover on the outer conductor side cover. There are gaps between the inner conductor to be tested and the inner wall of the coupling intermediate section outer conductor, the inner wall of the outer conductor side cover gap, and the coupling ring. An external PIM test device is connected to the external coaxial outer conductor and the external coaxial inner conductor.

[0006] The external PIM test equipment is connected to the external coaxial outer conductor and the external coaxial inner conductor via a coaxial port.

[0007] The outer coaxial conductor and the inner coaxial conductor are arranged coaxially.

[0008] The external coaxial conductor is connected to the coupling intermediate section conductor via the first high-voltage flange.

[0009] The outer conductor side cover is connected to the coupling intermediate section outer conductor via a second high-pressure flange.

[0010] The coupling ring is welded to the external coaxial inner conductor.

[0011] The coupling ring is welded to the outer conductor of the coupling middle section.

[0012] It also includes external supports for supporting the inner conductor under test.

[0013] There are two coupling rings, which are separated by a partition disposed inside the outer conductor of the coupling intermediate section. The partition has a second through hole in the middle for the inner conductor to be tested to pass through. There is a gap between the inside of the through hole and the inner conductor to be tested. There are two outer coaxial inner conductors and two outer coaxial outer conductors. One outer coaxial inner conductor corresponds to one outer coaxial outer conductor and one coupling ring. One coupling ring is connected to the inner wall of the top of the outer conductor of the coupling intermediate section, and the other coupling ring is connected to the inner wall of the bottom of the outer conductor of the intermediate section.

[0014] The present invention has the following beneficial effects:

[0015] The online detection device for PIM defects in the inner core of a leaky coaxial cable described in this invention utilizes a coupling ring, an external coaxial outer conductor, and an external coaxial inner conductor to guide the PIM defect of the inner conductor under test to an external PIM testing device. The PIM value detected by the external PIM testing device is used to determine whether a defect exists on the inner conductor under test. This avoids the problem of not being able to determine the source of PIM in the inner and outer conductors when PIM testing is conducted simultaneously with the inner and outer conductors, thereby improving the accuracy of PIM defect detection in the inner core of the coaxial cable. The device has a simple structure, is easy to operate, and is highly practical. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention;

[0017] Figure 2 This is a diagram showing the position of the inner conductor 7 to be tested in this invention;

[0018] Figure 3 This is a schematic diagram illustrating the effects of the present invention;

[0019] Figure 4 This is a structural diagram of the present invention.

[0020] Among them, 1 is the outer coaxial conductor, 2 is the coupling middle section outer conductor, 3 is the coupling ring, 4 is the outer conductor side cover hole, 5 is the outer conductor side cover, 6 is the outer coaxial inner conductor, and 7 is the inner conductor to be tested. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0022] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0023] refer to Figures 1 to 4 The online detection device for PIM defects in the inner core of coaxial cable according to the present invention includes an external PIM testing device, a coupling ring 3 and two outer conductor side covers 5;

[0024] A coupling intermediate section outer conductor 2 is provided between two outer conductor side covers 5. A coupling ring 3 is provided inside the coupling intermediate section outer conductor 2. An outer coaxial outer conductor 1 is provided on the outer wall of the coupling intermediate section outer conductor 2. An outer coaxial inner conductor 6 is provided inside the outer coaxial outer conductor 1. One end of the coupling ring 3 is connected to the inner wall of the coupling intermediate section outer conductor 2, and the other end of the coupling ring 3 is inserted into the outer coaxial inner conductor 6 through the first through hole on the side of the coupling intermediate section outer conductor 2. The middle part of the coupling ring 3 is facing the inner conductor 7 to be tested. The inner conductor 7 to be tested passes through the coupling intermediate section outer conductor 2 and the outer conductor side cover hole 4 on the outer conductor side cover 5. There are gaps between the inner conductor 7 to be tested and the inner wall of the coupling intermediate section outer conductor 2, the inner wall of the outer conductor side cover hole 4, and the coupling ring 3. An external PIM test device is connected to the outer coaxial outer conductor 1 and the outer coaxial inner conductor 6 through a coaxial port.

[0025] Specifically, the outer coaxial conductor 1 and the inner coaxial conductor 6 are arranged coaxially, and the outer coaxial conductor 1 and the coupling intermediate section outer conductor 2 are connected through a first high-voltage flange; the outer conductor side cover 5 and the coupling intermediate section outer conductor 2 are connected through a second high-voltage flange; and the coupling ring 3 is welded to the inner coaxial conductor 6 and the coupling ring 3 is welded to the coupling intermediate section outer conductor 2.

[0026] The present invention also includes an external support for supporting the inner conductor 7 under test, wherein the external support is located outside the outer conductor side cover 5. Through the external support, air coupling or physical isolation of the medium is used to prevent the inner conductor 7 under test from contacting the inner wall of the coupling intermediate section outer conductor 2, the inner wall of the outer conductor side cover hole 4, and the coupling ring 3.

[0027] It should also be noted that there are two coupling rings 3. The two coupling rings 3 are separated by a partition disposed inside the outer conductor 2 of the coupling intermediate section. The middle part of the partition is provided with a second through hole for the inner conductor 7 to be tested to pass through. There is a gap between the inside of the through hole and the inner conductor 7 to be tested. At the same time, there are two outer coaxial inner conductors 6 and two outer coaxial outer conductors 1. One outer coaxial inner conductor 6 corresponds to one outer coaxial outer conductor 1 and one coupling ring 3. One coupling ring 3 is connected to the inner wall of the top of the outer conductor 2 of the coupling intermediate section, and the other coupling ring 3 is connected to the inner wall of the bottom of the outer conductor 2 of the intermediate section.

[0028] The working principle of this invention is as follows:

[0029] During operation, the coupling loop 3 enables the coupling electrical connection between the inner conductor 7 under test and the external coaxial inner conductor 6. The direction of the current induced by the coupling loop 3 is opposite to the direction of the current induced on the surface of the inner conductor 7 under test.

[0030] By moving the inner conductor 7 under test and observing the PIM value measured by the external PIM testing equipment, when there is a defect on the surface of the inner conductor 7 under test, the PIM value detected by the external PIM testing equipment will increase sharply, thereby determining the location of the defect on the surface of the inner conductor 7 under test.

[0031] In addition, during movement, the inner conductor 7 under test does not contact the inner wall of the outer conductor 2 in the coupling middle section, the inner wall of the outer conductor side cover hole 4, and the coupling ring 3. The movement of the inner conductor 7 under test in and out does not change the impedance state of the device. At the same time, the length of the outer conductor 2 in the coupling middle section can be modified according to requirements to achieve PIM detection with different sensitivities.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An online detection device for leaking PIM defects in the inner core of a coaxial cable, characterized in that, Includes external PIM testing equipment, coupling ring (3) and two outer conductor side covers (5); A coupling intermediate section outer conductor (2) is provided between the two outer conductor side covers (5). A coupling ring (3) is provided inside the coupling intermediate section outer conductor (2). An external coaxial outer conductor (1) is provided on the outer wall of the coupling intermediate section outer conductor (2). An external coaxial inner conductor (6) is provided inside the external coaxial outer conductor (1). One end of the coupling ring (3) is connected to the inner wall of the coupling intermediate section outer conductor (2), and the other end of the coupling ring (3) passes through the first [missing information] on the side of the coupling intermediate section outer conductor (2). A through hole is inserted into the outer coaxial inner conductor (6), and the middle part of the coupling ring (3) is facing the inner conductor (7) to be tested. The inner conductor (7) to be tested passes through the coupling middle section outer conductor (2) and the outer conductor side cover hole (4) on the outer conductor side cover (5). There is a gap between the inner conductor (7) to be tested and the inner wall of the coupling middle section outer conductor (2), the inner wall of the outer conductor side cover hole (4) and the coupling ring (3). The external PIM test equipment is connected to the external coaxial outer conductor (1) and the external coaxial inner conductor (6). During operation, the coupling loop (3) enables the coupling electrical connection between the inner conductor (7) under test and the external coaxial inner conductor (6). The direction of the current induced by the coupling loop (3) is opposite to the direction of the current induced on the surface of the inner conductor (7) under test. By moving the inner conductor (7) to be tested and observing the PIM value measured by the external PIM testing equipment, when there is a defect on the surface of the inner conductor (7), the PIM value detected by the external PIM testing equipment will increase sharply, thereby determining the location of the defect on the surface of the inner conductor (7). During movement, the inner conductor (7) under test does not contact the inner wall of the outer conductor (2) in the coupling middle section, the inner wall of the outer conductor side cover hole (4), and the coupling ring (3). The movement of the inner conductor (7) under test in and out does not change the impedance state of the device.

2. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The external PIM test equipment is connected to the external coaxial outer conductor (1) and the external coaxial inner conductor (6) through a coaxial port.

3. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The external coaxial outer conductor (1) and the external coaxial inner conductor (6) are arranged coaxially.

4. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The external coaxial conductor (1) and the coupling intermediate section conductor (2) are connected through the first high-voltage flange.

5. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The outer conductor side cover (5) is connected to the coupling middle section outer conductor (2) via a second high-pressure flange.

6. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The coupling ring (3) is welded to the external coaxial inner conductor (6).

7. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, The coupling ring (3) is welded to the outer conductor (2) of the coupling middle section.

8. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, It also includes an external support for supporting the inner conductor (7) under test.

9. The online detection device for PIM defects in the inner core of a leaky coaxial cable according to claim 1, characterized in that, There are two coupling rings (3). The two coupling rings (3) are separated by a partition set in the middle section of the coupling outer conductor (2). The middle part of the partition is provided with a second through hole for the inner conductor (7) to be tested to pass through. There is a gap between the inside of the through hole and the inner conductor (7) to be tested. At the same time, there are two outer coaxial inner conductors (6) and two outer coaxial outer conductors (1). One outer coaxial inner conductor (6) corresponds to one outer coaxial outer conductor (1) and one coupling ring (3). One coupling ring (3) is connected to the inner wall of the top of the middle section outer conductor (2), and the other coupling ring (3) is connected to the inner wall of the bottom of the middle section outer conductor.

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